Multistage desulfurization mechanism to reduce sulfur content of high ferrotitanium prepared using thermite method

• 作者: Chu Cheng Zhi-He Dou Ting-An Zhang Yu-Lai Song
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 2313-2319
• 页数: 7页
• 语种: 英文

摘要

High ferrotitanium is used as a deoxidizer and alloying agent in steelmaking processes and is mainly produced using high-cost remelting processes.The ther-mite method is a simple and low-cost method for preparing low ferrotitanium.However,the high levels of S,Al,and O residues in the product severely restrict its applicability in the low-cost preparation of good-quality high ferrotita-nium.In this study,a novel multistage deep reduction method for preparing high-quality high ferrotitanium is proposed,and the multistage desulfurization mechanism is systematically investigated.The results indicate that mul-tistage desulfurization is an effective method for reducing the S content of high ferrotitanium prepared via the ther-mite method.During the strong desulfurization stage,Ti2S reacts with CaO at the slag-metal interface and produces CaS.The S content decreases,while the O content increases,with the increase of CaO in the CaO-Al2O3-based slag.During the deep desulfurization,Ti2S is deeply reduced by the Ca and produces CaS,thus further reducing the S content.The S content decreases with the incremental addition of Ca and can be reduced to 0.035 wt％ after multistage desulfurization.