期刊
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
卷 28, 期 6, 页码 956-964出版社
SPRINGER
DOI: 10.1007/s12613-020-2142-9
关键词
thiourea leaching; stability; pyrite; refractory gold ores
类别
资金
- National Natural Science Foundation of China [51922108]
- Hunan Natural Science Foundation [2019JJ20031]
- Hunan Key Research and Development Program [2019SK2061]
The presence of pyrite in thiourea leaching systems significantly accelerates the decomposition rate of thiourea, affecting the stability of the system. After removing sulfide by roasting, the gold recovery efficiency increased significantly. Efforts to improve the efficiency of gold recovery are hindered by the high consumption of thiourea caused by the presence of impurities like pyrite in the ores.
The extraction of gold from refractory gold ores (RGOs) without side reactions is an extremely promising endeavor. However, most RGOs contain large amounts of sulfide, such as pyrite. Thus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs. In this work, the effects of pyrite on the stability of the thiourea system were systematically investigated under different conditions. Results showed that the decomposition rate of thiourea was accelerated sharply in the presence of pyrite. The effect of pyrite on gold recovery in thiourea leaching systems was then confirmed via a series of experiments. The decomposition efficiency of thiourea decreased by 40% and the recovery efficiency of gold increased by 56% after the removal of sulfide by roasting. Under optimal conditions, the efficiency of the gold recovery system increased to 83.69% and only 57.92% of thiourea decomposition was observed. The high consumption of thiourea by the leaching system may be attributed to not only adsorption by mineral particles but also catalytic decomposition by some impurities in the ores, such as pyrite and soluble ferric oxide.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据