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Revival of small scale cement manufacturing

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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.

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Concrete

Fornnax Unveils the World’s Largest NPD and Demo Centre to Accelerate Global Recycling Innovation

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A 12-acre innovation campus enables Fornnax to design, test and validate high-performance recycling solutions at global standards in record time.

Fornnax has launched one of the world’s largest New Product Development (NPD) centres and demo plants, spanning more than 12 acres, marking a major step toward its vision of becoming a global recycling technology leader by 2030. Designed to accelerate real-world innovation, the facility will enable faster product design cycles, large-scale performance validation, and more reliable equipment for high-demand recycling applications.

At the core of the new campus is a live demo plant engineered to support application-specific testing. Fornnax will use this facility to upgrade its entire line of shredders and granulators—enhancing capacity, improving energy efficiency, and reducing downtime. With controlled test environments, machines can be validated for 3,000 to 15,000 hours of operation, ensuring real-world durability and high availability of 18–20 hours per day. This approach gives customers proven performance data before deployment.

“Innovation in product development is the key to becoming a global leader,” said Jignesh Kundariya, Director and CEO of Fornnax. “With this facility, we can design, test and validate new technologies in 6–8 months, compared to 4–5 years in a customer’s plant. Every machine will undergo rigorous Engineering Build (EB) and Manufacturing Build (MB) testing in line with international standards.”

Engineering Excellence Powered by Gate Review Methodology

Fornnax’s NPD framework follows a structured Gate Review Process, ensuring precision and discipline at every step. Projects begin with market research and ideation led by Sales and Marketing, followed by strategic review from the Leadership Team. Detailed engineering is then developed by the Design Team and evaluated by Manufacturing, Service and Safety before approval. A functional prototype is built and tested for 6–8 months, after which the design is optimised for mass production and commercial rollout.

Open-Door Customer Demonstration and Material Testing

The facility features an open-door demonstration model, allowing customers to bring their actual materials and test multiple machines under varied operating conditions. Clients can evaluate performance parameters, compare configurations and make informed purchasing decisions without operational risk.

The centre will also advance research into emerging sectors including E-waste, cables, lithium-ion batteries and niche heterogeneous waste streams. Highly qualified engineering and R&D teams will conduct feasibility studies and performance analysis to develop customised solutions for unfamiliar or challenging materials. This capability reinforces Fornnax’s reputation as a solution-oriented technology provider capable of solving real recycling problems.

Developing Global Recycling Talent

Beyond technology, the facility also houses a comprehensive OEM training centre. It will prepare operators and maintenance technicians for real-world plant conditions. Trainees will gain hands-on experience in assembly, disassembly and grinding operations before deployment at customer sites. Post-training, they will serve as skilled support professionals for Fornnax installations. The company will also deliver corporate training programs for international and domestic clients to enable optimal operation, swift troubleshooting and high-availability performance.

A Roadmap to Capture Global Demand

Fornnax plans to scale its offerings in response to high-growth verticals including Tyre recycling, Municipal Solid Waste (MSW), E-waste, Cable and Aluminium recycling. The company is also preparing solutions for new opportunities such as Auto Shredder Residue (ASR) and Lithium-Ion Battery recovery. With research, training, validation and customer engagement housed under one roof, Fornnax is laying the foundation for the next generation of recycling technologies.

“Our goal is to empower customers with clarity and confidence before they invest,” added Kundariya. “This facility allows them to test their own materials, compare equipment and see real performance. It’s not just about selling machines—it’s about building trust through transparency and delivering solutions that work.”

With this milestone, Fornnax reinforces its long-term commitment to enabling industries worldwide with proven, future-ready recycling solutions rooted in innovation, engineering discipline and customer collaboration.

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Concrete

Balancing Rapid Economic Growth and Climate Action

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Dr Yogendra Kanitkar, VP R&D, and Dr Shirish Kumar Sharma, Assistant Manager R&D, Pi Green Innovations, look at India’s cement industry as it stands at the crossroads of infrastructure expansion and urgent decarbonisation.

