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采用常规的真空脱水技术将细粒精煤（-0．589mm）的水分降至20％或更低的水平是很困难的。高压过滤技术为获得低水分的细粒精煤提供了一条可行的途径。本文介绍了两种在压滤过程中使用的新方法，使用这两种方法可使细粒精煤的水分比采用常规压滤技术更低。这两种方法是（a）分级脱水，（b）向煤浆中添加纸浆。对匹兹堡8号煤浆用0．038mm筛网进行分级脱水，可得到水分为12．9％的滤饼，而不作分级处理，滤饼水分高达24．9％。向煤浆中加入纸浆，可使滤饼水分降至17％左右。
It is difficult to reduce the moisture content of fine coal (-0.589 mm) to 20% or below using conventional vacuum dewatering techniques. High-pressure filtration technology provides a viable approach for obtaining fine-grained coal with low moisture content. This article describes two new methods used in the filter press process that use both of these methods to make the moisture content of fine coal cleaner lower than with conventional filter press technology. These two methods are (a) fractional dehydration, (b) addition of pulp to the coal slurry. The Pittsburgh 8 coal slurry with 0.038mm mesh grading dehydration, get 12.9% moisture content of the filter cake, without grading treatment, cake moisture up to 24.9%. Add coal slurry to the pulp, the filter cake can be reduced to about 17% moisture.