Abstract:In order to improve the pelletizing performance of zinc-containing dust in steel mills and produce carbon-burdened pellets in high-strength zinc-containing dust, a pre-wetting-pelletizing process for zinc-containing dust is developed. In this paper, the test of the process parameter optimization for the production of carbon-burdened pellets in zinc-containing dust is carried out, the temperature change of dust during wetting and the influence of wetting on the physical and chemical properties of dust including chemical composition and contact angle are explored, and the effects of wetting conditions, pelletizing moisture, pelletizing time and binder dosage on the compressive strength and bursting temperature of fresh pellet and dry bulbs are investigated. The results show that under the optimal process parameters, the fresh pellet falls with a falling strength of 19.1 times/(0.5 m), a compressive strength of 78 N/P, a bursting temperature of 518 °C, and dry pellet falls with a falling strength of 19.6 times/(1 m) and a compressive strength of 155 N/P. Subsequently, under the conditions of reduction temperature of 1,200 °C and reduction time of 50 min, the carbon-burdened dry pellets in the zinc-containing dust are directly reduced, and finally the reducing pellets with an iron grade of 73.6%, an iron metallization rate of 90.7% , a compressive strength of 1 164 N/P and a residual zinc mass fraction of only 0.07% could be produced, which could be directly used as raw materials for blast furnaces.