The cement industry plays an indispensable role in India’s infrastructure development and economic growth. As the world’s second-largest cement producer after China, India accounts for more than 8 per cent of global cement production, with an output of around 418 million tonnes in 2023–24. It contributes roughly 11 per cent to the input costs of the construction sector, sustains over one million direct jobs, and generates an estimated 20,000 additional downstream jobs for every million tonnes produced. This scale makes cement a critical backbone of the nation’s development. Yet, this vitality comes with a steep environmental price, as cement production contributes nearly 7 per cent of India’s total carbon dioxide (CO2) emissions.
On a global scale, the sector accounts for 8 per cent of anthropogenic CO2 emissions, a figure that underscores the urgency of balancing rapid growth with climate responsibility. A unique challenge lies in the dual nature of cement-related emissions: about 60 per cent stem from calcination of limestone in kilns, while the remaining 40 per cent arise from the combustion of fossil fuels to generate the extreme heat of 1,450°C required for clinker production (TERI 2023; GCCA).
This dilemma is compounded by India’s relatively low per capita consumption of cement at about 300kg per year, compared to the global average of 540kg. The data reveals substantial growth potential as India continues to urbanise and industrialise, yet this projected rise in consumption will inevitably add to greenhouse gas emissions unless urgent measures are taken. The sector is also uniquely constrained by being a high-volume, low-margin business with high capital intensity, leaving limited room to absorb additional costs for decarbonisation technologies.
India has nonetheless made notable progress in improving the carbon efficiency of its cement industry. Between 1996 and 2010, the sector reduced its emissions intensity from 1.12 tonnes of CO2 per ton of cement to 0.719 tonnes—making it one of the most energy-efficient globally. Today, Indian cement plants reach thermal efficiency levels of around 725 kcal/kg of clinker and electrical consumption near 75 kWh per tonne of cement, broadly in line with best global practice (World Cement 2025). However, absolute emissions continue to rise with increasing demand, with the sector emitting around 177 MtCO2 in 2023, about 6 per cent of India’s total fossil fuel and industrial emissions. Without decisive interventions, projections suggest that cement manufacturing emissions in India could rise by 250–500 per cent by mid-century, depending on demand growth (Statista; CEEW).
Recognising this threat, the Government of India has brought the sector under compliance obligations of the Carbon Credit Trading Scheme (CCTS). Cement is one of the designated obligated entities, tasked with meeting aggressive reduction targets over the next two financial years, effectively binding companies to measurable progress toward decarbonisation and creating compliance-driven demand for carbon reduction and trading credits (NITI 2025).
The industry has responded by deploying incremental decarbonisation measures focused on energy efficiency, alternative fuels, and material substitutions. Process optimisation using AI-driven controls and waste heat recovery systems has made many plants among the most efficient worldwide, typically reducing fuel use by 3–8 per cent and cutting emissions by up to 9 per cent. Trials are exploring kiln firing with greener fuels such as hydrogen and natural gas. Limited blends of hydrogen up to 20 per cent are technically feasible, though economics remain unfavourable at present.
Efforts to electrify kilns are gaining international attention. For instance, proprietary technologies have demonstrated the potential of electrified kilns that can reach 1,700°C using renewable electricity, a transformative technology still at the pilot stage. Meanwhile, given that cement manufacturing is also a highly power-intensive industry, several firms are shifting electric grinding operations to renewable energy.
Material substitution represents another key decarbonisation pathway. Blended cements using industrial by-products like fly ash and ground granulated blast furnace slag (GGBS) can significantly reduce the clinker factor, which currently constitutes about 65 per cent in India. GGBS can replace up to 85 per cent of clinker in specific cement grades, though its future availability may fall as steel plants decarbonise and reduce slag generation. Fly ash from coal-fired power stations remains widely used as a low-carbon substitute, but its supply too will shrink as India expands renewable power. Alternative fuels—ranging from biomass to solid waste—further allow reductions in fossil energy dependency, abating up to 24 per cent of emissions according to pilot projects (TERI; CEEW).
