Effects of basicity and MgO content on the viscosity of the SiO2-CaO-MgO-9wt%Al2O3 slag system

Gao, Yunming; Wang, Shaobo; Hong, Chuan; Ma, Xiujuan; Fu, Yang

doi:10.1007/s12613-014-0916-7

Cited by 117 publications

(72 citation statements)

References 26 publications

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“…Figure 5 shows where the viscosity of the titanium slag decreases as its quaternary basicity increases, and the expanded image in Figure 6 indicates that the viscosity of titanium slag decreases as MgO content increases. Previous studies have also reported that the addition of MgO decreases slag viscosity [14,18]. In effect, addition of CaO and MgO to increase quaternary basicity can decrease the viscosity of titanium slag and promote the optimal separation of iron and slag.…”

Section: Experimental Fundamental Thermodynamicsmentioning

confidence: 97%

“…In this study, the free running temperatures were defined according to the viscosity-temperature curves ( Figures 5 and 6) as shown in Figure 7a,b: our method for doing so involved drawing a tangent line at 45 degree angle to the X axis, where the temperature of the tangent point on the curve is the free running temperature of the slag [21]. Figure 7 shows where increasing quaternary basicity by addition of CaO decreases the free running temperature until reaching a threshold at about 0.95 The [14,18]. In effect, addition of CaO and MgO to increase quaternary basicity can decrease the viscosity of titanium slag and promote the optimal separation of iron and slag.…”

Section: Experimental Fundamental Thermodynamicsmentioning

confidence: 99%

“…CaO and MgO are important additives for the electric furnace process as well as blast furnace process [11,12]. Generally, basicity and MgO are important factors that can affect a slag viscosity and melting temperature, and have been widely studied for various slag systems [13][14][15][16][17]. He [18] studied for effect of MgO on viscosity of blast furnace slag and showed that the slag viscosity decreased with the increasing of MgO content in a definite range, and it decreased obviously with the increasing of slag basicity.…”

Section: Introductionmentioning

confidence: 99%

“…Fan's experiment showed that the melting temperature of slag decreased with the increasing of MgO content in slag [16]. However, effects of basicity and MgO in many previous researches are of blast furnace slag [14,19]. The effects of basicity and MgO for vanadium titanomagnetite ore in the electric furnace smelting process are not fully understood, especially the effect of MgO in titanium slag.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Basicity and MgO in Slag on the Behaviors of Smelting Vanadium Titanomagnetite in the Direct Reduction-Electric Furnace Process

Jiang

Wang

Guo

et al. 2016

Metals

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Abstract:The effects of basicity and MgO content on reduction behavior and separation of iron and slag during smelting vanadium titanomagnetite by electric furnace were investigated. The reduction behaviors affect the separation of iron and slag in the direct reduction-electric furnace process. The recovery rates of Fe, V, and Ti grades in iron were analyzed to determine the effects of basicity and MgO content on the reduction of iron oxides, vanadium oxides, and titanium oxides. The chemical compositions of vanadium-bearing iron and main phases of titanium slag were detected by XRF and XRD, respectively. The results show that the higher level of basicity is beneficial to the reduction of iron oxides and vanadium oxides, and titanium content dropped in molten iron with the increasing basicity. As the content of MgO increased, the recovery rate of Fe increased slightly but the recovery rate of V increased considerably. The grades of Ti in molten iron were at a low level without significant change when MgO content was below 11%, but increased as MgO content increased to 12.75%. The optimum conditions for smelting vanadium titanomagnetite were about 11.38% content of MgO and quaternary basicity was about 1.10. The product, vanadium-bearing iron, can be applied in the converter steelmaking process, and titanium slag containing 50.34% TiO 2 can be used by the acid leaching method.

