Concrete
Efficient grinding unit selection impacts profitability
Published
4 years agoon
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admin
ICR gets Vimal Jain, Director – Technical, HeidelbergCement India, to share his views about the innovations in technology of the grinding process and grinding aids as well as his understanding on how the entire process can be made more energy-efficient and cost-effective.
Explain the grinding process in cement manufacturing.
The grinding process is needed to create surface area for a good chemical reaction and reactivity to occur in cement manufacturing. The grinding process is mainly required for raw material, coal and clinker grinding in the cement manufacturing process.
The process of cement manufacturing involves grinding clinker granules along with blending materials or additives and gypsum to produce a fine powder called cement. Depending on the quality of clinker and type of cement, blending material/gypsum are added in controlled proportion to produce a quality product to meet the prescribed quality as per given codes.
Optimum fineness needs to be found for the type of raw materials, coal, and clinker to avoid over-grinding, which comes with ‘excess energy’ consumption and has a negative impact on quality and cost.
The quality of cement depends on its physical and chemical properties. Technology has advanced over the period and the grinding process can help in augmenting some properties of cement.
Tell us about the equipment used for grinding raw material and clinker.
The main equipment used for grinding raw materials and clinker are categorised based on their size reduction concept and mechanism as,
Ball Mill (BM):
Size reduction mechanism –
- Impact: particle breakage by a single rigid force causing fracture.
- Attrition or Abrasion: arising from particles scraping against one another or against a
rigid surface.
Ball mills are the most widely installed grinding equipment in the cement industry. It consists of a rotating cylinder filled with steel balls that tumble inside the mill, applying impact and friction forces to the clinker particles. For better grinding efficiency, the mill may be operated with one, two or three internal compartments separated by diaphragms that prevent the transfer of the balls between the compartments while allowing the flow of the ground material through the mill.
Roller Press (RP)
Size reduction mechanism – Compression: particle disintegration by two rigid forces.
The roller press has been extensively used as a pre-grinder as well as a stand-alone cement mill. It compresses the material in a gap between two counter-rotating grinding rollers lined with wear-resistant material. The output product contains fine and coarse particles with a large number of cracks and weak points that significantly reduce the energy requirement during the further stage of fine grinding.
Vertical Roller Mill (VRM)
Size reduction mechanism – - Compression
- Shear or Chipping: produced by fluid or particle-particle interaction.
- Attrition or Abrasion
In a vertical roller mill, two-four rollers turning on their axles press on a rotating grinding table mounted on the yoke of a gearbox. Pressure is exerted hydraulically. This mill also has a built-in high-efficiency separator above the rollers. The vertical roller mills offer high drying capacity, comparatively low energy consumption, and compactness.
Hybrid Grinding: a combination of Ball Mill with Roller press
Horo Mill (HM): it is similar to the vertical mill but the roller arrangement differs from VRM.
In the ball mill, RP and Combined grinding system separation take place outside the grinding mill, whereas in the VRM separation and grinding take place in one system.
The technologies involved in cement can be classified as per the following:
Intergrinding: With the intergrinding process, all components of the blended cement are ground together. In that way, the cement is homogenised during the grinding, and at the cement plant only one silo is needed. Because of interactions between the different cement components due to differences in grindability, the PSD of the blended cement and the different components is difficult to control due to differential grindability due to different hardness of materials. Equipment for the inter grindings are Ball mills, roll press/ Pre-grinder + Ball mill, Horo mill, and VRMs.
Separate grinding: The separate grinding process is grinding the various components separately, storing them, and mixing them according to the desired proportions. This process has several advantages: the PSD of each component and of the blended cement can be controlled according to the components’ hardness and required fineness, and appropriate grinding equipment can be used for each component. But in this case, several silos for storage are needed at the cement plant. Equipment for separate grinding is all the grinding equipment mentioned above, with the use of blenders required to blend the grounded material in the proportion needed for the specific cement product.
The advantage of separate grinding can be to produce a wide range of cements from one plant.
Grinding systems are either ‘open circuit’ or ‘closed circuit.’ In an open circuit system, the feed rate of the incoming clinker is adjusted to achieve the desired fineness of the product. In a closed circuit system, coarse particles are separated from the finer product and returned for further grinding.
