Viscosity of a CaO-MgO-Al2O3-SiO2 melt containing spinel particles at 1646K

Wright, Steven; Zhang, L.; Sun, Shouyi; Jahanshahi, Sharif

doi:10.1007/s11663-000-0134-8

Cited by 104 publications

(96 citation statements)

References 8 publications

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“…In the case of the analysed slag solid elements have a totally different shape and size. These observations are in line with those presented by the authors [9], who drew conclusions concerning the application of Einstein-Roscoe model in determining the dynamic viscosity coefficient of liquid slag systems. Table 4 presents the measurement schemes which were conducted for all samples.…”

Section: Results Analysissupporting

confidence: 91%

See 1 more Smart Citation

Semi-Solid State of Blast Furnace Slag Admixtures of AL2O3

Migas¹,

Korolczuk-Hejnak²

2014

Archives of Metallurgy and Materials

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The nature and properties of liquid solutions -metallurgical slags (used in the pig iron and steel production) affect the quality of the final product and processing time. The main object of the study was slag system: CaO-SiO 2 -MgO-Al 2 O 3 , when the content of Al 2 O 3 was raised to ca. 25% in liquid and semi-liquid state.Measurements were performed using Searle's method of concentric cylinder systems. Graphite measuring systems were used for testing with two types of bobs: smooth and perforated. Rheological measurements were carried out for five slag systems in the temperature range between 1310-1500• C, shear rate values were changed in the wide range between 1s −1 to 150/180s −1 . FactSage application was used to calculate the mass of solid phases precipitating from the slag volume for different chemical compositions at various temperatures. In the temperature range in which the solid phases occurred in the slag the analysed systems show non-Newtonian behaviour.Keywords: liquid slags, rheology, non-Newtonian flowCharakter oraz właściwości ciekłych żużli metalurgicznych (wykorzystywanych w procesach wielkopiecowym oraz stalowniczym) wpływa na jakość produktu oraz na czas prowadzonego procesu. W niniejszej pracy analizowano żużle typu CaO-SiO 2 -MgO-Al 2 O 3 , domieszkowane do ok. 25% Al 2 O 3 , w stanie ciekłym oraz stało-ciekłym.Badania zostały wykonane przy użyciu rotacyjnej metody z koncentrycznymi cylindrami typu Searle'a. Narzędzia pomiarowe wykonano z grafitu, charakteryzowały się one gładkimi oraz perforowanymi powierzchniami. Badania reologiczne wykonano dla pięciu systemów żużlowych w temperaturach 1310-1500• C. Prędkość ścinania w trakcie pomiarów zmieniana była od 1s −1 do 150/180s −1 . Pakiet FactSage został wykorzystany do obliczenia masy fazy stałej, wytrącającej się z objętości żużla, dla różnych składów chemicznych, w różnych temperaturach. W temperaturach, w których zaobserwowano występowanie fazy stałej charakter reologiczny badanych układów żużlowych odbiegał od zachowania ciała idealnego Newtona.

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Section: Results Analysissupporting

confidence: 91%

“…The authors did research into the influence of chemical composition, basicity and temperature on the viscosity. Few research centres [8,9] undertook a complicated subject and analysed the changes in the dynamic viscosity coefficient to provide a rheological description of liquid and solid-liquid multicomponent slag systems.…”

Section: Introductionmentioning

confidence: 99%

Semi-Solid State of Blast Furnace Slag Admixtures of AL2O3

Migas¹,

Korolczuk-Hejnak²

2014

Archives of Metallurgy and Materials

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“…The specific dimensions are listed in Table 2. It should be noted that the actual dimensions of these parts can change at elevated temperatures due to the thermal expansion of the materials, but the dimensional change was assumed to be negligible similar to Wright et al 14) 120 g of the sample was prepared to obtain the mold flux composition listed in Table 1 and placed into the hot zone of the furnace sufficiently purged with 0.4 L/min of Ar. The furnace temperature was calibrated before each experiment using a B-type reference thermocouple inserted from the top of the reaction tube.…”

Section: Apparatus and Proceduresmentioning

confidence: 99%

Effect of CaF2 and Li2O Additives on the Viscosity of CaO–SiO2–Na2O Slags

2011

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High aluminum containing steels react vigorously with silica-based mold fluxes to form alumina. The change in alumina content increases the viscosity and thus silica-based mold fluxes are compensated with significant amounts of Na 2 O, CaF 2 , and Li 2 O to ensure both lubrication and heat transfer control. Detailed viscosity studies using the rotating spindle method showed that additions of CaF 2 up to 8 wt% in the CaOSiO 2 -12wt%Na 2 O system at a constant CaO/SiO 2 ratio of 0.8 decreases the viscosity by breaking the network structure of molten fluxes, but is negligible above 8 wt%. A similar modification of the network was observed for Li 2 O up to 2 wt%. The viscosity data was correlated with the XPS analysis and verified CaF 2 and Li 2 O as effective in modifying complex silicate structures into simpler silicate structures depending on the availability of complex silicates and thus was limited to below certain concentrations.

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“…By comparing the measured viscosities with the calculated viscosities by different models, Du et al concluded that Einstein-Roscoe equation was the only model applicably for the systems of Liquid-2CaO.SiO 2 mixtures and liquid-MgO mixtures at the steelmaking temperature, and no modification of the model parameter was found necessary, though the particles were not spherical. 9) However, both Wright et al 7) and Seok et al 8) found that the parameters of Einstein-Roscoe equation should be adjusted to describe the viscosity variation behavior of suspension system.…”

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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Viscosity of a CaO-MgO-Al2O3-SiO2 melt containing spinel particles at 1646K

Cited by 104 publications

References 8 publications

Semi-Solid State of Blast Furnace Slag Admixtures of AL2O3

Semi-Solid State of Blast Furnace Slag Admixtures of AL2O3

Effect of CaF2 and Li2O Additives on the Viscosity of CaO–SiO2–Na2O Slags

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

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