Ultra-high purity purifying technique for native graphite

Abstract

The invention discloses a hyper-high purity extracting technology of natural graphite, which comprises the following steps: (1) putting natural graphite in the container to do oxidizing disposal with low-middle carbon content more than 98%; (2) fusing at high temperature; (3) inputting in the metal erosion-proof container; proceeding dealkalization; (4) deacidifying to wash to neutral; (5) proceeding electromagnetic black metal removing disposal in the floating pool; (6) heating in the autoclave from 118 deg, 206 deg and 220 deg separately; (7) using pure water to dispose; (8) dehydrating; (9) drying until the water content is less than 0.1%.

Description

technical field [0001] The invention relates to an ultra-high-purity purification method of natural graphite, in particular to an ultra-high-purity purification process of natural flake graphite. Background technique [0002] At present, the purification methods of natural graphite known at home and abroad are divided into low-purity purification and high-purity purification. In the industry, people usually refer to graphite with a carbon content of less than 94% as medium and low-carbon graphite, and refer to graphite with a carbon content of 94%. -99.8% is called high-carbon graphite; the carbon content of 99.9%-99.99% is called high-purity graphite, and the carbon content of more than 99.99% is called ultra-high-purity graphite. In high-purity purification, high-temperature electrothermal method and alkaline purification with sodium hydroxide at a temperature of 700°C to 800°C are commonly used. The former uses the high-temperature resistance of graphite, puts it in an el...