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我国矿井生产的原煤含有20％左右的灰分。1989年全国共生产原煤10.4亿吨,如果不经洗造加工,就有2亿多吨的废物在全国各地“旅游”,造成人力、物力,财力的巨大浪费。因此,原煤就要经过洗选加工,这样可以将灰分降到10％以下。但洗造加工中的煤泥也就相伴而生,约占原煤入洗量的5～7％。煤泥中含有20％～30％的水分和高达40％以上的灰分。煤泥的粘滞性较大,呈半流体状态,很难深度脱水,既不能直接用于燃烧,也不利于运输。冬季因冻结,更难于装卸。
The coal produced in mines in China contains about 20% ash. In 1989, a total of 1.04 billion tons of raw coal was produced in the country. If not processed, more than 200 million tons of waste will be “traveled” across the country, causing enormous waste of human, material, and financial resources. Therefore, the raw coal must be washed and processed so that the ash content can be reduced to less than 10%. However, the slime in the washing process also accompanies it, accounting for about 5 to 7% of the raw coal’s amount. Slime contains 20% to 30% of water and up to 40% of ash. Coal slime is relatively viscous and semi-fluid. It is difficult to dehydrate deeply. It can neither be directly used for combustion nor transported. Due to freezing in winter, it is more difficult to handle.