Connect with us

Economy & Market

Revival of small scale cement manufacturing

Published

on

Shares

The availability of most of the AFR is limited or scattered which may not be economically viable for use in most of the large cement plants because of logistics, quantity, preparation and technical issues, says Dr KN Bhattacharjee.

The availability of most of the AFR is limited or scattered, which may not be economically viable for use in most of the large cement plants because of logistics, quantity, preparation and technical issues. This is a great roadblock for the effective use of AFR. However if an industry can find means to utilise its own by-product or waste in its own premises or nearby then it will be a win- win situation for all. Cement manufacturing process is a very appropriate process to recycle many industrial and agricultural wastes. The black meal process of vertical shaft kiln technology is a proven technology in China and India and can serve as a very good outlet for consuming AFR in the vicinity of industries generating the waste in small quantities.

This will also help in reducing environmental pollution. The author has carried out numerous plant scale trials with various industrial and agricultural wastes in VSK plants in India with reasonable success and feels that it may be worthwhile to go backward technology-wise to improve India’s usage of AFR. With the recognition of performance-based cements in most of the standards of world, composite cements are to gain ground and many alternate materials mainly industrial wastes can find profitable use again in small-sized cement plants.

The vertical shaft kiln (VSK) technology is an old technology of Portland Cement manufacture and even the modern versions have almost phased out from India mainly because of economics of scale and taxation issues. In China, still 30 per cent of its cement production comes from shaft kiln plants. The VSK process technology is still a workable proposition for use of wastes available in limited quantities. Also by virtue of the simple process a plethora of process issues associated with modern pre-heater, pre-calciner rotary kiln system are eradicated while using AFR. Plant scale trials with many wastes have shown improvement in VSK clinker quality and better productivity from the kilns. Also it is possible to add many wastes in small quantities directly to VSK clinker to produce high performing composite cements. Although the plan sounds to be reverse engineering but sometimes an old concept can regain its past glory due to changing national needs and environmental issues.

The modern vertical shaft kiln technology is technically sound and institutes like National Council of Cement and Building Materials (NCCBM) and the then Regional Research Laboratory (RRL), Jorhat had done a commendable work in modernising the technology in India. Also the village-based Saboo technology created a stir in India in the 80s when they brought cement manufacturing under the umbrella of small scale industry. During that period, the objective was to increase production as India was cement deficit and VSK technology was a partial answer to quickly bridge the gap between demand and supply. In the hilly terrain of North East, it is still a viable proposition to use scattered small limestone deposits in the midst of logistical challenges.

The advantages and disadvantages of black meal process of vertical shaft kiln technology:

Advantages:

  • Small scale cement production and still suitable in hilly terrains having limestone deposits for local distribution of cement.
  • Energy efficient process: Specific heat consumption is in the range 600 to 650 Kcal/kg of clinker. Specific power consumption is in the range 0f 60 to 70 Kwh/tonne OPC although authentic figures are not available. Since drying, pre-heating, calcining, burning and cooling are integrated in the same vessel, heat losses due to convection and radiation is much reduced.
  • Porous VSK clinker is much easier to grind thus cement grinding power requirement is less.
  • Very low refractory consumption as kiln is stationery and low abrasion as material flow is vertically downward with slow speed.
  • Vast scope of using AFR available in smaller quantities is the major advantage. Some alternate waste materials can act as flux or mineraliser. Mineralising ions can increase the rate of reaction in burning zone leading to complete burning in burning zone.
  • Thus the technology offers avenue not only in the use of wastes but also utilise the waste in improving burnability by stabilising phases at lower temperatures.
  • recirculation of obnoxious gases and materials which ensures smooth operation and higher productivity.
  • Due a constant bed of wet green nodules above the calcining zone the green nodules bed acts as an effective filter to arrest all dust particles. No additional gas cleaning device is required.
  • Since fuel is inter-ground with raw materials elaborate arrangement of fuel preparation and firing is eliminated
  • Very effective and controlled flow of material through flat grate using variable frequency drive (VFD). This helps to position the burning zone constantly at the same level.
  • Relatively simple machines to operate and maintain.
  • Gestation period of starting a new plant is very low.
  • No highly skilled manpower is required and local folk/plant staff can be easily trained for operations.
  • Possible to manufacture a variety of clinkers and thereafter produce various kinds of low cost Portland cements.
  • Very little chance of cold air in-leakages. Diversion of combustion air during clinker discharge has been ably dealt by either triple air locking arrangement or material block tube in the modern VSKs.
  • Since each nodule has its independent fuel system significantly higher temperatures are not achieved leading to no issues of NOx.

