CN111020221A - Method for preparing aluminum smelting composite fluxing agent by using aluminum alkaline residues - Google Patents
Method for preparing aluminum smelting composite fluxing agent by using aluminum alkaline residues Download PDFInfo
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- CN111020221A CN111020221A CN201911270587.7A CN201911270587A CN111020221A CN 111020221 A CN111020221 A CN 111020221A CN 201911270587 A CN201911270587 A CN 201911270587A CN 111020221 A CN111020221 A CN 111020221A
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- aluminum
- hydrofluoric acid
- smelting
- fluxing agent
- sodium hydroxide
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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
- C22B21/00—Obtaining aluminium
- C22B21/06—Obtaining aluminium refining
- C22B21/062—Obtaining aluminium refining using salt or fluxing agents
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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
- C22B21/00—Obtaining aluminium
- C22B21/0038—Obtaining aluminium by other processes
- C22B21/0069—Obtaining aluminium by other processes from scrap, skimmings or any secondary source aluminium, e.g. recovery of alloy constituents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a method for preparing an aluminum-smelting composite fluxing agent by using aluminum alkaline slag, which comprises the following steps: (1) soaking the aluminum alkali slag in a sodium hydroxide solution to react to obtain a mixed system A; (2) carrying out solid-liquid separation on the mixed system A and then collecting liquid B; (3) uniformly mixing the liquid B and a hydrofluoric acid solution until a solid precipitate C is generated to obtain a mixed system D; (4) and uniformly mixing the mixed system D and ammonia water, and then evaporating and crystallizing to obtain the aluminum-smelting composite fluxing agent. The method realizes the recycling treatment of the aluminum alkali slag, and finally prepares the aluminum-smelting composite fluxing agent. The method does not generate new pollutants, the product can be used as an aluminum smelting flux, and the method has high value, not only solves the problem of processing the aluminum alkali slag, but also obtains the aluminum smelting composite flux, and the prepared aluminum smelting composite flux is more beneficial to saving electric energy and the dosage of the flux in the aluminum smelting process.
Description
Technical Field
The invention relates to the technical field of environmental solid waste treatment, in particular to a method for preparing an aluminum smelting composite fluxing agent by using aluminum alkaline residues.
Background
The aluminum alkaline residue is a solid waste, the generation process of the aluminum alkaline residue is to soak with alkaline liquor to remove oxide on the surface of the aluminum profile to generate waste liquor, and the waste liquor is neutralized by acid and lime and then is subjected to polyamide flocculation filtration to obtain filter residue.
The aluminum alkaline residue belongs to solid waste of HW 17-336-. The detection shows that the content of aluminum element in the aluminum alkaline residue is generally about 11-15%, and the aluminum alkaline residue is generally subjected to landfill treatment before, but the landfill treatment can cause waste of aluminum resource and occupy land.
Disclosure of Invention
The invention aims to overcome the problem of resource waste caused by landfill treatment of aluminum alkaline slag in the prior art and provides a method for preparing an aluminum smelting composite fluxing agent by using the aluminum alkaline slag.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for preparing an aluminum-smelting composite fluxing agent by utilizing aluminum alkaline slag comprises the following steps:
(1) soaking the aluminum alkali slag in a sodium hydroxide solution to react to obtain a mixed system A;
(2) carrying out solid-liquid separation on the mixed system A and then collecting liquid B;
(3) uniformly mixing the liquid B and a hydrofluoric acid solution until solid precipitates are generated to obtain a mixed system C;
(4) and uniformly mixing the mixed system C and ammonia water, and then evaporating and crystallizing to obtain the aluminum-smelting composite fluxing agent.
The method realizes the recycling treatment of the aluminum alkali slag, and finally prepares the aluminum-smelting composite fluxing agent, the method does not generate new pollutants, the product can be used as the aluminum-smelting fluxing agent, and the method has high value, not only solves the problem of the treatment of the aluminum alkali slag, but also obtains the aluminum-smelting composite fluxing agent, and the prepared aluminum-smelting composite fluxing agent is more beneficial to saving electric energy and the dosage of the fluxing agent in the aluminum smelting process.
Preferably, in the step (1), the mass ratio of the aluminum element in the aluminum alkaline residue to the sodium hydroxide in the sodium hydroxide solution is 1 (4-4.5).
