Process for purifying zinc from casting zinc residue

A zinc slag and process technology, which is applied in the field of non-ferrous metal recovery, can solve the problems of many types of impurity metal ions, large acid consumption in the leaching section, and high energy consumption in electrowinning, and achieve low labor intensity, reduced investment costs, and high purity. Effect

Inactive Publication Date: 2007-10-17
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are obvious deficiencies in this system: For example, there are many types and high content of impurity metal ions in the leaching solution, which leads to heavy purification burden and complicated process
If the traditional sulfuric acid system hydrometallurgy process is adopted, the leaching section will consume a large amount of acid, and the energy consumption of electrowinning is too high, which is not economically feasible

Method used

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  • Process for purifying zinc from casting zinc residue
  • Process for purifying zinc from casting zinc residue
  • Process for purifying zinc from casting zinc residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The energy spectrum (EDS) analysis of the composition of the molten zinc slag is shown in Figure 1. It can be seen that the impurities in zinc slag are mainly aluminum, iron, oxygen, silicon, and calcium. The specific content is shown in Table 1. The content of impurities is not high, especially the content of iron, which has the most significant impact on melting and casting. Heat the zinc slag to 600°C in a reducing atmosphere, and cast it directly into an anode plate. The size of the mold is 6cm×5cm×1cm (length×width×thickness).

[0027] Impurity name

Content (wt%)

aluminum

iron

oxygen

calcium

silicon

4.34

1.39

2.08

0.69

0.38

[0028] The zinc plate melted and cast with the above-mentioned fused and cast zinc slag prepared above is used as the anode plate, the cathode plate is made of pure aluminum plate, and the specification is 5cm×5cm×1cm (length×width×thickness), and the con...

Embodiment 2

[0031] The electrolysis parameters are electrolysis temperature 30°C, homopolar spacing 12cm, current density 600A / m 2 , electrolysis for 24 hours, no need to stir during electrolysis. Others are the same as embodiment 1.

[0032] The current efficiency of the electrolysis process is 98.6%, and the obtained cathode zinc is compact and bright, but the phenomenon of dendritic growth on the cathode plate is relatively serious. The results of energy spectrum analysis are shown in Figure 3, and the composition is shown in Table 3. It can be seen that compared with the analysis results of cathode zinc obtained in Example 1, there is not much change.

[0033] Figure 4 is the XRD analysis result of the cathode zinc product. It can be seen that the characteristic peaks of each angle in the figure are almost all characteristic peaks of zinc element. On the one hand, it shows that the cathode zinc product has a high purity; on the other hand, it shows that zinc is on the cathode plate ...

Embodiment 3

[0036] The electrolysis parameters are electrolysis temperature 30°C, homopolar spacing 12cm, current density 400A / m 2 , electrolysis for 24 hours, no need to stir in the electrolysis process, other conditions are the same as in Example 1.

[0037] The current efficiency of the electrolysis process is 99.3%, the obtained cathode zinc is dense and bright, and there are slight nodules growing on the cathode plate. The results of energy spectrum analysis are shown in Figure 5, and the composition is shown in Table 4. It can be seen that compared with the analysis results of cathode zinc obtained in Example 1, there is not much change.

[0038] element name

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PUM

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Abstract

The present invention relates to reclaiming of non-ferro metals, especially to a process for extracting high-purity Zn from casting zincilates. The casting zincilates are casted into anode sheets, pure aluminum plates are selected as cathodes, and then they are electrolyzed in electrolysing solution to obtain zincium of high-purity at the cathode plates finally, wherein per litre of said electrolysing solution contains 1-3 mol ammine, 1-3 mol ammonium chloride, 0.075-0.3 g additive agent and 40-60 g zincium ions therein, in which said additive agent in per litre electrolysing solution is a mixture composed of 0.05-0.2 g gelatine and 0.025-0.1 g sodium dodecylbenzene sulfonate. By casting the casting zincilates directly into anode sheets and adopting Zn-NH3-NH4Cl-H2O system for performing electrorefining to prepare high-purity zincium, the process is greatly shortened, the energy consumption is saved, and the cost of investment is depressed. The obtained cathode zincium has a high purity (>=99.9%) and is easy to peel off, with low intensity of labor and reduced attrition of cathode plates. The electrolysing solution my be circle-utilized, without pollutions to the environment.

Description

(1) Technical field [0001] The invention relates to the recovery of non-ferrous metals, in particular to the process of extracting high-purity zinc from smelting and casting zinc slag. (2) Background technology [0002] Zinc is an important non-ferrous metal, widely used in electroplating, hot-dipping of steel, and zinc-manganese dry battery raw materials. A large amount of zinc dross is generated during the production and processing of zinc. With the continuous reduction of mineral resources and the requirements of environmental protection, it is very important to recover metal zinc from zinc slag. [0003] At present, 80% of the world's zinc production is hydrometallurgical process using sulfuric acid system. There are obvious deficiencies in this system: For example, there are many types and high content of impurity metal ions in the leaching solution, which leads to heavy purification burden and complicated process. The energy consumption in the electrowinning stage i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/16
CPCY02P10/20
Inventor 郑华均顾正海
Owner ZHEJIANG UNIV OF TECH
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