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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。
The desulfurization process of high nitrogen steel prepared by electroslag remelting was studied. High nitrogen steel was prepared by using different slag system and smelting rate respectively. Electron microscopy and compositional analysis of the inclusions before and after ESR showed that the average diameter and area per unit area of sulfide inclusions were greatly reduced, and the main types of inclusions were MnS + Al2O3 composite inclusions; moderate increase of CaO Content can improve the sulfur distribution ratio, is an effective means to improve the efficiency of desulfurization. Meanwhile, the experimental results show that the remelting rate has an important impact on the desulfurization rate in ESR. Through the deduction of desulfurization kinetics, it is found that the lower the remelting rate is, the more obvious the desulphurization effect is. However, it is found that the desulphurization rate decreases at first and then increases with the decrease of remelting rate. The reason is that sulphide enrichment occurs in the slag pool , Resulting in “back to sulfur ” phenomenon, reducing the desulfurization rate.