Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Purification method and application of secondary zinc oxide

A secondary zinc oxide and purification method technology, applied in the field of metallurgy and chemical industry, can solve the problems of complex sewage treatment, high treatment costs, and lengthy processes, and achieve the effects of smooth process, low cost, and environmental friendliness

Inactive Publication Date: 2019-07-16
徐州市正峰锌业有限公司
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is impossible to effectively remove the fluorine and chlorine impurities with such a high content by using the conventional multi-hearth furnace or rotary kiln heating and roasting method to process zinc oxide powder; the zinc oxide powder is pretreated by alkali washing, and then combined with zinc sulfate leaching solution in wet method The combined method of dechlorination has disadvantages such as lengthy process, large loss of zinc, high treatment cost, and complicated sewage treatment.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for purifying secondary zinc oxide, the specific steps are as follows:

[0020] (1) Add industrial sulfuric acid to the soot containing secondary zinc oxide, the secondary zinc oxide soot and industrial sulfuric acid are mixed with a mixing device, and granulated by a disc granulator; the mass percentage of secondary zinc oxide soot and industrial sulfuric acid is 100% : 10, industrial sulfuric acid is added at one time; the particle size of granulation is 8mm;

[0021] (2) Roasting the particles obtained in step (1) in a rotary kiln at a temperature of 600° C. for 5 hours to finally obtain purified secondary zinc oxide.

[0022] A kind of application of secondary zinc oxide, concrete steps are as follows:

[0023] (1) adding 3 times the volume of electrolyte residue to the purified secondary zinc oxide for leaching, and controlling the leaching end point pH to 3.3 by adding industrial sulfuric acid, leaching for 4 hours, and filtering and separating to obtain...

Embodiment 2

[0027] A method for purifying secondary zinc oxide, the specific steps are as follows:

[0028] (1) Add industrial sulfuric acid to secondary zinc oxide soot, mix the secondary zinc oxide soot and industrial sulfuric acid with a mixing device, and granulate through a disc granulation device; the mass percentage of secondary zinc oxide soot and industrial sulfuric acid is 100:15 , industrial sulfuric acid is added at one time; the particle size of granulation is 11mm;

[0029] (2) Roasting the particles obtained in step (1) in a rotary kiln at a temperature of 700° C. for 4 hours to finally obtain purified secondary zinc oxide.

[0030] A kind of application of secondary zinc oxide, concrete steps are as follows:

[0031] (1) Add 4 times the volume of electrolyte residue to the purified secondary zinc oxide for leaching, and add industrial sulfuric acid to control the pH of the leaching end point to be 3.7, leaching for 4.5 hours, and filter and separate to obtain the leaching...

Embodiment 3

[0035] A method for purifying secondary zinc oxide, the specific steps are as follows:

[0036] (1) Add industrial sulfuric acid to secondary zinc oxide soot, mix the secondary zinc oxide soot and industrial sulfuric acid with a mixing device, and granulate through a disc granulation device; the mass percentage of secondary zinc oxide soot and industrial sulfuric acid is 100:20 , industrial sulfuric acid is added at one time; the particle size of granulation is 15mm;

[0037] (2) Roasting the particles obtained in step (1) in a rotary kiln at a temperature of 800° C. for 3 hours to finally obtain purified secondary zinc oxide.

[0038] A kind of application of secondary zinc oxide, concrete steps are as follows:

[0039] (1) Add 5 times the volume of electrolyte raffinate to the purified secondary zinc oxide for leaching, and add industrial sulfuric acid to control the leaching end point pH to 4.1, leaching for 5 hours, and filtering and separating to obtain the leaching solu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a purification method of secondary zinc oxide. The purification method comprises the following specific steps of adding industrial sulphuric acid in soot containing secondaryzinc oxide, conducting granulating by a granulating device, and roasting particles in a rotary kiln for 3-5h at 600-800 DEG C. The application of secondary zinc oxide comprises the following specificsteps of adding 3-5 times of volume of electrolyte residue into the purified secondary zinc oxide for leaching, controlling the pH of a leaching terminal point at 3.3-4.1 by supplementing industrial sulphuric acid, conducting leaching for 4-5h, and conducting filtering separation to obtain leach liquor; adding hydrogen peroxide and lime milk in the leach liquor, controlling the pH at 5.0 and the temperature at 45-65 DEG C, and maintaining for 1-2h, and conducting filtering; and adding CuOH and Ni(OH)2 in the leach liquor, controlling the pH at 2.5-4.8 and the temperature at 35-50 DEG C, maintaining for 1h, conducting filtering, and thus obtaining pure electrolyte. The purification method has the advantages of unobstructed process, less consumption, low cost, no three wastes and environment-friendly property.

Description

technical field [0001] The invention relates to the technical field of metallurgy and chemical industry, in particular to a method for purifying secondary zinc oxide and its application. Background technique [0002] Zinc oxide powder is obtained by treating solid waste containing zinc (such as iron and steel dust, lead smelting slag, etc.) by high-temperature fuming method, which is a secondary resource for producing zinc metal. There are some impurities in its chemical composition which are very harmful to zinc production by wet method, such as Cl and F. It is impossible to effectively remove the fluorine and chlorine impurities with such a high content by using the conventional multi-hearth furnace or rotary kiln heating and roasting method to process zinc oxide powder; the zinc oxide powder is pretreated by alkali washing, and then combined with zinc sulfate leaching solution in wet method The combined method of dechlorination has disadvantages such as lengthy process, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B1/24C22B1/02C22B19/20C22B19/30C01G9/02
CPCC01G9/02C22B1/02C22B1/2406C22B7/007C22B7/02C22B19/22C22B19/30Y02P10/20
Inventor 李子岩
Owner 徐州市正峰锌业有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products