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Method for oxidization pretreatment of zinc-containing secondary materials

A pretreatment and material technology, applied in the field of hydrometallurgy, can solve the problems of poor removal effect, complicated purification process, easy introduction of impurity ions, etc., and achieve the effect of improving removal effect, high purity, and shortening purification process steps.

Active Publication Date: 2018-11-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a method for combined oxidation pretreatment of zinc-containing secondary materials with dual oxidants to solve the problem of poor removal effect and easy introduction of impurity elements in existing wet methods for removing impurity elements in zinc-containing secondary materials. Impurity ions, complex follow-up purification processes, etc.

Method used

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  • Method for oxidization pretreatment of zinc-containing secondary materials
  • Method for oxidization pretreatment of zinc-containing secondary materials
  • Method for oxidization pretreatment of zinc-containing secondary materials

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Take 25g of secondary zinc oxide for oxidation pretreatment, and select the molar concentration ratio of the double oxidant hydrogen peroxide and potassium persulfate to be 0, 3:6, 3:7, and 3:8, respectively. The ratio of the concentration of oxidant to the concentration of ferrous iron and manganese in secondary zinc oxide is 11. The reaction temperature was 60°C, the pretreatment time was 120min, and the natural pH of the reaction system was 6-7. After the pretreatment, the filter cake was filtered and dried at 90°C for 5 hours to obtain four groups of pretreated samples.

[0037] The pretreated samples of each group were soaked in ammonia at 30°C for 1 hour, and the zinc-ammonia leaching solution was obtained by filtration, and the content of iron, manganese, cadmium, and lead metal impurity elements in the leaching solution of each group was detected. The results are shown in Table 1:

[0038] Comparing the data of each group in Table 1, it can be seen that when th...

Embodiment 2

[0042] Get 25g secondary zinc oxide and carry out oxidative pretreatment, select the molar concentration ratio of hydrogen peroxide and potassium persulfate to be 3:7, get the concentration ratio of oxidant concentration and ferrous iron in secondary zinc oxide, the concentration ratio of manganese element to be 9,10 respectively, 10.5, 11, 12, with other steps unchanged, detect the content of iron, manganese, cadmium, and lead metal impurity elements in each group of leaching solutions, and the results are shown in Table 2:

[0043] Table 2 Contents of metal impurity elements in leachate

[0044]

[0045] It can be seen from Table 2 that when the ratio of the concentration of oxidant to the concentration of ferrous iron and manganese in secondary zinc oxide increases to 11, there is no iron and manganese in the leaching solution, and the concentrations of cadmium and lead are relatively low. smaller.

Embodiment 3

[0047] Get 25g secondary zinc oxide and carry out oxidative pretreatment, select the molar concentration ratio of hydrogen peroxide and potassium persulfate to be 3:7, the concentration ratio of oxidant concentration and secondary zinc oxide, ferrous iron, manganese element concentration ratio is 11, pretreatment temperature respectively Select 50°C, 60°C, and 70°C, and keep the other steps unchanged, and detect the content of iron, manganese, cadmium, and lead metal impurity elements in the leaching solutions of each group. The results are shown in Table 3:

[0048] It can be seen from Table 3 that when the pretreatment temperature increases to 60°C, the content of iron and manganese elements in the leaching solution is 0, and there is no iron and manganese elements in the leaching solution.

[0049] Table 3 Content of metal impurity elements in leachate

[0050]

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Abstract

The invention discloses a method for oxidization pretreatment of zinc-containing secondary materials. The method comprises the following steps of before impregnating the zinc-containing secondary material by ammonia, adding at least two types of oxidants into the zinc-containing secondary material to perform oxidation pretreatment reaction; after reaction is finished, filtering, so as to obtain the pretreated zinc-containing secondary material, wherein at least two oxidants comprise hydrogen peroxide and persulfate. The method has the advantages that the impurity element removal effect is good, the other impurity ions are not introduced, the zinc loss is less, and the subsequent purifying steps are greatly simplified; the problems of poor removal effect, easiness in introducing of impurityions, and complicated subsequent purifying technology in the existing wet type impurity element removal method of the zinc-containing secondary materials are solved.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for pretreating zinc-containing secondary materials by combined oxidation with multiple oxidants. Background technique [0002] Zinc is one of the metals with a high recycling rate in the world. Secondary zinc resources have become an important part of zinc production raw materials. According to the statistics of the US Zinc Trading Company, 30% of the world's zinc comes from recycled zinc resources. The use of secondary zinc resources to prepare active zinc oxide has become the focus of people's increasing attention, which has economic value and social benefits. Secondary zinc oxide is a common secondary zinc resource. Secondary zinc oxide powder contains impurity elements such as manganese, iron, cadmium, and lead. During the leaching process, some of these impurity elements will enter the solution, affecting the leaching of zinc, increasing the Subsequent pur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/30C22B19/20C22B3/44C22B3/14
CPCC22B19/24C22B19/26C22B19/30Y02P10/20
Inventor 杨永斌李骞徐斌姜涛苏欢欢钟强郭宇峰范晓慧李光辉陈许玲张元波曾艳
Owner CENT SOUTH UNIV
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