Processing method of diamond micropowder

The method for treating diamond micropowder includes the following steps: performing alkali treatment on the diamond micropowder to be treated to obtain an alkali-treated diamond micropowder; subjecting the alkali-treated diamond micropowder to hydrochloric acid treatment and passing ozone to obtain a diamond micropowder intermediate; It was dried to obtain fine diamond powder. The treatment method provided by the invention avoids the use of strong oxidizing acid, saves the cost, and reduces the pollution to the environment through ozone treatment when the diamond micropowder is treated. In addition, the impurity content in the diamond micro powder obtained by the present invention is relatively low. The experimental results show that the content of cobalt in the diamond micropowder obtained by the treatment method provided by the present invention is less than or equal to 5 ppm, the content of manganese is less than or equal to 10 ppm, and the content of iron is less than or equal to 5 ppm.

Main claim: 1. a processing method of diamond micro-powder, comprising the following steps: the diamond micro-powder to be treated is subjected to alkali treatment to obtain the alkali-treated diamond micro-powder; The alkali-treated diamond micro-powder is carried out to hydrochloric acid treatment and ozone to obtain the diamond micro-powder Intermediate; drying the diamond micropowder intermediate to obtain diamond grinding powder. 2. The treatment method according to claim 1, wherein the alkali treatment adopts an alkaline substance; and the alkaline substance includes sodium hydroxide and/or potassium hydroxide. 3. The processing method according to claim 2, wherein the mass ratio of the to-be-treated diamond micropowder and the alkaline substance is 1:2.8～3.3. The treatment method according to claim 1, wherein the temperature of the alkali treatment is 780°C to 830°C. 5. The treatment method according to claim 1, wherein the alkali treatment time is 1.5h～2.5h. 6. treatment method according to claim 1 is characterized in that, the mass ratio of described alkali-treated diamond micropowder and hydrochloric acid is 1:2.8～3.3. 7. The treatment method according to claim 1, characterized in that, the temperature of the ozone permeation is 95°C to 105°C. 8. The treatment method according to claim 1, characterized in that, the time for the passage of ozone is 1h to 30h. 9. The treatment method according to claim 1, characterized in that, the mass concentration of the ozone used in the ozone flow is 20 mg/L to 25 mg/L. 10. The processing method according to claim 1, wherein the drying temperature is 60℃～150℃; and the drying time is 1h～8h