Removal of Sulfur from CaF2 Containing Desulfurization Slag Exhausted from Secondary Steelmaking Process by Oxidation

Hiraki, Tatsurou; Kobayashi, Jin; Urushibata, Satomi; Matsubae, Kazuyo; Nagasaka, Tetsuya

doi:10.1007/s11663-012-9685-8

Cited by 17 publications

(9 citation statements)

References 16 publications

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“…These results differ considerably compared to what was recently reported by Hiraki et al [5]. The authors reported a degree of sulfur removal above 90 % after 60 min of reaction with Ar-O 2 (p O 2 was 0.21 atm) gas mixture at 1373 K. They also report a considerable effect of temperature, in the temperature range 1173-1373 K. However, there are some significant differences in experimental conditions between the study of Hiraki et al and the present work.…”

Section: Sulfur Removal Of Solid Slagcontrasting

confidence: 99%

“…Hiraki et al used 0.5 g of slag (\212 lm in size) in a crucible with inner diameter of 27 mm. Additionally, Hiraki et al used a slag containing considerable less sulfur (0.19 mass%) and large amount of CaF 2 (6.58 mass%) [5]. Both the differences in the nature of the slag and the ratio of mass/surface area could be the factors leading to the great difference in sulfur removal.…”

Section: Sulfur Removal Of Solid Slagmentioning

confidence: 99%

“…Earlier studies on liquid blast furnace slags reported that sulfur could escape from the slag in the form of S 2 , SO 2, or as H 2 S [3,4]. Recently, it was reported that sulfur could efficiently be removed from solid ladle slag containing CaF 2 by reaction with Ar-O 2 mixture at temperatures above 1273 K [5]. It would be interesting to investigate this further in the case of ladle slag without CaF 2 .…”

Section: Introductionmentioning

confidence: 98%

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Possibility of Sulfur Removal from Ladle Slag by Oxidation in the Temperature Range 1373–1673 K

Allertz

Sichen

2015

J. Sustain. Metall.

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Experiments were conducted to investigate the possibility of removing sulfur from used ladle slag by oxidation. Slag samples (solid, two-phase mixture, and liquid with a small fraction of solid MgO particles) were subjected to an oxygen-rich atmosphere in the temperature range 1373-1673 K. The sulfur removal from the samples of solid and two-phase mixture was found to be a slow process due to the slow diffusion. The sulfur removal was found to have little dependence on temperature in the range 1373-1573 K. When the slag was mostly liquid (at 1673 K), the sulfur removal was significantly increased. More than 85 % of the sulfur could be removed after 60 min of oxidation in pure oxygen. An increase in oxygen partial pressure was found to increase the desulfurization slightly. Increasing the Al 2 O 3 content in the slag decreased the degree of sulfur removal.

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Section: Sulfur Removal Of Solid Slagcontrasting

confidence: 99%

Section: Sulfur Removal Of Solid Slagmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Possibility of Sulfur Removal from Ladle Slag by Oxidation in the Temperature Range 1373–1673 K

Allertz

Sichen

2015

J. Sustain. Metall.

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“…Experimental condition of CaS oxidation in previous worksBrought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 6/8/15 5:05 AM process was successfully achieved by oxidation with air at 1373 K[49].…”

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confidence: 99%

Oxidation of Pure Solid CaS with Ar-O₂ Gas Mixture

Kobayashi

Hiraki

Nagasakaki

2012

High Temperature Materials and Processes

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Synopsis:Oxidation behavior of CaS in oxidizing atmo sphere has been investigated for the regeneration process of desulfurization slag by oxidation. The temperature range of oxidation of CaS reagent with Ar21%O 2 gas was 973 to 1423 K. The weight gain was observed in the lower temperature range and reached at the maximum value at 1173 K while weight gain turned to decrease when the reac tion temperature was higher than 1173 K. It was clarified that CaS was oxidized to CaSO 4 under 1173 K or to CaO over 1373 K by the measurement of oxidation rate, XRD and thermodynamic analysis. The results strongly suggested that sulfur removal from the sulfur containing slag may be possible at temperatures of 1223 K or higher by the oxida tion of with air.

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“…In order to realize the minimization of the residual slag, the treatment of the final slag would be considered. According to the research by Hiraki [28], the sulfur from the desulfurization slag in steelmaking process could be removed via oxidation using O 2 and evaporation as SO 2 gas. The oxidation treatment for the regeneration of slag enables the reuse of the desulfurization slag.…”

Section: Resultsmentioning

confidence: 99%

A new method of red mud recycling in the process of hot metal pretreatment

Zhang

Liu

Jiang

2020

Metall. Res. Technol.

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To realize a large-scale consumption of red mud in the steelmaking industry, a new recycling method was investigated through the pre-reduction roasting experiment and the slag-metal interaction experiment simulating the hot metal pretreatment process in the steelmaking industry. In virtue of the sensible heating of the hot metal and the reducibility of [C] and [Si], the iron could be separated and recovered from the pre-reduced red mud pellets into the hot metal directly with a recovery rate exceeding 75%. With the composition adjustment of the residual oxides in the pre-reduced red mud (PRRD) using CaO and Al2O3 or aluminium dross (AD), a slag having a low melting point (below 1300 °C) and a high sulfide capacity (lgCS = −2.3) was formed, and more than 94% of [S] in the hot metal could be removed into this slag through the slag-metal interaction. The desulfurization efficiency of the flux (PRRD-CaO–Al2O3; PRRD-CaO–AD) is approximate to the traditional desulfurizing flux (CaO–CaF2). The advantages of this method are summarized as the low energy cost and the slag valorization.

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Removal of Sulfur from CaF2 Containing Desulfurization Slag Exhausted from Secondary Steelmaking Process by Oxidation

Cited by 17 publications

References 16 publications

Possibility of Sulfur Removal from Ladle Slag by Oxidation in the Temperature Range 1373–1673 K

Possibility of Sulfur Removal from Ladle Slag by Oxidation in the Temperature Range 1373–1673 K

Oxidation of Pure Solid CaS with Ar-O₂ Gas Mixture

A new method of red mud recycling in the process of hot metal pretreatment

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Removal of Sulfur from CaF2 Containing Desulfurization Slag Exhausted from Secondary Steelmaking Process by Oxidation

Cited by 17 publications

References 16 publications

Possibility of Sulfur Removal from Ladle Slag by Oxidation in the Temperature Range 1373–1673 K

Possibility of Sulfur Removal from Ladle Slag by Oxidation in the Temperature Range 1373–1673 K

Oxidation of Pure Solid CaS with Ar-O2 Gas Mixture

A new method of red mud recycling in the process of hot metal pretreatment

Contact Info

Product

Resources

About

Oxidation of Pure Solid CaS with Ar-O₂ Gas Mixture