Beyond these, Carbon Capture, Utilisation, and Storage (CCUS) technologies are emerging as a critical lever for achieving deep emission cuts, particularly since process emissions are chemically unavoidable. Post-combustion amine scrubbing using solvents like monoethanolamine (MEA) remains the most mature option, with capture efficiencies between 90–99 per cent demonstrated at pilot scale. However, drawbacks include energy penalties that require 15–30 per cent of plant output for solvent regeneration, as well as costs for retrofitting and long-term corrosion management (Heidelberg Materials 2025). Oxyfuel combustion has been tested internationally, producing concentrated CO2-laden flue gas, though the high cost of pure oxygen production impedes deployment in India.
Calcium looping offers another promising pathway, where calcium oxide sorbents absorb CO2 and can be regenerated, but challenges of sorbent degradation and high calcination energy requirements remain barriers (DNV 2024). Experimental approaches like membrane separation and mineral carbonation are advancing in India, with startups piloting systems to mineralise flue gas streams at captive power plants. Besides point-source capture, innovations such as CO2 curing of concrete blocks already show promise, enhancing strength and reducing lifecycle emissions.
Despite progress, several systemic obstacles hinder the mass deployment of CCUS in India’s cement industry. Technology readiness remains a fundamental issue: apart from MEA-based capture, most technologies are not commercially mature in high-volume cement plants. Furthermore, CCUS is costly. Studies by CEEW estimate that achieving net-zero cement in India would require around US$ 334 billion in capital investments and US$ 3 billion annually in operating costs by 2050, potentially raising cement prices between 19–107 per cent. This is particularly problematic for an industry where companies frequently operate at capacity utilisations of only 65–70 per cent and remain locked in fierce price competition (SOIC; CEEW).
Building out transport and storage infrastructure compounds the difficulty, since many cement plants lie far from suitable geological CO2 storage sites. Moreover, retrofitting capture plants onto operational cement production lines adds technical integration struggles, as capture systems must function reliably under the high-particulate and high-temperature environment of cement kilns.
Overcoming these hurdles requires a multi-pronged approach rooted in policy, finance, and global cooperation. Policy support is vital to bridge the cost gap through instruments like production-linked incentives, preferential green cement procurement, tax credits, and carbon pricing mechanisms. Strategic planning to develop shared CO2 transport and storage infrastructure, ideally in industrial clusters, would significantly lower costs and risks. International coordination can also accelerate adoption.
The Global Cement and Concrete Association’s net-zero roadmap provides a collaborative template, while North–South technology transfer offers developing countries access to proven technologies. Financing mechanisms such as blended finance, green bonds tailored for cement decarbonisation and multilateral risk guarantees will reduce capital barriers.
An integrated value-chain approach will be critical. Coordinated development of industrial clusters allows multiple emitters—cement, steel, and chemicals—to share common CO2 infrastructure, enabling economies of scale and lowering unit capture costs. Public–private partnerships can further pool resources to build this ecosystem. Ultimately, decarbonisation is neither optional nor niche for Indian cement. It is an imperative driven by India’s growth trajectory, environmental sustainability commitments, and changing global markets where carbon intensity will define trade competitiveness.
With compliance obligations already mandated under CCTS, the cement industry must accelerate decarbonisation rapidly over the next two years to meet binding reduction targets. The challenge is to balance industrial development with ambitious climate goals, securing both economic resilience and ecological sustainability. The pathway forward depends on decisive governmental support, cross-sectoral innovation, global solidarity, and forward-looking corporate action. The industry’s future lies in reframing decarbonisation not as a burden but as an investment in competitiveness, climate alignment and social responsibility.