Disadvantages:

  • Viability can be at stake due to taxation policies and lower scale of operation. However if Government gives tax rebates on use of AFR the plants can be viable. Also it is possible to reduce cost of production by using low cost or free of cost non- conventional materials and waste fuels available locally. Maybe the savings can be shared with customers.
  • Quality issues: Many believe that VSK clinker cannot be at par with modern rotary plant clinker. In this respect a few conflicting issues are prevalent. It is true that using the same raw materials and fuel the modern rotary clinker will be better performing especially the later age compressive strengths and soundness of cements produced. However the soft burnt nature of the VSK clinker opens up possibilities of addressing customer requirements of good early age compressive strength and early setting in the case of PPC and PSC. The author has found that early age compressive strengths and setting can be matched with modern plants while making PPC with a maximum of 30 per cent fly ash absorption. The Black meal process is capable of producing sound clinkers with less than 1.5 per cent free lime and 45 per cent C3S component. The author’s experience in few VSK plants in Jodhpur-Rajasthan region supports this viewpoint. Experiences with various limestone in Northern India and Bhutan reveals that the technology cannot tolerate high magnesia limestone primarily due to the absence of rapid cooling arrangement but adding certain industrial wastes with mineralising minor constituents gives amazing results in reducing or mitigating this deleterious effect.
  • Consistency of clinker: Consistency does get affected if the raw mix is not well homogenised and nodulisation is not controlled. However these can be easily solved by using good homogenisation and blending techniques. Nodulisation can be automated to yield nodules of good strength. In some cases nodule strength can be improved by double nodulisation. Various industrial wastes like bagasse from sugar industry have been found to improve nodule strength together with bonus addition of heat value. Waste oils can be added at this stage to give very good results.
  • Heat difference between the central and peripheral charge especially in the large dia kilns of 100 TPD per day can be a matter of concern in some cases depending of raw materials and fuels used. The 50 tonne/day Saboo shaft kiln design was found to very efficient in this respect. Crust formations were found to be minimal. Dustry clinker due to beta to gamma conversion of C2S is prevalent in few cases but can be eliminated by stabilisation of phases even with the inherent disadvantage of rapid or quench cooling.

Plant scale trials using various alternate materials and fuels:

Use of pond ash, bottom ash and boiler fired rice husk ash in a 50 TPD VSK plant in Kanpur Dehat, Uttar Pradesh: Both bottom and pond ash were procured from Panki Thermal power plant and were used as components of raw mix separately as a source of Silica and Alumina by partial replacement of plastic clay by 15 to 20 per cent. There was drop in free lime from 2.2 per cent to 1.8 per cent and the dust content in clinker reduced drastically. There was increase of 1.5 to 2.0 MPa in 3 days and 3 MPa in 28days compressive strength of 43 grade OPC. The pond and bottom ash had substantial carbon particles (LOI- 15 to 20 per cent) which added some heat value and perhaps the reactivity of the raw mix increased by the presence of some amount of reactive alumino-silicates. Indirect effects noticed was smooth kiln operations with a slight increase of production from the 50 TPD VSK. Pond ash which is generally wet can be added directly during nodulisation if a dosing arrangement is designed to avoid the drying operation. Boiler fired Rice Husk was tried in the same plant which gave very good results in improving clinker quality. The material was black in colour with LOI around 10 per cent indicating unburnt carbon which must have supplemented the heat input. It was possible to add rice husk as it is but plant scale trial was not attempted with the apprehension that the husk fibres may not give a homozenised mix in the existing raw grinding arrangement.
Use of Phosphorus furnace slag, alkali bypass dust and bag house dust from a Calcium Carbide plant: All these materials were tried with a contention to capitalise mineralising effect from the wastes due to some minor constituents or the presence of reactive silica or Alumina. Even granulated blast furnace slag (GBFS) was also tried. Improvements in kiln productivity and quality was noticed of clinker in most of the cases. In VSK operation any measure which goes to ensure completion of the reactions in the short burning zone will definitely go in improving clinker quality and smooth kiln operations. Appropriate raw mix fineness with correct proportioning of waste materials and fuels, homogenisation hold the key to success.
Additions of alternate waste materials with VSK clinker to make composite cements The future of cement making is composite cements. This not will helps to use some industrial or agricultural wastes in the final product but also help to improve performance of cements and reduce the carbon footprint. In many cases it can lead to low cost cements together with better performance.

Significant improvement was observed when 5 per cent bag house dust from a calcium carbide plant was added in a quaternary mix of 60 per cent Granulated Blast Furnace slag (GBFS) and 3 per cent gypsum using VSK clinker. Initial setting time was reduced from 180 minutes to 40 minutes when compared with plain control sample of PSC. There was an improvement of 2 MPa at 3 days and 28 days compressive strength was more or less the same. Quaternary blends using Alkali bypass dust and 60 to 70 per cent GBFS , gypsum and VSK clinker also performed well in terms of faster setting and improvement of early age compressive strength. Similar results were obtained while using brick kiln ash and calcined clay Pozzolana in dosages of 15 to 20 per cent while making PPC mixes using VSK clinker.

Thus VSK clinker can act as a performance enhancer for early setting and early age compressive strength in presence of high dosage GBFS containing PSC cements and fly ash/CCP based Pozzolanic cements. Hydration studies have revealed that the soft burnt VSK clinker releases soft burnt lime at a faster rate in the early ages leading to higher quantity hydration products both with GBFS and Pozzolana.

