Gold solubility in the CaO-SiO₂-Al₂O₃-Fe₂O₃ slag system was measured at 1723 K under an oxidizing atmosphere. Gold solubility in the present slag system increased with increasing slag basicity, which was quantified by the Vee ratio (= CaO/SiO₂), theoretical optical basicity, and activity of CaO. However, the effect of Fe₂O₃ and Al₂O₃ on gold solubility was negligible. From the thermodynamic assessment, it was found that gold was stabilized as the AuO⁻ (aurate) complex ion, and thus the dissolution reaction into the slag was proposed. The aurate capacity was originally defined from the dissolution reaction. The iso-Au solubility contours were plotted in the CaO-Fe₂O₃-(SiO₂ + Al₂O₃) pseudo-ternary diagram, from which the lower content of CaO can be proposed to be useful for higher recovery of gold (i.e., lower solubility) based on the thermodynamic view during pyrometallurgical processing of gold-containing E-waste materials. However, because the viscosity of the slag increases by decreasing the content of CaO, the operating window for best practice should be carefully proposed by considering the physicochemical properties of molten slag.

在氧化气氛下于1723K下测量了CaO-SiO ₂ -Al ₂ O ₃ -Fe ₂ O ₃炉渣系统中的金溶解度。随着矿渣碱度的增加，本炉渣系统中的金溶解度增加，这通过Vee比（= CaO / SiO ₂），理论光学碱度和CaO活性来量化。然而，Fe ₂ O ₃和Al ₂ O ₃对金溶解度的影响可以忽略不计。从热力学评估，发现黄金稳定的友达^- （aurate）离子，因此提出了溶解到炉渣中的反应。最初的金酸盐容量是由溶解反应定义的。在CaO-Fe ₂ O _3-（SiO ₂  + Al ₂ O ₃）拟三元图中绘制了iso-Au溶解度等值线，从中可以提出，较低的CaO含量可用于更高的金回收率（ （例如较低的溶解度）基于含金电子废物材料的火法冶金加工过程中的热力学观点。但是，由于炉渣的粘度会通过减少CaO的含量而增加，因此，应通过考虑熔融炉渣的理化性质来仔细地提出最佳实践的操作窗口。