The sulphide capacity of CaO‐SiO2‐Al2O3‐MgO(‐FeO) smelting reduction slags
The sulphide capacity of CaO‐SiO2‐Al2O3‐MgO(‐FeO) smelting reduction slags
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DOI：
10.1002/srin.199905627
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发表时间：
1999-06
期刊：
影响因子：
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通讯作者：
Jeong-Do Seo;Seon-hyo Kim
中科院分区：
文献类型：
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作者：
Jeong-Do Seo;Seon-hyo Kim
MgO和FeO含量对Corex渣的硫化物容量的影响进行了研究，在1773 K使用气/渣平衡技术作为稳定Corex操作条件的基础研究。在一定碱度[B = {（%CaO）+（%MgO）}/（% SiO2）]下，MgO逐渐取代CaO降低了CaO-SiO2-Al 2 O3-MgO渣系的硫容。在CaO-SiO2-Al 2 O3-MgO渣系中加入一定比例的FeO，MgO和Al 2 O3，可显著提高渣系的硫容量。在CaO/SiO2、MgO和FeO含量不变的情况下，随着Al 2 O3含量的增加，硫容量降低。基于先前报道的和当前的硫化物容量值，在1773 K下，硫化物容量作为基于摩尔分数的炉渣组成的函数由以下公式表示：log CS = X CaO - 3.89 X SiO2 - 3.18 X Al 2 O3 - 0.55 X MgO + 2.43 X FeO - 2.61。此外，硫化物容量与光学碱度的关系可用log Cs = 12.51 Λ -12.24表示，并由此得到FeO的理论光学碱度为0.94。根据现有的硫容量值和铁液中的氧活度，估算了FeO对硫分配比的影响。铁液中的氧活度可借助于Fe/FeO平衡确定。渣中FeO活度可用基于正规溶液模型的二次方程描述。硫的分配比根据FeO含量的变化以相反的方式相比，硫化物容量。
The effects of MgO and FeO contents on the sulphide capacity of Corex slags were investigated at 1773 K using gas/slag equilibrium technique as a fundamental study for stabilising Corex operational conditions. The gradual substitution of MgO for CaO at a fixed basicity [B = {(%CaO)+(%MgO)}/(%SiO 2 ) decreased the sulphide capacities of CaO-SiO 2 -Al 2 O 3 -MgO slags. The addition of FeO into the CaO-SiO 2 -Al 2 O 3 -MgO slags at the fixed (%CaO)/(%SiO 2 ) ratio, MgO and Al 2 O 3 contents significantly increased the sulphide capacities. The sulphide capacity decreased according to the increasing Al 2 O 3 content at the fixed (%CaO)/(%SiO 2 ) ratio, MgO and FeO content. Based on the previously reported and present values of sulphide capacities, the sulphide capacity as a function of slag composition on the mole fraction base at 1773 K was expressed by the formula of log C S = X CaO - 3.89 X SiO2 - 3.18 X Al2O3 - 0.55 X MgO + 2.43 X FeO - 2.61. In addition, the relationship between the sulphide capacity and optical basicity could be represented as the formula of log Cs = 12.51 Λ -12.24 and the theoretical optical basicity of FeO was found be 0.94 from the correlation. The effect of FeO on the sulphur distribution ratio was estimated using the present sulphide capacity values and the oxygen activity in liquid iron, which could be determined with the help of Fe/FeO equilibrium. FeO activity in slag was well described by the quadratic formalism based on the regular solution model. The sulphur distribution ratio according to FeO content varies in an opposite way, compared with that of the sulphide capacity.