铁水脱硫渣回硫分析及聚渣剂研究

Analysis on Resulfurization Caused by Desulfurization Slag and Research on Slag Conglomeration Agent

主要研究了梅钢150t铁水包复合喷吹脱硫后脱硫渣的质量、成分、硫质量分数,以及铁水在脱硫前后成分的变化关系。在此基础上进一步研究了残留在铁水包表面的脱硫渣对炼钢回硫影响的幅度。研究结果表明,复合喷吹脱硫结束后,脱硫渣中硫质量分数在2%～3.5%之间,扒渣结束后的残渣量在100kg左右,由此渣导致的回硫最高不超过0.003%。因此,梅钢脱硫残渣对钢水回硫影响幅度较小。同时,为了进一步减小残渣回硫幅度,需向脱硫渣中加入一定量的聚渣剂,以达到改善脱硫渣流动性,提高扒渣效果。

This paper mainly studies the weight, composition, sulfur content of the desulfurization slag from 150 t ladle after composite injection desulfurization in Meishan Steel, as well as how the sulfur content in hot metal changes before and after desulfurization. Consequently it further studies the range of resulfurization caused by residue slag at the top of the ladle. The results show that after desulfurization the sulfur content of desulfurization slag is from 2 % to 3.5 %, after slag skimming the weight of residue slag is about 100 kg, and the rate of resulfurization is less than 0. 003% in hot metal. Thus, the desulfurization slag is not the main reason leading to resulfurization. Meanwhile, in order to reduce the rate of resulfurization, it can add slag conglomeration agent into the desulfurization slag to improve the effect of slag skimming and reduce the amount of residue slag, iron loss also can be decreased.