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6.1.2 Lead and beneficiation Due to low content, run-of-mine -bearing ores must be concentrated before smelting and refining. Beneficiation, which usually occurs at the mine, consists of crushing, grinding, and flotation to produce of 50 to 60 percent . Lead

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Pb-Zn divides into sulfide Pb-Zn and oxide Pb-Zn . Flotation is the most widely used in sulfide Pb-Zn , to and plumbum , sometimes for sulfide iron and other minerals . Sulfide Pb-Zn process divides into priority flotation process , mix- flotation , asynchronous flotation ,and so on .It is a technological enterprise that
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The presence of shale, the source of carbonaceous matter in the , has also a negative effect on flotation and pyrometallurgical processes. The presence of clay minerals and organic carbon in shale makes the production of flotation , without excessive loss of copper and other metals in the flotation tailing
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· In the present industrial production, these complex iron ores are pretreated by a joint physical process of grinding, reselection, magnetic and flotation. However, it is hard to obtain - iron because the contents of tin and remained in them are in excess of 0.13%
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M.F. Yan, in Concise Encyclopedia of Advanced Ceramic Materials, 1991. 1 Processing. oxide is prepared commercially by two methods: the American or direct process, which uses and , and the French or indirect process, which uses metal. Some 54% of US oxide production is from and American process, 33% from slab French process