Analysis of pig iron desulfurization with mixtures from the CaO-Fluorspar and CaO-Sodalite system with the use of computational thermodynamics

Grillo, Felipe Fardin; Sampaio, Raphael de Alcantara; Viana, José Flávio; Espinosa, Denise Crocce Romano; Oliveira, José Roberto de

doi:10.1590/s0370-44672013000400009

Cited by 12 publications

(4 citation statements)

References 3 publications

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“…7, obtained from Table 1 According to Niedringhaus and Fruehan 14) , Ohya 15) and Seok et al 16) , increasing the of 3CaO.SiO 2 , 3CaO.Al 2 O 3 and 2CaO.SiO 2 compounds in the slag is detrimental to the desulphurization, since it can form a layer around the CaO particles, and it hinders sulphur diffusion into the particle core of CaO. [16][17][18][19] , these compounds impair the desulphurization, once a solid-phase layer is formed around the CaO particle, which limiting the sulphur mass transportation.…”

Section: Analysis Of the Experimental Tests By Computational Thermodymentioning

confidence: 99%

Use of Computational Thermodynamics in the Analysis of Hot Metal Desulphurization with Slags Based on Marble Waste and Sodalite

et al. 2016

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The steel industry is going through transformations aiming at the innovation and use of alternative raw materials. Thus, the use of industrial wastes in synthetic slag production is considered an important alternative to search for new materials and waste reuse. Therefore, the aim of the current study is to study the use of synthetic slags in hot metal desulphurization. It was proposed the use of sodalite instead of uorspar and the use of marble waste instead of lime. Marble waste was characterized by chemical analysis, X-ray diffraction (XRD) and thermogravimetric analysis. The XRD showed the presence of compounds such as CaCO 3 , MgCO 3 and SiO 2 . Subsequently, simulations using Thermo-Calc were performed in order to obtain thermodynamic data of the present phases, and to compare them to experimental data. The experimental procedures were carried out at 1400 C. In addition, hot metal tests were performed using an alumina rotor to increase the desulphurization. In hot metal desulphurization, solid CaO phase was responsible for sulfur removal. Furthermore, Ca 3 O 3 .SiO 2 and Ca 3 O 3 .Al 2 O 3 phases limited the reaction, and their concentrations were higher in the slags with marble waste and sodalite, due to the presence of SiO 2 and Al 2 O 3 in these raw materials.

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Section: Analysis Of the Experimental Tests By Computational Thermodymentioning

confidence: 99%

Use of Computational Thermodynamics in the Analysis of Hot Metal Desulphurization with Slags Based on Marble Waste and Sodalite

et al. 2016

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“…Then, the mixtures contained higher percentages of CaO in the compositions (CICA5 and CIRM10). The higher thermodynamic potential to desulfurization do not mean higher desulfurization yield, since kinetic factors should be considered (5,6) . Table 5 shows both liquid and solid phases contained in the initial mixtures, phases formed in the solid and the equilibrium sulfur content when only the liquid phase is considered in the desulfurization [Seq]liq.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Cast Iron Desulfurization With Synthetic Slags

Grillo¹,

Junca²,

Pezzin³

et al. 2017

Anais Do Seminário De Aciaria, Fundição E Metalurgia De Não-Ferrosos

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The aim of this work was to study the use of slags to desulfurization of cast iron. It was proposed to use alumina instead fluorspar. In addition, marble waste was used instead lime. Simulations applying Thermo-Calc software were performed in order to obtain the theoretical phases thermodynamic data. Then, a comparison between theoretical data and experimental tests were performed. The cast iron was melting in induction furnace at 1550°C. Slags composed mainly for CaO and Al2O3 were used to cast iron desulphurization. It was observed that increasing liquid phase, the desulphurization reaction was favored. Besides, it was found that cast iron desulfurization occurs by top slag mechanism.

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“…However, kinetic parameter should be also considered to indicate the better synthetic slag 13,14 . Figure 5 shows the sulfur variation as a function of time for slags containing conventional lime and slags containing marble waste.…”

Section: Desulfurization Experimentsmentioning

confidence: 99%

Development of Synthetic Slag with Marble Waste and Calcium Aluminate Agents for Cast Iron Desulfurization

et al. 2017

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The aim of this work was to study the use of slags to desulfurize cast iron. It was proposed to use alumina instead of fluorspar. In addition, marble waste was used instead of lime. Simulations applying Thermo-Calc ® software were carried out in order to obtain the theoretical phases using thermodynamic data. Then, a comparison between theoretical data and experimental tests were performed. Cast iron was melted in induction furnace at 1550ºC. Slags composed mainly for CaO and Al 2 O 3 were used to desulfurize cast iron. The results showed that the desulphurization reaction was favored when the liquid phase was increased. Furthermore, it was found that cast iron desulfurization occurs by top slag mechanism. Furthermore, the desulfurization tests showed a decrease up to 90.10% in the sulfur content to the mixture containing conventional lime and 87.25% to the mixture RMF15. The slags obtained from marble waste contained MgO, which it interfered negatively in the desulfurization yield. In addition, increasing the CaO particle diameter improved the desulfurization process. The desulphurization process more favored to particle size of 500-1000 µm.

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Analysis of pig iron desulfurization with mixtures from the CaO-Fluorspar and CaO-Sodalite system with the use of computational thermodynamics

Cited by 12 publications

References 3 publications

Use of Computational Thermodynamics in the Analysis of Hot Metal Desulphurization with Slags Based on Marble Waste and Sodalite

Use of Computational Thermodynamics in the Analysis of Hot Metal Desulphurization with Slags Based on Marble Waste and Sodalite

Evaluation of Cast Iron Desulfurization With Synthetic Slags

Development of Synthetic Slag with Marble Waste and Calcium Aluminate Agents for Cast Iron Desulfurization

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