Optimization of Regrinding Process to Reduce Content of Microfine Flake Graphite in Concentrate
A vertical stirring mill was introduced for regrinding the graphite concentrate from the rougher in a graphite mine of Heilongjiang Province.Using ceramic ball as the grinding medium,the influences of processing parameters,including rotation speed of mill,diameter of medium ball and grinding time,on the grinding and flotation performances of graphite ore were investigated.The graphite ore was beneficiated adopting an open-circuit flotation process after it was milled with the optimized grinding parameters including alternating(slow-fast-slow)rotation speed,medium ball diameter of 8-10 mm and grinding time of 5 min.The as-obtained graphite concentrate,with the 24.51%in a size fraction of-0.045 mm,has a fixed carbon content of 95.83%and large-flake graphite content of 14.27%.
flake graphiteregrindingvertical stirring millrotating speed of millgraphite concentrate
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