Modelling Viscosities of CaO–MgO–Al2O3–SiO2 Molten Slags

Zhang, Guohua; Chou, Kuo‐Chih; Mills, K C

doi:10.2355/isijinternational.52.355

Cited by 105 publications

(71 citation statements)

References 38 publications

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“…Therefore, viscosity increases with increasing content of K 2 O. The viscosity model developed in our previous papers [3][4][5][6] will be used to estimate the viscosity of the compositions studied in this work and compare with the measured values. The detailed descriptions of the model can be found in the early publication, and only a brief introduction about the application to CaO-SiO 2 -Al 2 O 3 -K 2 O system will be given.…”

Section: B Effect Of K 2 O On Viscositymentioning

confidence: 99%

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Measuring and Modeling Viscosity of CaO-Al2O3-SiO2(-K2O) Melt

Zhang

Chou

2012

Metall Mater Trans B

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The effect of K 2 O on viscosity in CaO-SiO 2 -Al 2 O 3 melt has been measured by a rotating spindle viscometer. It is indicated from the experimental results that viscosity first increases then decreases with the increasing content of K 2 O; the maximum viscosity occurs in the field of K 2 O/ Al 2 O 3 > 1. After gradually adding K 2 O, the transformation of bridging oxygen (from being bonded with Al 3+ ion charge compensated by Ca 2+ ion to that compensated by K + ion, for the higher priority of K + ion relative to Ca 2+ ion) increases the viscosity, whereas the increase of content of nonbridging oxygen decreases viscosity. The two factors lead to the complicate variation behavior of viscosity. The viscosity model proposed in our previous papers describes this phenomenon well.

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Section: B Effect Of K 2 O On Viscositymentioning

confidence: 99%

“…Furthermore, the measured viscosity data are compared with the estimated values calculated by the viscosity model proposed in our previous paper. [3][4][5][6] …”

Section: Introductionmentioning

confidence: 99%

Measuring and Modeling Viscosity of CaO-Al2O3-SiO2(-K2O) Melt

Zhang

Chou

2012

Metall Mater Trans B

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“…The viscosity and the TiO 2 content of the slag are high in the blast furnace (BF) iron-making process, due to the high TiO 2 content in the CCVTM. The slag experiences a decreased ability for desulfurization, and it is difficult to separate the slag from the iron [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effects of Dolomite on Mineral Compositions and Metallurgical Properties of Chromium-Bearing Vanadium–Titanium Magnetite Sinter

et al. 2017

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Abstract:Chengde chromium-bearing vanadium-titanium magnetite (CCVTM) has been used as an important mineral resource in sinter making. The MgO content of this sinter can be enhanced by adding dolomite, which improved operation of the blast furnace. The effects of MgO in the form of dolomite on metallurgical properties, microstructure and mineral compositions of CCVTM sinter were studied by a sinter pot test, X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), and mineral phase microanalysis. The results were as follows: The flame front speed and sinter coefficient decreased with an increase in MgO content from 2.66 to 3.86% by adding dolomite. With an increase in MgO content from 2.66 to 3.86%, the flame front speed, sintering utilization factor, and the value of RI decreased, while RDI and the softening-melting properties improved. In addition, the value of sinter strength (TI) reached a maximum value at MgO = 3.56%. In addition, an increase in the abundance of magnetite, magnesium ferrite, and silicate phase, as well as a decrease in hematite, was found with an increase in MgO content. We concluded that the most appropriate MgO content in the sinter is 3.56%.

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“…There are three kinds of oxygen ions in the molten slag: bridging oxygen, non-bridging oxygen and free oxygen. 12) Both the bridging oxygen and non-bridging oxygen are bonded with the network forming cation such as Si ion, so their mobile abilities are weak under electric field. While the free oxygen ion is only bonded with cation from basic oxide, thereby, a larger diffusion rate could be anticipated.…”

Section: Discussionmentioning

confidence: 99%

Deoxidation of Liquid Steel with Molten Slag by Using Electrochemical Method

Zhang

Chou

2014

ISIJ Int.

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A new unpolluted deoxidation method for liquid steel was given in this paper. Four deoxidation experiments were done, under the conditions of applied voltage U=0, 2 V, 4 V and 6 V between the liquid steel and CaO(45 wt%)-Al2O3(55 wt%) molten slag. The results showed that the deoxidation rate increased as increasing of applied voltage. In addition, based on the oxygen diffusion behavior under the gradient of electrochemical potential, the kinetics formulae for deoxidation of steel with molten slag electrochemistry method are derived. The formulae can well describe the change of dissolved oxygen content in the steel. From the formulae it can be concluded that deoxidation rate could be enhanced by strengthening the stirring of steel, increasing the applied voltage, and selecting slag system with a high basicity and a low viscosity, etc.

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Modelling Viscosities of CaO–MgO–Al2O3–SiO2 Molten Slags

Cited by 105 publications

References 38 publications

Measuring and Modeling Viscosity of CaO-Al2O3-SiO2(-K2O) Melt

Measuring and Modeling Viscosity of CaO-Al2O3-SiO2(-K2O) Melt

Effects of Dolomite on Mineral Compositions and Metallurgical Properties of Chromium-Bearing Vanadium–Titanium Magnetite Sinter

Deoxidation of Liquid Steel with Molten Slag by Using Electrochemical Method

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