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随着煤炭工业的迅速发展和采煤机械化程度的不断提高,各选煤厂入洗原煤中—0.5毫米级粉煤的含量不断增加,再加上原煤在洗选和运输过程中的磨擦、碰撞和泥化,又产生一定数量的次生煤泥,因此实际的粉煤最一般可达入洗原煤量的20～25％左右,这些粉煤,除浮选回收了部分精煤外,其余的流入厂外沉淀池回收最后仍有大量的流失。这是因为以往没有有效的设备加以处理而造成大量浪费国家资源和环境的污染。
With the rapid development of the coal industry and the continuous improvement of mechanization of coal mining, the content of -0.5 mm-grade pulverized coal in coal washing plants at various coal preparation plants continues to increase, together with the friction and collision of raw coal in the process of washing and transportation And mud, but also produce a certain amount of secondary slime, so the actual average up to about 20-25% of raw coal washing, the pulverized coal, in addition to flotation recovered part of the coal, the rest In the end, there is still a lot of loss of inflow sedimentation tank to the factory. This is because in the past, there was no effective equipment to deal with this, which caused a great waste of resources and the pollution of the environment.