What are the key functionalities that are looked at while installing a grinding unit in your plant?
The key factors, which shall be carefully considered, include:
- Product quality requirement: market requirement
- Machine sizing and layout: investment cost
- Raw materials quality and characteristics: input materials
- Mechanical design: maintenance cost and reliability
- Latest design innovations including high grinding efficiency, energy saving and environmental protection, good quality of finished products, etc., performance improvement
- On-demand changes: project-specific requirement
- Product diversification: commercial reasons
- Capex vs Opex economics: budget
- Spare part and service availability: after-sales service
What is the contribution of grinding units in making cement-making processes efficient and productive?
The grinding unit plays an important role in making the operation efficient. Approximately 60 per cent of the cement power is absorbed in the grinding circuit, and to be competitive in the market, power cost plays an important role.
It is also observed that particle size distribution is better in the BM compared to other mills considering the product quality requirement.
The following grinding units are involved in cement making process:
- Raw material grinding: to improve raw meal burning behavior, clinker quality, and kiln output, including thermal energy requirement
- Coal grinding: better combustion of fuels, improves the flame property, and avoids CO2 generation, including improved burning process
- Cement grinding: cement hydration, strength development, and water demand
How do grinding units contribute to the profitability of the cement-making process?
The grinding unit contributes to profitability in the following ways:
The electrical energy price is a major contributor to the cost of production. Therefore, producing cement with less energy is becoming a key element of profitability: as the grinding process consumes about 60 per cent of the total plant electrical energy demand and about 20 per cent of cement production variable cost. So efficient grinding unit selection impacts profitability of cement manufacturing. Optimum fineness needs to be found to avoid over grinding and consuming excess energy Final product PSD (particle size distribution) improves quality and profitability. Where two types of cement have identical surface areas, the cement with the narrower PSD will have a higher compressive strength.
Maximum use of low-cost blending materials, technology and layout such that the repairs and maintenance and manpower costs are lower, etc.
What are the materials and equipment that aid in the process of cement grinding?
Grinding Aid (GA): In the grinding process, agglomeration takes place, due to this grinding efficiency is reduced and the output and quality of product effects. The GA is a very efficient way to avoid the agglomeration mechanism and improve the over-grinding efficiency. Therefore, GA helps to increase the grinding mill output and reduces
the electrical energy consumption, resulting in improving profitability.
Performance Enhancers/Quality Improvers: Due to the quality of raw materials and variation in the burning process, desired clinker phase formation does not take place, which impacts the cement performance, workability, and durability. Therefore, in addition to a grinding aid, additional chemicals are used to improve the cement performance and properties, such as setting time and strength development
Functional Additives: The additive imparts a specific property, such as air entrainment in masonry cement or chromium (VI) reduction.
Supplementary Cementitious Materials (SCM): Supplementary Cementitious Materials (SCMs) are added to cement mixtures for various reasons, including improving durability, decreasing permeability, aiding in pumpability, mitigating alkali reactivity, and improving the overall hardened properties of concrete. This also helps to reduce the carbon dioxide footprint in cement manufacturing. The use of SCMs also reduces the dependency on natural resources and enhances the circular economy.
Equipment: Raw materials storage, dosing station, raw material transport conveyors/elevators, weigh feeders, air separators, baghouse, product transport and storage silos are the key equipment of the grinding units.
Air Separator is one of the vital equipment for grinding systems that plays a significant role in maintaining product quality and increasing the grinding system productivity.
QC Lab: It’s a must for sampling and testing so that consistent quality material is produced and supplied to customers.
How do you ensure standards in the process?
During manufacturing, quality control parameters are established with reference to the national standards, and accordingly, the sampling and testing plan of the company is maintained.
There are very well descriptive quality control and assurance plans at various stages of the manufacturing/operations.
At each of our plants, we have state-of-the-art laboratories to produce quality cement much above the spec from the BIS. We have a very low standard deviation in the finished product that indicates the consistency in the cement. We are certified with applicable ISO standards to ensure that the product supplied is safe, environmentally compliant, and quality consistent.
How often is the same monitored?
