METHOD FOR CLOSELY GROUPED LIXIVIATION OF METALS UNDER CONDITIONS OF PERMAFROST Russian patent published in 2004 - IPC

FIELD: mining industry.

SUBSTANCE: method includes removal of soil from portion meant for construction of stack, placement of anti-filter base, placement of equipment for draining productive solution, placement of lixiviated rock solids onto prepared base and feeding reagents solutions into stack. In stack base a layer of rough broken rocks is placed, covered by anti-filter cover on the sides, in the middle of layer a membrane is placed for letting through or delaying productive solution. Into reagent solution admixtures are injected - easily soluble salts of univalent metals having low eutectics temperature, which do not engage in reactions with working reagents and possible intermediate products of chemical reactions, to concentration, close to saturation. Then productive solution and admixtures solution are drained separately, concentration of the latter is increased up to starting concentration determined by used technology, and again the latter is pumped into stack of lixiviated rock solids.

EFFECT: possible separate draining of product solution and admixtures.