Graphite Beneficiation Processing Methods

Graphite has good flotability, the current used method is multi-flotation process. Flotation reagents used kerosene, II oil, water glass, lime, etc. Because graphite disseminated degree, thus grinding fineness coarse, usually accounting for 45-60% -100 mesh. Flake graphite mine and then use more coarse tip flotation mill re-election, that is, first coarse grinding, roughing, to get to the living body mainly low-grade ore shoots (grade of 40-50%), and then the low-grade concentrate regrinding, re-election was eventually concentrates. regrinding frequency of 3-7 times, usually 3-4 times the final concentrate grade is generally between 85-89%. to suppress pyrite, mica and other associated minerals can be added lime, paste tip, water glass and other agents. except flotation, but also the use of electrostatic beneficiation method. Japan has built a pilot plant electrostatic separation, but the handling capacity is relatively small due to the mine need to dry electrostatic separation and precision grade, in a wet environment on the high voltage power supply difficult to manage, difficult to handle fine pull some other reasons, there is no actual production. Recently reported that the carbon graphite electrostatic separation process works well, concentrate grade of 96% or so. flake graphite winnowing process can also be used, but the recovery rate is not high in the severe water shortage areas available winnowing graphite preliminary enrichment, and then the crude concentrate to the water-rich region selection.