氧化锌烟尘中铟的挥发富集

摘要

On the basis of zinc oxide fly ash bearing multiple valuable metals,thermodynamic equilibrium calculations, laboratory-scale rotary furnace volatilized experiments and pilot test concerning the volatilization of the metals Pb, Zn, In and Cd were carried out, which verified the processing route at the zinc oxide fly ash by selective volatilization of In, Cd and Pb to yield a high-In volatilized product and a high-Zn and removal fluorine and chlorine roasted product. In the laboratory-scale rotary furnace experiments, the volatilization rates of In and Pb are 93.20%and 95.12%, respectively, and the roasted product contains Zn 67.36%, F 0.013%and Cl 0.407%. In the pilot test, the volatilized product contains In more than 700 g/t, which enriches more than two times comparing with the fly ash, the volatilization rate of Pb is 98.94%, and the roasted product contains Zn 64.16%, F 0.013%and Cl 0.211%. The route have a prominent effect on separation In from zinc oxide fly ash, and the roasted product can completely meet the requirements of electrolytic zinc route.%针对含多种有价金属的还原挥发氧化锌烟尘，对各元素的挥发特性进行热力学平衡计算、实验室回转窑挥发和中试试验，验证铟镉铅选择性挥发效果，获得高铟物料和脱除氟氯的高锌焙砂的工艺路线。在实验室回转窑中，铟和铅的挥发率分别为93.20%和95.12%，同时，得到含锌67.36%、含氟0.013%和氯0.407%的焙砂。在中试试验中，挥发产物中铟的平均含量超过700g/t，较原料富集比超过2倍，铅的平均挥发率达到98.94%，焙砂中平均锌含量为64.16%，锌焙砂中氟和氯的含量分别降到了0.013%和0.211%，这说明从氧化锌烟尘中分离铟并获得可以满足电解锌要求的焙砂的挥发效果非常显著。