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Journal of Mining Sciences

2019 year, number 4

Gold Leaching by Means of Humic Samples

A. V. Zashikhin, M. L. Sviridova
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia
Keywords: гуминовые кислоты, выщелачивание, золото, фракционирование, Humic acids, leaching, gold, fractionation

Abstract

The study results of gold leaching using the samples of humic acids, as well as stage-by-stage fractionation of the initial and gold-containing samples of these acids are presented. The gold content in the product solution was up to 14-30 mg/l. Сhemical analysis of the supernatant obtained by a stage change in pH of the solution and subsequent centrifugation determined that gold-bearing acids contain both organic and dissolved gold, which is stable to precipitation at pH 2. Fractionation of the initial humic acids and subsequent leaching of gold by its individual fractions slows down the dissolution kinetics, and the fractions distinguished at different pH vary significantly in their activity. The most active is the fraction obtained by centrifugation at pH 4.6. The spectrum is presented and the kinetics of gold dissolution by these acids modified by the cyanide complex is shown.