高炉粉尘和转炉尘泥的还原脱锌试验

Experimental Study on Dezincification of BF Dust and Converter Sludge by Reduction

分析了高炉瓦斯泥、布袋除尘灰和转炉污泥三种粉尘的化学组成、粒度组成和物相分布等物化性质。用热力学软件Factsage验证了还原脱锌的可行性,并通过TG-DSC试验确定了反应的初始温度。进而试验考察了还原气氛、温度、时间、C/O对粉尘脱锌率和金属化率的影响。结果表明:粉尘球团可以在弱氧化气氛下进行还原,粉尘球团的脱锌率和金属化率随温度、时间的增加而升高。在球团C/O=1.1,还原温度为1 300℃下还原40 min后,球团的金属化率大于85%,脱锌率大于95%。

Physicochemical properties including chemical composition, particle size distribution and phase of BF dust, dust collected by bagtype collector and converter sludge were analyzed. The feasibility for dezincification by reduction was validated by thermodynamic software Factsage and the initial tempera ture for the reduction was obtained by TGDSC experiment. Furthermore, the effect of reduction atmos phere, temperature, time and C/O ratio on the metallization and dezincification rate of the abovemen tioned dusts and sludge were investigated. Results show that dust pellets can be reduced in weak oxidiza tion atmosphere, and the dezincification rate and metallization rate of the dust pellets increase with the in crease of temperature and time. With C/O ratio of 1.1, reduction temperature of 1 300 ℃ and reduction time of 40 rain, metallization rate and dezincificafion rate of the pellets are higher than 85% and 95% re spectively after the reduction.