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Maximising AFR in Cement Manufacturing

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Shreesh A Khadilkar, Consultant and Advisor, and Former Director Quality and Product Development, ACC Ltd Thane, discusses the importance of optimising the use of alternative fuel and raw materials (TSR percentage) in cement production without affecting clinker quality, in part one of this two-part series.

Over the past decade or so, the Indian cement industry has made significant progress in terms of improvement in energy efficiency and productivity. However, the use of alternative fuel and raw material (AFR) to replace coal for thermal energy needs, remains an area where the Indian cement industry is yet to catch up with global benchmarks. Though a few cement plants co-process large quantities and varieties of AFR in their kilns, and are reported to reach a level of around 40 per cent Thermal Substitution Rate (TSR), many plants are still at much lower levels of TSR percentage.
Most of the cement plants have now installed co-processing facilities or are on the verge of having one. Some of the plants also have pre-processing facilities, which could include shredding, segregation, impregnation, foreign body removal etc., while some others source a pre-processed solid AFR (RDF, MSW, Industrial waste sludges, agro wastes etc.).
This article shares important aspects such as assessment of clinker quality in plant clinker quality optimisation, influence of alkalis, chlorides and SO3, effects of some important minor constituents and subsequently discusses the concept for maximising AFR (TSR percentage) without affecting clinker quality through with or without use of XRD technique for in process control. The author further recommends bi-hourly quality and in process dashboard for consistent kiln performance and consistent clinker quality.

Assessment of Clinker Quality
The clinker quality assessment can best be done by Lab Ball Mill grinding of day average clinker with mineral gypsum (with SO3 of the lab ground cement targeted at 2.2 to 2.4 with fixed grinding time to achieve Blaine’s of around 300-320 M2/kg with the residue on 45 microns of the cement in range of 18 per cent to 20 per cent, at this fineness, the clinker is observed to clearly depict changes in clinker reactivity in terms of changes in 1 Day strengths of cements (± 3 to 5 MPa). At lower grinding Blaine’s (of around 250 M2/kg), which is presently being practiced by many cement plants, one does not observe the changes in clinker reactivity, as the difference of 1 Day compressive strengths is only ± 1 MPa, which does not show the changes in clinker reactivity.
Typically, clinkers with good reactivity are observed to show 1 Day strengths in lab ground cements of 30 to 35 MPa. Higher values being observed when clinker alkali sulphates are high (especially with Petcoke as fuel), the achieved Blaine’s and quantity of nibs removed from the lab ground cement, in the fixed grinding time is also indicative of clinker grindability. Judicious raw mix optimisation with existing or alternative corrective materials (with the fuel mix used by the plant) can be attempted so as to have a clinker with improved reactivity/hydraulic potential. In a running plant the approach has to be by attempting small gradual changes to clinker composition and assessing the impact of the changes, on kiln performance and clinker quantity.
The changes to be attempted could be indicated through data analysis.
In each plant, the QC and process has detailed analysis data of the day average clinkers along with its lab ground cement test results. It is also suggested to test at least one spot clinker per day for chemical parameters and physical tests of lab ground cement. From the analysis data it could be observed that on some days the lab ground cements show much higher strengths. Why on some days or in some spot clinkers, the clinker reactivity is suddenly very good? Such clinkers should be preserved and evaluated by XRD, so as to identify the optimum clinker composition which shows higher reactivity. Such an evaluation could also indicate at times the impact of changes in fuel / sources of coal / proportions of coal and Petcoke (even source of Petcoke) / solid AFR usage levels.
Typically, the target clinker composition to give a good hydraulic potential would be with LSF of 93 to 95 with a bogues potential C3S of >55 per cent clinker (especially with Petcoke as main fuel in fuel mix), with C3A (6.5 per cent to 8.5 per cent) if the clinker is used for PPC/PSC and also for OPC (especially if OPC is supplied to RMX customers) and SM 2.2 to 2.4 A/F 1.2 to 1.4. In plants where clinker MgO is higher (> 4.5 per cent), besides having the LSF target of around 93 to 95, the minimum clinker lime targeted should be such to have C/S ratio of 2.95 to 3.1 for having good clinker reactivity in spite of high clinker MgO.