Preferably, in the step (1), the mass ratio of the aluminum element in the aluminum alkaline residue to the sodium hydroxide in the sodium hydroxide solution is 1 (4.2-4.3).
The inventor finds that in the step (1) of the method, when the mass ratio of the aluminum element in the aluminum alkaline residue to the sodium hydroxide in the sodium hydroxide solution is 1 (4.2-4.3), the extraction efficiency of the aluminum alkaline residue is higher due to the fact that the amount of the sodium hydroxide solution used is smaller.
Preferably, in the step (3), the hydrofluoric acid solution is used in an amount of: in the step (1), the mass ratio of the aluminum element in the aluminum alkaline residue to the hydrogen fluoride in the hydrofluoric acid solution is 1: (4-4.5).
Preferably, in the step (3), the hydrofluoric acid solution is used in an amount of: in the step (1), the mass ratio of the aluminum element in the aluminum alkaline residue to the hydrogen fluoride in the hydrofluoric acid solution is 1: (4.2-4.3).
The inventor finds that the amount of the hydrofluoric acid solution in the step (3) of the method is that the mass ratio of the aluminum element in the aluminum alkaline residue in the step (1) to the hydrogen fluoride in the hydrofluoric acid solution is 1: and (4.2-4.3) the obtained aluminum-smelting composite fluxing agent saves more electric energy in the aluminum smelting process.
Preferably, the amount of ammonia water used in step (4) is: the mass ratio of the ammonia monohydrate in the ammonia water to the hydrogen fluoride in the hydrofluoric acid solution in the step (3) is 1: 1-1.5.
Preferably, the amount of ammonia water used in step (4) is: and (3) the mass ratio of the ammonia monohydrate in the ammonia water to the hydrogen fluoride in the hydrofluoric acid solution in the step (3) is 1: 1.2-1.3.
The inventor finds that the amount of ammonia water used in step (4) of the method is as follows: and (3) when the mass ratio of the ammonia monohydrate in the ammonia water to the hydrogen fluoride in the hydrofluoric acid solution in the step (3) is 1: 1.2-1.3, the obtained aluminum smelting composite fluxing agent saves more electric energy in the aluminum smelting process.
Preferably, in the step (1), the aluminum alkaline residue is dried, crushed to more than 80 meshes and immersed in a sodium hydroxide solution, the mass concentration of the sodium hydroxide solution is 20-40%, and the immersion time is 3-5 hours.
Preferably, the aluminum alkaline residue is waste residue generated after neutralization and precipitation of aluminum material after alkaline etching treatment.
Preferably, in the step (4), the mass concentration of the hydrofluoric acid is 40% to 50%.
The invention has the beneficial effects that: the invention provides a method for preparing an aluminum-smelting composite fluxing agent by using aluminum alkaline residues, which realizes the recycling treatment of the aluminum alkaline residues and finally prepares the aluminum-smelting composite fluxing agent, the product can be used as the aluminum-smelting fluxing agent and has high value, the method not only solves the treatment of the aluminum alkaline residues, but also obtains the aluminum-smelting composite fluxing agent, and the prepared aluminum-smelting composite fluxing agent is more beneficial to saving electric energy and the dosage of the fluxing agent in the aluminum smelting process.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
The method for preparing the aluminum smelting composite fluxing agent by using the aluminum alkaline residues, which is provided by the embodiment of the invention, comprises the following steps:
(1) measuring the content of aluminum element in the aluminum alkali slag, drying and crushing the aluminum alkali slag to be more than 80 meshes, soaking the aluminum alkali slag in a 30% sodium hydroxide solution, and reacting for 4 hours to obtain a mixed system A, wherein the mass ratio of the aluminum element in the aluminum alkali slag to the sodium hydroxide in the sodium hydroxide solution is 1: 4.2;
(2) carrying out solid-liquid separation on the mixed system A and then collecting liquid B;
(3) and (3) uniformly mixing the liquid B and a hydrofluoric acid solution with the mass concentration of 40% until solid precipitates are generated to obtain a mixed system C, wherein the use amount of the hydrofluoric acid solution is that the mass ratio of aluminum element in the aluminum alkaline residue in the step (1) to hydrogen fluoride in the hydrofluoric acid solution is 1: 4.2;
(4) and uniformly mixing the mixed system C with 25% ammonia water by mass concentration, and then evaporating and crystallizing to obtain the aluminum-smelting composite fluxing agent, wherein the dosage of the ammonia water is as follows: the mass ratio of the ammonia monohydrate in the ammonia water to the hydrogen fluoride in the hydrofluoric acid solution in the step (3) is 1: 1.2.
Example 2
As a method for preparing an aluminum-smelting composite fluxing agent by using aluminum alkaline slag in the embodiment of the invention, the only difference between the embodiment and the embodiment 1 is as follows: in the step (4), the dosage of ammonia water is as follows: the mass ratio of the ammonia monohydrate in the ammonia water to the hydrogen fluoride in the hydrofluoric acid solution in the step (3) is 1:1.
Example 3
As a method for preparing an aluminum-smelting composite fluxing agent by using aluminum alkaline slag in the embodiment of the invention, the only difference between the embodiment and the embodiment 1 is as follows: in the step (4), the dosage of ammonia water is as follows: the mass ratio of the ammonia monohydrate in the ammonia water to the hydrogen fluoride in the hydrofluoric acid solution in the step (3) is 1: 1.3.
Example 4
As a method for preparing an aluminum-smelting composite fluxing agent by using aluminum alkaline slag in the embodiment of the invention, the only difference between the embodiment and the embodiment 1 is as follows: in the step (4), the dosage of ammonia water is as follows: the mass ratio of the ammonia monohydrate in the ammonia water to the hydrogen fluoride in the hydrofluoric acid solution in the step (3) is 1: 1.4.
Example 5
As a method for preparing an aluminum-smelting composite fluxing agent by using aluminum alkaline slag in the embodiment of the invention, the only difference between the embodiment and the embodiment 1 is as follows: in the step (4), the dosage of ammonia water is as follows: the mass ratio of the ammonia monohydrate in the ammonia water to the hydrogen fluoride in the hydrofluoric acid solution in the step (3) is 1: 1.5.
Effect example 1
Under the conditions that the voltage is 3-5V and the current is: the results of the calculation of the average aluminum-making composite flux and the electric energy consumed per ton of aluminum-making were shown in table 1, wherein 1000kg of aluminum was made in parallel three times by using the aluminum-making composite fluxes of examples 1 to 5 as the aluminum-making aids for electrolytic aluminum-making at 60A and at 950 to 970 ℃.
TABLE 1 application Effect of the aluminum-making composite fluxing agents of examples 1 to 5
The results of the examples 1 to 5 show that when the aluminum-smelting composite fluxing agent obtained in the examples 1 to 5 is used as an aluminum-smelting auxiliary agent, the electric energy is saved and the using amount of the aluminum-smelting auxiliary agent is saved compared with the existing aluminum-smelting auxiliary agent; comparing the results of examples 1 to 5, it is shown that the amount of ammonia used in step (4) is, in comparison: and (3) when the mass ratio of the ammonia monohydrate in the ammonia water to the hydrogen fluoride in the hydrofluoric acid solution in the step (3) is 1: 1.2-1.3, the obtained aluminum smelting composite fluxing agent saves more electric energy in the aluminum smelting process.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A method for preparing an aluminum smelting composite fluxing agent by utilizing aluminum alkaline residues is characterized by comprising the following steps:
(1) soaking the aluminum alkali slag in a sodium hydroxide solution to react to obtain a mixed system A;
(2) carrying out solid-liquid separation on the mixed system A and then collecting liquid B;
(3) uniformly mixing the liquid B and a hydrofluoric acid solution until solid precipitates are generated to obtain a mixed system C;
(4) and uniformly mixing the mixed system C and ammonia water, and then evaporating and crystallizing to obtain the aluminum-smelting composite fluxing agent.
2. The method according to claim 1, wherein in the step (1), the mass ratio of the aluminum element in the aluminum alkaline residue to the sodium hydroxide in the sodium hydroxide solution is 1 (4-4.5).
3. The method according to claim 2, wherein in the step (1), the mass ratio of the aluminum element in the aluminum alkaline residue to the sodium hydroxide in the sodium hydroxide solution is 1 (4.2-4.3).
4. The method according to claim 1, wherein in the step (3), the hydrofluoric acid solution is used in an amount of: in the step (1), the mass ratio of the aluminum element in the aluminum alkaline residue to the hydrogen fluoride in the hydrofluoric acid solution is 1: (4-4.5).
