The crystalline transition of the silicate Ca₂SiO₄ formed during stainless steel dust carbothermal reduction cooling is the key to the efficient separation of the reduced metal and slag. With stainless steel dust as the raw material and low basicity laterite nickel ore as an additive, the self-pulverization rate, the self-pulverization slag content and the phase transition of the reduced slag for different basicity conditions were studied. Meanwhile, the production and control mechanism of the silicate Ca₂SiO₄ has been elucidated in conjunction with thermodynamic calculations. It was shown that with 6% laterite nickel ore was added to the stainless steel dust, the basicity of the reduced slag system was reduced to 2.1, the self-pulverization rate of the reduced slag reached 90.35% and the self-pulverization slag content reached 88.65%. The dominant phase in the self-pulverization slag system is Ca₂SiO₄, which effectively enhances the silicate Ca₂SiO₄ system of the reduced slag and enables efficient separation of the reduced slag of stainless steel dust from the reduced metal. Non-toxic and harmless high-efficiency reduced slag can be used as a high-quality raw material for ceramics and cement, enabling a comprehensive application and sustainable development of solid waste materials for stainless steel dust.

不锈钢粉尘碳热还原冷却过程中形成的硅酸盐Ca ₂ SiO _{4的晶相转变是还原金属与熔渣高效分离的关键。}以不锈钢粉为原料，低碱度红土镍矿为添加剂，研究了不同碱度条件下还原渣的自磨率、自磨渣含量和还原渣的相变。同时，硅酸盐Ca ₂ SiO _{4的产生及控制机理}已结合热力学计算进行了阐明。结果表明，在不锈钢粉尘中加入6%红土镍矿，还原渣体系碱度降至2.1，还原渣自粉率达到90.35%，自粉渣含量达到88.65%。自磨渣体系中的主相是Ca ₂ SiO ₄，有效提高了硅酸盐Ca ₂ SiO ₄减少炉渣的系统，并能够有效地将不锈钢粉尘的还原炉渣与还原金属分离。无毒无害的高效还原渣可作为陶瓷、水泥的优质原料，实现不锈钢粉尘固废材料的综合应用和可持续发展。