Co-Processing of AFR (Liquid AFR /Solid AFR)
The properties of AF(R) co-processed in the calciner have an impact on environment, health and safety, plant operations and product quality as shown in Table 1:

  • Alkalis without sulphidisation: Formation of orthorhombic C3A, fast setting
  • Alkali sulphates (Na2SO4, K2SO4, 2CaSO4.K2SO4 or even Ca-langebnite): Increased early strength, usually shows decrease of later age strengths. Changes must be accounted for in gypsum optimisation
  • Excess of sulphur over alkalis
  • Integration of SO3 in C2S and/or formation of CaSO4
  • Possible reduction of final strength could be observed
  • Reduces the CaO availability for C3S formation
  • The clinker could be harder to grand
  • Changes the Clinker Liquid Characteristics which affects the phase formations
  • Chlorides tend to be higher in AFR liquid/solid, the control on chlorides is necessary to prevent inlet/cyclone jamming and to have < 0.06 per cent in clinker, so that the OPC has <0.04 per cent chlorides and is suitable for
  • RMC/structural concrete. To avoid problems of kiln inlet and cyclone jamming caused by SO3 and Cl. Preferably maintain the Hot Meal (2 Cl + SO3) < 3.5. The threshold value for a given plant needs to
    be assessed.

If the value goes above the plant threshold value, immediate actions of adding caustic soda for 2 to 3 shifts (in small polyethene bags) should be done to remove the depositions and avoid kiln stoppage.

Effects of some minor constituents on the clinker quality

Effects of ZnO

  • Zinc in clinker nearly distributes evenly between the silicates ad matrix phases (with preference to ferrite), trigonal C3S and ß C2S is stabilised by zinc.
  • Presence of zinc reduces the amount of aluminates in favour of alumino ferrite.
  • Each 1 per cent zinc reduces aluminates by
    1 per cent and increases alumino-ferrites by
    2 per cent.
  • Zinc is very effective flux and mineraliser, it lowers clinkerisation temperatures and accelerates lime combination. Knofel reports increased comp. strengths by up to 20 per cent and above at early ages.

Effects of TiO2

  • The clinker TiO2 should be <0.7 per cent, it should be noted that TiO2 is a viscous flux like Al2O3 and so for understanding the clinker liquid property for good C3S formation and based on the kiln conditions adjust the clinker Fe2O3 contents accordingly.
  • At higher TiO2, contents for improved kiln conditions the clinker Fe2O3 content needs to be much higher which is aggravated if clinker SO3 is higher (which also affects the viscosity of clinker liquid)
  • At high total liquid the clinker becomes silica deficient and so free lime tends to be higher (with clinker balls with calcined un sintered material inside)
  • In plants that use red mud especially with petcoke due to its higher alkalis, many sources of red muds also have TiO2, the plant should target Al2O3 + TiO2 as the viscous flux and then adjust the clinker Fe2O3 to get good kiln conditions as indicated above. Targeting higher liquid only increases the limestone LSF from mines and also affects clinker grindability.

Effects P2O5 sources

  • Many types of agriculture waste, biowastes, phosphate sludge, paint sludges, medical waste, RDF/municipal solid waste, expired detergent, cow dung cakes, etc.
  • Under Indian conditions of clinker phase composition, any increase of P2O5 contents can substantially affect clinker quality.
  • When higher P2O5 are present, the dicalcium silicate (C2S) is stabilised and inhibits formation of alite (C3S) i.e can decrease the percentage of C3S although bogue may show high percentage C3S.
  • When P2O5 present exceeds 0.4 per cent in the clinker it reduces the percentage of C3S by 10 per cent and 1 Day Comp. Strengths by around 5-6 MPa with negative effects on clinker reactivity and setting of cement.
  • Use of wastes containing phosphates in controlled manner so that P2O5 in the clinker (maximum limit in clinker is 0.25 per cent) can enhance the use of agricultural waste or use of other wastes with P2O5. It may be noted that in some regions limestone and laterite also have shown P2O5 contents.
  • In some plants up to 5 to 7 per cent TSR there is no impact observed on quality or productivity, however as the TSR/AFR percentage is increased say above >8 per cent to 10 per cent, the kiln conditions get frequently disturbed with a very high dust generation and there is a drop in clinker reactivity/quality.

