METHOD OF PRODUCING HIGH-QUALITY METAL POWDERS FROM SLUDGE WASTES OF MACHINE BUILDING PRODUCTION Russian patent published in 2021 - IPC B22F9/22 B33Y70/00 C22B7/00 

FIELD: technological processes.

SUBSTANCE: invention relates to production of powders for additive production from metallurgy and machine building wastes in form of slurries. Method includes cleaning said sludge from lubricating-cooling liquid by washing with an organic solvent and distilled water, followed by centrifugation and drying in an inert atmosphere at temperature of 100°C to 150°C, plasma-coated to obtain fraction of 10-150 mcm, plasma spheroidization of the recovered fraction with thermal plasma in a chamber at pressure of 0.88 to 1 atm in a stream of an inert gas at a flow rate of 1 to 6 liters per minute, in which hydrogen is introduced as reducing gas in amount of 1 to 4 liters per minute. Consumption of recovered fraction during plasma spheroidisation ranges from 0.5 to 3 kg/h. Powder obtained after plasma spheroidisation is washed in an ultrasonic bath.

EFFECT: obtaining high-quality powders for additive production from wastes.

3 cl, 1 tbl, 1 ex, 3 dwg