On the Desulfurization Rate of Hot Metal by Magnesium Injection

Nakanishi, Koji; Ejima, Akio; Suzuki, Tohru; Sudo, Fumio

doi:10.2355/tetsutohagane1955.64.9_1323

Cited by 30 publications

(29 citation statements)

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“…9(a), when the mass transfer rate of sulfur in the melt is much greater than that of magnesium in the bubble, the rate controlling step is the mass transfer of magnesium in the bubble and the desulfurization site is on the bubble surface. Nakanishi et al 6) assumed the desulfurization site was also on the bubble surface, but the rate-controlling step was assumed to be the mass transfer of sulfur in the melt because the magnesium partial pressure in the bubble was very high and the sulfur concentration in the melt was relatively low in their case. Figure 9(b) shows a case, in which the mass transfer rate of magnesium in the bubble is much greater than that of sulfur in the melt.…”

Section: Mechanism Of Desulfurization With Magnesium Vapor Produced Bmentioning

confidence: 99%

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Desulfurization of Molten Iron with Magnesium Vapor Produced In-situ by Aluminothermic Reduction of Magnesium Oxide.

et al. 2001

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Magnesium vapor produced in-situ by aluminothermic reduction of magnesium oxide was injected directly into the melt with argon carrier gas to desulfurize molten iron to an ultra-low sulfur concentration in a short time.The desulfurization rate increased with increasing temperature in the range from 1 553 to 1 773 K. The desulfurization efficiency of pellet increased with decreasing pellet mass. The effects of initial sulfur concentration and carrier gas flow rate on the desulfurization were also investigated.A mathematical model is developed to calculate the desulfurization rate and good agreement is obtained between calculated and experimental results. The calculated results show that when the initial sulfur concentration is not very high, the mass transfer rate of magnesium in the bubble is faster than that of sulfur in the melt. The amount of desulfurization during the bubble ascent period is 3.5-9.3 times larger than that during the bubble formation period. Effects of the pellet mass and the initial sulfur concentration on desulfurization can be well explained by the present mathematical model.

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Section: Mechanism Of Desulfurization With Magnesium Vapor Produced Bmentioning

confidence: 99%

“…On the other hand, Nakanishi et al 6) assumed that the solubility of magnesium in molten iron was too low for significant amount of magnesium to dissolve, and most of the desulfurization took place on the bubble surface. The ratecontrolling step was the mass transfer of dissolved sulfur in the melt.…”

Section: Introductionmentioning

confidence: 99%

Desulfurization of Molten Iron with Magnesium Vapor Produced In-situ by Aluminothermic Reduction of Magnesium Oxide.

et al. 2001

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“…[6][7][8][9][10][11][12][13] Compared with calcium-based agents, the magnesium vapor produced by the evaporation of magnesium metal or by aluminothermic reduction of magnesium oxide under high temperature, is more superior for hot metal desulfurization. However, most of the previous research have showed that the desulfurization efficiency of magnesium-based was still very low in desulfurizing the molten iron to an ultralow sulfur level.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Gas-liquid Flow in Mechanical-Gas Injection Coupled Stirred System

Shao

Zhang

et al. 2014

ISIJ Int.

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Based on Euler-Euler approach, a mathematical model is established to describe gas and liquid twophase flow in the mechanical-gas injection coupled stirred system for steelmaking, and the effects of different location and rotation speed of impeller, and gas flow rate on the bubble dispersion, gas total volume and mixing time in the bath were studied. The results show that the predicted bubbles dispersion and mixing time agree well with the experimental photos and measured data. With the increasing of impeller eccentricity, the bubbles dispersion become more better, and the mixing time decreases, while the gas total volume first decreases and then increases. With the increasing of rotation speed of impeller, the bubble dispersion becomes better, and the gas total volume the mixing efficiency also increases. But these effects become weak when the rotation speed exceed 200 rpm. With the increasing of gas flow rate, the bubble dispersion remain basically unchanged, and the gas total volume gradually increase, but the mixing time would rapidly increase. It is recommended to use the impeller placed at radial position of 0.4 R (R is the radius of bath), rotation speed of 200 rpm, and gas flow rate not exceeding 2.0 Nm 3 /h for present system.

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“…Owing to its strong affinity for sulfur and oxygen, attention is paid to magnesium as a desulfurizer or deoxidizer. Several methods have been studied for magnesium desulfurization, such as magnesium injection, 1) magnesium wire, 2) Mag-Coke, 3) Mag-Lime 4) addition and CaO-magnesium powder injection. 5) In each method, desulfurization efficiency of magnesium was not high enough because large amount of magnesium was lost from the iron due to high vapor pressure of magnesium.…”

Section: Introductionmentioning

confidence: 99%

Carbothermic Reduction of MgO by Microwave Irradiation

Yoshikawa

Morita

2003

Mater. Trans.

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A new method has been developed to produce magnesium vapor for deoxidation or desulfurization of molten iron. Microwave heating of magnesium oxide and graphite powder mixtures was carried in air or argon flowing atmosphere, utilizing a commercial microwave oven operated at 2.45 GHz. Progress of carbothermic reduction of MgO was observed, and the influences of morphology and carbon content of the samples on the heating behavior and the fractional reduction of MgO were investigated. Particularly, the initial graphite particle size was found as an important factor for heating and reduction behavior. Also, MgO-C brick was subjected to the microwave treatment and was found to be a candidate as Mg sources.

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On the Desulfurization Rate of Hot Metal by Magnesium Injection

Cited by 30 publications

References 2 publications

Desulfurization of Molten Iron with Magnesium Vapor Produced In-situ by Aluminothermic Reduction of Magnesium Oxide.

Desulfurization of Molten Iron with Magnesium Vapor Produced In-situ by Aluminothermic Reduction of Magnesium Oxide.

Numerical Simulation on Gas-liquid Flow in Mechanical-Gas Injection Coupled Stirred System

Carbothermic Reduction of MgO by Microwave Irradiation

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