5. The method according to claim 4, wherein in the step (3), the hydrofluoric acid solution is used in an amount of: in the step (1), the mass ratio of the aluminum element in the aluminum alkaline residue to the hydrogen fluoride in the hydrofluoric acid solution is 1: (4.2-4.3).
6. The method according to claim 1, wherein the amount of ammonia water used in step (4) is: the mass ratio of the ammonia monohydrate in the ammonia water to the hydrogen fluoride in the hydrofluoric acid solution in the step (3) is 1: 1-1.5.
7. The method according to claim 6, wherein the amount of ammonia water used in step (4) is: and (3) the mass ratio of the ammonia monohydrate in the ammonia water to the hydrogen fluoride in the hydrofluoric acid solution in the step (3) is 1: 1.2-1.3.
8. The method according to claim 1, wherein in the step (1), the aluminum alkaline residue is dried, crushed to 80 meshes or more, and then soaked in a sodium hydroxide solution, wherein the mass concentration of the sodium hydroxide solution is 30-50%, and the soaking time is 3-5 hours.
9. The method according to claim 1, wherein the aluminum alkaline residue is a residue produced by neutralizing and precipitating an aluminum material after alkaline etching.
10. The method according to claim 1, wherein the mass concentration of the hydrofluoric acid in the step (3) is 40-50%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911270587.7A CN111020221B (en) | 2019-12-11 | 2019-12-11 | Method for preparing aluminum smelting composite fluxing agent by using aluminum alkaline residues |
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| CN201911270587.7A CN111020221B (en) | 2019-12-11 | 2019-12-11 | Method for preparing aluminum smelting composite fluxing agent by using aluminum alkaline residues |
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| CN111020221A true CN111020221A (en) | 2020-04-17 |
| CN111020221B CN111020221B (en) | 2022-04-05 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351224A (en) * | 2011-07-01 | 2012-02-15 | 佛山科学技术学院 | Process for preparing active alumina from aluminum section industrial wastewater alkaline residues |
| CN103159244A (en) * | 2011-12-14 | 2013-06-19 | 常熟市新华化工有限公司 | Method for production of sodium aluminum fluoride |
| CN103950961A (en) * | 2014-04-04 | 2014-07-30 | 中国科学院过程工程研究所 | Method for preparing aluminum hydroxide from industrial waste residue generated in aluminum alloy surface treatment |
| CN104556179A (en) * | 2014-12-09 | 2015-04-29 | 常宁市华骏再生资源有限公司 | Method for producing cryolite from fluorine-containing waste gas |
| CN104556180A (en) * | 2014-12-09 | 2015-04-29 | 常宁市华骏再生资源有限公司 | Production method of cryolite |
| CN108059178A (en) * | 2017-12-29 | 2018-05-22 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | A kind of method that Aluminum subtracts the waste liquid production ice crystal of slag |
-
2019
- 2019-12-11 CN CN201911270587.7A patent/CN111020221B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351224A (en) * | 2011-07-01 | 2012-02-15 | 佛山科学技术学院 | Process for preparing active alumina from aluminum section industrial wastewater alkaline residues |
| CN103159244A (en) * | 2011-12-14 | 2013-06-19 | 常熟市新华化工有限公司 | Method for production of sodium aluminum fluoride |
| CN103950961A (en) * | 2014-04-04 | 2014-07-30 | 中国科学院过程工程研究所 | Method for preparing aluminum hydroxide from industrial waste residue generated in aluminum alloy surface treatment |
| CN104556179A (en) * | 2014-12-09 | 2015-04-29 | 常宁市华骏再生资源有限公司 | Method for producing cryolite from fluorine-containing waste gas |
| CN104556180A (en) * | 2014-12-09 | 2015-04-29 | 常宁市华骏再生资源有限公司 | Production method of cryolite |
| CN108059178A (en) * | 2017-12-29 | 2018-05-22 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | A kind of method that Aluminum subtracts the waste liquid production ice crystal of slag |
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| CN111020221B (en) | 2022-04-05 |
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Effective date of registration: 20201119 Address after: Room 706, 26 Jinlong Road, Nansha District, Guangzhou City, Guangdong Province 510000 Applicant after: Guangzhou Yajule solid waste treatment Co., Ltd Address before: 518052 14 / f-14017, main tower, Ocean Center, No.59 Linhai Avenue, Qianhai Shenzhen Hong Kong cooperation zone, Shenzhen, Guangdong Province Applicant before: SHENZHEN AGILE ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |
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