120t转炉冶炼过程硫含量控制与分析

为了实现低硫洁净钢种(w([S])≤0.006%)的稳定生产,通过对渣钢间脱硫反应热力学计算,在结合某厂生产实践的基础上,分析了该厂120t转炉冶炼低硫洁净钢种时相关增硫因素,提出减少KR脱硫渣、废钢和造渣料等入炉原辅料硫质量分数和优化转炉冶炼工艺参数等控制措施,为转炉冶炼低硫钢水和加强终点硫控制提供参考借鉴。结果表明,控制入炉原辅料钢水增硫质量分数Δw([S])≤0.008 22%,转炉终点温度为1 640～1 680℃、炉渣碱度为3.0～4.0、渣中w((FeO))为10%～18%、渣钢硫分配比L_S为5.11～8.16、转炉终点硫质量分数合格率由80%提升至98%。

Analysis and control on sulfur content in process of 120 t converter steelmaking

In order to achieve the stable production of low-sulfur clean steel (w([S])≤0.006%), the thermodynamics of the desulfurization reaction between the slag and steel are calculated,based on the production practice of a certain plant,the relevant sulfur increase factors when making low-sulfur clean steeln 120 t converter of the plant are analyzed.Control measures such as reducing the sulfur content of raw and auxiliary materials and reducing KR desulfurization slag,scrap and slagging materials and optimizing converter smelting process parameters are proposed.It provides a reference for converter smelting low-sulfur molten steel and strengthening end-point sulfur control.The results show that the sulfur-increasing content of raw and auxiliary materials in the furnace less than 0.008 2%,the converter end temperature between 1 640-1 680 ℃,the slag basicity between 3.0-4.0,and the w((FeO)) in the slag between 10%-18%,the slag steel sulfur distribution ratio L_S between 5.11-8.16,and the final sulfur content pass rate of the converter is increased from 80% to 98%.