CN111020216A - Method for preparing zinc oxide by leaching secondary zinc oxide - Google Patents
Method for preparing zinc oxide by leaching secondary zinc oxide Download PDFInfo
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- CN111020216A CN111020216A CN201911230942.8A CN201911230942A CN111020216A CN 111020216 A CN111020216 A CN 111020216A CN 201911230942 A CN201911230942 A CN 201911230942A CN 111020216 A CN111020216 A CN 111020216A
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- zinc oxide
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/34—Obtaining zinc oxide
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Abstract
A method for preparing zinc oxide by leaching secondary zinc oxide comprises the following steps: adding water into secondary zinc oxide powder, mixing and granulating; feeding the secondary zinc oxide particles into a roasting kiln to roast for 2-3h at the kiln temperature of 300-500 ℃; cooling, and using ammonia water as leaching agent, wherein the liquid-solid volume mass ratio is 5-8: 1; the leaching temperature is 40-50 ℃; leaching for 1-3 h, and filtering; adding hydrogen peroxide into the filtrate, maintaining the temperature at 45-65 deg.C for 0.5-1h, and filtering; heating the filtrate to 80-100 ℃ under 0.02-0.05 MPa until the liquid is completely volatilized; stirring and washing the product for 3-5 times; aging and drying the washed product; and crushing the dried product, then placing the crushed product into a calcining kiln, calcining the crushed product for 2 to 3 hours at the temperature of 600-700 ℃, and cooling the calcined product to obtain the zinc oxide. The invention has the advantages of obvious social environmental protection benefit, simple process, low cost and low energy consumption.
Description
Technical Field
The invention relates to the technical field of fine chemical engineering, in particular to a method for preparing zinc oxide by leaching secondary zinc oxide.
Background
The zinc oxide is an important inorganic chemical product, has very wide application, and is mainly applied to the aspects of rubber, paint, ceramics, glass, medicine, chemical industry, food and the like.
At present, patents and technologies related to the production of active zinc oxide from a secondary zinc oxide raw material are relatively short and weak, how to effectively utilize secondary zinc oxide resources with high impurities and low grade, and exert the economic efficiency to the maximum extent, so that the method provides high-quality and low-cost qualified products for the market and industry and becomes the target of research and development of related technical personnel.
Disclosure of Invention
The invention aims to overcome the defects and provide the method for preparing the zinc oxide by leaching the secondary zinc oxide, which can reduce the cost and has good effect.
The technical scheme of the invention is as follows:
a method for preparing zinc oxide by leaching secondary zinc oxide comprises the following steps:
(1) adding water into secondary zinc oxide powder, mixing, and granulating by a granulating device;
(2) feeding the secondary zinc oxide particles into a roasting kiln to roast for 2-3h at the kiln temperature of 300-500 ℃;
(3) cooling the secondary zinc oxide particles, and then adding a leaching agent ammonia water to obtain a leaching solution, wherein the liquid-solid volume mass ratio is (5-8) to 1; the leaching temperature is 40-50 ℃; leaching for 1-3 h, and filtering;
(4) adding hydrogen peroxide into the filtrate, maintaining the temperature at 45-65 deg.C for 0.5-1h, and filtering;
(5) heating the filtrate to 80-100 ℃ under 0.02-0.05 MPa until the liquid is completely volatilized;
(6) stirring and washing the product obtained in the step (5) for 3-5 times by using deionized water, wherein the volume ratio of liquid to solid is 2-3: 1;
(7) aging and drying the washed product;
(8) and crushing the dried product, then placing the crushed product into a calcining kiln, calcining the crushed product for 2 to 3 hours at the temperature of 600-700 ℃, and cooling the calcined product to obtain the zinc oxide.
Preferably, in the step (1), water is added into the zinc hypoxide powder by using a mixing device and the mixture is uniformly mixed, wherein the mass percentage of the zinc hypoxide powder to the added water is 100: (8-10), adding water at one time.
Preferably, in the step (1), the granulating device is a disc-type granulating device, and the granularity of the granules of the secondary zinc oxide powder is 8-15 mm.
Preferably, in the step (6), the single washing time of the deionized water is 15-20 min.
