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

Abstract

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.

Magnesium Non-metallic Inclusions in Non-oriented Electrical Steel Sheets

“…23) Various reductants could act as the reducing agent for MgO, e.g., Al, C, Si. 24) Comparing the reactions of the reduction of MgO in molten slag and in refractory material, the reaction in molten slag is more dominant.…”

“…desulphurization with magnesium, can be written as: 24) Mg ( The image of a MgS inclusion embedded in a ferrite matrix is shown in Fig. 2.…”

The Effect of Magnesium Gas Injecting Conditions on the Rate of Hot Metal Desulfurization

“…[1][2][3][4] The present study proves the possibility on the basis of 30 kg scale experiments. Conbination of dilution of magnesium gas by argon gas and use of the injector which has 6 narrow exit holes allows to obtain magnesium efficiency of 74 % at a quantity of magnesium of 0.2 kg per ton hot metal at the initial sulfur content of 0.02 mass%.…”

“…In steelmaking processes, reduction of slag and dust as well as recycle and treatment of these by-products are important subjects. Magnesium desulfurization of hot metal itself is a well known technology, 5) but Yang et al [1][2][3][4] have shown a possibility of highly efficient magnesium desulfurization of hot metal as shown in Fig. 1.…”

Desulfurization Technology in the Blast Furnace Raceway by MgO–SiO2 Flux Injection

“…They attributed the decrease to the generation of magnesium gas in the vicinity of the tuyeres. Yang et al, [6][7][8][9][10] who are studying the desulfurization of molten iron using the magnesium gas generated from carbon and magnesium oxide in the steelmaking process, report that this desulfurization is highly effective.…”