METHOD OF GOLD EXTRACTION FROM GRAVITY CONCENTRATES Russian patent published in 2012 - IPC C22B11/08 

FIELD: metallurgy.

SUBSTANCE: method consists in filling the reactor with concentrate and gold leaching by way of cyanide solution circulation that leaches gold in reactor with supply of compressed oxygen used as oxidising agent. Note that compressed oxygen is supplied to reaction zone through dispergator directly before the reaction zone under pressure exceeding the pressure of cyanide solution supply into reactor by not less than 0.05 atm. Leaching is carried out at maintaining the content of dissolved oxygen in cyanide solution at a level 5-10 mg/l and analysing the gold content in solution every hour. After repeating the analysis results for gold content within 1 hour of constant value the leaching process is stopped via the stop of compressed air supply.

EFFECT: reduction of leaching time and increase of gold extraction into solution.

2 cl, 1 tbl, 1 ex