The process flow of graphite mineral separation is mainly applicable to various graphite ores with different crystalline forms and graphite ores with silicate minerals such as mica or pyrite.
In order to protect graphite scale from damage, multi-stage grinding process is often used. The quality of concentrate can meet the requirement after repeated grinding and re-separation.
For graphite ore with heavy minerals, the combined gravity and flotation process is most often used to separate heavy minerals, that is, heavy minerals are separated by gravity separation, and then gravity tailings (light minerals) are treated by flotation.
Because the hardness of graphite ores is generally medium hard or soft, the crushing process is relatively simple, usually three-stage open circuit, two-stage open circuit or one-stage crushing process. Flotation process is generally a closed-circuit process of multi-stage grinding, multi-stage separation, and return of intermediate ore sequence (or concentration). There are three forms of multi-stage process, namely concentrate regrinding, medium ore regrinding and tailings regrinding. Crystalline graphite mostly adopts concentrate regrinding process, under normal conditions, the recovery rate of mineral processing operation can reach about 90%.
Cryptocrystalline graphite beneficiation process: Although cryptocrystalline graphite ore is of high grade, it is difficult to separate. Cryptocrystalline graphite has poor flotability. Flotation can only play a preliminary enrichment role. In most cases, the ores are handpicked before grinding and selling.