Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of refining method of crude zinc oxide recovered from industrial waste

A technology for industrial waste and crude zinc oxide, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of zinc oxide purity exceeding 95%, complicated purification process, incomplete removal of insoluble compounds, etc.

Active Publication Date: 2018-06-26
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most representative process has always been the method of patent No. P05565354, which uses a wet cleaning method. This method washes crude zinc oxide in an alkaline aqueous solution to remove water-soluble chlorides, but there is a problem with insoluble compounds. The shortcomings of incomplete removal also involve processes such as filtration, drying, roasting and water treatment, resulting in complex purification processes and difficult operations; in addition, the method of dry oxidation roasting using a rotary hearth furnace (patent No. JP306590), the invention puts crude zinc oxide into an oxidation roasting furnace, and by adjusting the concentration of air pressure, water vapor, hydrogen chloride, etc. in the furnace, the impurities in the crude zinc oxide, especially chloride, are volatilized and removed, and the crude zinc oxide is realized. Highly purified, but this method also has many shortcomings, such as the adjustment and standardization of the furnace pressure, water vapor, and hydrogen chloride concentration are very difficult, especially iron oxides cannot be removed well, so the purity of zinc oxide purified by this method is difficult more than 95%

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of refining method of crude zinc oxide recovered from industrial waste
  • A kind of refining method of crude zinc oxide recovered from industrial waste
  • A kind of refining method of crude zinc oxide recovered from industrial waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1, a kind of refining method of the crude zinc oxide that recovers from industrial waste, calculate by mass ratio, with 100 parts of zinc purity be 60.5%, iron content is the crude zinc oxide powder of 0.9% (this crude zinc oxide powder Concrete composition is as shown in table 1) and 15 parts of methanol solutions are poured in the container, stir 10min under 300rmp to make thick zinc oxide slurry, then magnetic separation removes iron-containing impurities in the thick zinc oxide slurry under 3000 gauss magnetic field, Evaporate and remove the methanol solution in the crude zinc oxide slurry after magnetic separation to obtain crude pure zinc oxide powder;

[0028] Take 100 parts of the crude zinc oxide powder, add 8 parts of sodium chloride, and then carry out chlorination and roasting at 500° C. for 30 minutes. After the chlorination and roasting is completed, put the obtained solid into an oxidation furnace and carry out oxidation and roasting at 1200° C....

Embodiment 2

[0029] Example 2, a refining method of crude zinc oxide recovered from industrial waste, calculated by mass ratio, pour 100 parts of zinc oxide powder with a zinc purity of 60.5% and an iron content of 0.9% and 25 parts of ethanol solution Put it into the container, stir at 300rmp for 10min to make a coarse zinc oxide slurry, then remove the iron-containing impurities in the coarse zinc oxide slurry by magnetic separation under a 3000 gauss magnetic field, and evaporate and remove the ethanol solution in the rough zinc oxide slurry after magnetic separation Obtain crude zinc oxide powder;

[0030] Take 100 parts of the crude zinc oxide powder, add 12 parts of potassium chloride and carry out chlorination roasting at 550° C. for 30 minutes. After the chlorination roasting is completed, put the obtained solid into an oxidation furnace and carry out oxidation roasting at 1250° C. for 1 hour. The obtained solid powder is high-purity zinc oxide-sample II. The composition of the sam...

Embodiment 3

[0031] Example 3, a refining method of crude zinc oxide recovered from industrial waste, calculated by mass ratio, pour 100 parts of zinc oxide powder with a zinc purity of 60.5% and an iron content of 0.9% and 20 parts of ethanol solution Put it into the container, stir at 300rmp for 10min to make a coarse zinc oxide slurry, then remove the iron-containing impurities in the coarse zinc oxide slurry by magnetic separation under a 3000 gauss magnetic field, and evaporate and remove the ethanol solution in the rough zinc oxide slurry after magnetic separation Obtain crude zinc oxide powder;

[0032] Take 100 parts of the crude zinc oxide powder and add 10 parts of ammonium chloride, carry out chlorination and roasting at 520° C. for 30 minutes, put the obtained solid into an oxidation furnace after the chlorination and roasting is completed, and carry out oxidation and roasting at 1220° C. for 1 hour. The obtained solid powder is the high-purity zinc oxide-sample III. The compos...

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
magnetic flux densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for refining crude zinc oxide recovered from industrial waste. The method is implemented through the following steps: crude zinc oxide slurry is prepared from crude zinc oxide powder and an alcoholic solution by mixing, iron-containing impurities in the crude zinc oxide slurry are removed through magnetic separation, the alcoholic solution in the crude zinc oxide slurry subjected to magnetic separation is removed by evaporating, crude pure zinc oxide powder is obtained, 8-12 parts by mass of chloride is added to every 100 parts by mass of the crude pure zinc oxide powder, the mixture is subjected to chloridizing roasting, oxidizing roasting is performed after chloridizing roasting, and obtained solid powder is high-purity zinc oxide. By means of magnetic separation for iron removal and addition of a proper amount of chloride, the purity of obtained zinc oxide is as high as 99.9% or higher, 95% of the technical difficulties in the industry of high purification of crude zinc oxide are overcome, a huge effect is realized in the field of recycling of zinc-containing waste, and the current main themes of economic performance and environmental protection are met very well.

Description

technical field [0001] The invention relates to the technical field of resource recovery, in particular to a refining method for crude zinc oxide recovered from industrial waste. Background technique [0002] The various zinc-containing wastes of electric furnace steelmaking dust, after high-temperature reduction and volatilization process, can obtain rough zinc oxide powder with a purity of about 60%. However, most of the crude zinc oxide recovered by the above process has low zinc fineness and contains various chlorides and a large amount of low-temperature volatile impurities, so it is not suitable for direct use as raw materials for zinc refining. Therefore, an additive pretreatment process similar to water washing is needed to improve the stability of the recycling industrialization of zinc-containing waste. [0003] In view of this, many studies on the purification of crude zinc oxide have been carried out in the industry. The most representative process has always b...

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 Patents(China)
IPC IPC(8): C01G9/02
CPCC01G9/02C01P2006/80
Inventor 栗克建尹在宏
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY