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Cement kiln,  · Cement kilns are used for the pyroprocessing stage of manufacture of Portland and other types of hydraulic cement, in which calcium carbonate reacts with silica-bearing minerals to form a mixture of calcium silicates. Over a billion tonnes of cement are made per year, and cement kilns are the heart of this production process: their capacity ...Talk:Baryte,  · Baryte has been listed as a level-5 vital article in Science, Earth science. If you can improve it, please do.This article has been rated as C-Class. ... This article is within the scope of WikiProject Gemology and Jewelry, a collaborative effort to improve the coverage of Gemology and Jewelry on Wikipedia. on Wikipedia..

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