Abstract：Dust and sludge is one of the main solid wastes produced in the process of iron and steel making. If it is directly stacked or discharged, it will inevitably cause environmental pollution, and the valuable elements in the dust and sludge have not been effectively utilized, so its resource utilization has become a serious problem faced by steel plants. Pyrometallurgy method is most widely used in the treatment process of the dust and sludge. Based on the pyrometallurgical treatment process, a new idea of using carbon from biological sludge instead of coal powder and coke powder as reducing agent to reduce zinc-bearing dust from iron and steel plant are put forward. The simulated high temperature reduction experiments were carried out under the conditions of rotary hearth furnace. Three factors,including mass ratio,reaction temperature and reaction time,were selected as the main influencing factors to study the high temperature self-reduction law of iron oxide and zinc oxide in carbon-bearing agglomerates made by dust and sludge(CADS). XRD,SEM,GC/MS and XRF were used to analyze the mineral composition,microstructure,element distribution and chemical composition of CADS before and after the reaction. The results show that the metallization rate and the zinc removal rate of CADS increases with the increase of the mass ratio of biological sludge and reaction temperature. With the extension of reaction time,the metallization rate and zinc removal rate of CADS increased first,and then to be stable after 20 min. When the mass ratio of electric furnace ash to biological sludge is 1∶0.69, the reaction temperature is 1 300 ℃,and the reaction time is 20 min,the metallization rate of CADS can reach 98.48%,and the zinc removal rate of CADS can reach 98.95%. This shows that the recovery of valuable element zinc can be realized by using biological sludge to reduce zinc-bearing dust,and the metallized agglomerates obtained after reduction can be returned to the steel production process,to realize the resource utilization of iron element in dust and sludge from iron and steel plant.
魏汝飞, 张飞虎, 孟东祥, 龙红明, 李家新. 生物污泥还原钢铁厂含锌粉尘规律[J]. 钢铁, 2023, 58(6): 134-142.
WEI Rufei, ZHANG Feihu, MENG Dongxiang, LONG Hongming, LI Jiaxin. Law of zinc-bearing dust from iron and steel plant reduced by biological sludge[J]. Iron and Steel, 2023, 58(6): 134-142.
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