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ArticleName A research on acid leaching of impurities from gold-containing cathode sediments
DOI 10.17580/tsm.2017.07.07
ArticleAuthor Zhmurova V. V., Nemchinova N. V., Mineev G. G.

Irkutsk National Research Technical University, Irkutsk, Russia:

V. V. Zhmurova, Assistant Professor of a Chair of Non-ferrous Metals Metallurgy, e-mail:
N. V. Nemchinova, Head of a Chair of Non-ferrous Metals Metallurgy, e-mail:
G. G. Mineev, Professor of a Chair of Non-ferrous Metals Metallurgy


Cathode sediments (KS), obtained as a result of industrial processing of complex gold-polymetallic raw materials, contain a considerable amount of impurity metals (copper, lead, zinc, iron, cobalt and others), which significantly increases the costs of the subsequent refining of materials. We carried out the experimental works on the preliminary acid treatment of KS with the aim of leaching the impurities and increasing the precious metals proportion. The investigation objects were cathode sediments that contained copper and nickel in the amount of 22.68 and 2.11% (by mass), respectively. Hydrochloric and nitric acids were tested as a solvent in our laboratory studies. For the selection of optimal leaching parameters, studies were carried out with different concentrations of the reagent (from 50 to 350 kg/m3) and the ratio of L:S = (3–7):1. The duration of the experiments was 2 hours; the experiments were carried out with intensive agitation and standard ambient temperature (25 °C). The leaching residue was washed with water and dried. The processing of the obtained experimental data was carried out with the help of the computer program STATISTICA 6.0. We chose the following factors of variation: acid concentration, solution temperature, ratio of liquid and solid phases. It was established that nitric acid purifies KS more effectively. After preliminary acid purification, the precious metals content in the leach residue increased, so SK corresponded to the Technical Requirements TU 117-2-3–78. As a result of semi-industrial tests on smelting of gold ligature ingots from KS samples (without and after their preliminary acid treatment), the losses of gold and silver with slags were reduced and ingots with a uniform structure were obtained. The mass fraction of precious metals in ingots increased by 2, which can significantly reduce the costs of their ensuing refining.

keywords Metallurgy, precious metals, cathode sediments, impurities, statistical analysis, three-factor experiment, refining

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