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Open AccessArticle

A Study of the Electrodeposition of Gold Process in Iodine Leaching Solution

School of Mining Engineering, Heilongjiang University of Science and Technology, Harbin 150022, China
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Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Metals 2020, 10(1), 50; https://doi.org/10.3390/met10010050
Received: 22 November 2019 / Revised: 19 December 2019 / Accepted: 23 December 2019 / Published: 26 December 2019
This paper mainly discusses electrodeposition of gold from iodine leaching solution through single-factor testing and explores the influence of gold concentration in catholyte, mass fraction of iodine in anolyte, anolyte n(I2):n(I), cell voltage, and electrolysis time on the percentage of gold deposition and coulombic efficiency. Moreover, a response surface methodology was adopted to study interactions among variables and influence on the percentage of gold deposition, with mass fraction of iodine in anolyte, anolyte n(I2):n(I), and cell voltage as variable factors and percentage of gold deposition as the response value. The electrodeposition process was fitted via pseudo first-order kinetics and pseudo second-order kinetics. Finally, the free surface morphology of gold deposited on the cathode plate was observed by scanning electron microscope. Given the results, a principal effect relationship can be concluded between mass fraction of iodine in anolyte, anolyte n(I2):n(I), cell voltage, and percentage of gold deposition, with cell voltage > anolyte n(I2):n(I) > mass fraction of iodine in anolyte and a second-order regression equation obtained with percentage of gold deposition as the response value. The optimized process conditions were gold concentration in catholyte 20 mg/L, mass fraction of iodine in anolyte 0.59%, anolyte n(I2):n(I) is 1:7.5, cell voltage 12.9 V, and electrolysis time 2 h. The average percentage of gold deposition of three confirmatory experiments was 96.43%, a figure very close to the predicted value of the model 97.76%, which proves that the quadratic polynomial model obtained by response surface methodology optimization is feasible and that the electrodeposition of gold process conforms to a pseudo second-order kinetic model. Au can be attached well to the cathode plate and the deposition layer is formed by granular grain accumulation. View Full-Text
Keywords: iodized leaching solution; electrodeposition method; percentage of gold deposition; response surface methodology; kinetic model; sedimentary morphology iodized leaching solution; electrodeposition method; percentage of gold deposition; response surface methodology; kinetic model; sedimentary morphology
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MDPI and ACS Style

Meng, Q.; Li, G.; Kang, H.; Yan, X.; Wang, H.; Xu, D. A Study of the Electrodeposition of Gold Process in Iodine Leaching Solution. Metals 2020, 10, 50.

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