Features of the discharge of zinc in the background solution of sodium sulphate under stirring conditions
Abstract
The production technology of hydrometallurgical zinc uses various surfactants to thicken pulps, stabilise the electrolysis process, and obtain high-quality cathode deposits. Numerous researches were conducted to study the cathodic and anodic processes in a wide range of the composition of aqueous solutions using various solid electrodes in the absence of intense stirring of the electrolyte and with a high contribution of the migration component of the discharge of metals. This approach to the study of the surfactants’ influence rarely provided a high degree of statistical reliability in observing the effect of differently charged surfactants on electrode processes, which is of great importance in the hydrometallurgical production of zinc. In this work, the task was to practically eliminate the contribution of the migration component due to the following
factors: conducting electrolysis in a background solution of sodium sulphate, organising electrolyte stirring, performing calculations of current densities at the beginning of electrolysis, and establishing polarisation curves at an increased potential sweep rate from 20 to 100 mV/s. This approach provided a greater degree of statistical reliability in presenting the mechanism of the effect of additions of cationic and anionic surfactants during the stage of zinc discharge on a solid electrode, which was the purpose of the article.
Electrolysis was conducted in the potential range from -1050 to -1250 mV relative to the silver chloride electrode (AgCl/Ag) in the presence of a background sodium sulphate solution (0.5 M of Na2SO4 solution) containing 0.005, 0.0125, and 0.025 M ZnSO4 with the introduction of high-molecular surfactants: cationic and anionic coagulants (flocculants) and foaming agents (lignosulphonate – LSTP).
During the electrolysis in a background solution of sodium sulphate with stirring, it was found that the process of discharge of zinc ions on a solid electrode occurs in a mixed-kinetic mode. It was shown that positively charged additives, such as lignosulphonate and cationic coagulant (flocculant) Besfloc K6645, have a negative effect on the dynamics of zinc cation discharge, while negatively charged Besfloc K4034 has practically no effect. The approach proposed in this work allows evaluating the influence of additions of cationic and anionic surfactants on the stage of zinc discharge on a solid electrode, which was the practical and scientific value of this work
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References
Kolesnikov A. V., Kozlov P. A. Electrolysis of zinc in sulfate solutions. Tsvetnye Metally. 2018;(8): 45–49. https://doi.org/10.17580/tsm.2018.08.05 (In Russ., abstract in Eng.)
Ivanov I., Stefanov Y. Electroextraction of zinc from sulphate electrolytes containing antimony ions and hydroxyethylated-butyne-2-diol-1,4: Part 3. The influence of manganese ions and a divided cell. Hydrometallurgy. 2002;64(3): 181–186. https://doi.org/10.1016/s0304-386x(02)00039-7
Stefanov Y., Ivanov I. The influence of nickel ions and triethylbenzylammonium chloride on the electrowinning of zinc from sulphate electrolytes containing manganese ions. Hydrometallurgy. 2002;64(3): 193–203. https://doi.org/10.1016/s0304-386x(02)00037-3
Kolesnikov A. V. Investigations of the influence of di-2-ethyl-hexyl phosphoric acid on the parameters of electrolysis of zinc from acidic solutions. Butlerov Communications. 2018;55(8): 127–133. Available at: https://www.elibrary.ru/item.asp?id=35659982 (In Russ., abstract in Eng.)
Kolesnikov A. V., Kozlov P. A., Fominykh I. M. Investigations of the influence of white spirit on the parameters of electrolysis of zinc from acidic solutions. Butlerov Communications. 2018;55(8): 120–126. Available at: https://w w w.elibrar y.ru/item.asp?id=35659981 (In Russ., abstract in Eng.)
Karavasteva M. The effect of some surfactants on the dissolution of zinc in sulfuric acid solutions containing ions of metallic impurities. Canadian Metallurgical Quarterly. 2004;43(4): 461–468. https://doi.org/10.1179/cmq.2004.43.4.461
Kolesnikov A. V. The electroreduction are investigated zinc from the background solution of sodium sulfate in the presence of cationic and anionic flocculants. Butlerov Communications. 2017;49(2): 130–136. Available at: https://www.elibrary.ru/item.asp?id=29197189 (In Russ., abstract in Eng.)
