Microwave synergistic treatment of blast furnace ash and converter ash to extract valuable components of zinc and iron

In order to maximize the economic value of blast furnace ash and converter ash and improve the utilization rate of metallurgical solid waste resources, blast furnace ash and converter ash are used as raw materials, and the microwave method is used to reduce valuable elements such as Zn and Fe in blast furnace ash and converter ash. Its recycling. This method uses the characteristics of uniform thermal diffusion and fast heating rate of microwave to greatly reduce the reaction time. At the same time, it also makes full use of the C in the dust to carry out the self-reduction reaction without external preparation. The orthogonal experiment is used to explore the influence of different factors on the dezincification rate and find the optimal conditions for reducing Zn and Fe; after the Zn extraction is completed, the magnetic separation method is used to extract Fe from the reduced slag. The results show that: when the ratio of blast furnace ash to converter ash is 7:3, the reduction temperature range is 950~1 100℃, and the C in the mixed ash can completely reduce Zn and Fe; the orthogonal experiment shows that the factor of Zn removal rate ranges from large to the minor sequence is reduction temperature, reduction time, material layer height, and moisture; the optimal process conditions for Zn removal: reduction temperature 1 100℃, reduction time 40min, material layer height 0.5 cm, moisture 10%, and the Zn removal rate is 99.37%; Fe recovery rate of the reduced slag after magnetic separation can reach 92.04%, which can be used as iron concentrate to return to the ironmaking process.