Conclusion
The author was associated with VSK plants for six years while doing his Ph.D. His doctoral work is mainly associated with hydration studies of composite cements and VSK clinker doped with ions coming from various industrial and agricultural wastes. He feels that the black meal process using modern vertical shaft kiln technology can be a viable proposition to use localised waste materials available in limited quantities. The process simplicity of the Black Meal process opens up immense potential for use of wastes (both agricultural and Industrial) with improved cement performance in many cases. Waste generating plants can have captive VSK plants or sub let this activity to local entrepreneurs. All performance enhancements have been validated by actual hydration studies which is available with the author for anyone who is interested. This has been a part of the author’s doctoral work. The author feels that for India till we incorporate large scale AFR facilities catering to large cement plants the VSK plants can be revived mainly for use of localised AFR as the project cost and gestation period from concept to commissioning is very low.

Acknowledgement
The author is grateful to AKS University administration for allowing to publish this paper.

About the author
Prof (Dr) KN Bhattacharjee
has 37 years experience in the global cement industry. He has worked with all process technologies of cement manufacture and has done considerable work on use of AFR in mini-cement plants. His Ph.D thesis is in applied cement chemistry and his findings helped many mini-cement plants in India to improve their profitability during the late 80s. He has publications in reputed international and national journals like Cement and Concrete Research, ZKG International, Silicate Industrials, Transactions of Indian Ceramic Society, etc. After his retirement in 2016 from Dangote-Africa, he is teaching cement technology to B.Tech students in AKS University, Satna. Dr KNB has worked with ACC in India, two plants in Oman, Lafarge Canada and Dangote, Africa.

Continue Reading
Click to comment

Leave a Reply

Your email address will not be published. Required fields are marked *

Concrete

Indian Railways Plans Green Fly Ash Transport Network

Published

on

By

Shares

Specialised rail logistics will move fly ash from power plants to infrastructure industries.

New Delhi

Indian Railways is planning a large-scale green logistics initiative to transport fly ash from thermal power plants to industries where it can be reused in infrastructure and construction activities.

The initiative was discussed during a review meeting chaired by Union Minister for Railways Ashwini Vaishnaw. Union Ministers of State for Railways V Somanna and Ravneet Singh Bittu were also present.

India generates nearly 340 million tonnes of fly ash every year from thermal power plants. The proposed initiative aims to create an efficient rail-based transport system using specialised containers and dedicated logistics arrangements to move fly ash safely from power plants to end-use industries.

Fly ash is widely used in road construction, cement manufacturing, brick production, concrete, blocks and boards. By improving its movement through the railway network, the initiative is expected to support better utilisation of this industrial by-product while reducing environmental concerns linked to storage and disposal.

The move also aligns with India’s circular economy goals by converting waste from thermal power generation into a useful raw material for the construction and infrastructure sectors. Wider availability of fly ash can help reduce material costs in areas such as bricks and cement, supporting more affordable infrastructure and housing development.

Through this initiative, Indian Railways aims to provide a cleaner, safer and more organised transport solution for fly ash, turning an environmental challenge into an infrastructure resource.

Continue Reading

Concrete

Powering Cement Through Intelligent Motion

Published

on

By

Shares

Gears, drives, and motors have evolved from essential mechanical components into strategic enablers of reliability, efficiency, and sustainability in modern cement plants. ICR explores how advanced motion technologies, predictive maintenance, digitalisation, and intelligent drive systems are helping cement manufacturers reduce downtime, optimise energy use, and build future-ready operations.

As the Indian cement industry prepares for another phase of capacity expansion, the focus is shifting from merely increasing production volumes to improving operational efficiency, reliability, and sustainability. According to industry estimates, India is expected to add nearly 160–170 million tonnes of cement capacity between FY26 and FY28, driven by infrastructure investments, urbanisation, and housing demand. In this environment, gears, drives, and motors have emerged as critical enablers of productivity, forming the backbone of every major process from raw material extraction and grinding to clinker production and cement dispatch.
Motors alone account for nearly 60 per cent to 70 per cent of industrial electricity consumption globally, according to the International Energy Agency (IEA), while rotating equipment failures remain among the leading causes of unplanned downtime across heavy industries. In cement plants, where equipment operates under high loads, extreme dust conditions, elevated temperatures, and continuous-duty cycles, the performance of gears, drives, and motors directly influences energy consumption, maintenance costs, plant availability, and overall profitability. As digitalisation and Industry
4.0 technologies gain momentum, these systems are evolving from passive mechanical components into intelligent assets capable of delivering real-time operational insights.

