METHOD TO PROCESS GOLD-CONTAINING ORES WITH MERCURY ADMIXTURE Russian patent published in 2013 - IPC C22B11/08 C22B3/44 C22B43/00 

FIELD: mining.

SUBSTANCE: method includes grinding of initial material, cyanide leaching with production of a product solution of gold with mercury admixtures, introduction of a sulfide-containing reagent for mercury deposition, sorption of gold onto activated coal with return of the reuse cyanide solution for leaching, desorption of gold and electrolysis of gold from a strippant. The sulfide-containing reagent is introduced in the form of an aqueous solution of a mixture of sodium sulfide and calcium oxide at their mass ratio of 4.3-4.4 per 900-1100 wt parts of the reuse cyanide solution. After separation of mercury in the form of a sparingly soluble residue, the suspension is separated to produce a clarified solution, from which the gold is adsorbed onto activated coal.

EFFECT: practically complete separation of mercury without negative impact at gold sorption.

4 cl, 1 dwg, 1 ex