In the plants a judicious study of process conditions and understanding the burnability of kiln feed could help achieve productivity without affecting the clinker quality with increased AFR/TSR.

In one of my consultancy visits to an integrated plant, similar observations as above were reported. In a brainstorming discussions with the plant process, production and QC teams, it was noted that:

  • There was substantial variation in calciner outlet/kiln inlet material/C6 material temperature it fluctuated from around 920oC to as low as 860oC, these changes in temperatures nearly corresponded with the fluctuation in percentage of moisture and feed rate of solid AFR (SAFR), RDF and other solid wastes.
  • The kiln torque decreased below the desired levels, when the calciner outlet and kiln inlet material temperatures (in this case C6 material temperatures) were less than 890oC and the kiln performance showed high dust recirculation/generation.
  • The bi-hourly XRF analysis of clinker showed lower LSF/high free lime. The decrease in clinker LSF was understandable as the SAFR ash showed a higher percentage of ash.

It was decided to collect hot meal samples 900oC to 910oC and 920oC to 930oC and also corresponding clinker samples collected after 40 minutes of the sample collection time of hot meal samples. The hot meal samples were analysed for XRD and clinker samples for XRF (Chemical analysis with free lime) and XRD (for clinker phase formation).
The XRD analysis of hot meal samples is shown in Table 2.
The XRD analysis indicates that:

  • The calcination percentage is much higher than the convention DOC of hot meal samples.
  • The un-combined CaO decreases with increase in temperature of collected sample.
  • The total belite increases with increase in temperature.

It was observed in the plant that when attempts were made to maintain the kiln inlet material temperature at 910oC to 920oC, the kiln torque showed an improvement and the kiln performance improved. The clinker quality showed improvements with lower free lime. However due to the fluctuations in ash percentage content of SAFR the clinker LSF showed lower values during the day. As a corrective action, lime sludge (available at the plant) was added on the SAFR conveyor. These corrective actions helped achieve a consistent improved clinker quality.

About the author:
With an MSc in Organic Chemistry from Jodhpur University (now JNV University), Shreesh Khadilkar joined ACC’s Organic Chemical Product Development Division in 1981 and later transitioned to the Cement R&D Division as a technical assistant. He took over as VP of R&D (Quality and Product Development Division) and retired as Director of the department in 2018, with over 37 years of experience in cement manufacturing and cements/cementitious products.

Economy & Market

SEW-EURODRIVE India Opens Drive Technology Centre in Chennai

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The new facility strengthens SEW-EURODRIVE India’s manufacturing, assembly and service capabilities

SEW-EURODRIVE India has inaugurated a new Drive Technology Centre (DTC) in Chennai, marking a significant expansion of its manufacturing and service infrastructure in South India. The facility is positioned to enhance the company’s responsiveness and long-term support capabilities for customers across southern and eastern regions of the country.

Built across 12.27 acres, the facility includes a 21,350-square-metre assembly and service setup designed to support future industrial growth, evolving application requirements and capacity expansion. The centre reflects the company’s long-term strategy in India, combining global engineering practices with local manufacturing and service capabilities.

The new facility has been developed in line with green building standards and incorporates sustainable features such as natural daylight utilisation, solar power generation and rainwater harvesting systems. The company has also implemented energy-efficient construction and advanced climate control systems that help reduce shopfloor temperatures by up to 3°C, improving production stability, product quality and working conditions.

A key highlight of the centre is the 15,000-square-metre assembly shop, which features digitisation-ready assembly cells based on a single-piece flow manufacturing concept. The facility also houses SEW-EURODRIVE India’s first semi-automated painting booth, aimed at ensuring uniform surface finish and improving production throughput.

With the commissioning of the Chennai Drive Technology Centre, SEW-EURODRIVE India continues to strengthen its manufacturing footprint and reinforces its long-term commitment to supporting industrial growth and automation development in India.

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Concrete

Material Flow Efficiency

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We explore how material handling systems are becoming strategic assets in cement plants, enabling efficient movement of raw materials, clinker and finished cement. Advanced conveying, automation and digital technologies are improving plant productivity while supporting energy efficiency and sustainability goals.

