Cement & lime

Calix's technology has the potential to enable both the cement and lime industries reduce their carbon dioxide (CO2) emissions dramatically.

Cement is the second most consumed substance on Earth after water.

Cement is one of the most widely used substances on the planet, fulfilling an essential role in providing society’s need for housing and infrastructure while lime is used in a variety of applications including in the iron & steel, chemical, paper and pharmaceutical industries. Both sectors have relatively high carbon dioxide (CO2) emissions.

Your challenges

Up to 60 percent of CO2 emissions from cement and lime manufacturing are released directly and unavoidably from the processing of the raw materials – not from the combustion of fossil fuels. This occurs in both lime and cement manufacture via the following reaction:

CaCO3 (limestone) + heat -> CaO (lime) + CO2 (carbon dioxide)

Since 1990, the largest multinational cement companies have reduced their CO2 emissions by 20-25 percent. They have done so by improving energy efficiency and using waste-derived fuels and raw materials, as well as replacing the energy-intensive clinker by other constituents in cement or concrete.

But in order to reach the EU’s emissions reductions targets by 2050, carbon capture technologies need to be applied to the majority of cement plants, and Calix’s technology is uniquely placed to support the industry to achieve these targets in a timely, effective and efficient manner.


Project LEILAC – Low Emissions Intensity Lime & Cement

Calix is leading a consortium of some of the world’s largest cement and lime companies with the goal of developing a breakthrough carbon capture process that would enable both cement and lime industries to reduce their carbon dioxide (CO2) emissions dramatically.

A project of the European Union Horizon 2020 Research & Innovation
Project LEILAC website

LEILAC Partners


The core technology – Direct Separation

Calix’s technology re-engineers the existing process flows of a traditional calciner, indirectly heating the limestone via a special steel vessel. This unique system enables pure CO2 to be captured as it is released from the limestone, as the furnace exhaust gases are kept separate. The solution requires no additional chemicals or processes, and minimal changes to the conventional processes for cement.

Construction of the LEILAC pilot plant

Watch this time lapse video of Project LEILAC’s structure construction from the beginning to the ribbon cutting –  a significant step in enabling Direct Separation to become one of the principal methods of capturing the carbon emissions from the lime and cement industries… and another step towards Paris climate goals.

Relevant articles

December 19, 2019 \ Reducing CO2 Emissions
Leilac Expert Insight Series : Simon Thomsen

In this video of the Leilac Expert Insight, Simon Thomsen, Calix Project Engineer explains how Calix applied its technology to

December 19, 2019 \ Reducing CO2 Emissions
Leilac Expert Insight Series : Phil Hodgson

In this video of the Leilac Expert Insight, Phil Hodgson, Calix CEO and Managing Director, talks about the importance of

December 19, 2019 \ Reducing CO2 Emissions
Leilac Expert Insight Series : Mark Sceats

In this video of the Leilac Expert Insight, Mark Sceats, Calix Chief Scientist, discusses the evolution of the Calix Technology

Calix has unique potential to scale solutions to the United Nations’ Sustainable Development Goals (SDGs).

Calix’s solutions for Reducing CO2 Emissions help us contribute to many global goals, particularly SDG 13 – taking urgent action to combat climate change and its impacts.

Our Sustainability Series dives deeper into each of these challenges and explains how Calix contributes.

Read our Sustainability Series

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