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.

When detected by the revolving detector, the change of the water content in slurry results in the difference of resistance torque and correspondingly the rotate speed changes.

A determination is made of the relationship of the emission rate of fluorine during the evaporation of acidic ammonium phosphate slurry with the degree of neutralization and water content.