Structure–property relationship amphoteric oxide systems via phase stability and ionic structural analysis

Abstract

Understanding the correlation between material deterioration and quality is required to control the slag composition with increasing gangue components (Al 2 O 3 /SiO 2) 1-3 and impurity elements (S and P). According to recent studies, 1,3,4 the flexibility of slag usage can be secured using the structure-property relationships of slag containing moderate CaO contents and amphoteric oxides such as Fe t O and Al 2 O 3. Detailed observations of the ionic structure of slags aid the fundamental understanding of the physical and chemical properties of slags. Understanding the structure-property relationship enables the prediction of properties via the slag-property model with strong reliability. 1,3,4 Mysen and Richet 5 reviewed the relationship between the ionic structure and the properties of silicate for geological magma or glass, and Keene and Mills 6 summarized the physical properties of BOS slags. Recently, the relationships between various physical properties of slag, such as the viscosity, heat capacity, conductivity, surface tension, and foaming index, with the ionic structure of slags have been reviewed. 1

Effect of Ce₂O₃ on the Melt Structure and Properties of CaO–Al₂O₃-based Slag

“…46) Recent studies showed that the activation energy was related to the polymeric unit (T-O-T, T = Si, Al, etc.). 47) With increasing Ce 2 O 3 addition from 5 wt% to 20 wt%, the apparent activation energy decreased from 168.44 ± 6.11 kJ•mol − 1 to 79.18 ± 2.59 kJ•mol − 1 , which indicated that the liquid shearing resistance of the slag reduced by the addition of Ce 2 O 3 content.…”

Influence of Al2O3 Content and Cooling Rate on Crystallization in Fe2O3–CaO–SiO2–Al2O3 Systems

“…For example, the 10 wt% Al 2 O 3 sample did not adopt an acicular structure even at a cooling rate of 500 K/ min. This phase change is due to the rapid increase in the melt viscosity as the Al 2 O 3 content increases [31].…”

Effect of slag basicity on Turing pattern corrosion of alumina refractory ceramics in the presence of free radicals

“…13 The amphoteric oxide Al 2 O 3 can behave as a network modifier and also a network former, depending on the presence of other strong alkaline or acidic oxides. 14 High Al 2 O 3 content of high alumina slags leads to high viscosity and high melting point, which makes it difficult for the bosh slag to flow up and down in the furnace. 15 However, the structure of the depolymerized slag can be adjusted by adding appropriate MgO.…”

“…The metallurgical properties of the slag are determined by its composition and structure 13 . The amphoteric oxide Al 2 O 3 can behave as a network modifier and also a network former, depending on the presence of other strong alkaline or acidic oxides 14 . High Al 2 O 3 content of high alumina slags leads to high viscosity and high melting point, which makes it difficult for the bosh slag to flow up and down in the furnace 15 .…”