Herein the phase equilibria in the Si–Fe–Ca–O–S–Cu system in equilibrium with matte at controlled P(SO₂) of 0.3 and 0.6 atm and fixed matte grade of 72 wt % Cu were experimentally investigated in the spinel primary phase field. The high-temperature equilibrations were realized in spinel substrate and the sample after quenching were characterized using Electron Probe Micro-analysis (EPMA). The effect of CaO on the liquidus temperature of slags was quantified with varying CaO content from 0 to 6 wt %. It was found that, the presence of CaO increased the liquidus temperature of slags and moreover, the increment effect got enhanced with increasing CaO content in the present range. The influence of P(SO₂) was further clarified and it was found that, the equilibrium SiO₂ content in the liquid phase, at the same temperature, remarkably increased with increasing P(SO₂). The present study will not only deepen the understanding of the equilibration in the present liquid/spinel/matte/gas system, but also provide useful guidance for the industrial operations.

在此，我们在尖晶石初级实验研究了Si–Fe–Ca–O–S–Cu系统中平衡态下的相平衡，其中在受控P（SO ₂）为0.3和0.6 atm的条件下哑光和固定的哑光品位为72 wt％Cu。相场。在尖晶石基板上实现了高温平衡，并使用电子探针显微分析（EPMA）对淬火后的样品进行了表征。通过改变CaO含量从0到6 wt％来量化CaO对炉渣液相温度的影响。发现在此范围内，CaO的存在增加了炉渣的液相线温度，并且随着CaO含量的增加，增量效果得到增强。进一步阐明了P（SO ₂）的影响，发现了平衡SiO ₂在相同温度下，液相中的P含量随P（SO ₂）的增加而显着增加。本研究不仅将加深对当前液体/尖晶石/雾面/气体系统中平衡的理解，而且还将为工业操作提供有用的指导。