Cement manufacturing is a continuous process and monitoring is done in 24×7 mode to ensure cement quality.
The quality control starts from the mine to the cement packing, and there are well-defined testing protocols at a sampling frequency. Plants are equipped with various material feeding and transportation systems to maintain the quality and process.
What challenges do you face in the process of cement grinding?
Availability and economics of outsourced materials are major challenges these days. The key challenges are as follows:
- Availability of reliable and economical energy sources, power generation is becoming expensive due to increasing fuel prices and quality of fuel.
- Right quality and Quantity of SCMs (Supplementary Cementitious Materials) are needed to achieve cement quality and also to mitigate the challenges of CO2 reduction in the cement-making process
- Production of multiple cement types needs more storage facilities and impacts mill performance and product quality
- SCMs with high moisture content demand drying arrangements resulting in a need for more capital as well as operational expenses.
- Skilled manpower for operation and maintenance.
What are the innovations you would like to see in the technology of the grinding process and grinding aids?
Innovations play an important role in the cement industry. The quality of the product can be enhanced by adopting the right technology and the optimum key performance indicators for producing a quality product at a competitive price. We would like to see further innovation for:
- Energy efficient equipment and drives to lower the power consumption
- Separate grinding of cement to improve product quality and lower power consumption to reduce CO2 emission.
- New hybrid formulations in grinding aid to improve product quality, specific energy consumption and reduce clinker ratio in cement.
- Innovation for cement production by substituting max possible clinker incorporation by alternative / lower quality cementitious materials but maintaining the product quality.
- New wear materials for enhancing the life of wear components to reduce the consumables cost per ton.
–Kanika Mathur
Concrete
Dalmia Bharat launches Weather 365 in East India
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Published
15 hours agoon
May 15, 2026By
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Concrete
Filtration Technology is Critical for Efficient Logistics
Published
18 hours agoon
May 15, 2026By
admin
Niranjan Kirloskar, MD, Fleetguard Filters, makes the case that filtration technology, which has been long treated as a routine consumable, is in fact a strategic performance enabler across every stage of cement production and logistics.
India’s cement industry forms the core for infrastructure growth of the country. With an expected compound annual growth rate of six to eight per cent, India has secured its position as the second-largest cement producer globally. This growth is a result of the increasing demand across, resulting in capacity expansion. Consequently, cement manufacturers are now also focusing on running the factories as efficiently as possible to stay competitive and profitable.
While a large portion of focus still remains on production technologies and capacity utilisation, the hidden factor in profitability is the efficiency of cement logistics. The logistics alone account for nearly 30 per cent to 40 per cent of the total cost of cement, making efficiency in this segment a key lever for profitability and reliability.
In the midst of this complex and high-intensity ecosystem, filtration often remains one of the most underappreciated yet essential enablers of performance.
A demanding operational landscape
Cement production and logistics inherently operate in some of the harshest industrial environments. With processes such as quarrying, crushing, grinding, clinker production, and bulk material handling expose the machinery to constant high temperatures, heavy loads, and dust, often the silent destructive force for engines.
The ecosystem is abrasive, and often one with a high contamination index. These challenging conditions demand equipment such as the excavators, crushers, compressors, and transport vehicles to perform and perform efficiently. The continuous exposure to contamination across every aspect like air, fuel, lubrication, and even hydraulic systems causes long-term damage. Studies have also shown that 70 to 80 per cent of hydraulic system failures are directly linked to contamination, while primary cause of engine wear is inadequate air filtration.
For engines as heavy as these, even a minor contaminant has a cascading effect; reducing efficiency, performance and culminating to unplanned downtime. Particles as small as 5 to 10 microns, far smaller than a human hair (~70 microns), can cause significant damage to critical engine components. In an industry where margins are closely linked to operational efficiency, such disruptions can significantly affect both cost structures and delivery timelines.
Dust management: A persistent challenge
Dust is a natural by-product in cement operations. From drilling and blasting in the quarries to packing in plants, this fine particulate matter does occupy a large space in operations. Dust concentration levels in quarry and crushing zones often create extremely high particulate exposure for equipment. These fine particles, when enter the engines and critical systems, accelerates the wear and tear of the component, affecting directly the operational efficiency. Over time every block fall; engine performance declines, fuel consumption rises, and maintenance cycles shorten. In this case, effective air filtration is the natural first line of defence. Advanced filtration systems are designed to capture high volumes of particulate matter while maintaining consistent airflow, ensuring that engines and equipment operate under optimal conditions.
