METHOD OF HEAP LEACHING OF MINERAL RAW MATERIAL AT NEGATIVE TEMPERATURE Russian patent published in 2008 - IPC C22B3/08 

FIELD: metallurgy.

SUBSTANCE: method of heap leaching of mineral raw material at negative temperature includes feeding of water solution of sulphuric acid onto mineral raw material, stacked in heap on impervious bed, at that solution has concentration of more, than 51 g/dcm³ and contains ions of trivalent iron of concentration more, than 3 g/dcm³, then method includes collection and settling of productive solution, flowing out of heap. After settling there is performed oxidising of bivalent iron in productive solution, extraction of useful elements, returning of solutions after iron oxidising and extraction of useful elements for leaching of mineral raw materials.

EFFECT: implementation of process of heap leaching under permafrost conditions around year; increased calendar time for implementation of heap leaching; increased extraction of metals out of mineral raw material and reduction of time for extraction of useful elements.

11 cl, 2 ex