METHOD OF EXTRACTION METALS OUT OF COMPLEX ORES, CONTAINING PRECIOUS METALS Russian patent published in 2008 - IPC C22B11/00 C22B3/18 

FIELD: metallurgy.

SUBSTANCE: invention refers to hydro metallurgical method of extracting metals out of complex minerals and can be used at processing of bases and below-line ores, containing non-ferrous and precious metals. The method of extracting metals out of containing precious metals complex ores includes at the first stage close leaching by means of supplying water solution of sulphuric acid onto the heap of ore piled on a water-proof base till the concentration of acid in the solution after leaching reaches not less, than 1.5 g/dcm², at the second stage water solution of sulphuric acid containing ions of trivalent iron of concentration not less, than 3 g/l, iron oxidising bacteria and micro elements is supplied. At the third stage of leaching water is supplied till neutralisation of the solution flowing out of the pile, at the fourth stage there is supplied alkaline solution of cyanide at pH of 10-12. At each stage productive solutions flowing out of the pile are collected and settled, then metals are extracted and solutions are returned into a corresponding stage for leaching of ore.

EFFECT: increased complexity of raw material utilisation and of extraction of metals out of ore.

10 cl, 2 ex