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A novel process for the treatment of zinc sulfide ores is discussed in this paper, which consists of two procedures: microwave roasting pretreatment and synergistic chelation. What’s more, the reaction mechanism also has been studied. By comparing XRD patterns before and after roasting, it can be concluded that microwave truly alleviates the reaction energy, and adding Na 2 O 2  avoids the emission of SO 2 . % recovery of zinc can reaches 72.47 % on conditions of adding Na 2 O 2  25 %, microwave activating temperature 500 °C, holding time 10 min, leaching temperature 40 °C, ultrasonic wave power 1,800 W, leaching time 4.5 h and solid to liquid ratio 10:1 in ammonium chloride solution whose total ammonium concentrate is 7.5 mol/L (c(NH 3 ) T =7.5 mol/L). The molar ratio of NH 4 Cl and NH 3 ·H 2 O is 1:1 (c(NH 4 Cl): c(NH 3 ·H 2 O)=1:1). The effect of ultrasonic wave power in this process is to shorten reaction time.

The Enhancing Effect of Microwave Irradiation and Ultrasonic Wave on the Recovery of Zinc Sulfide Ores