Study On Comprehensive Utilization Of Zinc-Leaching Residue

Ore from Fankou Lead-Zinc mine is not only abundant in Pb, Zn, Ag and S, but also rich in rare metal resources such as germanium(Ge) and gallium(Ga), so it is worthwhilw to recover these valuable elements. Technological principia, features, present situation and development of processes in of treating zinc-leaching residue were introduced to the point , and on the basis of these information and combination the properties of zinc-leaching residue from Fankou, we advanced a new process of comprehensive recovery valuable elements from zinc-leaching residue. It includes two parts: one is separation valuable elements from residue by the process of reducing roast followed by magnetic separation; another is separation and recovery valuable elements by the process of high acidity leaching and reducing leaching of iron powder followed by solvent extraction.Comprehensive recovery of valuable elements from zinc leaching residues is study by reducing roast followed by magnetic separation. When the tested residue is reduced at 1100℃ for 150min, the volatilization of Zn and recovery of Ga reaches 98.42% and 89.10% respectively. After magnetic separation of the reduced product, a concentrate of concentration and recovery of Fe 90.16% and 87.78%, concentration and recovery of Ga 2164g/t and 92.42% and concentration and recovery of Ge 1300g/t and 90% are obtained respectively. The results show that Ga and Ge occurs mainly in metallic iron in the reduced product, which is the enrichment basis of valuable elements such as Ga and Ge during the process of reducing roast and magnetic separation.Separation and recovery of valuable elements such as Ga, Ge and In by the process of high acidity leaching and reducing leaching of iron powder followed by solvent extraction was also investigated. It shows that at 80℃ with a acidity of 180 g/L the leaching rate of Ga and Ge can reach 96.8% and 68.4%, respectively. Solvent extraction was employed to purify the valuable elements. Ga and Ge were extracted at a pH valueof 1.5 and 1 respectively with a extract agent which was composed of 10% P2o4 and 90% sulfonated kerosene and 1.5%YW-100. the total recovery of Ga and Ge reached 93.3 % and 89.2 %, respectively.