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A process and device for multi-stage countercurrent continuous rinsing and dechlorination of zinc oxide fumes

A zinc oxide, smoke and dust technology, applied in the field of hydrometallurgy, to achieve the effect of short process flow, elimination of hazards, and improvement of use value

Active Publication Date: 2018-08-10
江西自立环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Based on the above problems, we propose a green and environmentally friendly zinc oxide with short process flow, strong operability, no industrial wastewater discharge and no hazardous waste residue, which is widely applicable to various chlorine-rich zinc oxides encountered in the zinc hydrometallurgy process. The method of flue dust rinsing and dechlorination solves the problem of opening and removing water-soluble chloride, solves the technical problems related to the industrialization of the process of recovering and producing electrolytic copper and electrolytic zinc from smelting soot, and improves the adaptability of the process to raw materials. Diversification, and the feasibility of raw materials suitable for the technical requirements of the process; thus providing a process and device for multi-stage countercurrent continuous rinsing and dechlorination of zinc oxide fumes

Method used

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  • A process and device for multi-stage countercurrent continuous rinsing and dechlorination of zinc oxide fumes
  • A process and device for multi-stage countercurrent continuous rinsing and dechlorination of zinc oxide fumes

Examples

Experimental program
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Effect test

Embodiment 1

[0041] 1. Multi-stage countercurrent continuous rinsing and dechlorination device for zinc oxide smoke and dust:

[0042] It includes three rinsing tanks arranged side by side, three filter presses and connecting pipes arranged in dislocation above them; the bottom and one side of the three rinsing tanks are respectively equipped with a slurry outlet, and the top is respectively equipped with a material inlet and a filtrate inlet. Each filter press is equipped with a slurry inlet, a filtrate outlet, and a slag outlet; the three rinsing tanks are the first-stage agitated rinsing tank 1, the second-stage agitated rinsing tank 2, and the third-stage agitated rinsing tank 3. The filter is the first-stage filter press 4, the second-stage filter press 5 and the third-stage filter press 6; filtrate control valves are installed at the filtrate inlets of the three rinsing tanks and the filtrate outlets of the three filter presses. valve. The filtrate control valves include a second fi...

Embodiment 2

[0072] Embodiment 2: The three-stage countercurrent continuous rinsing dechlorination device of zinc oxide smoke dust and the dechlorination process are the same as in Example 1, according tofigure 1 The process shown is carried out.

[0073] The chemical composition of a typical ZnO fume is shown in Table 1. The rinse solution is fresh water.

[0074] 1. Rinse

[0075] According to the zinc oxide dust shown in Table 1, three-stage countercurrent process equipment was used to continuously rinse the water-soluble chloride. Rinse pool 30m 3 , filter press 80m 2 , 3 units each, and the rinse solution is new water.

[0076] 10m of rinsing solution of this level is returned to the first level rinsing pool 3 , and then return to the second stage rinse solution 10m 3 . Add 5t of zinc oxide dust in Table 1, mechanically stir at room temperature, 60 rpm; filter and separate the pulp with a filter press, and discharge 7.5m from the filtrate 3 The rinsing liquid is stored as the ...

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Abstract

The invention discloses a multi-level countercurrent continuous rinsing and chlorine removing technology and device for zinc oxide smoke. Raw materials are chlorine containing zinc oxide smoke. The technology comprises the steps that neutralizing, rinsing and purifying are carried out; free acid in zinc extraction residual liquid of an extraction-electrodeposition method is neutralized through limestone flour; zinc oxide smoke rich in chlorine is rinsed through neutralized liquid; and zinc ions are deposited through slaked lime powder via rinsed liquid, zinc oxide residues subjected to chlorine removing are rinsed, and the chlorine residues are removed. According to the technology and device, reverse circulation of solid materials and liquid materials is achieved, a water-soluble compound in the solid materials can be deeply removed, and the problem of removing of a water-soluble chlorine fluorine compound in the zinc oxide smoke raw materials during zinc hydrometallurgy is solved. Meanwhile, the technology and device are suitable for rinsing and recycling of soluble valuable metal salt in various hydrometallurgy residues, and material balance, size balance and concentration balance in a multi-level countercurrent rinsing device system can be guaranteed; and it can also be guaranteed that chemical components of generated rinsed residues and the rinsed liquid are stable, and linkage with a next procedure is facilitated.

Description

technical field [0001] The invention belongs to the technical field of wet smelting, and relates to a process and device for multi-stage countercurrent continuous rinsing and dechlorination of zinc oxide smoke and dust. Background technique [0002] Industrial zinc oxide dust is a dangerous solid waste, which is rich in chlorine and heavy metals such as zinc, cadmium, lead, tin, etc., and is a secondary renewable resource of various valuable metals. At present, zinc oxide dust rich in chloride plays an important role in zinc hydrometallurgy. [0003] About 80% of the total production of zinc metal in the world is produced by wet method, how to eliminate a certain amount of chloride ion is a very important problem in hydrometallurgy zinc. The impact of increased chlorine content is mainly reflected in the rapid rise in the consumption of zinc cathodes, which increases the cost of electrolytic production. Therefore, before electrolysis, it is necessary to perform fluorine re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/00C22B19/30C22B7/02
CPCC22B1/005C22B7/02C22B19/30Y02P10/20
Inventor 宁建平路永锁程进辰
Owner 江西自立环保科技有限公司
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