Regular Article

Effect of B₂O₃ on the structure and properties of aluminate slag

¹ School of Metallurgical Engineering, Anhui University of Technology, Anhui, Ma’anshan, 243032, PR China
² Key Laboratory of Metallurgical Emission Reduction & Resource Recycling (Ministry of Education), Anhui University of Technology, Anhui, Ma’anshan, 243002, PR China

^* e-mail: wuting@ahut.edu.cn,
^** e-mail: which@ahut.edu.cn,

Received: 3 April 2022
Accepted: 20 May 2022

Abstract

The spectral experiment, hemispherical melting point apparatus, rotating cylinder method, and four-probe method are conducted to measure the structure, melting temperature, apparent viscosity and electrical conductivity of aluminate slag. The results show that in order to reduce the comprehensive effect of capacitance and inductance, the frequency of value 6000 Hz corresponding to the minimum impedance is most suitable for the electrical conductivity measurement. Higher B₂O₃ content leads to a lower degree of polymerization, symmetry, and uniformity in the complex three-dimensional structure of the slag, meanwhile the slag hemispheric temperature declines gradually, which enhances the slag superheat, hence decreases the apparent viscosity and increases the electrical conductivity comprehensively, as well as the relation between viscosity logarithm and the conductivity logarithm at 1300 °C was linear. The breaking temperature of apparent viscosity-temperature curve reduces gradually with B₂O₃ addition, while the conductivity-temperature curve indicate that the slag crystallized at about 1210 to 1224 °C, and with the lower B₂O₃ content, the crystallization trend is more obvious.