Almalyk Branch of the Tashkent State Technical University, Almalyk, Republic of Uzbekistan

D. B. Holikulov, Deputy Director for Research and Innovation1, Doctor of Technical Sciences, Professor, e-mail: doniyor_xb@mail.ru

JSC Navoi Mining & Metallurgy Company, Mining Administration Kyzylkum, Navoi, Republic of Uzbekistan
R. I. Normurotov, Chief Engineer of the Innovation and Technical Service, Candidate of Technical Sciences, Associate Professor, e-mail: R.Normurotov@ngmk.uz

Navoi State University of Mining and Technologies, Navoi, Republic of Uzbekistan
M. I. Shonazarov, Assistant of the Department of Metallurgy, e-mail: munisshonazarov@mail.ru

Studies have been conducted on the extraction of precious metals from the magnetic fraction (MF) by the processes of hydrochlorination and chloridation. As a result of the experiments, gold extraction during hydrochlorination was 65%, and during chloridation — 97.7%. The chemical, granulometric and phase composition of gold-containing MF was studied. Studies on oxidative roasting of gold-bearing MF have been conducted. An increase in the efficiency of extraction of precious metals during hydrochlorination and chloridation has been established due to preliminary oxidative roasting of MF at a temperature of 700 ^oC, which makes it possible to remove arsenic, antimony, sulfur and convert iron into a non-chlorinated form. The effect of NaCl and NaClO concentrations and the duration of the process on the degree of gold extraction during gold hydrochlorination from MF has been studied. The negative effect of iron on the selectivity of gold extraction from MF during the hydrochlorination process was revealed, expressed by the reverse reduction of gold from solution by iron transferred to solution. The degree of gold dissolution was 65%. The behavior of different chlorinators in the process of chlorination roasting is investigated. A synergistic effect of increasing the degree of gold and silver chlorination during the chloridation of MF due to the use of a mixture of NaCl + CaCl₂ as a chlorinator has been established. Kinetic and thermodynamic patterns of behavior of non-ferrous metals, precious metals and iron during chloridation have been studied, and the influence of temperature and duration of the process on the degree of extraction of precious metals has been determined. The optimal parameters of chloridation were determined: temperature — 1050–100 ^oC, duration — 3 hours, chlorinator — a mixture of NaCl + CaCl₂ (1:1) in an amount of 15% of the mass of raw materials.

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