CN104120280A - Method for removing impurity element zinc out of secondary aluminum melt - Google Patents
Method for removing impurity element zinc out of secondary aluminum melt Download PDFInfo
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- CN104120280A CN104120280A CN201410374543.XA CN201410374543A CN104120280A CN 104120280 A CN104120280 A CN 104120280A CN 201410374543 A CN201410374543 A CN 201410374543A CN 104120280 A CN104120280 A CN 104120280A
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- zinc
- secondary aluminum
- impurity element
- aluminum melt
- purifying method
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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
Abstract
The invention provides a method for removing impurity element zinc out of a secondary aluminum melt, belonging to the technical field of secondary aluminum purification. According to the method, secondary aluminum is heated to a temperature higher than the boiling point of zinc but lower than the boiling point of aluminum so that zinc is vaporized into zinc steam and separated from the aluminum melt. Compared with other methods for removing zinc from an aluminum alloy melt, the method disclosed by the invention has the most remarkable characteristics that the process is simple, the recovery efficiency is high, the actual yield of secondary aluminum is high (more than 95%), and the zinc removal effect is more than 95%.
Description
Technical field
The present invention relates to secondary aluminum purification techniques field, particularly, relate to the purifying method of impurity element zinc in a kind of secondary aluminum melt.
Background technology
Aluminium is the engineering metal that has regeneration to be worth most, and during melting, casting yield is high, and each cycle consumption amount is only 3.5%-8.5%, and can repeatedly reclaim, and in current world aluminum product, 33% is processed into by reclaiming aluminium scrap.The feature of the recycling maximum of secondary aluminum resource is by two: 1. save energy, compare with producing primary aluminum, and with aluminium scrap, produce secondary aluminum and can save energy more than 95%; 2. reduce environmental pollution, with respect to the production of primary aluminum, secondary aluminum is produced and is not only reduced waste water, waste sludge discharge, and its production process can reducing emission of carbon dioxide more than 90%.Along with the development of industrial technology, increasing field needs the lighting of material, and as Aeronautics and Astronautics and automobile etc., the application of high strength alumin ium alloy is also more and more extensive, and representative is in 7xxx aluminium alloy, and it is higher containing Zn amount.The consequent is to produce the very high alloyed scrap of a large amount of Zn of containing amount to need to reclaim, and in producing the secondary aluminium alloy process that zinc content is lower, may need to add a large amount of Raw Aluminium, with this, obtains the secondary aluminum of suitable component.Therefore how in secondary aluminium alloy regenerative process, removing zinc element becomes a current urgent problem.
In aluminium scrap, there is lot of trace alloying element.The method dezincifying in conventional regeneration aluminium alloy adopts oxidation refining method, the method is to utilize zinc to be more easily combined with oxygen and to generate the principle of oxide compound than aluminium, by pass into oxygen in aluminium scrap melt, and formation zinc oxide slag phase, realize zinc element separated from melt, but the actual recovered rate of the method aluminium is lower.
Through retrieval, find: in the patent that the people such as Song Jinlin are CN102392135A at publication number, mention, aluminium scrap is warming up to 670-700 ℃, in aluminium scrap melt, add zinc removing agent, and accelerate zinc removing agent being uniformly distributed in aluminium scrap melt by stirring, refining 5-20 minute, can reach dezincification object, although the method dezincification effect can arrive 90% left and right, the interpolation of zinc removing agent easily produces other impurity phase in secondary aluminium alloy.
Summary of the invention
For prior art above shortcomings, the object of the present invention is to provide the purifying method of impurity element zinc in a kind of secondary aluminum melt, the method utilizes the gasification temperature of zinc element lower than the principle of aluminium element gasification temperature, thereby arrives the object dezincifying in secondary aluminum melt.
For realizing above object, the invention provides the purifying method of impurity element zinc in a kind of secondary aluminum melt, described method utilizes the gasification temperature of zinc element lower than the principle of aluminium element gasification temperature, secondary aluminum is heated above to the boiling point of zinc but lower than the temperature of the boiling point of aluminium, makes zinc vaporization form zinc fume and depart from molten aluminium.