In high-dust applications, as in cement production, even the filtration systems are expected to sustain performance over extended periods without the need of frequent replacement. This becomes crucial in remote quarry locations where access to frequent maintenance may be limited.
Fluid cleanliness and system integrity
Beyond air filtration, fluid systems also play a crucial role for equipment reliability in cement operations. Fuel systems are required to remain free from contaminants for efficient working of combustion and injection protection. Additionally, lubrication systems also need to maintain the oil purity to reduce friction and prevent any premature wear of moving parts. The hydraulic systems, which are key to several heavy equipment operations, are especially sensitive to contamination.
If fine particles or water enters these systems, it can lead to reduced efficiency, erratic performance, and eventual failure of the system. Modern filtration systems are designed with high-efficiency media capable of removing extremely fine contaminants, with advanced fuel and oil filtration solutions filtering particles as small as two to five microns. Multi-stage filtration systems further ensure that fluid performance is maintained even under challenging operating conditions.
Another critical aspect of fuel systems is water separation. Removing moisture helps prevent corrosion, improves combustion efficiency and enhances overall engine reliability. Modern water separation technologies can achieve over 95 per cent efficiency in removing water from fuel systems.
Ensuring reliability across the value chain
Filtration plays a critical role across every stage of cement logistics:
• Quarry operations: Equipment operates in highly abrasive environments, requiring strong protection against dust ingress and hydraulic contamination.
• Processing units: Crushers, kilns, and grinding mills depend on clean lubrication and cooling systems to sustain continuous operations.
• Material handling systems: Pneumatic and mechanical systems rely on clean air and fluid systems for efficiency and reliability.
• Transportation networks: Bulk carriers and trucks must maintain engine health and fuel efficiency to ensure timely deliveries.
Across these operations, filtration plays a vital role; as it supports consistent equipment performance while reducing the risk of unexpected failures.
Effective filtration solutions can reduce unscheduled equipment failures by 30 to 50 per cent across heavy-duty operations.
Uptime as a strategic imperative
In cement manufacturing, uptime is currency. Downtime not only delays the production, but it also greatly impacts the supply commitments and logistics planning. With the right filtration systems, contaminants are kept at bay from entering the
critical systems, and they also significantly extend the service intervals.
Optimised filtration can extend service intervals by 20 to 40 per cent, reducing maintenance frequency while maintaining consistent performance across demanding operating conditions. Filtration systems designed for heavy-duty applications sustain efficiency throughout their lifecycle, ensuring reliable protection with minimal interruptions. This leads to improved equipment availability, lower maintenance costs, and more predictable operations, with well-maintained systems capable of achieving uptime levels of over 90 to 95 per cent in challenging cement environments.
Supporting emission and sustainability goals
With the rising environmental awareness, the cement industry too is aligning with the stricter norms and sustainability targets. In this scenario, the operational efficiency is directly linked to emission control.
Air and fuel systems that are clean enable
much more efficient combustion. They also reduce emissions from both the stationary equipment and transport fleets. Similarly, with a well-maintained fluid cleanliness, emission systems function better. Poor combustion due to contamination can increase emissions by 5 to 10 per cent, making clean systems critical for compliance.
Additionally, efficient and longer lasting filtration systems significantly reduce any waste generation and contribute to increased sustainable maintenance practices. Extended-life filtration solutions can reduce filter disposal and maintenance waste by 15 to 20 per cent. Smart and efficient filtration in this case plays an important role in meeting the both regulatory and environmental objectives within the industry.
Advancements in filtration technology
Over the years, there has been a significant evolution in the filtration technology to meet the modern industrial applications.
Key developments include:
• High-efficiency filtration media capable of capturing very fine particles without restricting flow
• Compact and integrated designs that combine multiple filtration functions
• Extended service life solutions that reduce replacement frequency and maintenance downtime
• Application-specific engineering tailored to different stages of cement operations
Modern multi-layer filtration media can improve dust-holding capacity by up to two to three times compared to conventional systems, while maintaining consistent performance. These advancements have transformed filtration from a basic maintenance component into a critical performance system.
