Combined treatment method for copper smelting soot and polluted acid

Abstract

The invention discloses a combined treatment method for copper smelting soot and polluted acid. The method includes the steps that after the copper smelting soot and the polluted acid are mixed for pulp conditioning, an oxidizing agent is added for controlled-potential oxidization leaching, so that copper, arsenic, zinc and other metal in the copper soot are dissolved to enter leachate, and lead, bismuth and other metal are precipitated to enter a reaching residue; then an oxidizing agent is added into the leachate so that As(III) in the solution can be completely oxidized into As(V); afterwards, sodium sulphide is added, so that the copper in the solution is precipitated in the form of copper sulphide to produce copper concentrate, and a reducing agent is added into the copper-removed solution so that the As(V) in the solution can be completely reduced into As (III); then sodium sulphide is added so that the arsenic in the solution can be precipitated in the form of arsenic sulfide; and finally the arsenic-removed solution is neutralized with alkaline and then is discharged after reaching the standard. By the adoption of the combined treatment method, controlled-potential oxidization leaching, controlled-potential oxidization sulfurization and reduction sulfurization are simultaneously combined to be used for step-by-step separation and recovery of valuable metal in the copper smelting soot and polluted acid, and therefore waste in the system can be recycled, and the purpose of using waste to treat waste is achieved.

Description

technical field [0001] The invention relates to a hydrometallurgical process in the field of nonferrous metallurgy, in particular to a hydrometallurgical method for separating and recovering valuable metals in copper smelting soot and sewage acid by using a combination of controlled potential oxidation leaching and controlled potential oxidation vulcanization and reduction vulcanization. Background technique [0002] Copper is a rose-red heavy non-ferrous metal. Its excellent physical and chemical properties are widely used in various fields such as electrical, national defense, light industry, machinery manufacturing and construction. It is second only to aluminum in the consumption of non-ferrous metal materials in my country. . At present, the general use ratio of copper is as follows: 48-49% in the electrical industry, 19-20% in the communication industry, 14-16% in construction, 7-10% in transportation, and 7-9% in home appliances and others. In 2014, the output of ten ...

AI Technical Summary

Problems solved by technology

There are two common problems in these sewage acid treatment processes: one is that the sewage acid treatment causes a large amount of heavy metals to precipitate into the gypsum slag, which increases the difficulty of waste slag stacking and treatment

The second is to make the valuable metals in the dirty acid enter the waste residue, resulting in a waste of valuable metals, and at the same time, the removal of valuable metals is not complete

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