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采用二次正交组合设计法,对以高炉渣为主料的不同碱性中间包覆盖剂的黏度进行了测试研究,得出CaF2及碱度变化对覆盖剂黏度的影响规律及程度,得到回归方程,采用XRD和TG-DSC热分析法对熔融覆盖剂的矿物相进行分析,研究黏度变化机理,优化配方。结果表明:覆盖剂的黏度随CaF2含量的增加呈现先增大后减小趋势;随碱度的增大而逐渐增大。XRD图谱和TG-DSC曲线表明:碱度由1.75增大到1.95时,熔融覆盖剂低熔点的黄长石区域等进入较高的尖晶石区域,生成物由Ca4Al2SiO7F2、Ca3(Mg2Si2O4)、CaAlO4等高熔点化合物,向Ca4Al2SiO7F2、(Mg,Fe)2SiO4、CaMgSi2O4等低熔点化合物转变,流动性逐渐加强。
The quadratic orthogonal design method was used to study the viscosity of different alkaline tundish covering agent based on blast furnace slag. The influence law and extent of the change of CaF2 and alkalinity on the viscosity of the covering agent were obtained, and the regression was obtained The XRD and TG-DSC thermal analysis methods were used to analyze the mineralogical phase of the molten coating agent. The mechanism of viscosity variation was studied and the formulation was optimized. The results showed that the viscosity of the coating agent increased first and then decreased with the increase of CaF2 content, and gradually increased with the increase of basicity. XRD patterns and TG-DSC curves show that when the basicity is increased from 1.75 to 1.95, the low melting point of the feldspar zone of the molten coating agent enters the higher spinel zone and the product is composed of Ca4Al2SiO7F2, Ca3 (Mg2Si2O4) and CaAlO4 Melting point compounds, to Ca4Al2SiO7F2, (Mg, Fe) 2SiO4, CaMgSi2O4 and other low melting point compounds, liquidity gradually strengthened.