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The Interface Characteristics of High-Temperature Melt of CaO-Al2O3-MgO-SiO2 System

Tian Chen, He Zhi-jun, Zhang Jun-hong, Zhao Xing-tong, Pang Qing-hai and Zhan Wen-long

Abstract The interface characteristics were studied, which contained surface tension and interfacial melting of CaO-Al2O3-MgO-SiO2 system in low basicity at high temperature. The CaO-MgO-Al2O3-SiO2 slag system interface model was simulated by Butler equation and Girifalco-Good equation. At the same time, in the CaO-MgO-Al2O3-SiO2 slag, of which the effect of different basicity on the melting behavior and temperature was simulated and calculated. The experimental result indicated that: the surface tension increases with the increase of A12O3 content in the slag system, when the basicity < 2.0. But the effect of the slag system will gradually decrease with the Al2O3 increasing. The increase of the content of magnesium can improve the melting temperature of slag system and decrease the melting range.

Keywords Cao-Al2O3-MgO-SiO2 system High-temperature melt Surface tension Melting process

Introduction

The slag is the complex compound which formed by the oxide as the main body in the metallurgical process. In addition to the metal melt, it is another important product in the process of metallurgy [1]. There are many chemical reactions which are closely related to physical properties of the slag in the process of smelting and casting. The surface tension and interfacial tension of slag are not only important data to studying the interfacial reaction, but also the most important properties of the slag. The surface tension and interfacial tension of slag have important influence on the interfacial reaction, the removal of inclusions and the corrosion of refractory materials [2-4].

T. Chen • H. Zhi-jun • Z. Jun-hong • Z. Xing-tong • P. Qing-hai (H) • Z. Wen-long School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China e-mail: This email address is being protected from spam bots, you need Javascript enabled to view it

© The Minerals, Metals & Materials Society 2017

A. Allanore et al. (eds.), Materials Processing Fundamentals 2017,

The Minerals, Metals & Materials Series, DOI 10.1007/978-3-319-51580-9_10

In the ironmaking process, Blast furnace slag (BF slag) can help reducing metal elements and controlling chemical composition of pig iron. In the smelting, the slag adhered to the blast furnace lining (BF lining) so that the slag could make certain protective effect between the molten iron and the BF lining. In addition, the softening-melting zone and the dropping zone were appeared by the formation of blast furnace slag in blast furnace. The interval and temperature of softening-melting and dropping zone can be controlled effectively by controlling composition and properties of slag in order to control the smelting strength and capacity of blast furnace [5, 6].

In this paper, CaO-SiO2-Al2O3-MgO slag system was simulated and calculated so as to studying the melting behavior and the interface characteristics of inquiry under low basicity CaO-SiO2-Al2O3-MgO slag system. According to these, a theoretical basis for the research on the development of low basicity slag can be provided.

 
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