METHOD OF PURIFYING DETONATION NANODISPERSED DIAMONDS Russian patent published in 2016 - IPC C01B31/06 B82B3/00 B82Y40/00 B01J3/08 

FIELD: physics.

SUBSTANCE: invention relates to physical and technological processes of processing diamond-containing suspensions. Solid carbon mass, separated after detonation synthesis, is treated in autoclave with water solution of ammonium nitrate with additives of nitric acid at a temperature of 200-260°C until gas release, the concentration of solid phase in suspension makes 5 % to 1 wt% carbon components takes 5-15 wt% ammonium nitrate, and nitric acid is added in amount sufficient for its concentration in water solution of 5-10 %, after thermal-oxidative treatment in autoclave reaction mass is washed with deionised water from water-soluble impurities to obtain a suspension of cleaned nanodiamonds in water.

EFFECT: technical result of invention consists in treatment of carbon material without releasing toxic nitrogen oxides which require recycling and regeneration; reduction of temperature oxidation of carbon material is used as oxidizer nitrate salts; use of acid treatment for dissolution of metals using only diluted acids, which allows to fully exclude acid tunover from cleaning circuits.

1 cl, 1 tbl, 3 ex