Preferably, in the step (7), the aging time is 50-70 min.
Preferably, in the step (7), the drying temperature is 100-.
Preferably, in the step (8), the pulverized particle size is 45 to 53 μm.
The method for preparing zinc oxide by leaching secondary zinc oxide provided by the invention has the advantages of low cost and good effect, and can be suitable for large-scale production.
Detailed Description
The following examples are intended to further illustrate the present disclosure, but not to limit the scope of the claims.
Example 1
A method for preparing zinc oxide by leaching secondary zinc oxide comprises the following steps:
(1) adding water into a secondary zinc oxide powder mixing device for mixing, and granulating through a disc type granulating device; the mass percentage of the zinc oxide powder to the added water is 100: 8, adding water at one time; the granularity of the secondary zinc oxide powder particles is 8 mm;
(2) feeding the secondary zinc oxide particles into a roasting kiln to roast for 3 hours at the kiln temperature of 300 ℃;
(3) cooling the secondary zinc oxide particles, and then adding a leaching agent ammonia water to obtain a leaching solution, wherein the liquid-solid volume mass ratio is 5: 1; the leaching temperature is 40 ℃; leaching for 3h, and filtering;
(4) adding hydrogen peroxide into the filtrate, maintaining the temperature at 45 ℃ for 1h, and filtering;
(5) heating the filtrate to 80 deg.C under 0.02MPa until the liquid is completely volatilized;
(6) stirring and washing the product obtained in the step (5) for 3 times by using deionized water, wherein the liquid-solid volume ratio is 2: 1; the single washing time of the deionized water is 20 min;
(7) aging and drying the washed product; aging for 50 min; the drying temperature is 100 ℃, and the drying time is 2 h;
(8) crushing the dried product, putting the crushed product into a calcining kiln, calcining the crushed product for 3 hours at the temperature of 600 ℃, and cooling the calcined product to obtain zinc oxide; the pulverized particle size was 45 μm.
Example 2
A method for preparing zinc oxide by leaching secondary zinc oxide comprises the following steps:
(1) adding water into secondary zinc oxide powder by using a mixing device for mixing, and granulating by using a disc type granulating device; the mass percentage of the zinc oxide powder to the added water is 100: 9, adding water at one time; the granularity of the secondary zinc oxide powder particles is 11 mm;
(2) feeding the secondary zinc oxide particles into a roasting kiln for roasting for 2.5 hours at the kiln temperature of 400 ℃;
(3) cooling the secondary zinc oxide particles, and then adding a leaching agent ammonia water to obtain a leaching solution, wherein the liquid-solid volume mass ratio is 6: 1; the leaching temperature is 45 ℃; leaching for 2h, and filtering;
(4) adding hydrogen peroxide into the filtrate, maintaining the temperature at 55 ℃ for 0.7h, and filtering;
(5) heating the filtrate to 90 deg.C under 0.03MPa until the liquid is completely volatilized;
(6) stirring and washing the product obtained in the step (5) for 4 times by using deionized water, wherein the liquid-solid volume ratio is 2: 1; the single washing time of the deionized water is 17 min;
(7) aging and drying the washed product; aging for 60 min; the drying temperature is 120 ℃, and the drying time is 1.5 h;
(8) crushing the dried product, putting the crushed product into a calcining kiln, calcining the crushed product for 2.5 hours at the temperature of 650 ℃, and cooling the calcined product to obtain zinc oxide; the pulverized particle size was 49 μm.
