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Consideration of Influential Factors on Bioleaching of Gold Ore Using Iodide-Oxidizing Bacteria

1
Department of Earth Resources Engineering, Graduate School of Engineering, Kyushu University, Fukuoka 8190395, Japan
2
Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka 8190395, Japan
3
Department of Geology, Yadanabon University, Mandalay 05063, Myanmar
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(5), 274; https://doi.org/10.3390/min9050274
Received: 11 April 2019 / Revised: 29 April 2019 / Accepted: 30 April 2019 / Published: 2 May 2019
(This article belongs to the Special Issue Recent Advances in Hydro- and Biohydrometallurgy)
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Abstract

Iodide-oxidizing bacteria (IOB) oxidize iodide into iodine and triiodide which can be utilized for gold dissolution. IOB can be therefore useful for gold leaching. This study examined the impact of incubation conditions such as concentration of the nutrient and iodide, initial bacterial cell number, incubation temperature, and shaking condition on the performance of the gold dissolution through the experiments incubating IOB in the culture medium containing the marine broth, potassium iodide and gold ore. The minimum necessary concentration of marine broth and potassium iodide for the complete gold dissolution were determined to be 18.7 g/L and 10.9 g/L respectively. The initial bacterial cell number had no effect on gold dissolution when it was 1 × 104 cells/mL or higher. Gold leaching with IOB should be operated under a temperature range of 30–35 °C, which was the optimal temperature range for IOB. The bacterial growth rate under shaking conditions was three times faster than that under static conditions. Shaking incubation effectively shortened the contact time compared to the static incubation. According to the pH and redox potential of the culture solution, the stable gold complex in the culture solution of this study could be designated as gold (I) diiodide. View Full-Text
Keywords: iodide-oxidizing bacteria; bioleaching; gold; iodide; iodine; triiodide; gold diiodide iodide-oxidizing bacteria; bioleaching; gold; iodide; iodine; triiodide; gold diiodide
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Khaing, S.Y.; Sugai, Y.; Sasaki, K.; Tun, M.M. Consideration of Influential Factors on Bioleaching of Gold Ore Using Iodide-Oxidizing Bacteria. Minerals 2019, 9, 274.

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