Why gears, drives, and motors are the backbone of cement plant operations
Every major process in a cement plant depends on the seamless operation of gears, drives, and motors. Raw mills, vertical roller mills, crushers, kiln drives, conveyor systems, fans, and clinker coolers all rely on rotating equipment to maintain continuous production. A failure in any one of these systems can disrupt entire process chains, highlighting their strategic importance.
Modern cement plants process thousands of tonnes of material daily, requiring equipment capable of transmitting enormous torque while maintaining precision and reliability. Kiln drives and grinding systems, in particular, operate under some of the highest mechanical loads found in industrial manufacturing. The ability of gears and motors to withstand these conditions directly impacts plant throughput and production stability.
Satish Maheshwari, Chief Manufacturing Officer, Shree Cement says, “Effective lubrication management remains one of the most critical factors in extending the lifespan of cement plant drive systems. Proper lubrication, supported by regular oil analysis, vibration diagnostics, and condition monitoring, helps minimise wear, prevent unexpected failures, and maintain the integrity of critical components such as gearboxes, motors, and drive assemblies. By identifying potential issues at an early stage, plants can move from reactive maintenance to a more proactive and reliability-focused approach.”
“Smart motors, intelligent drives, and next-generation gearboxes are set to redefine cement plant maintenance and performance. Equipped with embedded sensors, IoT connectivity, digital twins, and AI-driven diagnostics, these technologies enable real-time condition monitoring, predictive maintenance, and seamless digital integration. As the industry embraces Industry 4.0, smart drive systems will play a pivotal role in improving energy efficiency, reducing downtime, and optimising asset performance across the cement manufacturing value chain” he adds.
Industry studies suggest that rotating equipment accounts for a significant proportion of maintenance expenditure in process industries. Effective design, selection, and maintenance of gears, drives, and motors therefore have a direct influence on asset utilisation, operational efficiency, and total cost of ownership.

The cost of downtime: reliability challenges in rotating equipment
Unplanned downtime remains one of the most expensive challenges facing cement manufacturers. Industry estimates indicate that a major failure involving a critical gearbox, kiln drive, or grinding mill can result in production losses running into lakhs of rupees per hour, depending on plant capacity and operating conditions.
Sanjeev Arora, President – Motion Business & IEC LV Motors Division, ABB India says, “One of the most significant shifts taking place in industrial decision-making today is moving away from evaluating equipment based solely on upfront capital cost toward understanding total cost of ownership (TCO). In a typical motor system, the purchase price often represents only a small fraction of the total lifecycle cost however energy consumption, maintenance requirements, downtime and operating efficiency account for the vast majority of long-term operational expenses. For cement manufacturers operating in highly competitive markets, this distinction is critical.”
“A high efficiency motor paired with an appropriately configured variable speed drive may require a higher initial investment, but the long-term benefits are substantial. Reduced electricity consumption, lower maintenance needs, longer service intervals and improved process stability can deliver faster payback and stronger profitability over time” he adds.
Cement plants present a particularly challenging environment for rotating equipment. Dust ingress, thermal fluctuations, shock loads, vibration, shaft misalignment, and lubrication contamination contribute significantly to equipment degradation. Studies by SKF indicate that nearly 50 per cent of bearing failures are linked to lubrication issues and contamination, while improper alignment and vibration-related problems remain leading causes of gearbox and motor failures.

Energy-efficient motors and drives: unlocking operational savings
Energy is one of the largest operating expenses for cement manufacturers, often accounting for 25 per cent to 35 per cent of total production costs. Grinding operations alone can consume nearly 60 per cent to 70 per cent of a plant’s electrical energy, making energy-efficient motors and drives a strategic investment.
According to the International Energy Agency, high-efficiency motors combined with Variable Frequency Drives (VFDs) can reduce energy consumption by 20 per cent to 30 per cent in suitable applications. By matching motor speed and torque to actual process requirements, VFDs minimise unnecessary power consumption while reducing mechanical stress on equipment, improving both efficiency and reliability.

Advances in gearbox design and power transmission technologies
Modern gearbox technology has evolved significantly in response to the increasing demands of cement manufacturing. Advanced materials, case-hardened gears, optimised tooth profiles, improved surface finishing, and enhanced lubrication systems are helping reduce friction, wear, and thermal loading.
Girish Hanchate, Director – Industrial Market, India SKF India (Industrial) says, “Smart diagnostics are significantly improving the lifecycle of gears, motors, and other rotating equipment by enabling a shift from reactive maintenance to condition-based asset management. Hidden issues such as vibration anomalies, bearing defects, misalignment, and temperature fluctuations can quietly reduce plant throughput by 10 per cent to 20 per cent while increasing energy consumption long before a breakdown occurs. By leveraging advanced sensors, predictive analytics, machine learning, and real-time monitoring of vibration, temperature, and motor current, cement manufacturers can detect developing faults early, optimise maintenance schedules, and prevent costly secondary damage. This not only improves reliability but also supports energy efficiency and sustainability objectives.”
“The next major evolution in drive and bearing technology lies in the development of fully integrated smart mechanical ecosystems that combine high-performance bearings, advanced lubrication management, and digital intelligence. Sensor-enabled condition monitoring embedded directly within bearings and drive systems allows operators to capture critical operational data at the source, enabling predictive maintenance and real-time performance optimisation. Innovations such as SKF’s VA9A1 Spherical Roller Bearing series, engineered specifically for demanding cement applications such as crushers and kilns, demonstrate this trend. By increasing internal bearing space and optimising lubricant flow, these designs improve grease retention, reduce wear, minimise downtime, and create more resilient, energy-efficient rotating equipment systems for the future of cement manufacturing” he adds.
Manufacturers are increasingly focusing on compact, high-torque gearbox designs capable of delivering higher power density while maintaining service life. Innovations such as condition-monitored gear systems, improved sealing technologies, and modular gearbox architectures are simplifying maintenance while enhancing operational reliability.

