Purification treatment method for diamond micro-powder prepared by mechanical crushing method

The invention provides a purification treatment method of diamond micro-powder prepared by a mechanical crushing method, which comprises the following steps: heating and oxidizing the diamond micro-powder prepared by the mechanical crushing method, cooling, adding acid for soaking, washing with water to separate out the diamond micro-powder, placing in molten mixed inorganic salt at 270-320 DEG C, and preserving heat for 1-2 hours, thereby obtaining the diamond micro-powder prepared by the mechanical crushing method. The mixed inorganic salt is a mixture of inorganic chloride and inorganic nitrate, and then cooling, water washing, ultrasonic cleaning and drying are performed to obtain the high-purity diamond micro-powder. The purification treatment method of low-temperature oxidation, normal-temperature dilute sulfuric acid soaking and inorganic fused salt impurity removal is adopted, the mechanically crushed diamond micro-powder is efficiently purified, all intermediate products in the treatment process can