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

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Abstract

Large amounts of limestone fines coproduced during the processing of crushed limestone may be useful in the sequestration of carbon dioxide (CO 2). 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 CO 2 is hydrated with water to produce carbonic acid, which then reacts with and is neutralized by limestone fines, thus converting CO2 gas to dissolved calcium bicarbonate. AWL waste products can be disposed of in the ocean. Feasibility requires access to an inexpensive source of limestone and to seawater, thus limiting AWL facilities within about 10 km of the coastline. The majority of U.S. coastal power generating facilities are within economical transport distance of limestone resources. AWL presents opportunities for collaborative efforts among the crushed stone industry, electrical utilities, cement manufactures, and research scientists.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
Accelerated weathering of limestone for CO2 mitigation opportunities for the stone and cement industries
ISBN:
9781615671533
Volume
1
Year Published:
2009
Language:
English
Larger Work Title:
SME Annual Meeting and Exhibit and CMA's 111th National Western Mining Conference 2009
First page:
310
Last page:
315
Number of Pages:
6
Conference Title:
SME Annual Meeting and Exhibit and CMA's 111th National Western Mining Conference 2009
Conference Location:
Denver, CO
Conference Date:
22 February 2009 through 25 February 2009