METHOD FOR PROCESSING RESISTANT GOLD-CONTAINING ORES AND CONCENTRATES

Abstract

The invention relates to hydrometallurgical methods for processing refractory gold-bearing ores and concentrates, sludge, in which precious metals are associated with oxides of manganese, copper, lead, nickel. The method consists in processing the initial crushed material with acids (hydrochloric, sulfuric, nitric, hydrobromic, hydroiodic) with the introduction or maintenance of the total concentration of manganese oxides in terms of manganese dioxide 3 - 6 wt % in the presence of a complexing agent (chlorine ion, bromine ion, iodine ion) at T:W=(4-5) at a temperature of 343 – 363 K and a time of 30 - 90 minutes with the transfer of gold and silver into solution. the source material containing manganese of the lowest oxidation states is preliminarily calcined in air at a temperature of 800–825 K, and when processing gold and silver-containing concentrates with a silver content of more than 1 kg/t, selective leaching of silver, the remaining solid phase, is first carried a silver without concentration of less than 1 kg/t is sent for hydrometallurgical processing. To simplify the separation of the solution from the solid phase, ion-exchange sorbents are introduced into the pulpthe technical result of the invention is the creation of an environmentally friendly process for extracting gold and silver from ore, ore concentrates and other refractory materials by replacing the traditional cyanide leaching process with the use of mineral acids, in particular hydrochloric, sulfuricor nitric acids, as well as improving the technical and economic indicators of the process by reducing technological operations and reducing energy intensity.