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The cement industry is one of the most challenging sectors for decarbonization, accounting for approximately 8% of global CO2 emissions, with over 85% stemming from process emissions during clinker production and fuel combustion IPCC AR6. CCUS technologies are emerging as a critical solution, enabling up to 90% capture rates while allowing continued use of existing infrastructure. Recent advancements in 2024 highlight scalable pilots and policy support, positioning CCUS as a viable pathway for net-zero cement production by 2050.
Post-combustion amine-based capture systems have been successfully integrated into cement plants, capturing CO2 from flue gases. A breakthrough pilot at LEILAC 2 in Belgium, operational since 2023, uses indirect calcination to separate CO2 early in the process, achieving over 95% capture efficiency without significant energy penalties HECL LEILAC Project. This technology avoids the need for full plant retrofits and reduces costs to around €50-70 per tonne of CO2 captured, down from previous estimates.
Innovative direct capture methods, such as Calix's accelerated carbonation, mineralize CO2 into stable carbonates during production. In 2024, a full-scale demonstration in Australia processed 10,000 tonnes of CO2 annually, integrating with existing kilns and producing low-carbon cement equivalents Calix Limited Report. This approach not only captures emissions but utilizes CO2 as a resource, potentially offsetting up to 20% of production costs through carbon credits.
Captured CO2 is increasingly utilized in products like CO2-cured concrete blocks, which enhance material strength while sequestering emissions. A 2024 study by CarbonCure demonstrated that injecting CO2 into ready-mix concrete reduces the carbon footprint by 5-10% per cubic meter without altering mix designs CarbonCure Technology Overview. Scaling this could avoid 1-2 GtCO2 annually by 2030 in the construction sector.
The U.S. Department of Energy's 2024 initiatives, including $75 million in funding for CCUS hubs, target cement as a priority, with projects like the Heartland Hub aiming to capture 1 MtCO2/year from regional plants DOE CCUS Funding Announcement. In Europe, the EU's Net-Zero Industry Act mandates CCUS deployment for hard-to-abate sectors, providing €10 billion in subsidies through 2030 EU Net-Zero Industry Act.
Internationally, the UNIDO's 2024 report emphasizes CCUS as essential for developing nations' cement sectors, with case studies from India showing 30% cost reductions via blended incentives UNIDO Breakthrough Technologies. These policies are driving private investments, with global CCUS capacity for industry projected to triple by 2025.
Despite progress, challenges include high upfront costs (€300-500 million per plant) and infrastructure needs for CO2 transport and storage. Energy penalties from capture (10-20% of plant energy) require renewable integration. Ongoing R&D, such as solid sorbent innovations, aims to cut costs by 50% by 2030 IEA CCUS Report.
By combining CCUS with efficiency measures and alternative fuels, the cement sector could achieve 70-90% emissions reductions. Collaborative hubs and standardized regulations will be key to widespread adoption, supporting global net-zero goals.