Predictive maintenance, condition monitoring, and asset health management
The shift from reactive to predictive maintenance is transforming asset management across the cement industry. Technologies such as vibration monitoring, thermography, oil analysis, ultrasound testing, and motor current signature analysis are enabling operators to identify potential failures before they occur.
Research by Deloitte suggests that predictive maintenance can reduce breakdowns by up to 70 per cent and lower maintenance costs by 25 per cent. In cement plants, where shutdown windows are limited and equipment operates continuously, predictive maintenance offers a powerful tool for improving reliability and extending asset life.
Digitalisation, industry 4.0, and the rise of intelligent drive systems
Industry 4.0 technologies are redefining the role of gears, drives, and motors. Smart sensors embedded within motors, bearings, and gear systems can continuously monitor temperature, vibration, load, lubrication condition, and energy consumption.
Girish Hanchate says, “As the industry embraces automation, sustainability, and digital transformation, the importance of intelligent motion technologies will continue to grow. The convergence of advanced engineering, predictive maintenance, and Industry 4.0 solutions is creating a new generation of cement plants where reliability, efficiency, and sustainability work together to deliver long-term value. For cement manufacturers navigating increasing production demands and environmental expectations, investing in smarter gears, drives, and motors is no longer optional—it is a business imperative.”
Cloud-based monitoring platforms and Industrial Internet of Things (IIoT) architectures enable maintenance teams to access equipment health data remotely, improving visibility across geographically dispersed operations. Advanced analytics and
artificial intelligence are further enhancing fault detection capabilities, enabling more accurate maintenance planning.
The emergence of digital twins represents another significant development. By creating virtual replicas of physical assets, operators can simulate operating conditions, predict failures, optimise maintenance schedules, and improve lifecycle management decisions. These technologies are helping transform rotating equipment into intelligent assets that actively contribute to operational decision-making.

Building future-ready cement plants through smart motion technologies
The future of cement manufacturing will depend heavily on the ability to integrate mechanical reliability with digital intelligence. Smart motion technologies combine high-efficiency motors,
intelligent drives, condition monitoring systems, and automation platforms to create more responsive and efficient operations.
Sustainability goals are also accelerating investment in advanced motion technologies. Reduced energy consumption, improved equipment efficiency, and extended asset life contribute directly to lower carbon emissions and reduced resource consumption.
These benefits align closely with the industry’s decarbonisation objectives.
As capacity expansions continue across India, future-ready cement plants will increasingly prioritise reliability, flexibility, and data-driven decision-making. Organisations that successfully integrate smart motion technologies into their operations will be better positioned to reduce costs, improve productivity, and maintain a competitive advantage in a rapidly evolving market.

Conclusion
Gears, drives, and motors are no longer viewed solely as mechanical components; they have become strategic assets that influence every aspect of cement plant performance. Their reliability affects production continuity, their efficiency impacts operating costs, and their digital capabilities increasingly shape maintenance and operational strategies.

  • Kanika Mathur

Continue Reading

Concrete

Liquid Intelligence

Published

on

By

Shares

Lubrication has evolved from a routine maintenance activity into a critical driver of reliability, energy efficiency, and sustainability in cement manufacturing. ICR explores how advanced lubricants, predictive maintenance, and Total Lubrication Management are helping cement plants reduce downtime, optimise performance, and achieve long-term operational excellence.

In the cement industry, discussions around operational excellence often focus on kiln efficiency, alternative fuels, digitalisation, and process optimisation. Yet one of the most influential factors affecting equipment reliability, energy consumption, maintenance costs, and sustainability often receives far less strategic attention: lubrication. From vertical roller mills and kiln drives to crushers, conveyors, clinker coolers, and large industrial gearboxes, every critical asset depends on effective lubrication to minimise friction, reduce wear, and ensure uninterrupted operation.
The importance of lubrication extends far beyond routine maintenance. According to tribology research, nearly 23 per cent of global energy consumption is associated with overcoming friction and replacing worn components. Researchers have estimated that implementing advanced tribological practices could reduce global energy consumption by as much as 8.7 per cent in the long term. For cement manufacturers operating in highly demanding environments characterised by abrasive dust, heavy loads, high temperatures, vibration, and continuous operations exceeding 8,000 hours annually, lubrication has evolved from a maintenance function into a strategic lever for reliability, sustainability, and profitability.
The significance of this opportunity becomes even clearer when viewed against the backdrop of the cement industry’s environmental challenges. According to the International Energy Agency (IEA), cement manufacturing accounts for approximately 7–8 per cent of global CO2 emissions and consumes nearly 5 per cent of industrial energy worldwide. While much attention is rightly directed toward alternative fuels, clinker factor reduction, and carbon capture technologies, maintenance practices such as lubrication remain one of the most practical and immediately deployable avenues for improving efficiency and reducing emissions.

