Abstract In order to improve the recycling efficiency of stainless-steel slag resources, the effect of different cooling rates on the crystallization behavior of CaO-SiO2-MgO-Cr2O3 based system was studied by using FactSage 7.1, XRD, SEM and IPP 6.0. The results indicated that the spinel is a high-temperature precipitated phase and the cooling rate had less effect on the final grain size of spinel crystals, but had greater influences on the nucleation of spinel crystals and the crystallization of silicates such as α-C2S.When the cooling rate was 12∘C/min, the spinel crystals was the unique precipitation. However, the spinel crystals and α-C2S could produce during the slag cooling process as the cooling rate was1∘C/min. Chromium in silicate phase is inclinable to leaching with the dissolution of silicate phase, so the formation of silicate phase should be controlled. According to the influence of the cooling rate on the formation of spinel crystals and the erosion of spinel crystals by α-C2S, it is suggested that the cooling rate of the stainless-steel slag in industrial treatment should not be lower than 12∘C/min.

中文翻译：

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冷却速度对CaO-SiO2-MgO-Cr2O3基渣结晶行为的影响

摘要 为提高不锈钢渣资源的回收利用效率，利用FactSage 7.1、XRD、SEM和IPP 6.0研究了不同冷却速率对CaO-SiO2-MgO-Cr2O3基体系结晶行为的影响。结果表明，尖晶石为高温析出相，冷却速度对尖晶石晶体最终晶粒尺寸的影响较小，但对尖晶石晶体的形核和α-C2S等硅酸盐的结晶影响较大。当冷却速度为12∘C/min时，尖晶石晶体是独特的析出物。然而，当冷却速度为1∘C/min时，在渣冷却过程中会产生尖晶石晶体和α-C2S。硅酸盐相中的铬随着硅酸盐相的溶解而倾向于浸出，因此应控制硅酸盐相的形成。根据冷却速度对尖晶石晶体形成的影响和α-C2S对尖晶石晶体的侵蚀，建议工业处理不锈钢渣的冷却速度不应低于12∘C/分钟