“FeO”, MgO and SiO₂ are the major components of the nickel laterite smelting slags. Significant amounts of Al₂O₃ and “Cr₂O₃” may be present in the slag that come from laterite, coal ash and refractory. Effects of Al₂O₃ and “Cr₂O₃” on liquidus temperatures and solid solutions have been determined in the olivine and spinel primary phase fields in equilibrium with metallic iron. The results are presented in the form of MgO−‘‘FeO’’−SiO₂ pseudo-ternary section at fixed 7 wt% Al₂O₃ and 2 wt% “Cr₂O₃”. A series of pseudo-binary phase diagrams have been constructed to demonstrate the application of phase diagram on smelting reduction of laterite. The liquidus temperatures and the compositions of solid solutions are compared between experimental data and FactSage thermodynamic modelling. The possible reasons for the different results have been discussed which will help FactSage to optimize the relevant databases.

“FeO”、MgO和SiO ₂是红土镍冶炼渣的主要成分。来自红土、煤灰和耐火材料的炉渣中可能存在大量的Al ₂ O ₃和“Cr ₂ O ₃ ”。Al ₂ O ₃和“Cr ₂ O ₃ ”对液相线温度和固溶体的影响已经在与金属铁平衡的橄榄石和尖晶石主相场中确定。结果列于MgO的形式呈现- “”的FeO“” -的SiO ₂伪三元部以固定的7重量％的Al ₂ ö ₃和2％（重量）“的Cr ₂ ö₃ ”。构建了一系列伪二元相图来论证相图在红土冶炼还原中的应用。液相线温度和固溶体组成在实验数据和 FactSage 热力学模型之间进行了比较。已经讨论了不同结果的可能原因，这将有助于 FactSage 优化相关数据库。