EXTRACTION METHOD OF GOLD FROM ORES AND PRODUCTS OF THEIR PROCESSING Russian patent published in 2013 - IPC C22B11/08 C22B3/24 

FIELD: metallurgy.

SUBSTANCE: extraction method of gold from ores and products of their processing involves preparation of pulp of crushed initial raw material, alkalisation of prepared pulp till pH value is 9.5-10.0, sorption leaching of gold with weak-basic anion-exchange resin from alkalised pulp containing sodium cyanide. Then, by means of separation of saturated anion-exchange resin there performed is gold resaturation of saturated anion-exchange resin with separation of resaturated anion-exchange resin and mother solution. After resaturation is completed, gold desorption is performed by means of a solution containing 25-30 g/l of sodium cyanide and 3-4 g/l of sodium hydroxide so that demetallised anion-exchange resin and marketable strippant is obtained. Some part of marketable strippant is supplied for gold resaturation stage of saturated anion-exchange resin, demetallised anion-exchange resin and some part of mother solution is supplied for stage of sorption leaching of gold, and the other part of mother solution is supplied for preparation of desorbing solution.

EFFECT: increase in capacity of saturated weak-basic anion-exchange resin as to gold and reduction of gold losses on natural sorbents; considerable reduction of content of impurities in marketable strippant; shortening of duration of cyanide leaching of gold from ore raw material without reduction of extraction degree of gold to a solution.

9 cl, 1 dwg, 4 tbl, 2 ex