(1. Sheet Metal Research Institute, Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100043,China; 2. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology, Beijing 100043, China)
Abstract:In order to achieve precise control of viscosities of chromium containing slags in ferrochrome process,the effects of varing basicities (the ratio of CaO to SiO2) and Cr2O3 mass percent on the viscosities of the ferrochrome slags in microstructure level were investigated,and the Iida viscosity model was optimized. The viscosities of CaO-SiO2-MgO-Al2O3-Cr2O3 slags were measured by rotating cylinder method,and the structures of the slags were examined via Raman spectroscopy to explicate the effects of basicities and Cr2O3 mass percent on viscosities. The results show that the viscosities and the BO values of the slags both increase as the Cr2O3 mass percent increase,but decrease as basicities increase. The viscosities of slags have similar changing tendency with DOP. The Iida viscosity model is further optimized with the measured data. The estimated values by modified Iida model are in good consistence with measured ones,which indicate the viscosities of Cr2O3 containing slags can be properly predicted in a large temperature and composition ranges.
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