References

  • Infomerics, “Indian Cement Industry Outlook 2024,” Nov 2024.
  • TERI & GCCA India, “Decarbonisation Roadmap for the Indian Cement Industry,” 2023.
  • UN Press Release, GA/EF/3516, “Global Resource Efficiency and Cement.”
  • World Cement, “India in Focus: Energy Efficiency Gains,” 2025.
  • Statista, “CO2 Emissions from Cement Manufacturing 2023.”
  • Heidelberg Materials, Press Release, June 18, 2025.
  • CaptureMap, “Cement Carbon Capture Technologies,” 2024.
  • DNV, “Emerging Carbon Capture Techniques in Cement Plants,” 2024.
  • LEILAC Project, News Releases, 2024–25.
  • PMC (NCBI), “Membrane-Based CO2 Capture in Cement Plants,” 2024.
  • Nature, “Carbon Capture Utilization in Cement and Concrete,” 2024.
  • ACS Industrial Engineering & Chemistry Research, “CCUS Integration in Cement Plants,” 2024.
  • CEEW, “How Can India Decarbonise for a Net-Zero Cement Industry?” (2025).
  • SOIC, “India’s Cement Industry Growth Story,” 2025.
  • MDPI, “Processes: Challenges for CCUS Deployment in Cement,” 2024.
  • NITI Aayog, “CCUS in Indian Cement Sector: Policy Gaps & Way Forward,” 2025.

ABOUT THE AUTHOR:
Dr Yogendra Kanitkar, Vice President R&D, Pi Green Innovations, drives sustainable change through advanced CCUS technologies and its pioneering NetZero Machine, delivering real decarbonisation solutions for hard-to-abate sectors.

Dr Shirish Kumar Sharma, Assitant Manager R&D, Pi Green Innovations, specialises in carbon capture, clean energy, and sustainable technologies to advance impactful CO2 reduction solutions.

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Concrete

Carbon Capture Systems

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Nathan Ashcroft, Director, Strategic Growth, Business Development, and Low Carbon Solutions – Stantec, explores the challenges and strategic considerations for cement industry as it strides towards Net Zero goals.

The cement industry does not need a reminder that it is among the most carbon-intensive sectors in the world. Roughly 7–8 per cent of global carbon dioxide (CO2) emissions are tied to cement production. And unlike many other heavy industries, a large share of these emissions come not from fuel but from the process itself: the calcination of limestone. Efficiency gains, fuel switching, and renewable energy integration can reduce part of the footprint. But they cannot eliminate process emissions.
This is why carbon capture and storage (CCS) has become central to every serious discussion
about cement’s pathway to Net Zero. The industry already understands and accepts this challenge.
The debate is no longer whether CCS will be required—it is about how fast, affordable, and seamlessly it can be integrated into facilities that were never designed for it.

In many ways, CCS represents the ‘last mile’of cement decarbonisation. Once the sector achieves effective capture at scale, the most difficult part of its emissions profile will have been addressed. But getting there requires navigating a complex mix of technical, operational, financial and regulatory considerations.

A unique challenge for cement
Cement plants are built for durability and efficiency, not for future retrofits. Most were not designed with spare land for absorbers, ducting or compression units. Nor with the energy integration needs of capture systems in mind. Retrofitting CCS into these existing layouts presents a series of non-trivial challenges.
Reliability also weighs heavily in the discussion. Cement production runs continuously, and any disruption has significant economic consequences. A CCS retrofit typically requires tie-ins to stacks and gas flows that can only be completed during planned shutdowns. Even once operational, the capture system must demonstrate high availability. Otherwise, producers may face the dual cost of capture downtime and exposure to carbon taxes or penalties, depending on jurisdiction.
Despite these hurdles, cement may actually be better positioned than some other sectors. Flue gas from cement kilns typically has higher CO2 concentrations than gas-fired power plants, which improves capture efficiency. Plants also generate significant waste heat, which can be harnessed to offset the energy requirements of capture units. These advantages give the industry reason to be optimistic, provided integration strategies are carefully planned.