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Section: Experimental Fundamental Thermodynamicsmentioning

confidence: 97%

Section: Experimental Fundamental Thermodynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Basicity and MgO in Slag on the Behaviors of Smelting Vanadium Titanomagnetite in the Direct Reduction-Electric Furnace Process

Jiang

Wang

Guo

et al. 2016

Metals

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“…Typically, a WDS system will have a count rate that 10 times of an EDS system. In the review of viscosity study of CaO-MgO-Al 2 O 3 -SiO 2 , only 2 authors reported the composition analysis utilizing EPM--WDS technique [29,30].…”

Section: Epma-wdsmentioning

confidence: 99%

Viscosity Studies of High-Temperature Metallurgical Slags Relevant to Ironmaking Process

Chen¹

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Abstract:Slags are molten oxides presenting in a number of high-temperature processes. In ironmaking process, the metallurgical properties of blast furnace slags are determined largely by its viscosity. Understanding and controlling the behavior of the slag phase is crucial in improving the operational and economical efficiencies. However, high-temperature viscosity measurement is practically difficult, time-and cost-consuming. There is a necessity to develop a reliable mathematical model for the viscosity prediction through the review of experimental data and fundamental theory.As foundation work, abundant viscosity measurements and models have been examined and evaluated, including over 3000 viscosity data in the CaO-MgO-Al 2 O 3 -SiO 2 system and 16 viscosity models. Over the past 10 years, there has been increasing attentions on wide composition range of slag viscosity due to the continuous consumption of complex iron ores.In addition, the impacts of eight minor elements (including F, Ti, B, Fe, Mn, Na, K, and S) on slag viscosity have been studied for practical purpose.Slag viscosity is determined by its structure, which is the theoretical base of the mathematical model. The structures of the quenched silicate slags were quantitatively investigated utilizing Raman spectroscopy. It is accepted that the application of Raman spectroscopy can disclosure the vibration units of molten slag, which can be interpreted the structural of silicate melts (amorphous glass phase).In the blast furnace operations, some solid phases such as oxide precipitates, coke or Ti(CN) can be present in the slag. In addition, the precipitation of solid particles was commonly observed in iron, steel, copper and other pyrometallurgy process. These solids can significantly increase the viscosity of the slag causing operating difficulty. There is a research gap that the solid impact on suspension was limited investigated under high-temperature condition due to uncertainty.Referring to the research gap of viscosity study of blast furnace slag, the following goals have been achieved by the Ph.D. candidate: Declaration by authorThis thesis is composed of my original work, and contains no material previously published or written by another person except where due reference has been made in the text. I have clearly stated the contribution by others to jointly-authored works that I have included in my thesis.

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Viscosity Model for Iron Blast Furnace Slags in SiO₂–Al₂O₃–CaO–MgO System

Chen

Wei-dong

et al. 2015

steel research int.

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Operational performance of ironmaking processes is determined to a great extent by its slag viscosity. A simple and accurate viscosity model for blast furnace (BF) slags has been developed based on the Urbain model using the critically evaluated experimental data reported by the authors and other researchers. A total number of 2958 viscosity measurements from 582 compositions in the SiO2–Al2O3–CaO–MgO system have been collected from 34 publications. These data have been critically reviewed for developing a viscosity model for ironmaking slags. The model has been significantly revised by consideration of alumina behavior in this system and re‐optimization of the parameters using large quantity and high quality data. The new model has less number of parameters, but better performance in the viscosity predictions. Applications of the new viscosity model on BF operation have been discussed.

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Effects of basicity and MgO content on the viscosity of the SiO2-CaO-MgO-9wt%Al2O3 slag system

Cited by 117 publications

References 26 publications

Effects of Basicity and MgO in Slag on the Behaviors of Smelting Vanadium Titanomagnetite in the Direct Reduction-Electric Furnace Process

Effects of Basicity and MgO in Slag on the Behaviors of Smelting Vanadium Titanomagnetite in the Direct Reduction-Electric Furnace Process

Viscosity Studies of High-Temperature Metallurgical Slags Relevant to Ironmaking Process

Viscosity Model for Iron Blast Furnace Slags in SiO₂–Al₂O₃–CaO–MgO System

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Effects of basicity and MgO content on the viscosity of the SiO2-CaO-MgO-9wt%Al2O3 slag system

Cited by 117 publications

References 26 publications

Effects of Basicity and MgO in Slag on the Behaviors of Smelting Vanadium Titanomagnetite in the Direct Reduction-Electric Furnace Process

Effects of Basicity and MgO in Slag on the Behaviors of Smelting Vanadium Titanomagnetite in the Direct Reduction-Electric Furnace Process

Viscosity Studies of High-Temperature Metallurgical Slags Relevant to Ironmaking Process

Viscosity Model for Iron Blast Furnace Slags in SiO2–Al2O3–CaO–MgO System

Contact Info

Product

Resources

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Viscosity Model for Iron Blast Furnace Slags in SiO₂–Al₂O₃–CaO–MgO System