Adapting to diverse operating conditions
The cement industry of India operates across diverse geographies. Spanning across regions with arid regions with higher dust levels, to the coastal areas with higher humidity, challenges of each region pose different threats to the engines. Modern filtration systems are thus tailored to address these unique challenges of each region.
Indian operating environments often range from 0°C to over 50°C, with some of the highest dust loads globally in mining zones.
Additionally, filtration technology can also be customised to variations which then align the system design with factors like dust load, temperature, and equipment usage patterns. Equipment utilisation levels in India are typically higher than global averages, making robust filtration even more critical. This approach ensures optimal performance and durability across different operational contexts.
Impact on total cost of ownership
Filtration has a direct and measurable impact on the total cost of ownership of equipment.
Effective filtration leads to:
• Lower wear and tear on critical components
• Reduced maintenance and repair costs
• Improved fuel efficiency
• Extended equipment life
• Higher operational uptime
Effective filtration can extend engine life by 20 to 30 per cent and reduce overall maintenance costs by 15 to 25 per cent over the equipment lifecycle. These benefits collectively enhance productivity and reduce lifecycle costs. Conversely, inadequate filtration can result in frequent breakdowns, increased maintenance expenditure, and reduced asset utilisation.
Building a more efficient cement ecosystem
With the rising demand across various sectors, the cement industry is expected to expand at an unprecedented rate. This growth is forcing the production to move towards a more efficient and resilient system of operations. This requires attention not only to production technologies but also to the supporting systems that enable consistent performance. Filtration must be viewed as a strategic investment rather than a routine consumable. By ensuring the cleanliness of air and fluids across systems, it supports reliability, efficiency, and sustainability.
The road ahead
The future of cement logistics will be shaped by increasing mechanisation, digital monitoring, and stricter environmental standards. The industry is also witnessing a shift towards predictive maintenance and condition monitoring, where filtration performance is increasingly integrated with real-time equipment diagnostics.
In this evolving landscape, the role of filtration will become even more critical. As equipment becomes more advanced and operating conditions more demanding, the need for precise contamination control will continue to grow. From quarry to construction site, filtration technology underpins the performance of every critical system. It enables equipment to operate efficiently, reduces operational risks, and supports the industry’s broader goals of growth and sustainability. In many ways, it is the unseen force that keeps the cement ecosystem moving, quietly ensuring that every link in the value chain performs as expected.
About the author
Niranjan Kirloskar, Managing Director, Fleetguard Filters, is focused on driving innovation, operational excellence, and long-term business growth through strategic and people-centric leadership. With a strong foundation in ethics and forward-thinking decision-making, he champions a culture of collaboration, accountability, and technological advancement.
Jignesh Kindaria highlights how Thermal Substitution Rate (TSR) is emerging as a critical lever for cost savings, decarbonisation and competitive advantage in the cement industry.
India is simultaneously grappling with two crises: a mounting waste emergency and an urgent need to decarbonise its most carbon-intensive industries. The cement sector, the second-largest in the world and the backbone of the nation’s infrastructure ambitions, sits at the centre of both. It consumes enormous quantities of fossil fuel, and it has the technical capacity to consume something else entirely: the waste our cities cannot get rid of.
According to CPCB and NITI Aayog projections, India generates approximately 62.4 million tonnes of municipal solid waste annually, with that figure expected to reach 165 million tonnes by 2030. Much of this waste is energy-rich and non-recyclable. At the same time, cement kilns operate at material temperatures of approximately 1,450 degrees Celsius, with gas temperatures reaching 2,000 degrees. This high-temperature environment is ideal for co-processing, ensuring the complete thermal destruction of organic compounds without generating toxic residues. The physics are in our favour. The infrastructure is not.
Pre-processing is not the support act for co-processing. It is the main event. Get the particle size wrong, get the moisture wrong, get the calorific value wrong and your kiln thermal stability will suffer the consequences.
