マグネシアのアルミニウム熱還元反応を用いたその場製造マグネシウム蒸気による溶鉄の脱酸

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Syuopsis: A novel method of deoxidation ofmolten iron is proposed with magnesium vapour produced in-situ by aluminothermic reduction of magnesia. A reaction model is developed to examine the rate controlling mechanism and highly efficient deoxidation with magnesium vapour. It is shown that, in order to achieve the high efficiency, control of the magnesium vapour pressure in the injected bubble is essential. In the experiments, the pressure of Mg vapour in the injected bubble was changed with pellet mass, pellet charging methodj Ar carrier gas fiow rate, size of MgO powder in the pellet and reduction temperature of pellet. It is found that the calculated results are well consistent with the experimental results. In the early period ofthe experiment, the Mg pressure in the bubble is high, so that the deoxidation rate is controlled by the mass transfer of oxygen in the melt. In the following perio~ the Mg pressure becomes lower, and the deoxidation rate is controlled by the mass transfer of Mg vapour in the bubble and oxygen in the melt. The experimental results show that the deoxidation efficiency increased with increasing Ar carrier gas fiow rate and decreasing reduction temperature of pellet. Dividing the pellet charging into several portions is also effective to increase the deoxidation efficiency. It is shown that all these changes in the operating conditiops are concerned with the control of the Mg vapour pressure in the injected bubble for improving the deoxidation process.
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マグネシアのアルミニウム熱還元反応を用いたその場製造マグネシウム蒸気による溶鉄の脱酸

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