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Method for removing impurities by oxidation in process of zinc hydrometallurgy

A technology of hydrometallurgy and secondary zinc oxide, which is applied in the direction of improving process efficiency, etc., can solve the problems of electro-zinc impurity removal and high product quality, and achieve smooth production, high product quality and cost reduction

Inactive Publication Date: 2010-05-26
孙位成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention well solves the problem of removing impurities in the production of zinc oxide as a raw material, especially the removal of As, Sb, Ge, F, and Fe, so that the production of zinc oxide is smooth and the product quality is high

Method used

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  • Method for removing impurities by oxidation in process of zinc hydrometallurgy
  • Method for removing impurities by oxidation in process of zinc hydrometallurgy
  • Method for removing impurities by oxidation in process of zinc hydrometallurgy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Pumped 40m in the sub-zinc oxide leach tank 3 Electrolytic waste solution (see Table 1 for composition), drop into 10 tons of zinc oxide (see Table 2 for composition), stir for 50min, until the pH is 4.0, add H2O with a mass percentage of 27.5% 2 o 2 Solution 270kg, make the Fe in the solution 2+ <1g / L, then add 150kg of lime to adjust the pH to 5.2, stir for 60min;

[0023] Table 1

[0024] Element

Zn

h 2 SO 4

Fe

As

Sb

Ge

co

Cu

Cd

F

content,

g / L

38

150

0.015

0.00006

0.00006

0.00007

0.0008

0.0003

0.002

0.15

[0025] Table 2

[0026]

[0027] table 3

[0028] Element

Zn

Fe

As

Sb

Ge

co

Cu

Cd

F

Content, g / L

132

0.6

0.0003

0.0004

0.0003

0.005

0.025

0.21

0.18

[0029] Pump the filtered leaching solutio...

Embodiment 2

[0039] Pumped 39m in the sub-zinc oxide leach tank 3 Electrolyzed waste solution (see Table 7 for composition), drop into 10 tons of zinc oxide (see Table 8 for composition), stir for 50min, until pH is 4.5, adding mass percent is 27.5% H 2 o 2 Solution 300kg, make the Fe in the solution 2+ <1g / L, then add 120kg of lime to adjust the pH to 5.2, stir for 60min;

[0040] Table 7

[0041] Element

Zn

h 2 SO 4

Fe

As

Sb

Ge

co

Cu

Cd

F

Content, g / L

42

149

0.016

0.00007

0.00005

0.00006

0.0009

0.0002

0.001

0.13

[0042] Table 8

[0043]

[0044] Table 9

[0045] Element

Zn

Fe

As

Sb

Ge

co

Cu

Cd

F

Content, g / L

136

0.8

0.0002

0.0003

0.0002

0.005

0.029

0.21

0.16

[0046] Pump the filtered leaching solution into the deep iron removal reaction tank, maintain the te...

Embodiment 3

[0056] Pumped 43m in the sub-zinc oxide leach tank 3 Electrolyzed waste liquid (composition sees Table 13), drops into 11 tons of zinc oxide (composition sees Table 14), stirs 50min, until pH is 3.5, adding mass percentage is 27.5% H 2 o 2 Solution 270kg, make the Fe in the solution 2+ <1g / L, then add 200kg of lime to adjust the pH to 5.0, stir for 60min;

[0057] Table 13

[0058] Element

Zn

h 2 SO 4

Fe

As

Sb

Ge

co

Cu

Cd

F

content,

g / L

38

149

0.015

0.00007

0.00005

0.00006

0.001

0.0001

0.001

0.15

[0059] Table 14

[0060]

[0061] Table 15

[0062]

Element

Zn

Fe

As

Sb

Ge

co

Cu

Cd

F

Content, g / L

131

0.7

0.0002

0.0004

0.0003

0.007

0.023

0.22

0.15

[0063] P...

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Abstract

A method for removing impurities by oxidation in the process of zinc hydrometallurgy with sub-zinc oxide high in iron content as the raw material specifically comprises the following five procedures: A. primary impurity removal during leaching of sub-zinc oxide; B. deep impurity removal of ZnSO4 solution; C. first-stage purification of ZnSO4 solution; D. second-stage purification of ZnSO4 solution; and E. filtration to finally obtain the ZnSO4 solution in accordance with the requirement for producing zinc by electrolysis. The method better solves the problem of impurity removal in the process of producing electrolytic zinc with sub-zinc oxide as the raw material, especially the removal of As, Sb, Ge, F and Fe, and ensures the electrolytic zinc to be produced smoothly and ensures high product quality. In the method, the industrial grade H2O2 is used as the oxidant to remove the impurities from the leachate of zinc oxide and can not bring in the impurities harmful to the electrolytic zinc, thus ensuring smooth production, improving the product quality and the production yield and lowering the cost, in addition, the industrial grade H2O2 is relatively cheap and easy to purchase, thus the method is suitable for popularization and application in large scale.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy in the field of nonferrous metal metallurgy, and specifically relates to a method for oxidizing and removing iron and other impurities in the process of hydrometallurgy using secondary zinc oxide with high iron content as a raw material. Background technique [0002] The production methods of metal zinc are divided into fire method and wet method. The fire method is also called dry zinc smelting, that is, putting zinc ore and additives into a furnace and heating to a high temperature, and the metal zinc is reduced and melted into a liquid. In this way, crude metallic zinc is separated and further refined into metallic zinc with higher purity. Zinc hydrometallurgy is to use acid, alkali, salt and other solutions to extract zinc components from ores, and then electrolyze the zinc-containing solution to produce metallic zinc. Zinc hydrometallurgy has the following advantages: strong applicability to l...

Claims

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Application Information

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IPC IPC(8): C22B19/00C22B3/08C22B3/46
CPCY02P10/20
Inventor 孙位成
Owner 孙位成
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