Method for purifying high-carbon graphite by weak acid hydrothermal method

The invention discloses a method for purifying high-carbon graphite by a weak acid hydrothermal method, and relates to a graphite purification method. The invention aims to solve the problems of environmental pollution, long time consumption and high energy consumption in the existing graphite purification method. The method comprises the following steps: carrying out hydrothermal reaction by using a mixed solution of phosphoric acid and hydrofluoric acid to obtain primary purified graphite, and carrying out hydrothermal reaction by using a mixed solution of phosphoric acid and disodium ethylene diamine tetraacetate to obtain secondary purified graphite; and performing deep purification by using microwave plasma microwave treatment and starting a direct-current power supply. According to the method, the acidic condition is reasonably optimized, and a plurality of purification modes are adopted to synergistically strengthen purification, so that the total time of graphite purification is shortened, the problem