Abstract: Experimental study on preparation of metallization pellets with BF gas dust and converter sludge was carried out. Their chemical composition, phase, particle size distribution and bulk density were analyzed, and the effects of reduction temperature, reduction time and C/O on the metallization were investigated. The results showed that iron oxide, flux and carbon had high content in the dust and sludge, which were in uniform distribution and good contact. Harmful element zinc in the form of ZnFe2O4 existed in the mixture phase of other oxides. Their bulk density was small (<1.5 g/cm3), and they contained numerous coarse particles with more than 1.5 mm diameter. With increasing of reduction temperature, prolonging of reduction time and reducing of C/O ratio, the metallization rate and dezincing degree went up, and the effect of temperature was the most significant. 85% metallization rate and 90% dezincing degree were achieved when C/O=1.0 under reduction temperature above 1220℃ and reduction time over 30 min.

Key words: BF gas dust, converter sludge, metallization pellets, metallization rate, dezincing degree

摘要： 用高炉瓦斯灰和转炉污泥造块后制备了金属化球团. 分析了两种尘泥的化学成分、物相组成及分布、粒度组成及堆密度等物化性质，考察了金属化处理温度、时间和原料C/O对球团金属化效果的影响. 结果表明，铁氧化物、熔剂氧化物及固体碳在两者中均含量较高，分布均匀，接触良好，锌以ZnFe2O4存在于CaO、MgO混合物相中. 两种尘泥堆密度均较小(<1.5 g/cm3)，且含较多大于1.5 mm的粗颗粒. 提高金属化处理温度，延长处理时间及降低原料C/O，球团的金属化率、脱锌率均增大，其中温度的影响最为显著. 在C/O=1.0，金属化温度>1220℃，时间>30 min时，可获得金属化率大于85%，脱锌率大于90%的金属化球团.

关键词: 高炉瓦斯灰, 转炉污泥, 金属化球团, 金属化率, 脱锌率