Preparation of Metallization Pellets with BF Gas Dust and Converter Sludge
高炉瓦斯灰和转炉污泥造块制备金属化球团

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.