Effects of MgO, Na₂O, and B₂O₃ on the Viscosity and Structure of Cr₂O₃-bearing CaO–SiO₂–Al₂O₃ Slags

Abstract

slags was greater than that of Na 2 O. This could be due to the different ways in which these additives modify the slag network structure. Raman spectroscopy analysis revealed that MgO and Na 2 O work as network modifiers, and the degree of polymerization (DOP) of slags increases with the addition of MgO and Na 2 O. MgO is more effective at modifying the structure than Na 2 O, because Na 2 O may be more likely to produce network former [AlO 4 ] units. In this study, Cr 2 O 3 and B 2 O 3 are found to behave as network formers and increase the DOP. This is characterized by the decrease in NBO/Si (the number of non-bridging oxygen per Si atom) value. B 2 O 3 addition leads to the formation of low melting point eutectics and weaker polymerization strength, which contribute to the decrease in slag viscosity.

Viscosity and Structure of CaO–SiO2–“FeO”–Al2O3–MgO System during Iron‐Extracting Process from Nickel Slag by Aluminum Dross. Part 1: Coupling Effect of “FeO” and Al2O3

“…The change in viscosity is not merely correlated to the slag components, but also combined with the structure in the melt . According to the studies by Wang and other researchers, the viscosity‐structure relationship is really essential for investigating slag properties in various slag systems. Therefore, the structure of slags No.…”

“…As proposed by Maehara and other researchers, Raman scattering efficiency of Si–O bond depends on the type of Q n species, however, it is difficult for the authors to determine the exact Q n distribution by another experimental technique nuclear magnetic resonance (NMR) to calibrate the Raman area fraction. Based on the studies by Li et al, the relative area fraction of individual unit can be used for quantitative estimation, and the concept of which is adopted in the present work. The relative area fraction of individual unit is obtained by dividing the integrated area of all the structural units.…”

Effect of B2O3 addition on mineralogical phases and leaching behavior of synthetic CaO–SiO2–MgO–Al2O3–CrOx slag

“…2and 3that the viscosity of slag plays a dominant role in coarsening of crystals in slag. Li et al reported that B 2 O 3 addition leads to the formation of low melting point eutectics and weaker polymerization strength, which contribute to the decrease in slag viscosity [33]. Therefore, according to Eqs.…”

Viscosity-structure-crystallization of the Ce₂O₃-bearing Calcium-aluminate-based Melts with Different Contents of B₂O₃

“…Investigation indicated that B 2 O 3 show better fluxing actions on CaO-based slags, 6) and B 2 O 3 addition also led to the formation of low melting point eutectics. 8) Fig. 9.…”

“…B 2 O 3 addition also led to the formation of low melting point eutectics and weaker polymerization strength. 8) In present new-desigened slag system, B 2 O 3 was added not only to decrease the melting temperature, but also to improve the inclusion absorption ability of the slag. According to Wan,9) …”