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Flotation of graphite
Press mineral floatability classified graphite mine nonpolar non-metallic type, having a good natural hydrophobic, oil-hydroxysteroid only collector or flotation can only blowing agent, it is easy to float dressing stone.
Graphite crucible used in the manufacture, and other advanced refractory MgO-C brick and a brush, a lubricant, insulation and the like.
Graphite minerals are classified into two types: crystalline scales and cryptocrystalline soils. The former crystal is larger than 1μm, and the ore grade is low, but the selected concentrate has high quality and wide application. The coarse graphite can be recovered by a shaker, and the fine graphite can be recovered by flotation.
In theory, graphite is a natural hydrophobic mineral. In fact, its floatability varies greatly depending on the impurity content, the degree of surface oxidation (C=C on some refractory graphite surfaces), and the embedding characteristics. In the process of grinding, the ink and the gangue rub against each other, so that the surface of the gangue often has a graphite film, which increases the difficulty of separation.
Common Collector coal oil, # 2 oil as foaming agent. In order to improve the concentrate grade, sodium silicate, hydrofluoric acid or the like can be used as an inhibitor of quartz and clay .
Studies on refractory graphite containing an olefinic hydroxyl group (-C=C-) have shown that the treatment of heating the ore at 300 ° C can cause the alkenyl group to disappear and improve the recovery of graphite flotation. The addition of NaOH (1 kg/t) or Na 2 CO 3 (4 kg/t) to the grinding can also greatly increase the recovery of graphite.
A typical process for flotation of coarse-grained flake graphite is to divide the tailings by coarse selection after grinding, and then insert two sections of grinding in the five selections. The selected tailings (middle mines) are concentrated back. Bold the job.