In this study, a finely ground nickel sulphide concentrate, consisting mainly of pyrrhotite, pentlandite and chalcopyrite, was leached in shake flask and batch reactor experiments. The objective was to determine the optimal method to recover nickel and cobalt, both hosted in pentlandite, and copper hosted in pentlandite and chalcopyrite respectively. The selected leaching methods tested were sulphuric acid leaching, ferric sulphate leaching and bioleaching. In addition, the effect of chloride ions on the leaching efficiency was evaluated with different concentrations. The results of the chemical leaching experiments showed increase in nickel, cobalt and copper recovery with chloride addition as a result of increased leaching rate for pentlandite and chalcopyrite. The highest yields in the 8-hour reactor experiment (70 % Ni, 66 % Co and Cu 87 %) were obtained in ferric sulphate leaching with chloride concentration of 20 g/L at the temperature of 90 °C. The mineralogical analysis showed that pyrrhotite was dissolved almost completely in all the experiments. Pentlandite and chalcopyrite leaching was clearly improved by the addition of Cl at similar temperatures.

中文翻译：

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化学和生物浸出方法的比较以及氯化物对从镍黄铁矿-磁黄铁矿精矿中回收镍、钴和铜的影响


在这项研究中，主要由磁黄铁矿、镍黄铁矿和黄铜矿组成的细磨硫化镍精矿在摇瓶和间歇反应器实验中浸出。目的是确定回收镍黄铁矿中镍和钴以及分别回收镍黄铁矿和黄铜矿中铜的最佳方法。所试验的浸出方法为硫酸浸出、硫酸铁浸出和生物浸出。此外，还评价了不同浓度氯离子对浸出效率的影响。化学浸出实验的结果表明，添加氯化物可提高镍、钴和铜的回收率，因为镍黄铁矿和黄铜矿的浸出率提高。在 8 小时反应器实验中，在氯化物浓度为 20 g/L、温度为 90 °C 的硫酸铁浸出中获得了最高产率（70% Ni、66% Co 和 Cu 87%）。矿物学分析表明，磁黄铁矿在所有实验中几乎完全溶解。在相似温度下添加 Cl 明显改善了镍黄铁矿和黄铜矿的浸出。