High pressure water jet grinding and mineral processing technology has been combined with a view to reduce the sulphur and ash content of finely ground coal, for the purpose of preparation of super-clean coal water slurry. The target type water jet mill based on the principle of abrasive entrained water jet with self resonator was used for the finely grinding raw coal. The subsequent mechanical classification was carried out using hydrocyclone for obtaining the expected -10μm coal fines. At the same time, finely grinding of coal with ball mill was also done for the -10μm coal fines. Froth flotation tests using ground coal fines both by water jet mill and ball mill, under the identical chemical conditions, were conducted. The liberation of the different component grains from one another well preserved its crystal form and origin surface, and the kinetics of particle flotation and surface hydrophobicity were greatly improved. The experimental results demonstrate that the waterjet-ground coal fines have a very good performance of flotation, and achieve much higher combustible recovery (up to 80%) and much lower ash content (down to 13.67%), with less grinding power consumption. The article introduced the whole experiments and discussed the results.
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