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Roles of MgO and Al2O3 in Viscous and Structural Behavior of Blast Furnace Primary Slag with C/S = 1.4
Metallurgical and Materials Transactions B ( IF 3 ) Pub Date : 2020-10-13 , DOI: 10.1007/s11663-020-01980-z
Tingle Li , Chenguang Zhao , Changyu Sun , Sunny Song , Qi Wang

Permeability is crucial for stable operation and strengthening of smelting in blast furnace ironmaking, especially for the current utilization of low-grade iron ore. The viscosity of the primary slag is an important factor affecting permeability. In this study, the roles of MgO and Al2O3 in the viscous and structural behavior of CaO-MgO-Al2O3-SiO2-10 mass pct FeO (CaO/SiO2 weight ratio of 1.4) primary slag were investigated. The results showed that slag viscosity initially decreased and subsequently increased when Al2O3 content was increased from 6 to 16 mass pct, having the lowest value at 10 mass pct Al2O3. The reduction in viscosity with increase in Al2O3 content from 6 to 10 mass pct was attributed to the effect of solid crystals dissolving into the liquid phase caused by the decrease in the liquidus temperature, while the increase in viscosity at higher Al2O3 contents up to 16 mass pct was caused by the network-forming role of Al2O3 owing to its acidic nature. The viscosity fluctuated with increase in MgO content from 6 to 16 mass pct, which was related to the variation in the equilibrated primary phase field. The MgO and Al2O3 in the molten slag network structure functioned as network modifier and network former, respectively, to change the silicate network, as verified by Fourier transform infrared (FTIR) and Raman spectroscopy.

中文翻译:

MgO 和 Al2O3 在 C/S = 1.4 的高炉初渣的粘性和结构行为中的作用

渗透性对于高炉炼铁稳定运行和强化冶炼至关重要,特别是对于目前低品位铁矿石的利用。初渣的粘度是影响渗透率的重要因素。在这项研究中,研究了 MgO 和 Al2O3 在 CaO-MgO-Al2O3-SiO2-10 质量 pct FeO(CaO/SiO2 重量比为 1.4)初渣的粘性和结构行为中的作用。结果表明,当 Al2O3 含量从 6 质量 pct 增加到 16 质量 pct 时,炉渣粘度最初降低,随后增加,在 10 质量 pct Al2O3 时具有最低值。随着 Al2O3 含量从 6 质量 pct 增加到 10 质量 pct,粘度降低归因于液相线温度降低引起的固体晶体溶解到液相中的影响,而当 Al2O3 含量高达 16% 时,粘度增加是由 Al2O3 的酸性网络形成作用引起的。粘度随 MgO 含量从 6 质量 pct 增加到 16 质量 pct 而波动,这与平衡主相场的变化有关。熔渣网络结构中的 MgO 和 Al2O3 分别充当网络改性剂和网络形成剂,以改变硅酸盐网络,如傅里叶变换红外 (FTIR) 和拉曼光谱证实。
更新日期:2020-10-13
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