Described method concrete steps comprise:
Step 1, melting are prepared: by NaCl, KCl and Na
3alF
6mixing salt or NaCl, KCl and CaF
2mixing salt, together inserts in crucible with aluminium scrap;
Step 2, melting technology: smelting temperature is risen to 800-1000 ℃, refining 20-60min, zinc gasification departs from from molten aluminium, forms bubble and discharges melt.
Preferably, in step 1, described mixing salt is (0.08～2) with the mass ratio of aluminium scrap: 1.
Preferably, in step 1, described NaCl, KCl and Na
3alF
6mixing salt, wherein NaCl, KCl and Na
3alF
6mass ratio is 44:56:10.
Preferably, in step 1, described NaCl, KCl and CaF
2mixing salt, wherein NaCl, KCl and CaF
2mass ratio is 44:56:10.
In the present invention, the interpolation main purpose of fused salt (mixing salt) is to change aluminium scrap surfactivity, accelerates aluminium scrap fusing.
In the present invention, the temperature 800-1000 ℃ of melting, more preferably 900-1000 ℃ while selecting comparatively high temps, should shorten the time of refining as far as possible, in order to avoid reduce the actual recovery rate of aluminium element;
In aforesaid method, described melting technology can be carried out under vacuum condition, improves the interior vacuum tightness of stove effectively to improve effect and the efficiency of dezincification.Further, described in the vacuum tightness that vacuumizes be 1-50Pa, when vacuumizing, best vacuum tightness is 30-50Pa because pressure too little Yi cause alloy solution to splash, cause the waste of raw material, pressure is too large, is difficult for row's zinc.
Preferably, described step 2, can stir in the time of melting.Alr mode can be by argon gas stirring, ultrasonic agitation, mechanical stirring or magnetic field stirring etc. one or more, impel in secondary aluminum melt zinc bubble to discharge.The preferred argon gas of alr mode stirs, and can alleviate alloy melt splash phenomena at high temperature.
In aforesaid method, after described step 2, further comprise and reclaim zinc fume step.Zinc fume is passed into condensate filter by conduit, recycle metallic zinc, avoid environmental pollution.
Compared with prior art, the present invention has following beneficial effect:
1, by adding fused salt, change aluminium scrap surfactivity, accelerate the disengaging of aluminium waste surface alumina oxide, fused salt has the effect of the aluminum oxide slag that absorption peels off simultaneously, avoid slag inclusion in aluminium liquid to produce, accelerate scrap melting speed simultaneously, improve zinc impurities element purification efficiency;
2, improve smelting temperature, show by experiment, add after flux, control melt at high temperature under the condition of refining time, suitably improve smelting temperature, be not only conducive to improve the decontamination effect improving of zinc impurities element, and the efficiency dezincifying also can increase substantially;
3, because part zinc fume in secondary aluminum melt is not having stirring action float downward slow to the speed of liquid level, thereby reduced the effect dezincifying, affected production efficiency, the present invention stirs and can increase substantially dezincification effect and efficiency.
To sum up, the present invention than the most significant feature of the method that dezincifies in other aluminium alloy melt is: technique is simple, and organic efficiency is high, secondary aluminum actual recovery rate high (more than 95%), and dezincification effect arrives more than 95%.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
Embodiment 1: will be containing zinc aluminium scrap raw material (500g, in waste material, zinc content is 4.55%) and mixing salt (500g) (NaCl that mass ratio is 44:56:10, KCl and Na
3alF
6) together put as in crucible, be evacuated to 1Pa, temperature to be appreciated 800 ℃, aluminium scrap fusing passes into argon gas stirring in melt, through stirring, refining 1 hour, is cast into ingot, obtains 470g, and wherein zinc content is 0.20%.
In the present embodiment: secondary aluminum actual recovery rate is 98.5%, dezincification effect arrives 95.6%.
Embodiment 2: will be containing zinc aluminium scrap raw material (500g, in waste material, zinc content is 4.55%) and mixing salt (1000g) (NaCl that mass ratio is 44:56:10, KCl and Na
3alF
6) together put as in crucible, be evacuated to 5Pa, temperature to be appreciated 900 ℃, aluminium scrap fusing, adds induction stirring, through stirring, refining 50min, is cast into ingot, obtains 469g, and wherein zinc content is 0.15%.
