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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Al_2O_3,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Al_2O_3和CaS,随着反应深入,生成的Al_2O_3与CaO结合生成钙铝酸盐,反应产物按照“Al_2O_3→CA6(CaAl_(12)O_(19))→CA_2(CaAl_4O_7)→CA(CaAl_2O_4)→C_3A(Ca_3Al_2O_6)”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Al_2O_3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%。
KR Desulfurization reaction process using pure lime desulfurization agent will generate high-melting calcium silicate coated on the surface of CaO particles obstruct the desulfurization reaction in the past using fluorite method to generate low-melting eutectic compounds to solve the problem, but will erode the lining, And pollute the environment. After using aluminum slag, Al can combine with O replaced by CaO to form Al 2 O 3 to promote the desulfurization reaction and reduce the amount of high-melting calcium silicate. The industrial experiment was conducted to study the influence of adding aluminum slag on the hot metal desulphurization reaction and the thermodynamic calculation was used to explain its mechanism. The results show that Al 2 O 3 and CaS are formed in the initial stage of the desulfurization reaction after the addition of aluminum slag. With the further reaction, the formed Al 2 O 3 and CaO combine to form the calcium aluminate. The reaction products are in the order of “Al 2 O 3 → CA 6 (CaAl 12 O 19 ) → CA_2 (CaAl_4O_7) → CA (CaAl_2O_4) → C_3A (Ca_3Al_2O_6) ”path. The aluminum in the aluminum slag can reduce the oxygen potential of the molten iron and promote the desulfurization reaction, and the Al_2O_3 in the aluminum slag can react with CaO to form the low-melting calcium aluminate. After using aluminum slag, the average content of sulfur in molten iron can be reduced to 4.6 × 10 -6, and the proportion of sulfur content below 10 × 10 -6 increased to 81.9%.