| 电渣重熔工艺对高氮钢脱硫的影响 |
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| 摘 要： | 对电渣重熔制备高氮钢的脱硫过程进行了研究,分别采用不同渣系和熔炼速率对高氮钢进行制备。对电渣重熔前后夹杂物进行电镜及成分分析,分析结果表明:硫化物夹杂的平均直径和单位面积数量大大减少,夹杂物的主要类型为MnS+Al2O3复合型夹杂物;适度提高渣中CaO含量可提高硫分配比,是提高脱硫效率的有效手段。同时,实验结果表明重熔速率对电渣重熔中的脱硫率具有重要影响。通过脱硫动力学推导,发现重熔速率越低,脱硫效果越明显,但实验发现脱硫率随重熔速率的降低有时呈现先降低后升高的趋势,其原因在于渣池中发生硫化物富集,导致"回硫"现象发生,降低了脱硫率。
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Effect of ESR technology on desulfurization of high nitrogen steel |
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| Authors: | TANG Xu-wei ZHU Rong LI Chao LIU Wei |
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| Affiliation: | 1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China ;2. Beijing Key Laboratory of Special Melting and Preparation of High-end Metal Materials, Beijing 100083, China |
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| Abstract: | The desulfurization process of high nitrogen steel in ESR process was studied when different slag systems and remelting rates were adopted. The inclusions and their chemical composition were analyzed by SEM before and after ESR. The results indicate that the average diameter and quantity of sulfide inclusion decrease after ESR process. The typical inclusion is MnS+Al2O3. Slag system with proper CaO content has better desulfurization effect due to higher sulfur partition ratio. Meanwhile, it is found that remelting rate has great influence on desulfurization rate. In desulfurization kinetic study, desulfurization rate will increase when remelting rate is reduced. But sometimes, according to the experimental results, the desulfurization rate decreases firstly and then recovers when remelting rate drops. The enrichment of sulfide in slag results in resulfurization in steel, which leads to lower desulfurization rate. |
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| Keywords: | high nitrogen steel slag system desulfurization rate sulfur partition ratio kinetic |
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