High pressure water jet grinding and mineral processing technology has been combined with aview to reduce the sulphur and ash content of finely ground coal, for the purpose of preparation ofsuper-clean coal water slurry. The target type water jet mill based on the principle of abrasiveentrained water jet with self resonator was used for the finely grinding raw coal. The subsequentmechanical classification was carried out using hydrocyclone for obtaining the expected -10μmcoal fines. At the same time, finely grinding of coal with ball mill was also done for the -10μmcoal fines. Froth flotation tests using ground coal fines both by water jet mill and ball mill, underthe identical chemical conditions, were conducted. The liberation of the different componentgrains from one another well preserved its crystal form and origin surface, and the kinetics ofparticle flotation and surface hydrophobicity were greatly improved. The experimental resultsdemonstrate that the waterjet-ground coal fines have a very good performance of flotation, andachieve much higher combustible recovery (up to 80%) and much lower ash content (down to13.67%), with less grinding power consumption. The article introduced the whole experimentsand discussed the results.
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