Example 3
A method for preparing zinc oxide by leaching secondary zinc oxide comprises the following steps:
(1) adding water into secondary zinc oxide powder by using a mixing device for mixing, and granulating by using a disc type granulating device; the mass percentage of the zinc oxide powder to the added water is 100: 10, adding water at one time; the granularity of the secondary zinc oxide powder particles is 15 mm;
(2) feeding the secondary zinc oxide particles into a roasting kiln to roast for 3 hours at the kiln temperature of 300 ℃;
(3) cooling the secondary zinc oxide particles, and then adding a leaching agent ammonia water to obtain a leaching solution, wherein the liquid-solid volume mass ratio is 8: 1; the leaching temperature is 50 ℃; leaching for 1h, and filtering;
(4) adding hydrogen peroxide into the filtrate, maintaining the temperature at 65 ℃ for 0.5h, and filtering;
(5) heating the filtrate to 100 deg.C under 0.02MPa until the liquid is completely volatilized;
(6) stirring and washing the product obtained in the step (5) for 5 times by using deionized water, wherein the volume ratio of liquid to solid is 3: 1; the single washing time of the deionized water is 15 min;
(7) aging and drying the washed product; aging for 70 min; the drying temperature is 150 ℃, and the drying time is 1 h;
(8) crushing the dried product, putting the crushed product into a calcining kiln, calcining the crushed product for 2 hours at 700 ℃, and cooling the calcined product to obtain zinc oxide; the pulverized particle size was 53 μm.
The method for preparing zinc oxide by leaching zinc hypoxide provided by the embodiment has the advantages of low cost and good effect, and can be suitable for large-scale production.
Claims (7)
1. A method for preparing zinc oxide by leaching secondary zinc oxide is characterized by comprising the following steps:
(1) adding water into secondary zinc oxide powder, mixing, and granulating by a granulating device;
(2) feeding the secondary zinc oxide particles into a roasting kiln to roast for 2-3h at the kiln temperature of 300-500 ℃;
(3) cooling the secondary zinc oxide particles, and then adding a leaching agent ammonia water to obtain a leaching solution, wherein the liquid-solid volume mass ratio is (5-8) to 1; the leaching temperature is 40-50 ℃; leaching for 1-3 h, and filtering;
(4) adding hydrogen peroxide into the filtrate, maintaining the temperature at 45-65 deg.C for 0.5-1h, and filtering;
(5) heating the filtrate to 80-100 ℃ under 0.02-0.05 MPa until the liquid is completely volatilized;
(6) stirring and washing the product obtained in the step (5) for 3-5 times by using deionized water, wherein the volume ratio of liquid to solid is 2-3: 1;
(7) aging and drying the washed product;
(8) and crushing the dried product, then placing the crushed product into a calcining kiln, calcining the crushed product for 2 to 3 hours at the temperature of 600-700 ℃, and cooling the calcined product to obtain the zinc oxide.
2. The method for preparing zinc oxide by leaching zinc hypoxide according to claim 1, wherein in the step (1), the zinc hypoxide powder is uniformly mixed with water by using a mixing device, and the mass percentage of the zinc oxide powder to the added water is 100: (8-10), adding water at one time.
3. The method for preparing zinc oxide by leaching secondary zinc oxide according to claim 1, wherein in the step (1), the granulating device is a disk-type granulating device, and the granularity of the granules of the secondary zinc oxide powder is 8-15 mm.
4. The method for preparing zinc oxide by leaching zinc hypoxide according to claim 1, wherein in the step (6), the single washing time of deionized water is 15-20 min.
5. The method for preparing zinc oxide by leaching secondary zinc oxide according to claim 1, wherein in the step (7), the aging time is 50-70 min.
6. The method for preparing zinc oxide by leaching zinc hypoxide as claimed in claim 1, wherein in the step (7), the drying temperature is 100-150 ℃ and the drying time is 1-2 h.
7. The method for preparing zinc oxide by leaching zinc hypoxide according to claim 1, wherein in the step (8), the crushed particle size is 45-53 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911230942.8A CN111020216A (en) | 2019-12-05 | 2019-12-05 | Method for preparing zinc oxide by leaching secondary zinc oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911230942.8A CN111020216A (en) | 2019-12-05 | 2019-12-05 | Method for preparing zinc oxide by leaching secondary zinc oxide |
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| Publication Number | Publication Date |
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| CN111020216A true CN111020216A (en) | 2020-04-17 |
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| CN201911230942.8A Withdrawn CN111020216A (en) | 2019-12-05 | 2019-12-05 | Method for preparing zinc oxide by leaching secondary zinc oxide |
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2019
- 2019-12-05 CN CN201911230942.8A patent/CN111020216A/en not_active Withdrawn
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Application publication date: 20200417 |