Structure-based viscosity model development for titania aluminosilicate slags. (7th February 2020)

• Record Type: Journal Article
• Authors: Yan, Zhiming; Reddy, Ramana G.; Lv, Xuewei; Pang, Zhengde; He, Wenchao
• Is Part Of: Ironmaking & steelmaking. Volume 47:Number 2(2020)
• Page Start: 203
• Page End: 209
• Publication Date: 2020-02-07
• Subjects: Titania melts -- viscosity modelling -- melt structure; Iron industry and trade -- Periodicals; Steel industry and trade -- Periodicals; 669.1
• DOI: 10.1080/03019233.2018.1510876
• Languages: English
• ISSNs: 0301-9233

Abstract

ABSTRACT: Based on the structure of melts, a model has been developed that estimates the viscosity of the fully liquid melts in the CaO–MgO–Al2 O3 –SiO2 –TiO2 systems. Three kinds of tetrahedral ([SiO4 ] 4−, [AlO4 ] 5−, and [TiO4 ] 4− ) are considered in the titania aluminosilicate slag. According to the hole theory of melts, this model provides a link between the viscosity and the structures of the melts. The present model is capable of predicting the viscosities in the CaO–MgO-–Al2 O3 –SiO2 –TiO2 systems with wide composition and temperature ranges above liquidus; the average of relative errors for this model was approximately 20.0%. From the model calculation results, the addition of TiO2 decrease the viscosity of slag under non-reducing atmosphere. The ability of increasing viscosity follows the order: SiO2 > Al2 O3 > TiO2 > CaO. Due to the charge compensation and unit size effect, the replacement of TiO2 by Al2 O3 will result in the increase of viscosity.