1. Purification processing of graphite products Graphite powder manufacturers
Modern industry requires graphite products to develop in two ways: one is to require large wafers to achieve high purity, the other is to require graphite product particles to be ultra-fine (such as less than 1 meter 0.5 meter). China has established graphite purification fine powder processing production lines in graphite processing plants in Nanhu, Beishu, Liumao Xinghe. The most mature graphite chemical purification process is to use caustic alkali graphite to melt at 700 ℃, wash to neutral, wash with hydrochloric acid, so that the graphite carbon content reaches 98% to 99%. Some manufacturers use hydrofluoric acid treatment to produce high-purity graphite.
2. Mineral processing method of crystalline graphite
Crystalline graphite has better natural floatability is usually used for mineral processing in China. Since the size of graphite flakes is one of the most important quality indicators, multi-stage grinding multi-stage separation processes are used in the separation method to large-scale graphite as early as possible. The commonly used flotation collectors are kerosene diesel, the foaming agent is oil. The regulator is lime sodium carbonate, the inhibitor is water glass.
3. Processing method of cryptocrystalline graphite mineral processing
Cryptocrystalline graphite crystals are very small, so it is also called microcrystalline graphite. Due to the high grade of rough stone (usually containing 60% to 80% carbon), many graphite mines directly crush the produced ore sell graphite powder products. Hunan Lutang Graphite Mine established a flotation microcrystalline graphite flotation plant in the 1950s, but it stopped production due to high costs. At present, some units are still carrying out research on new microcrystalline graphite flotation technology (such as petroleum coagulation flotation, etc.).