| Abstract Scope |
Zinc hypoxide belongs to the secondary resources of the lead, zinc and steel industries, the recovery of valuable metals in zinc hypoxide is of great significance for energy conservation and environmental protection. In this study, NH3-NH3HCO3-H2O leaching system was used to recover metal zinc in zinc hypoxide. The dissolution equilibrium analysis of the leaching shows that zinc in this system exists in the form of zinc-ammonia complex in solution, and the dominant form is [Zn(NH3)4]2+. Orthogonal test result indicates that the most influential factor for zinc leaching rate is nT(NH3)/n(Zn), followed by solid-liquid ratio and leaching time, and [NH4]/[NH3]T has little effect on it. Under the optimum experimental conditions using nT(NH3)/n(Zn)=5:1, [NH4]/[NH3]T=1.2:4, temperature of 30C, leaching time of 30min, liquid/solid ratio of 7mL/g, the leaching rate of zinc can reach up to 79.94%. |