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Direct separation


Technology Description

Direct separation involves indirectly heating limestone for clinker production in a calciner using a special steel vessel. This enables pure CO2 from limestone (process emissions) to be captured as it is released, since fuel combustion emissions are kept separate.

Relevance for Net Zero

CO2 capture and storage is a key technology to reduce otherwise difficult to avoid process emissions from cement production. Chemical absorption and calcium looping are currently more advanced (given experience in the power sector in the case of chemical absorption). Direct separation has potential to play a role if further development and cost reductions are successful; given that it is targeted at process emissions, it would need to be applied in conjunction with another CCS technology if targeting full capture of plant emissions.

Key Countries

Germany, Poland, USA, Australia

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