Influence of Al2O3/SiO2 Ratio on Viscosities of CaO^|^ndash;Al2O3^|^ndash;SiO2 Melt

Zhang, Guohua; Chou, Kuo‐Chih

doi:10.2355/isijinternational.53.177

Cited by 32 publications

(17 citation statements)

References 13 publications

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“…Therefore, viscosities decrease from CAS-1 to CAS-2, CAS-3 to CAS-4. In our previous paper [31], it is also found from experiments that in C a0-A l20 3-S i0 2 melt, viscosity first increases and then decreases as gradually replacing S i0 2 by A120 3, which agrees with the conclusion o f the present study. Figure 8 shows that viscosity always decreases in M g0-A l20 3-S i0 2 system when substituting A120 3 for S i0 2 regardless o f x fco < x ai!o1 or xmec ■> xai,o , .…”

Section: Different Influences Of Ai20 3 and S I02 On Viscositysupporting

confidence: 93%

Influences of different components on viscosities of CaO-MgO-Al2O3-SiO2 melts

Zhang

Chou

2014

J min metall B Metall

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The present study is aim ed to distinguish the different influences o f CaO and MgO, as w ell as A 1,03 and SiO , on viscosity o f C a O -M gO -A ip.-SiO . melts. It is fo u n d that fo r melt without A l,0 3, viscosity increases m onotonously as CaO is gradually replaced by MgO. The addition o f A 1,03 leads to a complex variation o f viscosity. In different composition ranges, viscosity may exhibit different variation tendencies as changing the relative contents o f CaO and MgO while keeping contents o f other components constant. It is also fo u n d that when replacing SiO , by equivalent mole o f A l,0 3, (i) in CaO-A 1,0,-SiO, system, viscosity increases when A l,0 } content is sm all relative to CaO content (there are enough Car' ions to charge compensate A T 4 ions), but decreases when CaO content is inadequate fo r charge compensation; (ii) in MgO-Al,OsSiO , system, viscosity always decreases as substituting A l,0 3fo r SiO,. The reason fo r this difference fo r two systems may be resulted from the weak charge compensation ability o f Mg1 2* ion fo r Al3' ion relative to Ca2* ion. A ll the viscosity variations can be interpreted well by our new proposed viscosity model. Keywords: Viscosity; C aO -M gO -A l,03-S iO B r id g in g oxygen; Non-bridging oxygen

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Section: Different Influences Of Ai20 3 and S I02 On Viscositysupporting

confidence: 93%

Influences of different components on viscosities of CaO-MgO-Al2O3-SiO2 melts

Zhang

Chou

2014

J min metall B Metall

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“…The schematic diagram of the experimental apparatus can be found in our previous paper. 1,2) The viscometer was calibrated by using castor oil at room temperature. During the viscosity measurement, both the crucible and the spindle should be properly aligned along the axis of the viscometer, which is very important because a slight deviation from the axis can cause large experimental errors.…”

Section: Methodsmentioning

confidence: 99%

“…It is closely related to the mass transfer velocity in the slag which determines the reaction kinetics, as well as the effectively separation of slag and metal, etc. Lots of experimental 1,2) and theoretical studies [3][4][5] have been done to investigate the viscosity variation regularity of fully liquid slags. However, in many pyrometallurgical processes, there are always suspension systems composed of liquid slags and insoluble solid particles, for instance, liquid blast furnace slag containing TiC solid particle during the smelting of titanium bearing ore; convert slags containing CaO and 2CaO·SiO 2 solid particles; copper slags containing solid magnetite (Fe 3 O 4 ) during the copper smelting if the atmosphere becomes too oxidized at the operating temperature.…”

Section: Introductionmentioning

confidence: 99%

Influence of TiC on the Viscosity of CaO–MgO–Al2O3–SiO2–TiC Suspension System

2015

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The present study investigated the influence of TiC particle addition on the viscosity of CaO-MgOAl2O3-SiO2 melts by using the rotating cylinder method. It was found viscosity increased as increasing the volume fraction of TiC, but decreased as enhancing the rotation speed. The temperature dependence of viscosity for the same composition can be described by the Arrhenius law. However, temperature has little influence on the relative viscosity of TiC bearing slag. There is also no obvious difference of activation energies for different compositions with or without the addition of TiC solid particle. Therefore, the activation energy of solid-liquid mixture may be mainly determined by the composition of liquid phase. Two kinds of TiC with the particle sizes of 1.0 μm and 10 μm were used to study the influences of solid size on viscosity, and it was found the TiC particle with a small size can increase the viscosity much more greatly. The Einstein-Roscoe equation cannot be used directly to the TiC containing two-phase mixtures. By modifying the parameter, it can well describe the viscosity variation behavior. According to the calculated results, the maximum volume fraction increases as increasing the rotation speed or decreasing the particle size of TiC. The apparent volume of TiC is about 2.2-3.3 times of its real volume.

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“…However, according to the structural analysis here, the amphoteric effect of Al 2 O 3 always existed, although sometimes it was not directly reflected. Looking at this from a different viewpoint, it is shown in Table II that in several Al 2 O 3 -bearing slags, [16,32,39,40] the viscosities first increased and then decreased with increasing Al 2 O 3 content. This trend mainly appeared in two cases: with high Al 2 O 3 content and with sufficient network formers such as SiO 2 in the slags.…”

Section: Viscous Flow Of the Molten Slagsmentioning

confidence: 99%

Understanding the Relationship Between Structure and Thermophysical Properties of CaO-SiO2-MgO-Al2O3 Molten Slags

Sun

Wang

Zhang

2018

Metall Mater Trans B

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In the present work, the relationship between the microscopic structure and macroscopic thermophysical properties in a basic CaO-SiO 2-MgO-Al 2 O 3 quaternary system was identified using Fourier transformation infrared, Raman and 27 Al magic angular spinning nuclear magnetic resonance (MAS-NMR) techniques. The Raman spectra quantitatively proved that with increasing Al 2 O 3 content, the concentrations of the symmetric units of Q 0 (Si) and Q 2 (Si) decreased, while those of the asymmetric units of Q 1 (Si) and Q 3 (Si) increased; consequently, the degree of polymerization of the networks increased, which resulted in an increase in slag viscosity. The 27 Al MAS-NMR spectra demonstrated that three structural units of Al atoms, namely, AlO 4 , AlO 5 , and AlO 6 , mainly existed in the networks. With increasing Al 2 O 3 content, the concentration of AlO 4 slightly decreased, while those of AlO 5 and AlO 6 increased; overall, Al 2 O 3 acted as a network former in the present system. The increasing Al 2 O 3 content led to additional AlO 6 and Si-NBO-Ca-NBO-Al frameworks, which replaced Si-NBO-Ca-NBO-Si in the networks (NBO: non-bridging oxygen) and induced a change in the primarily precipitated crystalline phase from Ca 2 MgSi 2 O 7 and Ca 2 Al 2 SiO 7 to MgAlO 4 .

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Influence of Al2O3/SiO2 Ratio on Viscosities of CaO^|^ndash;Al2O3^|^ndash;SiO2 Melt

Cited by 32 publications

References 13 publications

Influences of different components on viscosities of CaO-MgO-Al2O3-SiO2 melts

Influences of different components on viscosities of CaO-MgO-Al2O3-SiO2 melts

Influence of TiC on the Viscosity of CaO–MgO–Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–TiC Suspension System

Understanding the Relationship Between Structure and Thermophysical Properties of CaO-SiO2-MgO-Al2O3 Molten Slags

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