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

A technology for leaching slag and valuable metals from electrolytic zinc, which is applied in the direction of photographic technology, photographic auxiliary technology, instruments, etc., can solve problems such as difficulty in meeting the requirements of concentrate grade, inability to treat waste slag alone, environmental hazards of drainage and slag discharge, etc. Metal recovery rate and work efficiency, saving the number of components, the effect of reducing the harm to the environment by the amount of the chemical

Inactive Publication Date: 2015-04-22
HUAYUAN COUNTY HONGDA BIANCHENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 grad

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

Examples

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Embodiment 1

[0052] A process for extracting valuable metals from electrolytic zinc waste slag in this embodiment comprises the following steps:

[0053] S1 Grinding: First add waste residue and water to the ultrafine grinder at a mass ratio of 2:1, and add sulfuric acid and hydrogen peroxide with a concentration greater than 90%, wherein sulfuric acid and hydrogen peroxide account for 10% and 1% of the total mass of the solution, respectively, At the same time, the ultra-fine grinder is heated to 70°C-90°C, and ground for 30 minutes under normal pressure; since the zinc in the waste residue has been roasted before, it becomes zinc ferrite which is difficult to leach, and cadmium is also difficult to leach, so it is used Mechanical activation can be better leached;

[0054] S2 leaching: put the mixture obtained after grinding into a mixing tank, and add water to the mixing tank until the liquid-solid ratio is 5-8:1, and supplement sulfuric acid and hydrogen peroxide at the same time, so th...

Embodiment 2

[0078] Such as figure 1 and figure 2 As shown, the electrolytic cell used in the recovery process of valuable metals in a kind of electrolytic zinc leaching slag of this embodiment includes a leaching tank 1, the two ends of the leaching tank 1 are cathode regions 2, and the middle part of the leaching tank 1 is an anode Area 3, the anode area 3 is provided with a stirring mechanism 4, the cathode area 2 at both ends and the anode area 3 in the middle are separated by two diaphragms 5, and an anode plate and a cathode plate are respectively arranged inside and outside the diaphragm 5 to form a diaphragm anode 6 and diaphragm cathode 7; two cathode plates and two anode plates are arranged at intervals in the cathode area 2 to form two groups of electrolysis areas 8 without separation, the cathode plate and the anode plate are respectively connected to a power bus, and the cathode plate is connected to the cathode The bus bar 91 and the anode plate are connected to the anode b...

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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...

Claims

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Application Information

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IPC IPC(8): C25C1/18C25C7/00
CPCC25C1/18C25C7/00
Inventor 廖亦农杨永应杨红春刘曼利
Owner HUAYUAN COUNTY HONGDA BIANCHENG TECH
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