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

Physico-chemical properties including chemical composition,particle size distribution and phase of BF dust,dust collected by bag-type collector and converter sludge were analyzed.The feasibility for dezincification by reduction was validated by thermodynamic software Factsage and the initial temperature for the reduction was obtained by TG-DSC experiment.Furthermore,the effect of reduction atmosphere,temperature,time and C/O ratio on the metallization and dezincification rate of the above-mentioned dusts and sludge were investigated.Results show that dust pellets can be reduced in weak oxidization atmosphere,and the dezincification rate and metallization rate of the dust pellets increase with the increase of temperature and time.With C/O ratio of 1.1,reduction temperature of 1 300℃ and reduction time of 40 min,metallization rate and dezincification rate of the pellets are higher than 85% and 95% respectively after the reduction.