Material handling systems form the operational backbone of cement plants, enabling the efficient movement of raw materials, clinker and finished cement across complex production networks. With India’s cement industry producing over 391 million tonnes of cement in FY2024 and possessing an installed capacity of around 668 mtpa, according to the CRISIL Research Industry Report, 2025, efficient material logistics have become critical to maintaining plant productivity and cost competitiveness. At the same time, cement production is highly energy intensive and contributes around 7 per cent to
8 per cent of global CO2 emissions, making efficient material flow and logistics optimisation essential for reducing operational inefficiencies and emissions states the International Energy Agency Cement Technology Roadmap, 2023. As plants scale capacity and integrate digital technologies, modern material handling systems, ranging from automated conveyors to intelligent stockyards, are increasingly recognised as strategic assets that influence plant stability, energy efficiency and environmental performance.

Strategic role of material handling
Material handling is no longer viewed as a secondary utility within cement plants; it is now recognised as a strategic system that directly influences production efficiency and process stability.
Cement manufacturing involves the continuous movement of large volumes of limestone, clay, additives, clinker and finished cement across multiple production stages. Even minor disruptions in conveying systems or storage infrastructure can lead to kiln feed fluctuations, production delays and significant financial losses. According to Indian Cement Industry Operational Benchmarking Study, 2024, unplanned downtime in large integrated cement plants can cost between Rs.15–20 lakh per hour, highlighting the economic importance of reliable material handling systems.
Modern cement plants are therefore investing in advanced mechanical handling systems designed for high throughput and operational reliability. Large integrated plants can process over 10,000 tonnes per day of clinker, requiring highly efficient conveying systems and automated stockyards to maintain continuous material flow, suggests the International Cement Review Industry Analysis, 2024. Efficient material handling also reduces spillage, minimises dust emissions and improves workplace safety. As cement plants become larger and more technologically advanced, the role of material handling is evolving from simple transport infrastructure to a critical operational system that supports both productivity and sustainability.

From quarry to plant
The transport of raw materials from quarry to processing plant represents one of the most energy-intensive stages of cement production. Traditionally, limestone and other raw materials were transported using diesel-powered trucks, which resulted in high fuel consumption, dust generation and increased operational costs. However, modern plants are increasingly adopting long-distance belt conveyors and pipe conveyors as a more efficient alternative. These systems allow continuous material transport over distances of 10–15 kilometres, significantly reducing fuel consumption and operating costs while improving environmental performance, states the FLSmidth Cement Industry Technology Report, 2024.
Milind Khangan, Marketing Manager, Vertex Market Research & Consulting, says, “Efficient and enclosed handling of fine materials such as cement, fly ash and slag requires modern pneumatic conveying systems. By optimising the air-to-material ratio, these systems can reduce energy consumption by 10 per cent to 15 per cent while ensuring smooth material flow. Closed-loop conveying further minimises dust loading and improves the performance of bag filters, supporting cleaner plant operations. In addition, flow-regulated conveying lines help prevent clogging and maintain reliable dispatch performance. Overall, automation in pneumatic conveying delivers immediate operational benefits, including improved equipment uptime, lower energy use, reduced material spillage and more stable kiln and mill performance.”
Pipe conveyor systems are particularly gaining traction because they provide a completely enclosed transport system that prevents material spillage and dust emissions. According to global cement engineering studies, conveyor-based transport can reduce energy consumption by up to 30 per cent compared to truck haulage, while also improving operational reliability. Several cement plants in India have already implemented such systems to stabilise quarry-to-plant logistics while reducing carbon emissions associated with diesel transport.

Stockyard management and homogenisation
Stockyards play a critical role in maintaining raw material consistency and stabilising kiln feed quality. Modern cement plants use advanced stacker and reclaimer systems to ensure efficient storage and blending of raw materials before they enter the grinding and pyroprocessing stages. Automated stacking methods such as chevron or windrow stacking enable uniform distribution of materials, while bridge-type or portal reclaimers ensure consistent extraction during kiln feed preparation. These systems are essential for maintaining stable chemical composition of raw meal, which directly influences kiln efficiency and clinker quality. The Cement Plant Operations Handbook, 2024 indicates that advanced homogenisation systems can reduce raw mix variability by up to 50 per cent, significantly improving kiln stability and energy efficiency. Integrated stockyard management systems also incorporate sensors for monitoring bulk density, moisture levels and stockpile volumes, enabling real-time control over material blending processes.

