Separating and enriching zinc from metallurgical dust at low temperature

The characteristics of dust obtained from different steelmaking enterprises were systematically studied.A new process for separating and enriching zinc from metallurgical dust at low temperature was developed.Based on the volatilized thermodynamics analysis and dynamics reduction experiment of pure ultra-fine ZnO,the experimental study on non-molten reduction and recovery and enrichment of zinc in dusts was carried out.The results show that zinc oxide is reduced to metallic zinc,using high-purity CO or H2 as the reducing agent at 800-900 ℃,and the de-zincing rate is over 99%.The collected gaseous reduction products are washed to get rid of K,Cl and other elements,then the enrichment,called Zn-rich material,is obtained with the content of Zn up to 90%.At the same time,the dusts are reduced at the state of non-molten because of low temperature,and the metallization of Fe in product of solid-state reduction is as high as 90%.Furthermore,the solid-state high-purity iron can be directly separated physically.