LAUSR

The work addresses the removal effectiveness of F and Cl in the zinc oxide fume produced in fuming furnace, by application of microwave roasting, taking advantage of the difference in microwave absorbing characteristics of halides, lead and zinc oxides in combination with the advantage of selective microwave heating. The effectiveness of defluorination and dechlorination was discussed in detail addressing the effect of all the influencing parameters such as roasting temperature, holding time and stirring speed. SEM and XRD were utilized to understand the removal mechanism of F and Cl. The results show that a nearly 92.8 % defluorination efficiency and 90.3 % dechlorination efficiency could be achieved at roasting temperature of 700 °C, holding time of 80 min and stirring speed at 120 rpm, satisfying the requirements of the wet smelting electrolysis process.