Clinker and cement conveying technologies
Once clinker is produced in the kiln, it must be efficiently transported to storage silos and subsequently to grinding and packing units. Modern cement plants rely on high-capacity belt conveyors, bucket elevators and pneumatic conveying systems to manage this stage of material flow. Steel-cord belt bucket elevators are now capable of lifting materials to heights exceeding 120 metres with capacities reaching 1,500 tonnes per hour, making them suitable for large-scale clinker production lines, states the European Cement Engineering Association Technical Paper, 2023.
For fine materials such as cement, fly ash and slag, pneumatic conveying systems provide a reliable and dust-free solution. These systems transport powdered materials using controlled airflow, ensuring enclosed and contamination-free movement between grinding units, silos and packing stations. Optimised pneumatic systems can reduce energy consumption by 10 per cent to 15 per cent compared to older conveying technologies, while also improving plant cleanliness and environmental compliance, according to the Global Cement Technology Review, 2024.

Automation and digitalisation
Digitalisation is transforming material handling systems by introducing real-time monitoring, predictive maintenance and automated control. Advanced sensors and Industrial Internet of Things (IIoT) platforms enable plant operators to track conveyor health, stockpile levels and equipment performance in real time. Predictive maintenance systems analyse vibration patterns, temperature fluctuations and equipment load data to detect potential failures before they occur. According to McKinsey’s Industry 4.0 Manufacturing Report, 2023, for heavy industries, digital monitoring and predictive maintenance technologies can reduce equipment downtime by up to 30 per cent and increase productivity by 10 per cent to 15 per cent. Digital control centres also integrate data from conveyors, stacker reclaimers and dispatch systems, enabling centralised management of material flows from quarry to dispatch.

Handling of AFR
The growing adoption of Alternative Fuels and Raw Materials (AFR) has introduced new challenges and opportunities for material handling systems in cement plants. AFR materials such as refuse-derived fuel (RDF), biomass and industrial waste often have irregular particle sizes, variable moisture content and lower bulk density compared to conventional fuels. As a result, specialised storage, dosing and feeding systems are required to ensure consistent kiln combustion. According to the Cement Sector Decarbonisation Roadmap published by NITI Aayog in 2026, increasing the use of AFR could enable India’s cement sector to achieve thermal substitution rates of around 20 per cent in the coming decades. To support this transition, plants are investing in automated receiving stations, shredding units, drying systems and precision dosing equipment to stabilise AFR supply and combustion performance.

Energy efficiency and dust control
Material handling systems also play a crucial role in improving plant energy efficiency and environmental performance. Modern conveyor systems equipped with variable speed drives and energy-efficient motors can significantly reduce electricity consumption. Permanent magnet motors used in conveyor drives can deliver 8 per cent to 12 per cent energy savings compared to conventional induction motors, improving overall plant energy efficiency according to the IEA Industrial Energy Efficiency Study, 2023. Dust control is another major concern in cement plants, particularly during material transfer and storage operations. Enclosed conveyors, dust extraction systems and advanced bag filters are widely used to minimise particulate emissions and improve workplace safety.

Future trends in material handling
The future of material handling in cement plants will be shaped by automation, digitalisation and sustainability considerations. Emerging technologies such as AI-driven logistics optimisation, autonomous mobile equipment and digital twins are expected to further improve plant efficiency and operational visibility. Digital twin models allow engineers to simulate material flow patterns, optimise stockyard operations and predict equipment performance under different operating conditions. According to the International Energy Agency Digitalisation and Energy Report, 2024, the adoption of advanced digital technologies could improve industrial energy efficiency by up to 20 per cent in heavy industries such as cement manufacturing. As cement plants expand capacity and adopt low-carbon technologies, intelligent material handling systems will play a critical role in maintaining productivity and reducing environmental impact.

Conclusion
Material handling systems have evolved from basic transport infrastructure into strategic operational systems that directly influence plant efficiency, reliability and sustainability. From quarry transport and automated stockyards to digital dispatch platforms and advanced conveying technologies, modern material handling solutions enable cement plants to manage large production volumes while maintaining process stability.
As India’s cement industry continues to expand to meet infrastructure and urban development demands, investments in advanced material handling technologies will become increasingly important. By integrating automation, digital monitoring and energy-efficient systems, cement manufacturers can improve operational performance while supporting the industry’s long-term sustainability and decarbonisation goals.

