EXTRACTION METHOD OF NICKEL FROM OXIDISED NICKEL ORES Russian patent published in 2011 - IPC C22B23/00 C22B3/08 

FIELD: metallurgy.

SUBSTANCE: method involves heap leaching of nickel with sulphuric acid solution, neutralisation of production solution, sorption of nickel on ionite from it, processing of strippant so that nickel is obtained, supply of raffinate solution for heap leaching of ore during its revolution and circulation. At that, some part of raffinate is subject to neutralisation with lime milk and its cleaning from impurities of iron, manganese and magnesium by directing in the form of neutralised pulp to waste heap for deposition of iron, manganese and magnesium on it with further mixing with the main volume of cycling solution of raffinate and final strengthening with sulphuric acid. Volume of some part of raffinate, which is subject to neutralisation and cleaning, as per the amount of iron, manganese and magnesium, corresponds to their transition to production solution during leaching of nickel from the ore during circulation of cycling solution.

EFFECT: simplifying the utilisation process of iron, manganese and magnesium and heap leaching process of nickel.

1 dwg, 1 tbl