摘要
为了研究炉渣铁水脱硫速率,在实验室条件下进行了温度为1 673～1 773 K时CaO-SiO2-Al2O3-Na2O-TiO2渣铁水脱硫的动力学试验。结果表明,随着温度的增加,脱硫速率加快,炉渣熔化效果更好。多数脱硫反应在约50 min后硫质量分数基本不变。通过建立铁水脱硫动力学的数学模型,计算脱硫过程中硫的传质系数和传质阻力。硫的传质系数范围为5.02×10-7～18.69×10-7m/s。温度为1 673～1 723 K时活化能为464.06 kJ/mol,温度为1 723～1 773 K时活化能为176.35 k J/mol。通过矿相解离分析仪（MLA）观察硫在渣铁界面附近的分布情况,结合MLA扫描图片,认为高温时硫在渣中的传质是脱硫过程的限制环节。
Kinetic experiments of the hot metal desulfurization were carried out using the CaO-SiO2-Al2O3-Na2O-TiO2 slag at 1 673 to 1 773 K in the laboratory to study the desulfurization rate. The results indicated that the desulfurization rate was accelerated and the melting effect of slag was enhanced with the temperature increasing. The sulfur content was changeless after about 50 min for most of desulfurization reactions. A mathematical model of kinetics of hot metal desulfurization was developed to calculate the mass transfer coefficients and the mass transfer resistance of the sulfur in the molten slag during the desulfurization process. The mass transfer coefficients of sulfur were in the range of 5.02×10-7-18.69×10-7 m/s. The estimated activation energy was 464.06 kJ/mol at 1 673 to 1 723 K and 176.35 kJ/mol at 1 723 to 1 773 K. The distribution of the sulfur at the slag-metal interface was observed by the Mineral Liberation Analyzer（MLA）.Combined with the image of MLA,it is finally concluded that the mass transfer of sulfur in molten slag was the restrictive step at a high temperature during the desulfurization process.
作者
张康晖
张延玲
吴拓
ZHANG Kang-hui;ZHANG Yan-ling;WU Tuo(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China)
出处
《钢铁》
CAS
CSCD
北大核心
2018年第11期22-28,共7页
Iron and Steel
基金
国家自然科学基金资助项目(51474021)
关键词
铁水
脱硫
动力学
活化能
传质系数
hot metal
desulfurization
kinetics
activation energy
mass transfer coefficient