  • Kanika Mathur

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Concrete

Modernise to Optimise

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Cement plant modernisation is reshaping the industry through upgrades in
kilns, energy systems, digitalisation, AFR integration and advanced material
handling. We explore these technologies that improve efficiency, reduce
emissions, strengthen competitiveness, while preparing the industry for India’s
next phase of infrastructure growth.

India’s cement industry, the world’s second-largest, is undergoing a rapid transformation driven by infrastructure demand, decarbonisation targets and technological advancement. The sector’s installed capacity stood at approximately 668 million tonnes per annum (mtpa) in FY2025 and is projected to reach 915–925 mtap by 2030, supported by large-scale capacity expansions and infrastructure investment cycles, suggests CRISIL Intelligence Industry Report, 2025. At the same time, cement production remains highly energy intensive and contributes about 6 per cent to 7 per cent of India’s total greenhouse gas emissions, making efficiency improvements and modernisation critical for long-term sustainability as stated in CareEdge ESG Research, 2025. As a result, cement manufacturers are investing in advanced kiln technologies, digital monitoring systems, waste heat recovery, alternative fuels, and modern material handling infrastructure to enhance productivity while aligning with global decarbonisation pathways.

Need for modernisation
The need for plant modernisation is closely linked to the sector’s rapid capacity expansion and rising operational complexity. India’s installed cement capacity has grown significantly in the last decade and is expected to exceed 900 mtpa by 2030, driven by demand from housing, infrastructure and urban development projects, as per the CRISIL Intelligence Industry Report, 2025. However, increasing scale also places pressure on energy efficiency, logistics, and production stability. The report also suggests that the cement plants must upgrade equipment and processes to operate at higher utilisation rates, which are projected to reach 75 per cent to 77 per cent by the end of the decade, compared to around 72 per cent to 74 per cent in FY2026.
Environmental imperatives are another major driver of modernisation. Cement manufacturing is responsible for a significant share of industrial emissions because clinker production requires high-temperature processes that depend heavily on fossil fuels. According to CareEdge ESG research, the cement sector contributes 6–7 per cent of India’s total greenhouse gas emissions, with approximately 97 per cent of emissions arising from direct fuel combustion and process emissions in kilns. Consequently, plant modernisation initiatives now focus not only on productivity improvements but also on reducing emissions intensity, energy consumption, and reliance on conventional fuels.
“One of the most impactful upgrades implemented at Shree Cement in the last five years has been the adoption of advanced data management platforms that provide real-time visibility across major process areas. This digital advancement has strengthened plant automation by enabling faster and more accurate responses to process variations while improving the reliability of control loops. Real-time dashboards, integrated analytics and automated alerts now support quicker, data-driven decision-making, helping optimise kiln and mill performance, improve energy control and detect deviations early. By consolidating data from multiple systems into a unified digital environment, the company has enhanced operational consistency, reduced downtime and improved both productivity and compliance. This shift towards intelligent automation and real-time data management has become a key driver of operational excellence and future-ready plant management,” says Satish Maheshwari, Chief Manufacturing Officer, Shree Cement.

Kiln and pyroprocessing upgradation
The kiln remains the technological heart of cement manufacturing, and modernisation efforts often begin with upgrades to pyroprocessing systems. Many older plants in India operate with four- or five-stage preheaters, while modern plants increasingly adopt six-stage preheater and pre-calciner systems that significantly improve heat efficiency and clinker output. These systems enhance heat transfer, reduce fuel consumption, and stabilise kiln operations under high throughput conditions.
Professor Procyon Mukherjee suggests, “Cement manufacturing is, at its core, a thermal process. The rotary kiln and calciner together account for energy consumption and emissions. The theoretical thermal requirement for clinker production is around 1700–1800 MJ per tonne, yet real-world plants often operate far above this benchmark due to inefficiencies in combustion, heat recovery and material flow. Modernisation, therefore, must begin with the
kiln system, and not peripheral automation or
isolated upgrades. The shift from wet to dry process kilns, combined with multi-stage preheaters and precalciners, has already delivered step-change improvements, making dry kilns nearly 50 per cent more energy efficient.”
Recent investment programmes across the industry have included kiln cooler upgrades, advanced burners, and improved refractory materials designed to increase operational reliability and reduce specific heat consumption. Such upgrades are essential because cement production remains highly energy intensive, and continuous efficiency improvements are required to meet global decarbonisation targets. According to the International Energy Agency (IEA) Cement Tracking Report, 2023, the cement sector must achieve annual emissions intensity reductions of around 4 per cent through 2030 to align with global net-zero scenarios.

