AOD氧化期渣对镁钙质炉衬侵蚀的影响

Effect of AOD Oxidizing Slag on Magnesia-Calcia Lining Erosion

利用扫描电镜对镁钙砖反应层进行能谱分析,研究了120t AOD氧化期渣碱度(CaO/SiO_2-1.0～3.1)及渣中TFe(5.0%～20.0%)、MgO(1.7%～12.0%)、Cr_2O_3(8.0%～30.0%)对镁钙质炉衬侵蚀的影响。结果表明,氧化期渣碱度和渣中TFe含量是镁钙质炉衬侵蚀的重要影响因素,增加炉渣碱度(CaO/SiO_2≥3),降低渣中TFe含量(≤15%)可明显减少对炉衬的侵蚀。渣中含4%～12%MgO、15%～30%Cr_2O_3时对炉衬侵蚀的影响较小。

The effect of slag basicity （ CaO/SiO2- 1.0 - 3.1 ）, TFe （5.0% - 20. 0% ）, MgO （ 1.7% - 12. 0% ）, Cr203 （ 8.0% - 30.0% ） in slag on magnesia-calcia lining of an 120 t VOD unit has been studied by using scanning electron microscope analyzing the energy dispersive spectrum of reaction layer of magnesia-calcia brick. Results showed that the slag basicity and TFe content in slag were the important factors for magnesia-calcia lining erosion; with increasing slag basicity （ CaO/SiO2 ≥3） and decreasing TFe content in slag （ ≤ 15% ）, the lining erosion decreased obviously; and as MgO content was 4% - 12%, Cr203 was 15% - 30%, the effect on lining erosion was minor.