METHOD OF OBTAINING PURE GRAPHITE Russian patent published in 2010 - IPC C01B31/04 

FIELD: chemistry.

SUBSTANCE: invention relates to production of pure graphite with high purity of 7-3 with total content of ash impurities of not more than 0.001%. The graphite is widely used in making tools in the industry of highly pure and semiconductor materials, in nuclear industry and other fields. The method of obtaining pure graphite in graphitation furnaces involves treatment of a workpiece in a high temperature zone in an atmosphere of a cleaning reagent which contains fluorine and chlorine and subsequent cooling of the workpiece. The cleaning reagent used is dichloromethane and treatment, which starts at 2100-2200°C, is carried out while heating to furnace shutdown temperature of 2700-2800°C for 3-4 hours after shutting down the furnace with uniform hourly consumption equal to 0.7-0.8% of the mass of the workpiece and then at hourly consumption of the cleaning reagent equal to 0.1-0.5% of the mass of the workpiece after cooling the workpiece to 1800-1900°C.

EFFECT: invention lowers power consumption and reduces the cost of obtaining the end product.

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