In study alternative cementation process with using manganometry for removing Cobalt from ZnSO4 solution

Vahidfard, Vahid (2020) In study alternative cementation process with using manganometry for removing Cobalt from ZnSO4 solution. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Research Aim: To produce zinc by electrolysis solution hydrometallurgy must be free of harmful impurities such as cobalt, nickel and cadmium. In Iran's zinc industry, cobalt is purified by manganometry and nickel and cadmium by zinc powder cementation from zinc electrolyte solution. Manganometry in addition to cobalt also eliminates manganese, which is a useful element for electrolysis. Potassium permanganate also causes an explosive reaction in acidic environments and has a low efficiency in the removal of cobalt from the electrolyte solution. Therefore, the aim of this study was to study the method of cementation with zinc powder and antioxidant trioxide additive for replacement with manganometry process in Iran zinc industry. Research method: In this study, Ditch zinc smelter filtration solution was prepared. First, the method of manganometry and its effective parameters were investigated. The cementation method was then performed by adding certain amounts of zinc powder and antioxidant trioxide to the 1 liter reactor. The effective parameters on cobalt removal process were investigated by cementation method. Findings: The mechanism was first studied, resulting in a comprehensive mechanism. Investigation of the parameters affecting the manganometry process showed that the addition of lime had no effect on cobalt removal while potassium permanganate concentration was very effective on cobalt removal efficiency. In the study of cementation method, first, the mechanisms proposed for cobalt removal by zinc powder and antimony trioxide were studied, and none of these mechanisms could completely justify the cobalt removal process. In this study, the mechanism of cobalt removal by zinc powder and tetroxide antimony was investigated which resulted in a comprehensive mechanism for cobalt removal from electrolyte solution. Investigation of the parameters affecting cobalt removal showed that the cementation method is able to remove all three impurities of cobalt, nickel and cadmium in one step. Investigation of the effect of copper sulfate showed that its addition to zinc electrolyte solution in the presence of cadmium had a negative effect on the cobalt removal efficiency, while the proper granulation of the powder had a very favorable effect on the process. Conclusion: Both cementation and manganometry processes were optimized in vitro and the results showed that cementation can eliminate cobalt, nickel and cadmium simultaneously. Also, due to the lack of manganese removal in the cementation process, the addition of manganese sulfate in the electrolysis part does not occur. In economics, due to the removal of potassium permanganate and lime in hot filtration as well as manganese sulfate in electrolysis, reducing the process time, eliminating the cold filtration step and extending the life of the anodes, the cementation process is much more economical than manganometry. . There is no need to change the factory production line for the cementation process on the factory production line, and no special equipment is needed. In addition, in the hot treatment section, potassium permanganate and lime are eliminated and the two-by-one conversion process can be further enhanced. Therefore, the cementation process in the Dundee plant is feasible and in addition to increasing production capacity with available facilities, production costs are significantly reduced.

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