Reduction of manganese and silicon oxides in smelting of silicomanganese causes significant changes in slag composition and properties: decreasing the ratio of non-bridging oxygens per tetrahedrally coordinated cations (NBO/T), increasing the slag viscosity, and decreasing diffusivities of slag components. These changes can have a strong effect on the kinetics of reduction reactions. This paper analyses effective binary diffusivity of silica and slag viscosity in the process of smelting of silicomanganese from Comilog ore. Compositions of slag and metal phases and slag viscosity were calculated using FACTSage V.7.2 at 1723 K to 1873 K (1450 °C to 1600 °C). Silica effective binary diffusivity and slag viscosity were related to the NBO/T ratio which decreased in the process of MnO and SiO2 reduction from 3.18 (molten charge) to 0.97 at 1723 K (1450 °C), 0.486 at 1773 K (1500 °C), and 0.38 at 1823 K to 1873 K (1550 °C to 1600 °C). Changes in the slag composition and NBO/T ratio caused increase in the slag viscosity and decrease in the effective binary diffusivity of silica by more than an order in magnitude.

中文翻译：

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MnO和SiO2还原过程中二氧化硅有效二元扩散率和硅锰渣粘度的变化

硅锰冶炼过程中锰和氧化硅的减少会导致炉渣成分和性质发生显着变化：降低非桥氧/四面体配位阳离子的比率 (NBO/T)，增加炉渣粘度，降低炉渣组分的扩散率。这些变化会对还原反应的动力学产生很大的影响。分析了Comilog矿冶炼硅锰过程中二氧化硅的有效二元扩散系数和炉渣粘度。在 1723 K 至 1873 K（1450 °C 至 1600 °C）下，使用 FACTSage V.7.2 计算炉渣和金属相的组成以及炉渣粘度。二氧化硅有效二元扩散率和炉渣粘度与 NBO/T 比值有关，NBO/T 比值在 MnO 和 SiO2 还原过程中从 3.18（熔体装料）降低到 0。在 1723 K (1450 °C) 下为 97，在 1773 K (1500 °C) 下为 0.486，在 1823 K 至 1873 K（1550 °C 至 1600 °C）下为 0.38。炉渣成分和 NBO/T 比的变化导致炉渣粘度增加和二氧化硅的有效二元扩散率降低一个数量级以上。