Why lubrication is critical to cement plant reliability
Cement manufacturing relies on some of the most heavily loaded rotating equipment found in industrial production. Kiln support rollers, girth gears, vertical roller mills, crushers, conveyors, ID fans, and large gearboxes operate under extreme conditions where temperatures, loads, and contamination levels routinely challenge equipment integrity. Under such circumstances, lubricants serve not merely as friction-reducing agents but as essential protective barriers that prevent metal-to-metal contact, dissipate heat, minimise wear, and extend component life.
A modern integrated cement plant may contain thousands of lubrication points distributed across critical and auxiliary equipment. Even a minor lubrication-related issue can escalate rapidly when equipment operates continuously around the clock. Unlike batch manufacturing operations, cement plants often have limited opportunities for shutdowns, making asset reliability a key business priority. Effective lubrication directly contributes to machine availability, process stability, and production continuity.
Industry studies consistently demonstrate the relationship between lubrication and reliability. Research published by SKF indicates that approximately 36 per cent of premature bearing failures are caused by poor lubrication practices, while bearing damage accounts for nearly 50 per cent of rotating equipment failures globally. Similarly, studies by Machinery Lubrication have found that improper lubrication contributes to roughly 43 per cent of mechanical failures and more than half of bearing-related breakdowns. These statistics highlight a critical reality: lubrication is not simply a maintenance task but a reliability strategy.
The consequences of lubricant failure extend well beyond replacement parts. A failed bearing in a vertical roller mill, kiln drive, or critical conveyor system can trigger extended downtime, emergency maintenance costs, production losses, and supply chain disruptions. In large integrated cement plants, even a few hours of unplanned downtime can result in significant financial losses, making lubrication one of the most cost-effective reliability investments available.

Hidden cost of poor lubrication management
Many organisations continue to treat lubrication as a consumable expense rather than a strategic asset management function. This mindset often results in inconsistent lubrication schedules, incorrect lubricant selection, contamination issues, over-lubrication, under-lubrication, and inadequate monitoring practices. The resulting impact is often far greater than the actual cost of the lubricant itself.
Professor Procyon Mukhejee says “Lubricant purchasing often followed a conventional sourcing model: negotiate annual contracts, standardise product grades and optimise price. That logic is still relevant but no longer sufficient. In a cement plant, a lower-cost lubricant that reduces purchase spend may increase oil replacement frequency, raise wear rates or contribute to avoidable downtime. That trade-off is forcing procurement teams to think differently.”
According to industry research, up to 70 per cent of mechanical failures can be linked to contamination, improper lubricant selection, or inadequate lubrication practices. Noria Corporation estimates that world-class lubrication programmes can reduce maintenance costs by 20–40 per cent and extend equipment life by as much as 50 per cent. Conversely, reactive lubrication practices increase spare-part consumption, raise labour requirements, accelerate equipment wear, and elevate operational risk.
The hidden costs are particularly severe in cement plants because contaminants such as dust, moisture, and wear particles are ever-present. Even microscopic contaminants can damage bearing surfaces and gear teeth, leading to premature failure. Poor lubrication management also increases energy consumption because higher friction levels require greater power input to maintain production rates. As a result, the true cost of poor lubrication extends far beyond maintenance budgets and directly impacts overall plant profitability.

Lubricants and energy efficiency
Energy represents one of the largest operating expenses in cement manufacturing. Grinding operations alone account for approximately 60–70 per cent of total electrical energy consumption within a typical cement plant. Consequently, any improvement in equipment efficiency can generate substantial cost savings over time.
Lubricants contribute directly to energy efficiency by reducing friction between moving surfaces. Lower friction means less resistance, lower operating temperatures, and reduced power requirements. Advanced lubricant formulations are specifically designed to optimise film strength while minimising energy losses across gears, bearings, and hydraulic systems.
Dr SB Hegde, Global Cement Industry Expert says, “One of the most overlooked aspects of lubrication in cement plant operations is effective contamination control combined with disciplined greasing practices. Cement dust, which is often harder than bearing steel, can mix with lubricants and create an abrasive grinding paste that accelerates wear and is responsible for a significant share of bearing failures. Despite this, many plants still rely on manual, time-based greasing and outdated sealing systems, resulting in higher energy consumption, premature component wear, and frequent unplanned shutdowns. Automatic lubrication systems, coupled with robust dust exclusion measures, remain one of the most underutilised yet effective reliability solutions in the industry.”
“Smart lubrication practices can have a direct and measurable impact on both profitability and sustainability. The use of high-performance synthetic lubricants, combined with predictive oil condition monitoring, can typically deliver energy savings of 3–4 per cent, translating into substantial annual cost reductions for cement manufacturers. In one notable case, a large cement producer implemented wireless condition monitoring alongside advanced lubrication practices on critical assets and achieved a 57-times return on investment within six months. The initiative generated savings exceeding `8.4 crore and prevented a major bearing failure that could have caused more than 160 hours of downtime, highlighting the significant financial value of proactive lubrication management” he adds.
Research by ExxonMobil and other lubricant manufacturers has demonstrated that synthetic lubricants can reduce energy consumption in industrial gear systems by 2–6 per cent under appropriate operating conditions. While these savings may appear modest on an individual machine basis, the cumulative impact across multiple mills, fans, conveyors, and drive systems can be considerable. For large cement manufacturers operating energy-intensive facilities, even a 2 per cent reduction in power consumption can translate into significant annual cost savings.
Furthermore, reduced friction contributes to improved equipment performance and lower heat generation, enabling machinery to operate more consistently under demanding conditions. In an industry where energy efficiency and carbon reduction targets are becoming increasingly important, lubrication represents a practical pathway for achieving measurable improvements.

