RESEARCH ON HYDROMETALLURGICAL PROCESSING OF DUMP SILVER-CONTAINING TAILINGS

Karimova L.M. Terentyeva I.V. Oleinikova T.O. Magaz A.A.
2023 Ivanovo State University of Chemistry and Technology

ChemChemTech
2023 #66 Issue 12 101 - 110. pp.

Silver leaching studies have been carried out using the Jin Chan reagent and sodium cyanide. Waste copper tailings with a silver content of 1.72 g/t were used as an object for research, and according to the phase analysis of copper, the sample is 79.79% represented by sulfide minerals, 20.21% - oxidized. The main ore mineral of the sample is magnetite; rare minerals - pyrite, chalcopyrite, iron hydroxides, hematite, chalcocite + digenite, covellite, rutile, ilmenite, bornite, pyrrhotite, sphalerite, malachite, azurite, molybdenite; single minerals - native copper. The effect of sodium cyanide concentration and Jin Chan reagent, leaching time, sample size, and temperature on the recovery of silver from a tailings sample was studied using the mathematical method of experiment planning. Particular dependences of the extraction of silver into solution are constructed on the basis of which a generalized equation is obtained. The results of comparative studies on the extraction of silver from waste tailings with solutions of the Jin Chan reagent and sodium cyanide in comparable concentrations (specific consumption is 0.9 kg/t of tailings) are practically on the same level. This allows us to consider Jin Chan as an environmentally friendly alternative to the leaching agent instead of the traditional sodium cyanide. The magnitude of the apparent activation energy during the extraction of silver into solution was determined, which was 2.42 kJ/mol for sodium cyanide and 3.26 kJ/mol for Jin Chan, which is typical for limiting the process by external gas-phase diffusion. Studies have been carried out on the desorption of silver with the extraction from a saturated ion exchanger into a desorbate by 98.5%. As a result of electrolytic deposition, a cathode deposit of silver sulfide was obtained with a recovery of 97.5%.

desorption , electrolysis , leaching , process rate , recovery , silver , tailings

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