The results of the flotation experiments shows that the ash content of the washed coal is only half of the coal slurry flotation without comminution by high pressure water jet and the total sulfur content is 20 present .

试验结果表明，高压水射流粉碎 过的煤泥浮选后其精煤的灰分含量为煤泥直接浮选 精煤含量的一半，全 硫含量仅为煤泥直接浮选精煤含量的五分之一。

Only washed coal or high quality and low sulfur content coal can be allowed to directly use by boilers for space heating and production .

对于采暖及生产锅炉直接燃煤，必须使用优质 低硫煤或经 洗选的煤炭；