Advances in synthetic and high-performance lubricants
The lubricant industry has undergone significant transformation over the past decade. Traditional mineral oils are increasingly being supplemented or replaced by synthetic and semi-synthetic formulations engineered specifically for demanding industrial applications.
Modern synthetic lubricants provide superior oxidation resistance, thermal stability, viscosity retention, load-carrying capacity, and wear protection compared to conventional products. These characteristics are particularly valuable in cement applications where equipment is exposed to extreme temperatures, heavy loads, and continuous operation.
Many premium synthetic lubricants now deliver service lives two to five times longer than traditional mineral oils. This not only reduces lubricant consumption but also minimises maintenance interventions and associated downtime. For cement manufacturers, extended oil drain intervals can significantly improve equipment availability and reduce lifecycle costs.
Synthetic gear oils have gained widespread acceptance in applications such as kiln drives, vertical roller mills, and high-load gearboxes. Field studies have reported gearbox temperature reductions of up to 10°C following conversion from conventional lubricants to advanced synthetic alternatives. Lower operating temperatures contribute directly to improved component life, reduced oxidation, and enhanced overall reliability.

Predictive maintenance, oil analysis, and condition monitoring
The emergence of predictive maintenance has transformed lubrication from a reactive maintenance activity into a proactive asset management discipline. Rather than relying solely on time-based maintenance schedules, cement plants increasingly use oil analysis and condition monitoring technologies to assess equipment health continuously.
Oil analysis provides a wealth of information about both lubricant condition and machine health. Parameters such as viscosity, oxidation, contamination levels, moisture content, additive depletion, and wear particle concentrations can reveal developing problems long before equipment failure occurs. In many cases, lubrication-related abnormalities represent the earliest warning signs of impending mechanical issues.
Gaurav K Mathur says “Dust contamination remains the single biggest lubrication-related challenge affecting cement plant productivity today. Airborne silica and clinker dust penetrate bearings, gear housings, and lubrication systems, transforming lubricants from protective agents into abrasive mediums. These contaminants are often as hard as bearing steel and create a three-body abrasion mechanism that rapidly accelerates wear, especially under the high temperatures, shock loads, vibration, and continuous-duty operating conditions typical of cement plants. Poor sealing systems can increase wear rates by three to five times, leading to premature failures, rising maintenance costs, and reduced equipment life. Compounding the issue is a growing industry-wide shortage of experienced lubrication professionals, resulting in a loss of critical maintenance expertise and an increasing reliance on reactive rather than predictive maintenance.”
Reliability experts frequently describe oil analysis as a “blood test” for machinery because it provides valuable insights into internal equipment conditions without requiring disassembly. Studies suggest that every dollar invested in predictive maintenance can generate returns of five to ten dollars through avoided failures and reduced downtime.
Leading cement producers increasingly combine oil analysis with vibration monitoring, thermography, ultrasonic inspection, and digital condition monitoring platforms. This integrated approach enables maintenance teams to move from reactive maintenance to predictive asset management, reducing downtime while improving equipment lifespan and operational reliability.

Total lubrication management: a strategic approach to asset health
As reliability expectations continue to increase, many cement manufacturers are adopting Total Lubrication Management (TLM) programmes.
TLM extends beyond lubricant selection and incorporates every aspect of lubrication management, including storage, handling, contamination control, application methods, oil analysis, training, and continuous improvement.
Gaurav K Mathur, Director & Chief Executive, Global Technical Services says, “Smarter lubrication practices can significantly reduce both energy consumption and maintenance expenditure. The implementation of Total Lubrication Management (TLM), supported by careful lubricant selection, customised lubrication strategies, and robust contamination control, helps reduce friction across critical equipment and improve operational efficiency by up to 3 per cent. In energy-intensive cement plants, even marginal efficiency gains can translate into substantial cost savings. Improved lubrication practices also reduce wear, minimise overheating, extend equipment life, and lower the frequency of maintenance interventions, directly contributing to higher plant availability and lower total operating costs.”
“The most impactful innovation for the cement sector will not be a single lubricant product but the widespread adoption of Total Lubrication Management as a structured reliability framework. TLM integrates contamination control, oil analysis, condition-based maintenance, online filtration, lubricant regeneration, digital tracking, and condition monitoring into a unified system. This approach transforms lubrication from a routine maintenance activity into a strategic asset management function. The result is improved equipment reliability, reduced lubricant consumption, lower waste generation, enhanced energy efficiency, and a smaller carbon footprint. In an industry characterised by harsh operating environments and growing sustainability expectations, TLM offers a practical pathway to achieving higher reliability, improved profitability, and long-term operational sustainability” he adds.
One of the primary objectives of TLM is contamination control. Dust, moisture, and wear particles are widely recognised as the leading causes of lubricant degradation and equipment failure. Given the inherently dusty environment of cement plants, effective contamination control becomes essential for maintaining lubricant quality and equipment health. Another important component of TLM is lubricant consolidation. Many plants operate with dozens of lubricant grades, increasing inventory complexity and the risk of cross-contamination. Best-in-class lubrication programmes often reduce lubricant inventories by more than 30 per cent while simultaneously improving operational reliability.
Training also plays a critical role. Industry surveys suggest that fewer than half of lubrication technicians receive formal lubrication training. Yet organisations that invest in lubrication education consistently report lower failure rates, improved maintenance performance, and better asset utilisation. One widely cited industrial case study documented a reduction in bearing failures from nearly 400 per month to just 12 after implementing comprehensive lubrication excellence initiatives.

