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Study on gold concentrate leaching by iodine-iodide |
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| Authors: | Hai-xia Wang Chun-bao Sun Shao-ying Li Ping-feng Fu Yu-guo Song Liang Li Wen-qing Xie |
| Affiliation: | 1730. Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing, 100083, China 2730. China Gold Association, Beijing, 100011, China 3730. Shuangqishan Gold Mine, Fujian, 362509, China |
| Abstract: | Gold extraction by iodine-iodide solution is an effective and environment-friendly method. In this study, the method using iodine-iodide for gold leaching is proved feasible through thermodynamic calculation. At the same time, experiments on flotation gold concentrates were carried out and encouraging results were obtained. Through optimizing the technological conditions, the attained high gold leaching rate is more than 85%. The optimum process conditions at 25°C are shown as follows: the initial iodine concentration is 1.0%, the iodine-to-iodide mole ratio is 1:8, the solution pH value is 7, the liquid-to-solid mass ratio is 4:1, the leaching time is 4 h, the stirring intensity is 200 r/mim, and the hydrogen peroxide consumption is 1%. |
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