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由于矿石性质日趋复杂,有用矿物嵌布粒度偏细,因此,用通用的200目(0.074毫米)表示磨矿细度已不能完全适应,尚需用65目(0.2毫米)和400目(0.038毫米)分别表示粗、细磨矿细度。选矿厂磨矿细度通常用分级机溢流中小于200目含量表示,各磨矿粒级含量间的关系用β~(-d)=1-e~(-kd)公式计算,结果见附表。在矿石比重为2.7—3.0时,计算结果与实际结果符合。对-200目含量低于30%的矿物,用65目含量多少表示为宜,对-200目含量高于100%的矿物,用400目含量多少表示为宜。
Due to the increasingly complex nature of the ore, the fineness of the useful minerals embedded in the cloth is so small that the fineness of the grind can not be fully adapted with the universal 200 mesh (0.074 mm), yet 65 mesh (0.2 mm) and 400 mesh (0.038 mm ), Respectively, said coarse, fine grinding fineness. The grinding fineness of the ore dressing plant is usually expressed by the content of less than 200 mesh in the overflow of the classifier. The relationship between the grain size of each grinding grain is calculated by the formula of β -d = 1 -e -kd table. When the ore weight is 2.7-3.0, the calculation result is in accordance with the actual result. The content of -200 mesh is less than 30% of the minerals, with 65 mesh content that is appropriate, for the -200 mesh content of more than 100% of the minerals, with the content of 400 mesh expressed as appropriate.