Analysis of Ore Dressing Technology of Graphite

Graphite is crystallized carbon with crystalline layer, which has a high conductivity and conductivity, and resistant against high temperature, stable chemically, small hardness, easily stuck to solid surface, can draw clear dark streaks on the paper. With all these good properties, it has been widely used in the industry.

Graphite flotation often uses flotation method, sometimes uses shaking sorting. Graphite uses electrostatic separation, but due to ore beneficiation requiring thorough drying and precise classification, and high voltage power supplies are difficult to manage in a humid environment, fine particle component is difficult to deal with and other reasons, electrostatic separation cannot be promoted widely.

Graphite is mineral material easier to be floated in non-metallic minerals. Graphite is frequently associated with MICA in order to prevent it from being entered foam. Inhibition with water glass is available. Water glass can inhibit many other gangue minerals.

Flake graphite has good flotation, graphite particles less than 1.65mm can be floated. Sometimes in order to advance separate out large areas of graphite and carbon graphite, screening (or hydrocyclone classification) dissociation was able to isolate large flake graphite as the final product. In order to protect graphite flakes from repeated abrasion, roughing grinding fineness of feed may be thicker, rougher concentrate should be with multi-stage grinding.

Ore dressing of cryptocrystalline graphite is still difficult, mainly due to bad quality of graphite floatation, this is because the hidden quality of graphite crystals are small, often embedded in clay. The recovery rate of flotation process is low, with high grade of tailings, so the method cannot be abandoned.