A new sequestration process of anthropogenic CO 2 using waste cement was proposed. The proposed process contains two main reactions. The first reaction is an extraction reaction of calcium ion (Ca 2+) from waste cement particles by pressurized CO 2. The second reaction is a precipitation reaction of CaCO 3. Ca 2+ extracted from waste cement was deposited as a CaCO 3 when the pressure was reduced to the low CO 2 pressure. CaCO 3 was directly disposed or recycled as a raw material of cement production. Energy consumption for the operation was 25.9 Mw/100-Mw power generation, and the sequestration cost was ∼ $83/1 ton carbon sequestration.
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