The chloride roasting method is to mix graphite with a certain reducing agent to bake at high temperature in specific equipment and atmosphere. The price in the material is transformed into a metal chloride with gas or condensed phase. Purified process.

Under high temperature conditions, the impurities in graphite can be decomposed into oxides with higher melting points, such as SIO2, Al2O3, Fe2O3, CAO, MGO. Under a certain high temperature and atmosphere, these oxides react to the metal oxides and chlorine vapor reactions to generate a lower melting point chloride. So at a lower temperature, these chloride can be gasized and refreshing, achieving separation from graphite, so that graphite can be purified.

The advantage of chloride roasting method is that energy saving, high purification efficiency (> 98%), high recovery rate, but also problems such as poisonous chlorine gas, severe corrosiveness, and severe pollution environment. The purity of the production of graphite in craftsmanship is limited, and the stability of the craftsmanship is not good. It affects the application of the chloride method in actual production. It needs to be further improved and improved