METHOD OF EXTRACTING NON-FERROUS METALS FROM WATER SOLUTIONS OF THEIR SALTS Russian patent published in 2009 - IPC C22B3/44 C22B23/00 

FIELD: metallurgy industry.

SUBSTANCE: invention refers to method of extracting non-ferrous metals from water solutions of their salts, and can be used both for cleaning of spent solutions of chemical or galvanic nickel coating from nickel, cobalt, molybdenum, tungsten, vanadium and bismuth ions, and for extracting those metals from other solutions of industrial production, as well as for manufacturing powders of the above metals or their suspensions. Method involves extraction of non-ferrous metals from water solutions containing sodium hypophosphite and nickel ions by bringing the ratio of mole concentrations of ions of nickel and sodium hypophosphite up to the value more than 1:1, and content of nickel ions in the solution - up to the value of 5-2 g/l. The conditions are created, which contribute to reduction of ions of non-ferrous metals in the solution to free metals by introducing ammonium hydroxide to the solution till pH solution equal to 7.8-8.3 is obtained. Then sodium hydroxide is added to the solution till concentration is 150-400 g/l, and solution is kept at room temperature during 12-15 hours with formation of non-ferrous metals deposit which is separated by filtration. Then phosphorus is removed from the solution.

EFFECT: increasing degree of removing non-ferrous metal from solution.

2 cl, 13 ex