METHOD FOR EXTRACTING COPPER FROM SOLUTIONS OF AMMONIA LEACHING SLAGS OF COPPER MELTING PRODUCTIONS Russian patent published in 2021 - IPC C22B15/00 C22B3/30 B01D11/04 

FIELD: copper extraction.

SUBSTANCE: invention relates to a method for extracting copper from solutions of ammonia leaching of slags of copper smelting industries. The extraction of copper includes the extraction of copper from the aqueous phase into the organic phase, the separation of the aqueous and organic phases using a separating funnel and the re-extraction of copper from the organic phase with an aqueous solution containing from 150 to 200 g/l of sulfuric acid. Extractive extraction is carried out at an equal ratio of the aqueous phase, which is used as a solution of ammonia leaching of slags from copper smelting industries, and the organic phase, which is used as a solution of LIX 84-I in kerosene with a mass fraction of 70.00%. Extractive extraction is carried out at a temperature of 20 to 25°C in a thermostated external loop, with continuous stirring at a speed of 400 to 600 rpm and contact time of the phases from 15 to 20 min, to obtain organic and aqueous phases. These phases are analyzed for copper content, the organic phase is subjected to stripping. The organic phase recovered after stripping is reused as an extractant, and the aqueous phase, which is an aqueous solution of copper sulfate, is used for several stages of stripping and the accumulation of copper sulfate in it to a concentration of 125 g/l.

EFFECT: method makes it possible to increase the degree of selective extraction of copper from ammonia solutions containing sulfate ions using liquid extraction.

1 cl, 4 dwg, 1 tbl, 4 ex