Supporting sustainability
Sustainability has become a central priority across the cement industry. While alternative fuels and carbon capture technologies often dominate discussions, lubrication also contributes significantly to environmental performance.
Longer-lasting lubricants reduce waste oil generation and disposal requirements. Large integrated cement plants may consume tens of thousands of litres of lubricants annually, making lubricant lifecycle management an important sustainability consideration. Extending drain intervals by even 50 per cent can substantially reduce lubricant consumption and associated environmental impacts. Improved lubrication also extends equipment life, reducing demand for replacement components and lowering the environmental footprint associated with manufacturing, transportation, and installation activities. By reducing friction and wear, lubricants enable machinery to operate more efficiently while consuming less energy.
Tribology researchers Holmberg and Erdemir estimate that advanced friction-reduction technologies could potentially reduce global carbon emissions by up to 1,460 million tonnes annually. Although this figure spans multiple industrial sectors, it
highlights the enormous sustainability potential of improved lubrication practices. For cement manufacturers pursuing net-zero ambitions, lubrication represents one of the most accessible and cost-effective tools available.

Digitalisation, automation, and smart monitoring
The future of lubrication management is increasingly digital. Smart sensors, Industrial IoT platforms, automated lubrication systems, and artificial intelligence are changing how maintenance teams manage equipment health.
Modern lubrication monitoring systems can continuously track temperature, viscosity, moisture levels, contamination levels, and lubricant condition in real time. This enables maintenance personnel to identify emerging issues before they affect production, allowing interventions to be planned rather than forced by equipment failures.
“The future of lubrication management will be defined by the integration of smart, data-driven, and automated systems powered by IoT sensors, artificial intelligence, and real-time oil condition monitoring. These technologies are enabling a shift from traditional schedule-based lubrication to predictive and prescriptive maintenance, where lubricant quantity, frequency, and selection are optimised based on actual equipment condition. The result will be near-zero unplanned downtime, lower lubricant consumption, higher equipment reliability, and improved Overall Equipment Effectiveness (OEE). As India continues to add significant cement manufacturing capacity, early adopters of intelligent lubrication technologies will gain a competitive advantage through lower operating costs, greater reliability, and stronger sustainability performance” says Dr Hegde.
Automated lubrication systems are also becoming more prevalent throughout the cement industry. By delivering precise lubricant quantities at predetermined intervals, these systems eliminate many of the inconsistencies associated with manual lubrication practices. The result is improved equipment protection, lower lubricant consumption, and enhanced reliability.
Market analysts forecast the global predictive maintenance market to exceed $50 billion by 2030, reflecting the growing importance of data-driven maintenance strategies. As digital technologies continue to mature, lubrication will become an increasingly integrated component of broader asset performance management systems.

Conclusion
As cement manufacturers pursue greater productivity, higher sustainability standards, and improved operational resilience, lubrication must be recognised as a strategic business function rather than a routine maintenance activity. The evidence is overwhelming: effective lubrication improves reliability, reduces energy consumption, extends equipment life, lowers maintenance costs, and supports sustainability objectives simultaneously.
The next frontier of cement plant optimisation will not be driven solely by larger kilns, more efficient mills, or alternative fuels. It will also be shaped by how effectively operators manage the health of their critical assets. Through advanced lubricants, predictive maintenance, oil analysis, contamination control, and Total Lubrication Management programmes, cement manufacturers can unlock substantial gains in operational performance while supporting long-term environmental and business goals.
In an increasingly competitive industry, lubrication is no longer merely about reducing friction. It is about enabling reliability, protecting profitability, and creating a foundation for sustainable growth. The plants that recognise this shift and invest in lubrication excellence today will be best positioned to meet the performance demands of tomorrow.

Continue Reading

Video Thumbnail

    SIGN-UP FOR OUR GENERAL NEWSLETTER


    Trending News

    SUBSCRIBE TO THE NEWSLETTER

     

    Don't miss out on valuable insights and opportunities to connect with like minded professionals.

     


      This will close in 0 seconds