In the present embodiment: secondary aluminum actual recovery rate is 98.3%, dezincification effect arrives 96.7%.
Embodiment 3: will be containing zinc aluminium scrap raw material (500g, in waste material, zinc content is 5.1%) and mixing salt (40g) (NaCl that mass ratio is 44:56:10, KCl and CaF
2) together put as in crucible, be evacuated to 20Pa, temperature to be appreciated 950 ℃, aluminium scrap fusing, adds mechanical stirring, through stirring, refining 30min, is cast into ingot, obtains 468g, and wherein zinc content is 0.23%.
In the present embodiment: secondary aluminum actual recovery rate is 98.6%, dezincification effect arrives 95.5%.
Embodiment 4: will be containing zinc aluminium scrap raw material (500g, in waste material, zinc content is 4.55%) and mixing salt (600g) (NaCl that mass ratio is 44:56:10, KCl and Na
3alF
6) together put as in crucible, be evacuated to 50Pa, temperature to be appreciated 1000 ℃, aluminium scrap fusing, adds ultrasonic agitation, through stirring, refining 30min, is cast into ingot, obtains 463g, and wherein zinc content is 0.13%.
In the present embodiment: secondary aluminum actual recovery rate is 97%, dezincification effect arrives 97.1%.
Embodiment 5: will be containing zinc aluminium scrap raw material (500g, in waste material, zinc content is 5.05%) and mixing salt (600g) (NaCl that mass ratio is 44:56:10, KCl and CaF
2) together put as in crucible, be evacuated to 30Pa, temperature to be appreciated 900 ℃, aluminium scrap fusing, adds ultrasonic agitation, through stirring, refining 30min, is cast into ingot, obtains 459g, and wherein zinc content is 0.2%.
In the present embodiment: secondary aluminum actual recovery rate is 96.7%, dezincification effect arrives 96%.
Embodiment 6: will be containing zinc aluminium scrap raw material (500g, in waste material, zinc content is 6.05%) and mixing salt (40g) (NaCl that mass ratio is 44:56:10, KCl and CaF
2) together put as in crucible, be evacuated to 25Pa, temperature to be appreciated 850 ℃, aluminium scrap fusing, adds ultrasonic agitation, through stirring, refining 30min, is cast into ingot, obtains 452g, and wherein zinc content is 0.28%.
In the present embodiment: secondary aluminum actual recovery rate is 96.2%, dezincification effect arrives 95.4%
In a word, the inventive method secondary aluminum actual recovery rate high (more than 95%), dezincification effect arrives more than 95%.
Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (10)
1. a purifying method for impurity element zinc in secondary aluminum melt, is characterized in that, described method is heated above secondary aluminum the boiling point of zinc but lower than the temperature of the boiling point of aluminium, makes zinc vaporization form zinc fume and depart from molten aluminium.
2. the purifying method of impurity element zinc in secondary aluminum melt according to claim 1, is characterized in that, concrete steps comprise:
Step 1: melting is prepared: by NaCl, KCl and Na
3alF
6mixing salt is together inserted in crucible with aluminium scrap; Or by NaCl, KCl and CaF
2mixing salt is together inserted in crucible with aluminium scrap;
Step 2: melting technology: smelting temperature is risen to 800-1000 ℃, refining 20-60min, zinc gasification departs from from molten aluminium, forms bubble and discharges melt.
3. the purifying method of impurity element zinc in a kind of secondary aluminum melt according to claim 2, is characterized in that, in step 1, described mixing salt is (0.08～2) with the mass ratio of aluminium scrap: 1.
4. the purifying method of impurity element zinc in a kind of secondary aluminum melt according to claim 2, is characterized in that described NaCl, KCl and Na
3alF
6mixing salt, wherein NaCl, KCl and Na
3alF
6mass ratio is 44:56:10.
5. the purifying method of impurity element zinc in a kind of secondary aluminum melt according to claim 2, is characterized in that described NaCl, KCl and CaF
2mixing salt, wherein NaCl, KCl and CaF
2mass ratio is 44:56:10.