The regulatory push is real
The Solid Waste Management (SWM) Rules 2026 mandate that cement plants progressively replace solid fossil fuels with Refuse-Derived Fuel (RDF), starting at a 5 per cent baseline and scaling to 15 per cent within six years. NITI Aayog’s 2026 Roadmap for Cement Sector Decarbonisation targets 20 to 25 per cent Thermal Substitution Rate (TSR) by 2030. Beyond compliance, every tonne of coal replaced by RDF generates measurable carbon reductions which is monetisable under India’s emerging Carbon Credit Trading Scheme (CCTS). TSR is no longer a sustainability metric. It is a financial lever.
Yet our own field assessments across multiple Indian cement plants reveal a sobering reality: the primary barrier to scaling AFR adoption is not waste availability. It is the fragmented and under-engineered pre-processing ecosystem that sits between the waste and the kiln.
Why Indian waste is a different engineering problem
Indian municipal solid waste is not the material that imported shredding equipment was designed for. Our waste streams frequently exceed 40 per cent to 50 per cent moisture content, particularly during monsoon cycles, saturated with abrasive inerts including sand, glass, and stone. Plants relying on imported OEM equipment face months of downtime awaiting proprietary spare parts. Machines built for segregated, low-moisture waste fail quickly and disrupt the entire pre-processing operation in Indian conditions.
The two most common failures we observe are what I call the biting teeth problem and the chewing teeth problem. Plants relying solely on a primary shredder reduce bulk waste to large fractions, but the output remains too coarse for stable kiln combustion. Others attempt to use a secondary shredder as a standalone unit without a primary stage to pre-size the feed, leading to catastrophic mechanical failure. When both stages are present but mismatched in throughput capacity, the system becomes a bottleneck. Achieving the 40 to 70 tonnes per hour required for meaningful coal displacement demands a precisely coordinated two-stage process.
Engineering a made-in-India answer
At Fornnax, our response to these challenges is grounded in one principle: Indian waste demands Indian engineering. Our systems are built around feedstock homogeneity, the holy grail of kiln stability. Consistent particle size and predictable calorific value are the foundation of stable kiln combustion. Without them, no TSR target is achievable at scale.
Our SR-MAX2500 Dual Shaft Primary Shredder (Hydraulic Drive) processes raw, baled, or loosely mixed MSW, C&I waste, bulky waste, and plastics, reducing them to approximately 150 mm fractions at throughputs of up to 40 tonnes per hour. The R-MAX 3300 Single Shaft Secondary Shredder (Hydraulic Drive), introduced in 2025, takes that primary output and produces RDF fractions in the 30 to 80 mm range at up to 30 tonnes per hour, specifically optimised for consistent kiln feeding. We have also introduced electric drive configurations under the SR-100 HD series, with capacities between 5 and 40 tonnes per hour, already operational at a leading Indian waste-processing facility.
Looking ahead, Fornnax is expanding its portfolio with the upcoming SR-MAX3600 Hydraulic Drive primary shredder at up to 70 tonnes per hour and the R-MAX2100 Hydraulic drive secondary shredder at up to 20 tonnes per hour, designed specifically for the large-scale throughput that higher TSR ambitions require.
The investment case is now
The 2070 Net-Zero target is not a distant goal for India’s cement sector. It starts today, with decisions being made on the plant floor.
The SWM Rules 2026 are already in effect, requiring cement plants to replace coal with RDF. Carbon credit markets are opening up, and coal prices are not going to get cheaper. Every tonne of coal a cement plant replaces with waste-derived fuel saves money on one side and generates carbon credit revenue on the other. Pre-processing infrastructure is no longer just a compliance requirement. It is a business investment with a measurable return.
The good news is that nothing is missing. The technology works. The waste is available in every Indian city. The government has provided the policy direction. The only thing standing between where the industry is today and where it needs to be is the commitment to build the right infrastructure.
The cement companies that move now will not just meet the regulations. They will be ahead of every competitor that waits.
About the author
Jignesh Kundaria is the Director and CEO of Fornnax Technology. Over an experience spanning more than two decades in the recycling industry, he has established himself as one of India’s foremost voices on waste-to-fuel technology and alternative fuel infrastructure.
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