Effect of MgO/CaO ratio on viscosity and phase structure of chromium-containing high-titanium blast furnace slag

IF 1.6 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Isij International Pub Date : 2024-08-09 DOI:10.2355/isijinternational.isijint-2024-148

Jiawen Chen, Weichao Zheng, Liangbin Chen, Ying Deng, Jiachang Hao, Zhenyun Tian, Guibao Qiu

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Abstract

The effect of MgO/CaO ratio on the viscosity and free running temperature of chromium-containing high-titanium blast furnace slag (CaO-SiO₂-Al₂O₃-MgO-TiO₂-Cr₂O₃) was investigated by a rotating crucible viscometer. When the ternary basicity with a fixed (CaO+MgO)/SiO₂ ratio of 1.41 and the temperature was fixed, the MgO/CaO ratio had an obvious influence on the viscosity of slags. Increasing MgO/CaO ratio from 0.34 to 0.44 caused a slight decrease in the viscosity of the slag, and had an opposite effect when MgO/CaO ratio was more than 0.44. The XRD measurements showed that the technology of ‘‘replacing CaO with MgO'' has an effect on the precipitation temperature of perovskite phase and spinel phase. Accroding to the Raman spectroscopy results, with the increase of MgO/CaO ratio from 0.34 to 0.44, the DOP decreased, and then increased as the MgO/CaO ratio increased from 0.44 to 0.56.

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氧化镁/氧化钙比例对含铬高钛高炉渣粘度和相结构的影响

通过旋转坩埚粘度计研究了 MgO/CaO 比对含铬高钛高炉渣（CaO-SiO2-Al2O3-MgO-TiO2-Cr2O3）粘度和自由流动温度的影响。当三元碱度（CaO+MgO）/SiO2 比为 1.41 且温度固定时，MgO/CaO 比对炉渣粘度有明显影响。将 MgO/CaO 比从 0.34 提高到 0.44 会使炉渣粘度略有下降，而当 MgO/CaO 比大于 0.44 时，则会产生相反的效果。XRD 测量结果表明，"用 MgO 替代 CaO "技术对包晶相和尖晶石相的析出温度有影响。根据拉曼光谱结果，随着氧化镁/氧化钙比率从 0.34 增加到 0.44，DOP 下降，然后随着氧化镁/氧化钙比率从 0.44 增加到 0.56，DOP 上升。

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来源期刊

Isij International 工程技术-冶金工程

CiteScore

3.40

自引率

16.70%

发文量

268

审稿时长

2.6 months

期刊介绍： The journal provides an international medium for the publication of fundamental and technological aspects of the properties, structure, characterization and modeling, processing, fabrication, and environmental issues of iron and steel, along with related engineering materials.