6. according to the purifying method of impurity element zinc in a kind of secondary aluminum melt described in claim 2-5 any one, it is characterized in that, described melting technology is carried out under vacuum condition.
7. the purifying method of impurity element zinc in a kind of secondary aluminum melt according to claim 6, is characterized in that, described in the vacuum tightness that vacuumizes be 1-50Pa.
8. the purifying method of impurity element zinc in a kind of secondary aluminum melt according to claim 7, is characterized in that, described in vacuumize as 30-50Pa.
9. according to the purifying method of impurity element zinc in a kind of secondary aluminum melt described in claim 2-5 any one, it is characterized in that, described step 2, stirs in the time of melting, impels zinc bubble in secondary aluminum melt better to discharge.
10. the purifying method of impurity element zinc in a kind of secondary aluminum melt according to claim 9, is characterized in that, described stirring adopts to be divided into argon gas and to stir mechanical stirring or induction stirring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410374543.XA CN104120280A (en) | 2014-07-31 | 2014-07-31 | Method for removing impurity element zinc out of secondary aluminum melt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410374543.XA CN104120280A (en) | 2014-07-31 | 2014-07-31 | Method for removing impurity element zinc out of secondary aluminum melt |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109207741A (en) * | 2018-09-11 | 2019-01-15 | 昆明理工大学 | A kind of method of refining and device of metallic aluminium |
| CN111500880A (en) * | 2020-04-23 | 2020-08-07 | 浙江永杰铝业有限公司 | High-conductivity aluminum-magnesium alloy for spiral welded pipe and production method thereof |
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| CN101082093A (en) * | 2007-07-09 | 2007-12-05 | 东南大学 | Method for remelting and circulating utilization of waste foamed aluminium |
| CN101343694A (en) * | 2008-08-15 | 2009-01-14 | 昆明理工大学 | Dezincing smelting method for waste mixed aluminum alloy containing zinc |
| CN101532093A (en) * | 2009-04-16 | 2009-09-16 | 中铝青岛轻金属有限公司 | Method for removing zinc in renewable aluminum |
| CN101643855A (en) * | 2009-08-07 | 2010-02-10 | 中国船舶重工集团公司第十二研究所 | Method for refining aluminum and aluminum alloy melt through in-situ reduction |
| CN101845558A (en) * | 2010-02-09 | 2010-09-29 | 中南大学 | Aluminum slag separating agent and application of same in process of recycling aluminum from aluminum slag |
| CN102586623A (en) * | 2012-03-16 | 2012-07-18 | 南南铝业股份有限公司 | Extracting method and extracting device for high purity aluminum |
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2014
- 2014-07-31 CN CN201410374543.XA patent/CN104120280A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101082093A (en) * | 2007-07-09 | 2007-12-05 | 东南大学 | Method for remelting and circulating utilization of waste foamed aluminium |
| CN101343694A (en) * | 2008-08-15 | 2009-01-14 | 昆明理工大学 | Dezincing smelting method for waste mixed aluminum alloy containing zinc |
| CN101532093A (en) * | 2009-04-16 | 2009-09-16 | 中铝青岛轻金属有限公司 | Method for removing zinc in renewable aluminum |
| CN101643855A (en) * | 2009-08-07 | 2010-02-10 | 中国船舶重工集团公司第十二研究所 | Method for refining aluminum and aluminum alloy melt through in-situ reduction |
| CN101845558A (en) * | 2010-02-09 | 2010-09-29 | 中南大学 | Aluminum slag separating agent and application of same in process of recycling aluminum from aluminum slag |
| CN102586623A (en) * | 2012-03-16 | 2012-07-18 | 南南铝业股份有限公司 | Extracting method and extracting device for high purity aluminum |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109207741A (en) * | 2018-09-11 | 2019-01-15 | 昆明理工大学 | A kind of method of refining and device of metallic aluminium |
| CN111500880A (en) * | 2020-04-23 | 2020-08-07 | 浙江永杰铝业有限公司 | High-conductivity aluminum-magnesium alloy for spiral welded pipe and production method thereof |
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Application publication date: 20141029 |