From acceptance to implementation
The cement sector has already acknowledged the inevitability of CCS. The next step is to turn acceptance into a roadmap for action. This involves a shift from general alignment around ‘the need’ toward project-level decisions about technology, layout, partnerships and financing.
The critical questions are no longer about chemistry or capture efficiency. They are about the following:

  • Space and footprint: Where can capture units be located? And how can ducting be routed in crowded plants?
  • Energy balance: How can capture loads be integrated without eroding plant efficiency?
  • Downtime and risk: How will retrofits be staged to avoid prolonged shutdowns?
  • Financing and incentives: How will capital-intensive projects be funded in a sector with
    tight margins?
  • Policy certainty: Will governments provide the clarity and support needed for long-term investment
  • Technology advancement: What are the latest developments?
  • All of these considerations are now shaping the global CCS conversation in cement.

Economics: The central barrier
No discussion of CCS in the cement industry is complete without addressing cost. Capture systems are capital-intensive, with absorbers, regenerators, compressors, and associated balance-of-plant representing a significant investment. Operational costs are dominated by energy consumption, which adds further pressure in competitive markets.
For many producers, the economics may seem prohibitive. But the financial landscape is changing rapidly. Carbon pricing is becoming more widespread and will surely only increase in the future. This makes ‘doing nothing’ an increasingly expensive option. Government incentives—ranging from investment tax credits in North America to direct funding in Europe—are accelerating project viability. Some producers are exploring CO2 utilisation, whether in building materials, synthetic fuels, or industrial applications, as a way to offset costs. This is an area we will see significantly more work in the future.
Perhaps most importantly, the cost of CCS itself is coming down. Advances in novel technologies, solvents, modular system design, and integration strategies are reducing both capital requirements
and operating expenditures. What was once prohibitively expensive is now moving into the range of strategic possibility.
The regulatory and social dimension
CCS is not just a technical or financial challenge. It is also a regulatory and social one. Permitting requirements for capture units, pipelines, and storage sites are complex and vary by jurisdiction. Long-term monitoring obligations also add additional layers of responsibility.
Public trust also matters. Communities near storage sites or pipelines must be confident in the safety and environmental integrity of the system. The cement industry has the advantage of being widely recognised as a provider of essential infrastructure. If producers take a proactive role in transparent engagement and communication, they can help build public acceptance for CCS
more broadly.

Why now is different
The cement industry has seen waves of technology enthusiasm before. Some have matured, while others have faded. What makes CCS different today? The convergence of three forces:
1. Policy pressure: Net Zero commitments and tightening regulations are making CCS less of an option and more of an imperative.
2. Technology maturity: First-generation projects in power and chemicals have provided valuable lessons, reducing risks for new entrants.
3. Cost trajectory: Capture units are becoming smaller, smarter, and more affordable, while infrastructure investment is beginning to scale.
This convergence means CCS is shifting from concept to execution. Globally, projects are moving from pilot to commercial scale, and cement is poised to be among the beneficiaries of this momentum.

A global perspective
Our teams at Stantec recently completed a global scan of CCS technologies, and the findings are encouraging. Across solvents, membranes, and
hybrid systems, innovation pipelines are robust. Modular systems with reduced footprints are
emerging, specifically designed to make retrofits more practical.
Equally important, CCS hubs—where multiple emitters can share transport and storage infrastructure—are beginning to take shape in key regions. These hubs reduce costs, de-risk storage, and provide cement producers with practical pathways to integration.

The path forward
The cement industry has already accepted the challenge of carbon capture. What remains is charting a clear path to implementation. The barriers—space, cost, downtime, policy—are real. But they are not insurmountable. With costs trending downward, technology footprints shrinking, and policy support expanding, CCS is no longer a distant aspiration.
For cement producers, the decision is increasingly about timing and positioning. Those who move early can potentially secure advantages in incentives, stakeholder confidence, and long-term competitiveness. Those who delay may face higher costs and tighter compliance pressures.
Ultimately, the message is clear: CCS is coming to cement. The question is not if but how soon. And once it is integrated, the industry’s biggest challenge—process emissions—will finally have a solution.

ABOUT THE AUTHOR:
Nathan Ashcroft, Director, Strategic Growth, Business Development, and Low Carbon Solutions – Stantec, holds expertise in project management, strategy, energy transition, and extensive international leadership experience.

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