Consideration of Influential Factors on Bioleaching of Gold Ore Using Iodide-Oxidizing Bacteria
Consideration of Influential Factors on Bioleaching of Gold Ore Using Iodide-Oxidizing Bacteria
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DOI：
10.3390/min9050274
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发表时间：
2019-05-01
期刊：
影响因子：
2.5
通讯作者：
Tun, Myo Min
中科院分区：
文献类型：
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作者：
Khaing, San Yee;Sugai, Yuichi;Tun, Myo Min
碘氧化细菌（IOB）将碘氧化成碘和三碘，可用于金的溶解。因此，IOB可用于金浸出。本研究通过在含有海洋肉汤、碘化钾和金矿石的培养基中培养IOB的实验，考察了培养条件如营养物和碘化物的浓度、初始细菌细胞数、培养温度和振荡条件对金溶解性能的影响。金完全溶解所需的最低海洋肉汤和碘化钾浓度分别为18.7g/L和10.9g/L。当初始细菌细胞数为1 × 10（4）个细胞/mL或更高时，对金溶解没有影响。IOB浸金的最佳温度范围为30-35 ℃。振荡条件下的细菌生长速率比静态条件下快3倍。与静态孵育相比，振荡孵育有效地缩短了接触时间。根据培养液的pH值和氧化还原电位，本研究培养液中稳定的金络合物可命名为二碘化金（I）。
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 x 10(4) cells/mL or higher. Gold leaching with IOB should be operated under a temperature range of 30-35 degrees 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.