Study on the separation of zinc and iron in electric arc furnace baghouse dusts and its kinetics

Abstract

In order to utilize the zinc–iron resources rich in the bag ash of a steel mill’s electric furnace, the reaction rate and degree of zinc ferrite in the solid–solid reduction reaction are analyzed from the kinetic point of view, and the electric furnace bag is treated by the carbon-containing pellet reduction roasting method. Ash, the effect of zinc–iron separation during the reduction process, and the comprehensive utilization method of product greening were studied. The results show that in the process of reduction of zinc and iron in the bag ash of electric furnace, the weight loss rate and dezincification rate are positively correlated with the increase of reduction temperature and reduction time within a certain range. Under the condition of not considering the metallization rate, the reduction temperature of 1300 °C was determined, and the reduction rate of zinc in the electric bag ash was 98% when the reduction time was 15 min. The research on the kinetics of reductive dezincification shows that under certain process conditions, the ratio of decarburization with fixed carbon proportions is relatively fast. At this time, the dezincification rate can reach more than 90%, and the zinc removal rate is 98%.