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通过现场取样分析和热力学计算,评价了工业化生产GCr15轴承钢LF精炼工序的脱硫能力。分析了精炼温度、钢中酸溶铝含量、精炼渣的光学碱度对LF精炼过程硫分配比的影响。由于实际精炼过程中脱硫反应未达到平衡,实际测得的硫分配比低于理论计算值。得到了精炼温度为1 830~1 855K,钢中酸溶铝的质量分数为0.020%~0.050%,精炼渣光学碱度在0.760~0.795范围内,精炼温度、钢中酸溶铝、渣的光学碱度及渣中Al2O3、SiO_2含量对硫分配比影响的回归方程,该方程可作为实际生产条件下LF精炼工序脱硫能力的评价依据。根据回归方程,设计了改变精炼渣组成的3因素4水平正交实验,分析了精炼渣二元碱度R2及Al2O3和SiO_2含量对硫分配比的影响,得出渣-钢间最优硫分配比的精炼渣组成(质量分数)为:CaO 55.11%,Al2O330%,SiO_26.89%,MgO 8%,光学碱度为0.777。
Through on-site sampling analysis and thermodynamic calculation, the desulfurization capacity of industrialized GCr15 bearing steel LF refining process was evaluated. The effects of refining temperature, acid-soluble aluminum content in steel, and optical basicity of refining slag on sulfur distribution ratio in LF refining process were analyzed. Due to the fact that the desulfurization reaction does not reach equilibrium in the actual refining process, the actual measured sulfur distribution ratio is lower than the theoretical calculation value. The results show that the refining temperature is 1 830 ~ 1 855K, the mass fraction of acid-soluble aluminum in steel is 0.020% ~ 0.050%, the optical basicity of refined slag is in the range of 0.760 ~ 0.795, the refining temperature, Alkalinity and residue of Al2O3, SiO2 content of the sulfur distribution ratio of the regression equation, the equation can be used as the actual production conditions LF refining process desulfurization capacity evaluation basis. According to the regression equation, a 3-factor 4-level orthogonal experiment was designed to change the composition of the refining slag. The effects of binary basicity R2, Al2O3 and SiO2 contents on the sulfur distribution ratio were analyzed, and the optimal sulfur distribution The specific composition of the refined slag (mass fraction) is 55.11% of CaO, 30% of Al2O3, 26.89% of SiO2, 8% of MgO and the optical basicity is 0.777.