February 2009
Volume 61    Issue 2

Accelerated weathering of limestone for CO2 mitigation: opportunities for the stone and cement industries

Mining Engineering , 2009, Vol. 61, No. 2, pp. 27-27
Langer, William H.; San Juan, Carma A.; Rau, Greg H.; Caldeira, Ken


Large amounts of limestone fines co-produced during the processing of crushed limestone may be useful in the sequestration of carbon dioxide (CO2). Accelerated weathering of limestone (AWL) is proposed as a low-tech method to capture and sequester CO2 from fossil fuel-fired power plants and other point sources such as cement manufacturing. AWL reactants are readily available, inexpensive and environmentally benign. Waste CO2 is hydrated with water to produce carbonic acid. This reacts with and is neutralized by limestone fines, thus converting CO2 gas to dissolved calcium bicarbonate.

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