To obtain fundamental information on the dissolution of cobalt into alumina-saturated MnO-SiO2-Al2O3 slags in the smelting reduction of spent lithium-ion batteries, the equilibrium distribution of cobalt between Co-Cu alloys and alumina-saturated MnO-SiO2-Al2O3 slags was measured at 1573 K and 1623 K under a controlled CO-CO2 atmosphere. The results show that (i) the solubility of cobalt in the slag increased with increasing concentration of cobalt in the alloy and increasing oxygen partial pressure in the atmosphere at a fixed concentration of cobalt in the alloy, and (ii) the activity coefficient of CoO in the slag increased with increasing cobalt oxide in the slag. The activity coefficient of CoO in the slag, γCoO, referred to as solid CoO, can be described as a function of the concentration of CoO in slag as follows: γCoO = 11.2957(wt pct CoO in slag) + 12.0944 (1573 K, (wt pct MnO)/(wt pct SiO2)= 0.76–0.83); γCoO = 2.2286(wt pct CoO in slag) + 4.5232 (1623 K, (wt pct MnO)/(wt pct SiO2)= 0.78–0.85).

中文翻译：

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Co-Cu合金与饱和氧化铝MnO-SiO2-Al2O3渣中钴的分布

为了获得在废锂离子电池熔炼还原过程中钴溶解到饱和氧化铝-SiO2-Al2O3渣中的基本信息，钴在Co-Cu合金和饱和氧化铝-SiO2-Al2O3渣之间的平衡分布在受控的 CO-CO2 气氛下在 1573 K 和 1623 K 下测量。结果表明，(i) 在合金中钴浓度固定的情况下，随着合金中钴浓度的增加和气氛中氧分压的增加，钴在渣中的溶解度增加，以及 (ii) CoO 的活度系数渣中的氧化钴随着渣中氧化钴的增加而增加。炉渣中 CoO 的活度系数 γCoO，简称固体 CoO，可以描述为炉渣中 CoO 浓度的函数，如下所示：γCoO = 11。2957（渣中 CoO 重量百分比）+ 12.0944（1573 K，（MnO 重量百分比）/（SiO2 重量百分比）= 0.76–0.83）；γCoO = 2.2286（炉渣中的重量百分比 CoO）+ 4.5232（1623 K，（重量百分比 MnO）/（重量百分比 SiO2）= 0.78–0.85）。