1. Beneficiation processing method of crystalline graphite
Crystalline graphite has good natural floatability. In China, flotation is mainly used for beneficiation. Since the size of the graphite scale is one of its most important quality indicators, a multi-stage grinding and multiple-choice process is used in the selection method to select large scale graphite as early as possible. Conventional flotation collector as kerosene, diesel, oil foaming agent II, IV oil, lime adjusting agent, sodium carbonate, sodium silicate inhibitor.
2. cryptocrystalline graphite beneficiation processing method
The cryptocrystalline graphite crystal is extremely small, so it is also called microcrystalline graphite. Graphite particles are often embedded in clay , and separation is difficult. Due to the high grade of ore (generally containing 60% to 80% of carbon), many graphite mines directly produce crushed ore and sell graphite powder products. Hunan Lutang Graphite Mine established flotation plant flotation microcrystalline graphite in the 1950s, but stopped production due to high cost. At present, some units are still conducting research on new microcrystalline graphite flotation processes (such as oil agglomeration flotation).
3. Purification processing of graphite products
The requirements of modern industry for graphite products are developing in two aspects: one is to require high crystal size of the crystal scale, and the other is to require ultrafine particles (such as less than 1 μm or 0.5 μm). China has established graphite purification and fine powder processing lines in graphite processing plants such as Nanshu, Beishu, Liumao and Xinghe. The purification method is mainly chemical purification. The most mature process for chemical purification of graphite is to use a caustic alkali and graphite to melt at 700 ° C, then wash to neutral, then add hydrochloric acid to treat and wash, so that the carbon content of graphite reaches 98% to 99%. Some manufacturers also use hydrofluoric acid to produce high-purity graphite.
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