Effects of basicity and MgO content on the viscosity of the SiO2-CaO-MgO-9wt%Al2O3 slag system

• Published in: International journal of minerals, metallurgy and materials Vol. 21; no. 4; pp. 353 - 362
• Main Authors: Gao, Yun-ming, Wang, Shao-bo, Hong, Chuan, Ma, Xiu-juan, Yang, Fu
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01.04.2014; Springer Nature B.V; Key Laboratory for Ferrous Metal urgy and Resources Utilization of the Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
• Subjects: Al2O3; Aluminum oxide; Basic oxides; Basicity; Calcium oxide; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Corrosion and Coatings; Depolymerization; Fourier transforms; Glass; High temperature; Low temperature; Magnesium oxide; Materials Science; Metallic Materials; MgO含量; Natural Materials; Rotating cylinders; Silicon dioxide; Slag; Surfaces and Interfaces; Thin Films; Tribology; Viscosity; Viscous flow; 二氧化硅; 氧化钙; 氧化镁; 炉渣结构; 碱度; 粘度; activation energy; viscosity; Fourier transform infrared spectroscopy; slags; basicity; magnesia
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-014-0916-7

The effects of basicity and MgO content on the viscosity of SiO2-CaO-MgO-9wt%Al2O3 slags with basicity from 0.4 to 1.0 and MgO content from 13wt%to 19wt%were investigated using the rotating cylinder method. A correlation between the viscosity and the slag structure was determined by Fourier transform infrared （FTIR） spectroscopy. It is indicated that the complex network structure of the slag melt is depolymerized into simpler network units with increasing basicity or MgO content, resulting in a continuous decrease in viscosity of the slag. The viscosity is strongly dependent on the combined action of basic oxide components in the slag. Under the present experimental conditions, increasing the basicity is found to be more effective than increasing the MgO content in decreasing the viscosity of the slag. At higher temperatures, the increase of basicity or MgO content does not appreciably decrease the viscosity of the slag, as it does at lower tem-peratures. The calculated activation energy of viscous flow is between 154 and 200 kJ＆#183;mol-1, which decreases with an increase in basicity from 0.4 to 1.0 at a fixed MgO content in the range of 13wt%to 19wt%.