Extraction of copper from complex carbonaceous sulfide ore by direct high-pressure leaching
Extraction of copper from complex carbonaceous sulfide ore by direct high-pressure leaching
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DOI：
10.1016/j.mineng.2021.107181
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发表时间：
2021-11
影响因子：
4.8
通讯作者：
Labone L. Godirilwe;R. S. Magwaneng;Riku Sagami;Kazutoshi Haga;Altansukh Batnasan;S. Aoki;T. Kawasaki;H. Matsuoka;K. Mitsuhashi;M. Kawata;A. Shibayama
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作者：
Labone L. Godirilwe;R. S. Magwaneng;Riku Sagami;Kazutoshi Haga;Altansukh Batnasan;S. Aoki;T. Kawasaki;H. Matsuoka;K. Mitsuhashi;M. Kawata;A. Shibayama
铜矿石的杂质和复杂性的增加是采矿业最近面临的挑战之一。复杂的碳质硫化物矿石由于其矿物学复杂性以及有机碳和碳酸盐的杂质而极难处理。本研究重点开发湿法冶金工艺，从含有黄铜矿、碳酸盐（白云石和方解石）和碳质脉石矿物的复杂碳质硫化物矿石中高效提取铜。使用 XRD 和 EPMA 分析对矿石样品和浸出残渣进行表征，同时使用 ICP-OES 测定溶液中溶解的金属总量。对复杂碳质硫化矿进行含氧硫酸溶液高压浸出，研究了硫酸浓度、温度、总压、矿浆密度等浸出参数的影响。铜的萃取随着温度、硫酸浓度和总压的增加而增加。另一方面，矿浆密度的增加由于矿浆粘度和反应物扩散传质阻力的增加而导致铜提取率下降。通过控制浸出液（PLS）中的游离酸度可以实现铜从铁中的选择性溶解。在浸出条件：100 g/L、1 M H2SO4、160 °C、1.0 MPa 总压下，铜和铁的最高提取率分别为 97.55% 和 95.37%。研究了通过 NaSH 硫化从 PLS 中沉淀铜的情况，在 Cu: NaSH 摩尔比为 1:1.8 时回收了超过 99.9% 的铜。
The increase of impurities and complexity of copper ores are among the recent challenges in the mining industry. Complex carbonaceous sulfide ores are extremely difficult to treat due to their mineralogical complexity and impurities of organic carbon and carbonates. This study focuses on the development of a hydrometallurgical process for efficient copper extraction from complex carbonaceous sulfide ore which contains chalcopyrite, carbonates (dolomite and calcite), and carbonaceous gangue minerals. Characterization of the ore sample and leach residues was conducted using XRD and EPMA analysis, while ICP-OES was used for the determination of total dissolved metals in solution. High-pressure leaching of complex carbonaceous sulfide ore in oxygenated sulfuric acid solution was performed and the influence of leaching parameters such as sulfuric acid concentration, temperature, total pressure, and pulp density was studied. The extraction of copper increased with increasing temperature, sulfuric acid concentration, and total pressure. On the other hand, an increase in pulp density resulted in a decline in copper extraction due to an increased slurry viscosity and resistance in the diffusive mass transfer of reactants. Selective dissolution of copper from iron can be achieved by controlling free acidity in the pregnant leach solution (PLS). Under these leaching conditions: 100 g/L, 1 M H2SO4, 160 °C, 1.0 MPa total pressure, the highest copper and iron extractions achieved were 97.55% and 95.37%, respectively. Precipitation of copper from the PLS by NaSH sulfidization was investigated and more than 99.9% of copper was recovered at a Cu: NaSH molar ratio of 1:1.8.