钢铁厂典型粉尘的基本物性与利用途径分析

Study on Basic Properties of Typical Industrial Dust from Iron and Steel Plant and Analysis of Its Utilization

对钢铁生产流程中产生的几种典型粉尘采用化学分析,激光粒度仪,偏光显微镜,扫描电镜和XRD等手段进行了分析,结果表明,粉尘含铁量高,粒度细且含有多种杂质元素;高炉干灰碳含量为34.00%,锌含量为16.60%且以铁酸锌形式弥散分布;烧结三电场除尘灰钾含量为15.88%且以氯化钾形式存在.对比了烧结、球团、直接还原和炼钢处理粉尘的优缺点,着重分析转底炉直接还原处理粉尘的优势,并在实验室条件下模拟转底炉直接还原工艺,在1250℃下还原15min时,得到金属化率大于75%,脱锌率大于95%,脱钾、钠率大于80%和残碳量低于0.2%的金属化球团.

Typical dust generated in iron and steel making was analyzed by chemical analysis,laser particle analyzer,micropolariscope,SEM and XRD. The result showed the dust had high iron content,petty particle size composition and many kinds of harmful impurities. There were 34.00% carbon and 16.60% zinc in dust dried in BF. Zinc formed zinc ferrite which was distributed evenly and widely. Potassium content was 15.88%, which formed KCl in fact. Merits and defects were contrasted on disposing of dusts by sintering,agglomeration,direct reduction and steelmaking. The merits of disposing dust by RHF were mainly analyzed. The metallized pellets with more than 75% metallization rate,more than 95% dezincing rate,more than 80% dekaliuming and denatriuming rates were obtained at 1250℃ and in 15 min reduction during RHF direct reduction being simulated in lab.