Method for preparing high-purity graphite through purifying natural high-carbon flake graphite by using alkaline-acid complexing method

The invention discloses a method for preparing high-purity graphite through purifying natural high-carbon flake graphite by using an alkaline-acid complexing method, relates to a preparation method of natural high-purity flake graphite and aims to solve the problems that a toxic HF (Hydrogen Fluoride) solution is utilized or the risk is high, and metal heteroions are easy to mix in the traditional preparation method of the high-purity graphite. The method comprises the steps: firstly, carrying out high-temperature alkaline treatment; secondly, carrying out acid treatment by chlorazotic acid; thirdly, carrying out second alkaline treatment; and fourthly, carrying out synergic complexing treatment to obtain the high-purity graphite. The method has the advantages that: firstly, the natural high-carbon graphite is treated by means of the respectively and synergic effects of an alkaline, an acid and a complexing agent, so that the defects of incapability of removing all silicates and metal ions, high investment, c