摘要
The effect of B_(2)O_(3) content on the viscosity of SiO_(2)−MgO−FeO-based molten slag system was investigated using the rotating cylinder method.The evolution process of the melt structure under different contents of B_(2)O_(3) was comprehensively studied via FTIR spectroscopy and a model for calculating the degree of polymerization was developed.The results showed that the viscosity of the molten slag decreased with the addition of B_(2)O_(3),which had a slight effect when its content exceeded 3 wt.%.As the addition of B_(2)O_(3) increased from 0 to 4 wt.%,the break temperature of the slags decreased from 1152 to 1050℃ and the apparent activation energy decreased from 157.90 to 141.84 kJ/mol.The addition of B_(2)O_(3) to the molten slag destroyed the chain silicate structure to form a more cyclic borosilicate structure.The Urbain model was improved to calculate the viscosity of the SiO_(2)−MgO−FeO-based slags,and the values were in good agreement with the experimentally measured values.
采用转筒法研究B_(2)O_(3)含量对FeO-MgO-SiO_(2)基渣系黏度的影响,利用FTIR分析方法研究不同B_(2)O_(3)含量下渣系结构的变化,并建立聚合度计算模型。结果表明,加入B_(2)O_(3)后熔体的黏度下降。当B_(2)O_(3)含量高于3%(质量分数)时,B_(2)O_(3)对熔体黏度的影响较小;随B_(2)O_(3)添加量由0增加至4%(质量分数),炉渣的熔化温度由1152℃降低至1050℃,表观活化能由157.90 kJ/mol降低至141.84 kJ/mol。在熔融炉渣中加入B_(2)O_(3)破坏链状硅酸盐结构,形成更加环状的硼硅酸盐结构。采用修正的Urbain模型预测SiO_(2)-MgO-FeO基渣系黏度,实验得到的黏度值与新模型计算的黏度值吻合较好。
基金
financially supported by the National Natural Science Foundation of China (No.51774224)。