Energy efficiency and WHRS
Energy efficiency remains one of the most important areas of modernisation in cement manufacturing, given the sector’s heavy reliance on thermal and electrical energy. Modern plants deploy advanced process controls, efficient grinding systems, and improved combustion technologies to reduce specific energy consumption. The adoption of energy-efficient technologies is particularly important in India, where energy costs account for a large share of production expenses. As demand grows and plants expand capacity, improving energy performance becomes essential to maintain competitiveness.
Waste Heat Recovery Systems (WHRS) have emerged as a key solution for improving plant energy efficiency. During cement production, large volumes of high-temperature gases are released from kilns and coolers. WHRS technology captures this waste heat and converts it into electricity, thereby reducing reliance on external power sources. According to energy benchmarking studies for the Indian cement industry, installed waste heat recovery capacity in the sector has reached approximately 840 MW, with an additional potential of around 500 MW states the Green Business Centre, Energy Benchmarking Report, 2023. Several leading producers have already implemented large WHRS installations; for example, UltraTech Cement has deployed systems with around 121 MW of waste heat recovery capacity, reducing carbon emissions by nearly 0.5 million tonnes annually according to the Energy Alternatives India Case Study, 2024.

Integration of AFR
The integration of Alternative Fuels and Raw Materials (AFR) is another critical dimension of cement plant modernisation. AFR refers to the use of industrial waste, biomass, refuse-derived fuel (RDF), and other non-fossil materials as substitutes for conventional fuels such as coal and petcoke. Increasing the use of AFR helps reduce fossil fuel consumption while simultaneously addressing waste management challenges. According to the NITI Aayog Decarbonisation Roadmap, 2026, scaling the use of RDF and other alternative fuels could enable the sector to achieve thermal substitution rates of around 20 per cent in the coming decades.
However, integrating AFR requires significant plant modifications and operational adjustments. Waste-derived fuels often have inconsistent calorific values, higher moisture content, and heterogeneous physical properties compared to traditional fuels. As a result, modern plants invest in advanced fuel preparation systems, dedicated feeding equipment, and automated dosing technologies to ensure stable kiln operation. These upgrades allow plants to maintain consistent clinker quality while increasing the share of alternative fuels in their energy mix.

Digitalisation and smart plant operations
Digitalisation is rapidly transforming cement plant operations by enabling data-driven decision-making and predictive maintenance. Industry 4.0 technologies such as IoT sensors, artificial intelligence (AI), and advanced analytics are now used to monitor equipment performance, optimise process parameters, and anticipate maintenance requirements. These digital tools enable plant operators to detect early signs of equipment failure, minimise unplanned downtime, and improve operational efficiency. Predictive maintenance systems, for example, analyse vibration, temperature, and acoustic signals from rotating equipment to identify potential faults
before they escalate into major breakdowns. Digital twins and integrated control systems further allow operators to simulate plant performance under different scenarios and optimise production strategies. Such technologies are becoming increasingly important as cement plants operate at larger scales and higher levels of process complexity.
Maheshwari also adds, “Plant modernisation is also increasingly central to the global competitiveness of Indian cement manufacturers. As cost pressures rise across energy, logistics and regulatory compliance, modern plants offer the structural efficiency required to operate reliably and competitively over the long term. Technologies such as AI-driven Advanced Process Control (APC) integrated with real-time data systems are emerging as essential investments for the future. These platforms use predictive algorithms, machine learning and live process inputs to optimise kiln, mill and utility operations with greater precision than traditional control systems. By continuously analysing variations in feed chemistry, temperature profiles, energy demand and equipment behaviour, APC enables stable operations, lower specific energy consumption, reduced emissions and improved product consistency. As regulatory expectations tighten and plants pursue higher efficiency with lower carbon intensity, AI-enabled APC will play a crucial role in strengthening automation, enhancing decision-making and ensuring long-term operational resilience.”

