At present, the problems of graphite industry in China are outstanding, the resource waste is very serious, the basic carbon content of hidden crystalline graphite is more than 70%, when coal is burnt out, most of the remainder is low-grade ore; flake graphite deep processing ratio and level is still very low, most of them are also cheap export; technology, technology, equipment, the level of backwardness, mining, mineral processing technology 40 or 50 years without major breakthroughs and changes, many graphite processing technology is not advanced, products are only primary processing products. In the process of graphite deep processing materials and technology mainly include high-purity graphite, ultrafine (ultra-thin) graphite, lithium ion battery cathode graphite, graphite interlayer compounds and their derivatives, graphene, natural graphite composite materials. High purity graphite is the basis of most deep-processing products, so graphite purification technology is the first. Using high temperature volatilization method, the graphite is heated to more than 2,800 ℃, and the ash in natural graphite can evaporate out (quartz boiling point 2,750 ℃). The method can make graphite carbon content up to 99.99%, or even higher, is the most effective method to prepare ultra high purity graphite. Ultrafine Graphite Powder Using the graphite’s own layered structure characteristics, it is an effective method to obtain ultrafine flake graphite powders by adding force (blasting, ultrasonic, electrochemistry, etc.) to destroy the binding force of C-axis direction. Li-Ion battery is a chemical power supply with rapid progress, huge market capacity and fastest development. Graphite is the main anode material used in two lithium-ion batteries currently commercialized. Natural graphite is cheap, but it must be modified and modified to be used in large scale for lithium-ion batteries. The key technique is to control purity, granularity and shape.
