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COMMON CLAY

机译:普通粘土

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摘要

Common clay is a natural, fine-grained material composed of hydrous aluminum silicates. Shale is a laminated sedimentary rock formed by the consolidation of clay, mud and silt. About 142 companies produced common clay and shale in 41 states. Estimated domestic production in 2008 was 17.5 Mt (19.3 million st) valued at 93 million dollars, based on a preliminary survey of the common clay and shale industry. This was a 15-percent decrease in tonnage from 20.6 Mt (22.7 million st) produced, valued at 216 million dollars, in 2007. The leading producer states, in decreasing order by tonnage, were Alabama, Texas, North Carolina, Georgia and Ohio. These five states accounted for 41 percent of U.S. production in 2008.
机译:普通粘土是由含水硅酸铝组成的天然细颗粒材料。页岩是由粘土,泥浆和淤泥固结而成的层状沉积岩。约有142家公司在41个州生产普通粘土和页岩。根据对普通黏土和页岩产业的初步调查,2008年的国内产量估计为17.5吨(1,930万吨),价值9,300万美元。这比2007年生产的20.6吨(2270万标准吨)的吨位减少了15%,价值2.16亿美元。主要的生产州依次为阿拉巴马州,德克萨斯州,北卡罗来纳州,乔治亚州和俄亥俄州。这五个州占2008年美国产量的41%。

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