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Sulfide Capacity of the CaO–SiO2–MnO Slag at 1873 K

机译：CaO-SiO 2 -MnO渣在1873 K时的硫化容量

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摘要

The sulfide capacity of the CaO–SiO_(2)–MnO slag through the entire composition range was measured at 1873 K using a gas–slag equilibration method and the effect of basicity and the activity coefficient of sulfide on the sulfide capacity of molten slag was investigated. Furthermore, the relationship between the sulfide capacity and the optical basicity of MnO–containing slags was evaluated in view of industrial applications. Sulfide capacity of the slag linearly increased by increasing the content of MnO not only at a given silica content but also at a fixed Vee ratio (=CaO/SiO_(2)). The capacity and the modified Vee ratio (=(CaO+MnO)/SiO_(2)) showed a good linear relationship. Assuming that the basicity and the stability of sulfide ion in the slag are proportional to the activity of MnO (a_(MnO)) and the activity coefficient of MnS (γ_(MnS)), respectively, the composition dependency of sulfide capacity was well described by the changes in the ratio of a_(MnO) to γ_(MnS). The iso–sulfide capacity of the CaO–SiO_(2)–MnO slag at 1873 K was constructed in the present study. The capacity contours seemed to rotate clock–wisely from the CaO–SiO_(2) binary side to the MnO–corner. The sulfide capacity increased with increasing ratio of MnO to CaO at relatively acidic region in which silica content greater than about 40 mass%, while the substitution of CaO by MnO does not significantly affect the capacity in the low silica region. The sulfide capacity generally increased with increasing content of MnO regardless of changes in the content of other constituents in multicomponent MnO–containing slags. It is necessary to take different values for the theoretical optical basicity of MnO in order to estimate the sulfide capacity of MnO–containing slags depending on the content of silica.
机译：CaO–SiO_（2）–MnO渣在整个成分范围内的硫化物容量使用气渣平衡法在1873 K下测量，碱度和硫化物活度系数对熔融渣的硫化物容量的影响为调查。此外，从工业应用的角度评估了硫化容量和含MnO的炉渣的光学碱度之间的关系。不仅在给定的二氧化硅含量下，而且在固定的Vee比（= CaO / SiO_（2））下，通过增加MnO的含量，炉渣的硫化容量线性增加。容量和改进的Vee比（=（CaO + MnO）/ SiO_（2））显示出良好的线性关系。假设炉渣中硫化物离子的碱度和稳定性分别与MnO的活性（a_（MnO））和MnS的活性系数（γ_（MnS））成正比，则很好地描述了硫化物容量的成分依赖性通过改变a_（MnO）与γ_（MnS）的比率。在本研究中，构建了1873 K时CaO–SiO_（2）–MnO渣的异硫容量。容量轮廓似乎从CaO-SiO_（2）二元面到MnO-角沿顺时针方向旋转。在二氧化硅含量大于约40质量％的相对酸性区域，硫化物容量随MnO与CaO之比的增加而增加，而用MnO取代CaO不会显着影响低二氧化硅区域的容量。硫化物容量通常随MnO含量的增加而增加，而与含MnO的多组分炉渣中其他成分含量的变化无关。为了根据二氧化硅的含量估算含MnO的炉渣的硫化能力，有必要对MnO的理论光学碱度采用不同的值。

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