Recovery of zinc and other valuable metals from zinc leach residue by top blowing fuming method

In this paper, comprehensive utilisation of hydrometallurgy zinc residue, goethite especially, was proposed. The raw material used in this study was mixed residue while the mass ratio of goethite and lead–silver residue was fixed at 4∶1. Based on the characters of mixed residue, the top blowing fuming method was taken by using induction furnace. The effects of parameters such as CaO/SiO2 (0·61–0·91), C/feed mass ratio (18–26%) and reduction time (20–60 min) had been studied. Under the optimum conditions (CaO/SiO2 = 0·71; C/feed mass ratio of 24%; reduction time of 50 min), the average fuming efficiency of zinc, lead and sliver in the mixed residue could reach up to 97·2, 98·1 and 82% respectively.