Recycling technology for valuable metals in electrolytic zinc leach residues and electrolytic cell adopted by same

Abstract

The invention provides a recycling technology for valuable metals in electrolytic zinc leach residues. The technology comprises the steps that waste residues, water, sulfuric acid and hydrogen peroxide are added into a superfine grinding mill and then ground to be put into a stirring tank, water is added into the mixing tank, sulfuric acid and hydrogen peroxide are supplied sufficiently, stirring is carried out on the normal pressure condition, an extract is filtered, residues are washed, liquid obtained through filtration is heated and concentrated, solid zinc sulfate is obtained through cooling and filtration, and a zinc sulfate product is obtained through drying; then the liquid is heated, and sponge cadmium is generated after zinc powder is added to obtain a cadmium product; the solid obtained through filtration is placed into an electrolytic cell, a chloride and a catalyst are added, and lead is leached in a cathode region; then waste residues and wastewater are processed. The invention further provides the electrolytic cell adopted by the recycling technology for valuable metals in the electrolytic zinc leach residues. According to the recycling technology, metals of lead, zinc and cadmium can be efficiently recycled, the cost is greatly reduced, and harm to the environment is greatly lowered; The recycling technology has the wide development prospect and can be applicable to electrolytic zinc leach residues accumulated in different regions all the year round and some refractory oxidized ores.

Description

technical field [0001] The invention relates to the technical field of metal recovery, and more specifically, relates to a process for recovering valuable metals in electrolytic zinc leaching slag. The invention also provides an electrolytic cell used in the recovery process. Background technique [0002] The leaching slag of the electrolytic zinc plant is the waste leaching of zinc concentrate after roasting and wet leaching. This waste slag is a high-risk waste slag. The slag contains about 4% of the theoretical amount of zinc, about 5% of the theoretical amount of lead and The theoretical amount of cadmium is about 1%. Among them, cadmium is the most harmful to the environment and has great harm to the environment. In addition, the loss of valuable metals in the waste residue is also a great waste of resources. Therefore, the conversion of this waste residue into non-hazardous residue and recovery of valuable metals has become a major issue, especially today when the coun...

AI Technical Summary

Problems solved by technology

Now there are three kinds of waste residues to deal with: one is to recover valuable metals from zinc electrolysis waste residues by fire method. This method has several disadvantages. Production, and the flue gas produced is very harmful to the environment, and good fire and dust removal equipment is required. The investment in fire method production equipment and dust removal equipment is very large. This method is not a promising method.

Second, the flotation method recovers the valuable metals in the electrolytic zinc waste slag. This method consumes a lot of chemicals, the beneficiation yield is not high, and the concentrate grade is difficult to meet the requirements. The most important thing is that the drainage and slag still cause serious harm to the environment. Secondary pollution

The third is that the recovery of electrolytic zinc leaching slag by wet leaching is a relatively good method. It has a high recovery rate and can easily produce high-grade metal salt products in terms of grade. The disadvantage is that the single wet method currently used The cost of the leaching process is still relatively high. Although the wet leaching of waste residue is a promising development direction, more efforts are needed to research and develop new process methods

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