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Effect of anode compositions on the current efficiency of zinc electrowinning

Dashti, S ; Sharif University of Technology

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  1. Type of Document: Article
  2. Abstract:
  3. The main goals in zinc electrowinning process are decreasing of power consumption and increasing of current efficiency. The purpose of this research was to investigate effect of different alloy compositions used in production of lead-based anodes on the zinc electrowinning process. The anode compositions prepared and examined in this study were binary alloys Pb - (0.5 and 2 %) Ag and quaternary alloys Pb - 0.5 % Ag - 1 % Ca - 2 % Sn, Pb - 0.5 % Ag - 1 % Ca - 1 % Sn - 1 % Sb and Pb - 0.5 % Ag - 1 % Ca - 1 % Sn - 1 % Bi. The electrowinning experiments were conducted using a laboratory-scale apparatus, at a plating time of 4 hours, a current density of 500 to 1000 A/m2, industrial zinc sulfate electrolyte having zinc concentrations of 50 to 80 g/L and H 2SO4 concentrations of 150 to 180 g/L, respectively. In the experiments effect of mentioned parameters on current efficiency and surface morphological effect of the zinc deposits on the cathodes was investigated. Design of experiment, the Taguchi method has also been used to optimize the five factors (anode type, current density, temperature of electrolyte, sulfuric acid concentration, and Zn concentration in electrolyte) in the zinc electrowinning process. It was found that increasing the zinc and H2SO4 concentrations and having 750 A/m2 as the optimized value of current density increases the current efficiency
  4. Keywords:
  5. Power consumption ; Taguchi method ; Acid concentrations ; Alloy compositions ; Anode composition ; Current efficiency ; Investigate effects ; Morphological effects ; Zinc concentration ; Zinc electrowinning ; Binary alloys ; Calcium ; Current density ; Electric power utilization ; Electrodes ; Electrolytes ; Experiments ; Lead ; Metallurgy ; Optimization ; Silver ; Silver alloys ; Sulfur determination ; Taguchi methods ; Tin ; Zinc ; Fluidized bed combustion
  6. Source: Proceedings - European Metallurgical Conference, EMC 2011 ; Volume 2 , 2011 , Pages 387-396 ; 9783940276377 (ISBN)
  7. URL: http://www.linknovate.com/publication/effect-of-anode-compositions-on-the-current-efficiency-of-zinc-electrowinning-2473661