Structural viscosity model for aluminosilicate slags

Abstract

Based on the structure of aluminosilicate slag, a new model has been proposed for viscosity calculation of aluminosilicate slags. Contributions of bridging oxygen (O 0 ), non-bridging oxygen (O 2 ) and free oxygen (O 22 ) to viscous activation energy were modelled. Compositions of three types of oxygen were calculated from optical basicity values by combining the Toop-Samis model with a correlation between reciprocal of optical basicity and polymerisation extent proposed by Ottonello and Moretti. Charge compensation equilibrium among charge compensated Al, cations for modifying network and Al with no charge compensating cations was considered. The model has been applied in calculations of viscosity of the Al 2 O 3 -CaO-MgOSiO 2 system. Good agreement between calculated and measured viscosity with a mean deviation of less than 25% was achieved. Since most viscosity measurements for molten slag at high temperature ware subject to an experimental uncertainty of 25%, the present model could provide accurate viscosity values for slag systems investigated.

Physicochemical properties and structure of titania-containing metallurgical slags: a review

“…The model proposed by Zhang et al [53] described by Arrhenius law and the oxygen ion related to Ti 4+ is assumed to a new type of oxygen. However, the calculation of oxygen fraction relies on assumption and lacks theory support [44,54]. Yan et al has attracted the attention of researchers.…”

A Structurally-based Viscosity Model of the Fully Liquid Slags in the CaO–MgO–Al₂O₃–FeO–SiO₂ System

“…Many models have been reported to estimate the viscosity of molten slags using different ways in the past several decades. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] However, few models could accurately predict high basicity (C/S=w(CaO)/ w(SiO 2 )) slag, and most of them were based on limited experimental data. In addition, the complicated and variable structures of multi-component aluminosilicate melts were the difficulty of model estimation for these kinds of slags.…”

Structure-based viscosity model development for titania aluminosilicate slags

“…Zhang model [22,23] described by the Arrhenius law and the oxygen ion related to Ti 4+ is assumed to a new type of oxygen. However, the calculation of oxygen fraction relies on the assumption and lacks theory support [24,25].…”