Development of approaches to the creation of technology for extracting "invisible" gold from the ores of the Sukhoe deposit (Primorye)

Abstract

In the south of the Far East, a large deposit of Sukhoe gold has been identified, where the noble metal is in a dispersed form, being present in the form of microscopic particles, or entering the structure of sulfide minerals. It was found out that the «invisible» (nano) form of finding gold is mainly associated with pyrite and arsenopyrite. To develop a technology for extracting a useful component, the completeness and convenience of opening the stone material with the transfer of all components into a solution is crucial. The article presents the results of a study of the possibility of preparing samples of mineral raw materials for the analytical determination of the elemental composition by thermal treatment of samples with a mixture of ammonium hydrodifluoride NH4HF2 and ammonium sulfate (NH4)2SO4. Based on a comparative analysis, it was shown that when using a mixture of ammonium hydrodifluoride with ammonium sulfate, it is possible to more fully open the mineral raw materials compared to using only ammonium hydrodifluoride. A mixture of NH4HF2 with (NH4)2SO4 is recommended as a new promising reagent for the decomposition of ores with "invisible" gold.