KR脱硫反应过程中使用纯石灰脱硫剂会生成高熔点硅酸钙覆盖在 CaO 颗粒表面阻碍脱硫反应进行,以往采用加萤石方法生成低熔点的共晶化合物来解决该问题,但会侵蚀炉衬,且污染环境.使用铝渣后,Al可以和 CaO 中被置换出的 O 结合生成 Al2 O3,促进脱硫反应进行,并且可以减少高熔点硅酸钙的生成量.利用工业试验研究加入铝渣对铁水脱硫反应的影响,并利用热力学计算阐述其作用机理.结果表明：加入铝渣后,脱硫反应开始阶段生成 Al2 O3和 CaS,随着反应深入,生成的 Al2 O3与 CaO 结合生成钙铝酸盐,反应产物按照“Al2 O3→CA6(CaAl12 O19)→CA2(CaAl4 O7)→CA(CaAl2 O4)→C3 A(Ca3 Al2 O6)”路径依次生成转变.铝渣中的金属铝可以降低铁水氧势,促进脱硫反应进行,并且铝渣中的 Al2 O3会和 CaO 反应生成低熔点的钙铝酸盐.使用铝渣后铁水硫质量分数均值可降至4.6×10－6,硫质量分数低于10×10－6的比例提升至81.9％.
During KR desulphurization process,desulphurization reaction will be suppressed for high-melting-point silicate covering the surface of CaO.Fluorite was usually used with lime for generating low-melting-point prod-ucts;however,it leads to lining corrosion and environmental pollution.After applying aluminous slag,Al could be combined with the oxygen replaced from CaO forming Al2 O3 to boost desulphurization reaction.Industrial trials were performed to test the desulphurization effect of aluminous slag,and the thermodynamical calculation was also used to illustrate the reaction mechanism.After adding aluminous slag,Al2 O3 and CaS will be formed at first, then aluminate will be formed by the combination of Al2 O3 and CaO,and transforming route of the reaction prod-ucts is “Al2 O3→CA6 (CaAl12 O19 )→CA2 (CaAl4 O7 )→CA(CaAl2 O4 )→C3 A(Ca3 Al2 O6 )”.Aluminum will reduce the oxygen content in hot metal,so the desulphurization process is promoted.The sulphur content could be de-creased to 4.6×10-6 and the ratio of sulfur content below 10×10-6 was increased to 81.9%.
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