Modern material handling and logistics
Material handling systems play a critical role in ensuring smooth plant operations and efficient logistics. Modern cement plants rely on advanced conveying systems, automated stockyards, and digital dispatch platforms to manage the movement of raw materials, clinker, and finished cement. Long-distance belt conveyors and pipe conveyors are increasingly replacing truck-based transport between quarries and plants, reducing fuel consumption, dust emissions, and operational costs. Automated stacker-reclaimers ensure consistent blending of raw materials,
which improves kiln stability and clinker quality. Meanwhile, advanced packing and dispatch systems equipped with high-speed rotary packers and robotic palletisers enhance throughput and reduce manual labour. These technologies allow cement plants to optimise logistics efficiency while supporting higher production capacities.

Emission control and environmental compliance
Environmental compliance has become a central focus of cement plant modernisation as regulators and investors place greater emphasis on sustainability performance. Modern plants deploy advanced emission control technologies such as high-efficiency bag filters, electrostatic precipitators, and selective non-catalytic reduction systems to reduce particulate matter and nitrogen oxide emissions.
Sine Bogh Skaarup, Vice President, Head of Green Innovation and R&D, Fuller Technologies says, “One of our key focus areas is decarbonisation. We help cement producers reduce CO2 and overall carbon emissions. We offer alternative fuel solutions and calcined clay technologies to enable the production of LC3 cement, which play a significant role in decarbonising the cement industry. By combining alternative fuels and calcined clay solutions, CO2 emissions can be reduced by up to 50 per cent, making this a highly impactful approach for sustainable cement production.”
Continuous emission monitoring systems are increasingly used to track environmental performance in real time and ensure compliance with regulatory standards. In addition to air pollution control, cement companies are also investing in water recycling systems, renewable energy integration, and carbon reduction initiatives. These measures are essential for aligning the sector with national climate goals and improving the environmental footprint of
cement manufacturing.

Economic benefits and future outlook
Beyond environmental and operational advantages, cement plant modernisation also delivers significant economic benefits. Energy efficiency improvements, digital process optimisation, and advanced material handling systems reduce operating costs and improve asset utilisation. Waste heat recovery and alternative fuels help lower fuel expenditure and reduce exposure to volatile fossil fuel markets. As the industry expands capacity to meet growing demand, modernised plants are better positioned to achieve higher productivity and maintain profitability. The long-term outlook for the sector remains positive, with India expected to continue large-scale infrastructure investments in roads, housing, railways, and urban development.
Milan R Trivedi, Vice President – Projects, Prod & QC, MR, Shree Digvijay Cement, says, “The main focus in case of modernisation projects drives through the investment decision, which is mainly based on IRR and impact on overall efficiency improvement, cost optimisation and improvement in reliability. However, there are certain modernisation, which has high impact on environmental impact, statutory requirements, etc. has higher priority irrespective of ROI or payback period.”
“The energy efficiency and reliability investment projects generally provide fast return on investment whereas strategic, digitalisation and environmental investment projects provide long term and compounded benefits. Typical modernisation investment projects are decided with IRR of about > 20 per cent, payback period of typically 2-3 years for fast-track projects,” he adds.
In this context, modernisation will remain a key strategic priority for cement manufacturers seeking to maintain competitiveness in an increasingly sustainability-focused market.

Conclusion
The modernisation of cement plants is no longer a purely technical upgrade but a strategic transformation that reshapes how the industry operates. As India’s cement sector expands capacity toward the next growth cycle, improvements in energy efficiency, digitalisation, alternative fuels and advanced logistics will determine the competitiveness of individual plants. Modern technologies allow producers to operate at higher productivity levels while simultaneously reducing energy consumption and emissions intensity.
Looking ahead, the pace of technological adoption will play a decisive role in shaping the future of
the cement industry. Companies that successfully integrate modern equipment, digital systems, and sustainable production practices will be better positioned to meet rising infrastructure demand while aligning with global climate commitments. In this evolving landscape, plant modernisation stands as the cornerstone of both operational excellence and environmental responsibility.

  • Kanika Mathur

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