Co(II) is effective in catalyzing gold thiosulfate leaching, but Co(III) has seldom been adopted directly as the catalyst. This paper examined the effect of hexaamminecobalt(III) on the thiosulfate leaching of gold from a concentrate calcine and the gold recovery via resin adsorption from the leach solution. Under the leaching solution conditions, the Co(NH₃)₆³⁺/Co(NH₃)_x²⁺ (x = 4, 5) redox couple is thermodynamically formed playing the catalytic role. Experimental results verify the catalysis of Co(NH₃)₆³⁺, which is better than that of Co(II) and Cu(II) in thiosulfate leaching of gold. Replacing Cu(II) by Co(NH₃)₆³⁺ or Co(II), the thiosulfate consumption was significantly reduced and the complex two-stage gold elution process was simplified to a low-cost one-stage process. Compared with Co(II), Co(NH₃)₆³⁺ that is already the oxidant could shorten the leaching time from 8 h to 6 h without affecting the gold extraction (~80%). In addition, the thiosulfate consumption was further lowered from 18.8 kg·t^-1_ore to 15.0 kg·t^-1_ore under the catalysis of Co(NH₃)₆³⁺, which was confirmed by the X-ray photoelectron spectroscopy (XPS) analysis. Based on the thermodynamic analysis, the decrease of thiosulfate consumption may result from the formation of a lower concentration of the mixed-ligand Co(III) complexes such as Co(NH₃)_x(S₂O₃)⁺ (x = 4, 5). Gold recovery results suggested that, comparing Co(NH₃)₆³⁺ with Co(II), the gold in the Co(NH₃)₆³⁺ catalyzed leaching solution could be recovered more efficiently by resin adsorption. Therefore, Co(NH₃)₆³⁺ is a catalyst more efficient than Co(II) and has promise to replace Cu(II) in the extraction and recovery of gold from its ores by thiosulfate leaching and resin adsorption.

Co(II) 在催化硫代硫酸金浸出方面是有效的，但 Co(III) 很少被直接用作催化剂。本文研究了六氨合钴 (III) 对从精矿煅烧中硫代硫酸盐浸出金和通过树脂从浸出溶液中吸附回收金的影响。在浸出液条件下，Co(NH ₃ ) ₆ ³⁺ /Co(NH ₃ ) _x ²⁺ ( x  = 4, 5)氧化还原对在热力学上形成，起到催化作用。实验结果验证了Co(NH ₃ ) ₆ ³⁺对硫代硫酸盐浸金的催化作用优于Co(II)和Cu(II)。用 Co(NH) 代替 Cu(II)₃ ) ₆ ³⁺或Co(II)，硫代硫酸盐消耗量显着降低，复杂的两段金洗脱工艺简化为低成本的单段工艺。与Co(II)相比，Co(NH ₃ ) ₆ ³⁺已经是氧化剂，可以将浸出时间从8小时缩短到6小时，而不会影响金提取（~80%）。此外，在Co(NH ₃ ) ₆ ³⁺的催化下，硫代硫酸盐消耗量从18.8 kg·t ^-1_矿石进一步降低到15.0 kg·t ^-1_矿石X 射线光电子能谱 (XPS) 分析证实了这一点。根据热力学分析，硫代硫酸盐消耗的减少可能是由于形成了较低浓度的混合配体 Co(III) 配合物，例如 Co(NH ₃ ) _x (S ₂ O ₃ ) ⁺ ( x  = 4, 5）。金回收率结果表明，Co(NH ₃ ) ₆ ³⁺与Co(II)相比，Co(NH ₃ ) ₆ ³⁺催化浸出液中的金可以通过树脂吸附得到更有效的回收。因此，Co(NH ₃ ) ₆ ³⁺ 是一种比 Co(II) 更有效的催化剂，并有望在通过硫代硫酸盐浸出和树脂吸附从其矿石中提取和回收金中替代 Cu(II)。