VALORIZATION

摘要

In a process of recovering metal values from leaching residues of zinc-bearing materials such as the leaching residues of roasted zinc concentrate, comprising subjecting said leaching residues to a subsequent leaching with a solution of dilute sulphuric acid for dissolving the zinc, adding a sulphur-bearing ore to said solution, separating a sulphurous residue from said solution, oxidizing said solution and precipitating the therein contained iron by using an oxidizing agent and adding a neutralizing agent containing zinc oxide.