NICKEL MATTE PROCESSING METHOD Russian patent published in 2013 - IPC C22B23/00 C22B3/08 

FIELD: metallurgy.

SUBSTANCE: method involves leaching of matte using a nickel solution at increased pressure and temperature so that nickel sulphate solution is obtained. Nickel sulphate solution is cleaned from impurities of iron, copper and cobalt, and nickel is extracted by means of electrowinning from clean solution of nickel sulphate so that cathode nickel and sulphuric anolyte containing nickel sulphate and sulphuric acid is obtained. Sulphuric anolyte is subject to extraction treatment using a mixture of tertiary amines and aliphatic alcohols as an extracting agent with extraction to the extract of sulphuric acid and obtainment of sulphuric raffinate and extract. Sulphuric acid is re-extracted with water from the extract, and sulphuric raffinate is supplied to leaching of the matte.

EFFECT: increasing the effectiveness of nickel matte processing method owing to extracting sulphuric acid in the form of additional product at simultaneous obtainment of metallic nickel K-1Ay; reducing nickel losses of its content in anolyte; reducing the number of reagents and simplifying the method.

10 cl, 1 dwg, 5 ex