Ivanov I. Increasing the current efficiency during zinc electroextraction in the presence of metal impurities by a d ding organic in hibitors. Hydrometallurgy. 2004;72(1-2): 73–78. https://doi.org/10.1016/S0304-386X(03)00129-4
Tripathy B. C., Das S. C., Misra V. N. Effect of antimony(III) on the electrocrystallisation of zinc from sulphate solutions containing SLS. Hydrometallurgy. 2003;69(1-3): 81–88. https://doi.org/10.1016/S0304-386X(02)00204-9
Kolesnikov A. V. Сopper recovery of zinc metal in aqueous solutions in the presence of high surfactant. Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases. 2016;18(1): 46–55. Available at: https://journals.vsu.ru/kcmf/article/ view/107/128 (In Russ., abstract in Eng.)
Krstajic N. V., Grgur B. N., Mladenovic N. S., Vojnovic M. V., Jaksic M. M. Determination of the kinetic parameters of hydrogen evolution. Electrochimica Acta. 1997;42(2): 323–330.
https://doi.org/10.1016/0013-4686(96)00188-0
Tseluykin V. N., Koreshkova A. A., Invalid O. G., Tseluykina G. V., Solovieva N. D. Electrodeposition and properties of zinc composite coatings modified by carbon nanotubes. .Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases. 2013;15(4): 466–469. Available at: https://journals.vsu.ru/kcmf/article/view/936/1018 (In Russ.)
Sapronova L. V., Sotskaya N. V., Dolgikh O. V. Kinetics of electrodeposition of nickel from complex electrolytes containing amino acids. Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases. 2013;15(4): 446–452. Available at: https://journals.vsu.ru/kcmf/article/view/933/1015 (In Russ.)
Kolesnikov A. V., Kazanbaev L. A., Kozlov P. A. Influence of organic substances on cementation and zinc electrolysis processes. Tsvetnye Metally. 2006;(8): 24–28. Available at: https://www.elibrary.ru/item.asp?id=9245180 (In Russ., abstract in Eng.)
Kichigin V. I., Shein A. B. Effect of anodization on the kinetics of the hydrogen evolution on cobalt silicides in sulfuric acid solution. Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases. 2017;19(3): 359–367. https://doi.org/10.17308/kcmf.2019.21/2365 (In Russ., Abstract in Eng.)
Skibina L. M., Duran Delgado O. A., Sokolenko A. I. Kinetics of electrodeposition and surface morphology of cadmium and organo-cadmium coatings containing e-caprolactan. Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases. 2017;19(3): 430–440. Available at: https://doi.org/10.17308/kcmf.2017. 19/220 (In Russ., abstract in Eng.)
Kondrashin V. Yu., Shafrova M. F. Copper dissolution in persulfate environment at cathodic potentials. Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases. 2017;19(4): 517–522. https://doi.org/10.17308/kcmf.2017.19/230 (In Russ., abstract in Eng.)
Galyus Z. Theoretical foundations of electrochemical analysis. Moscow: Mir Publ.; 1974. 552 p. (In Russ.)
Alfantazi A. M. An investigation on the effects of orthophenylene diamine and sodium lignin sulfonate on zinc electrowinning from industrial electrolyte. Hydrometallurgy. 2003;69(1-3): 99–107.
https://doi.org/10.1016/s0304-386x(03)00030-6
Kolesnikov A. V., Fominykh I. M. Parameters of electrolysis of zinc sulfate solutions. Butlerov Communications. 2017;51(8): 89–97. Available at: https://www.elibrary.ru/item.asp?id=30506038 (In Russ., abstract in Eng.)
Solmaz R., Kardas G., Yazici B., Erbil M. Adsorption and anticorrosive properties of 2-amino-5-mercapto-1,3,4-thiadiazole on mild steel in hydrochloric acid media Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2008;(312): 7–17. https://doi.org/10.1016/j.colsurfa.2007.06.035
Kolesnikov A. V. Cathodic and anodic processes in zinc sulfate solutions in the presence of surfactants. ChemChemTech. 2016;59(1): 53–57. Available at: https://www.elibrary.ru/item.asp?id=25501669 (In Russ)
Minin I. V., Solovyova N. D. Kinetics of zinc electroreduction from the sulfate electrolyte in the presence of surfactant additives. Vestnik Saratovskogo tekhnicheskogo universiteta. 2013;69(1): 58–60.Available at: https://www.elibrar y.ru/item.asp?id=19415711 (In Russ., abstract in Eng.)
Rotinyan A. L., Tikhonov K. I., Shoshina I. A. Theoretical electrochemistry. Leningrad: Khimiya Publ.; 1981. 424 p. (In Russ.)
Atkins P. Physical chemistry. New York: W. H. Freeman; 2002.
Skorcheleti V. V. Theoretical electrochemistry. Ed. 4th, rev. and add. Leningrad: Khimiya Publ; 1974. 567 p. (In Russ.)
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