Development of New Iron and Steel Refining Process with In-Situ Produced Alkaline Earth Metal Vapor

原位产生碱土金属蒸气钢铁精炼新工艺的开发

• 批准号: 11555192
• 负责人: SANO Masamichi
• 金额: $ 7.87万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555192/
• 关键词: Iron and Steel Refining; Reduction Refining; Magnesium; Desulfurization; Deoxidation; Carbothemic Reduction; Aluminothermic Reduction; Magnesia; アルカリ土類金属; 脱燐

Recently, demands for high quality steel are becoming more and more severe, so that the steel industry is requested to sepply highly pure and clean steel. As is well known, magnesium has strong affinity to sulfur and oxygen. Hence, magnesium can be a strong desulfurization and deoxidation reagent, and reduce the sulfur and oxygen concentration ultra low, the vaporization loss of magnesium at the addition to the melt is large, and the refining cost is very high. Consequently, magnesium has not been used in the practical refining operation.The purpose of the present study is to achieve the efficient and low cost refining with magnesium, and safe operation of magnesium addition to the melt. Magnesium vapor produced in-situ by carbothermic and aluminothermic reduction of magnesia was used to desulfiirize and deoxidize molten iron. The experimental result was discussed from the view point of process engineering. In the experiments, the pellets, which was composed of magnesia and aluminum po … More wders, were charged into an alumina, magnesia or graphite tube. The tube was immersed into the iron melt. The pellets were heated by heat transfer from the melt to produce magnesium vapor, which was injected into the melt together with carrier gas through holes drilled at the lower part of the tube. The injected magnesium reacted with sulfur and oxygen in the melt.The experimental conditions were varied widely, such as masses of molten iron and pellets, carrier gas flow rate, initial sulfur and oxygen concentrations, temperature, composition of pellets, powder size of magnesia, and dividing pellet charging into several portions. Since the production rate of magnesium by the carbothermic reduction of magnesia was slow, the desulfurization and the deoxidation of molten iron proceeded slowly, and the refining rates were controlled by the supply of magnesium. On the contrary, the aluminothermic reduction of magnesia was very fast, and the rates of desulfurization and deoxidation was very large. But, the partial pressure of magnesium at the initial stage of the experiment was so high that the desulfurization and the oxidation efficiencies were very low. It is demonstrated that the optimal control of the magnesium partial pressure in the injected bubble can improve the refining efficiency of magnesium drastically, and the refining cost and the amount of slag discharge can be reduced sharply. Less

近年来，对高质量钢的需求越来越大，因此要求钢铁工业生产高纯洁净钢。众所周知，镁对硫和氧具有很强的亲和力。因此，镁可以是强的脱硫和脱氧剂，并且将硫和氧浓度降低到超低，在加入熔体时镁的蒸发损失大，并且精炼成本非常高。本研究的目的是实现镁的高效、低成本精炼，以及镁在熔体中的安全添加。利用碳热法和铝热法还原氧化镁原位生成的镁蒸气对铁水进行了精炼和还原。从过程工程的角度对实验结果进行了讨论。在实验中，以镁铝球团为原料， ...更多信息 将填料装入氧化铝、氧化镁或石墨管中。管子被浸入铁熔体中。通过来自熔体的热传递加热粒料以产生镁蒸气，镁蒸气与载气一起通过在管的下部钻的孔注入熔体中。实验中对铁水和球团质量、载气流量、初始硫浓度、氧浓度、温度、球团成分、氧化镁粒度、球团分次加料等条件进行了广泛的研究。由于氧化镁碳热还原法生产镁的速度慢，铁水的脱硫和脱氧进行得慢，精炼速度受镁供应的控制。相反，氧化镁的铝热还原速度很快，脱硫和脱氧速率都很大。但是，在实验的初始阶段镁的分压很高，脱硫和氧化效率很低。结果表明，通过对喷射气泡内镁分压的优化控制，可以大幅度提高镁的精炼效率，降低精炼成本和排渣量。少

项目成果

Masamichi Sano 他: "Effects of Operating Parameters on Desulfurization of Molten Iron with Magnesium Vapor Produced In-Situ by Aluminothemic Reduction of Magnesium Oxide"ISIJ International. Vol.42 (印刷中). (2002)

Masamichi Sano 等人：“操作参数对氧化镁铝热还原原位产生的镁蒸气脱硫的影响”ISIJ International 第 42 卷（出版中）。

佐野正道 他: "マグネシアの炭素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硫"鉄と鋼. 87巻・10号. 635-642 (2001)

Masamichi Sano 等人：“利用氧化镁的碳热还原反应对铁水进行脱硫”，Tetsu-to-Hagane，第 87 卷，第 10 期。635-642 (2001)。

Masamichi Sano 他: "Improvement on Desulfurization Efficiency of Molten Iron with Magnesium Vapor Produced In-Situ by Alurninothermic Reduction of Magnesium Oxide"(発表予定).

Masamichi Sano 等人：“利用氧化镁铝热还原原位产生的镁蒸气提高铁水脱硫效率”（待提交）。

Masamichi Sano, et al.: "Deoxidation of Molten Iron with Magnesium Vapor Produced In-Situ by Aluminothermic Reduction of Magnesia"Tetsu-to-Hagane. Vol. 88-No.6(in press). (2002)

Masamichi Sano 等人：“通过氧化镁铝热还原原位产生的镁蒸气对熔融铁进行脱氧”Tetsu-to-Hagane。

Masamichi Sano, et al.: "Improvement Desulfurization Efficiency of Molten Iron with Magnesium Vapor Produced In-Situ by Aluminothermic Reduction of Magnesium Oxide"(to be contributed).

佐野正通等：“利用氧化镁铝热还原原位产生的镁蒸气提高铁水脱硫效率”（待投稿）。