Silicate Production and Availability for Mineral Carbonation

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• 作者：P. Renforth ; C.-L. Washbourne ; J. Taylder ; D. A. C. Manning
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：March 15, 2011
• 年：2011
• 卷：45
• 期：6
• 页码：2035-2041
• 全文大小：816K
• 年卷期：v.45,no.6(March 15, 2011)
• ISSN：1520-5851

文摘

Atmospheric carbon dioxide sequestered as carbonates through the accelerated weathering of silicate minerals is proposed as a climate change mitigation technology with the potential to capture billions of tonnes of carbon per year. Although these materials can be mined expressly for carbonation, they are also produced by human activities (cement, iron and steel making, coal combustion, etc.). Despite their potential, there is poor global accounting of silicates produced in this way. This paper presents production estimates (by proxy) of various silicate materials including aggregate and mine waste, cement kiln dust, construction and demolition waste, iron and steel slag, and fuel ash. Approximately 7鈭?7 billion tonnes are produced globally each year with an approximate annual sequestration potential of 190鈭?32 million tonnes C. These estimates provide justification for additional research to accurately quantify the contemporary production of silicate minerals and to determine the location and carbon capture potential of historic material accumulations.