Experimental Determination of Electrochemical Sorption/Desorption Properties of Gold(III) Ions
Mansurov Z.A. Supiyeva Z.A. Yeleuov M.A. Taurbekov A.T. Pavlenko V.V. Smagulova G.T.
May 2021Pleiades journals
Russian Journal of Non-Ferrous Metals
2021#62Issue 3257 - 264 pp.
Abstract: For the Republic of Kazakhstan, like for any country with a developed mining and processing sector, it is important to develop knowledge to improve methods and technologies for the complex processing of raw materials, including those for the more complete extraction of precious metals. This is needed due to the high loss of precious metals during their processing and separation and the need to improve the process of their concentration. Advances in the field of carbon nanomaterials offer great prospects for improving existing technologies for the extraction of precious metals from waste solutions and pulps. The goal of the work is to conduct comprehensive studies on the influence of the flow rate of solutions, pH, and the presence of ions of other metals on the extraction of gold on a carbon nanostructured material from rice husk (with its further regeneration and reuse). The effect of the pH of the solution on the degree of extraction of gold(III) ions is studied, it is found that the highest recovery for gold ions is observed at pH ~ 2. The selectivity of gold extraction is established in the combined presence of copper, nickel, and silver. The dependence of the electrochemical reduction sorption of gold on the flow rate of solutions is investigated. It is found that the optimal flow rate of solutions is 10 mL/min. The sorption capacity of the sorbent based on carbonized rice husk is calculated. The investigation into the electrochemical sorption/desorption of gold(III) ions showed that the desorption process proceeds better in an acetone/water/NaOH mixture; the degree of desorption is 96%, which demonstrates the possibility of regeneration of the carbon material of the electrode for reuse. The results can be applied to optimize the processes of extraction of precious metals from their solutions.
activated carbons , desorption , electrochemical sorption , noble metals
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Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Institute of Combustion Problems, Almaty, 050012, Kazakhstan
Satbayev University, Almaty, 050013, Kazakhstan
Al-Farabi Kazakh National University
Institute of Combustion Problems
Satbayev University
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