CN105177311A - Sodium-chloride-salt-containing fusion used for aluminum melt treatment and production method of sodium-chloride-salt-containing fusion - Google Patents
Sodium-chloride-salt-containing fusion used for aluminum melt treatment and production method of sodium-chloride-salt-containing fusion Download PDFInfo
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- CN105177311A CN105177311A CN201510583577.4A CN201510583577A CN105177311A CN 105177311 A CN105177311 A CN 105177311A CN 201510583577 A CN201510583577 A CN 201510583577A CN 105177311 A CN105177311 A CN 105177311A
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- sodium
- rafting
- mgcl
- nacl
- villaumite
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Abstract
Disclosed is sodium-chloride-salt-containing fusion used for aluminum melt treatment. The fusion comprises, by weight, 60.01%-65% of MgCl2 and 35%-39.99% of NaCl, or 50%-70% of MgCl2, 25%-40% of NaCl, and 5%-20% of KCl. The sum of the weight percents of all the components is 100%. A production method of the sodium-chloride-salt-containing fusion comprises the steps that all the components are weighed according to the weight percents; then, all the components are poured into a crucible to be melted, after being stirred evenly, the components are poured out for cooling and solidification, and afterward crushing and screening are conducted; and finally, packaging is conducted with an anti-moisture bag. According to the sodium-chloride-salt-containing fusion and the production method thereof, the raw materials are wide in source and low in cost; sodium, calcium, lithium and other alkali metal elements, oxide inclusions and hydrogen can be effectively removed; in addition, the production cost is significantly reduced.
Description
Technical field
The invention belongs to the purefying process field of aluminium and alloy melt, be specifically related to a kind of for aluminium and alloy melt process containing sodium villaumite rafting and manufacture method thereof.
Background technology
In the fusion process of Aluminum-aluminum alloy, melt quality and environmental problem are the important issue of aluminum i ndustry.These all have substantial connection with the treatment process of melt with the flux used.
Often inevitably containing alkali metal impurities such as higher sodium, calcium and lithiums in aluminium ingot.Inside plants go back feed back and aluminium waste is mixed with nonmetallic impurity usually, organic materials and steam.These basic metal, nonmetal slag inclusion and steam can cause serious quality problems to aluminium to the casting of its alloy and follow-up manufacturing procedure.So before casting, refining agent must be used to carry out purefying process to aluminium water--except basic metal, removal of impurities degasification.
Remove basic metal to need, by chemical reaction, alkali metal atom to be cemented out, and in removal of impurities degasification, can be realized by the bubble absorption principle such as to swim.So, for the molten aluminium that alkali metal impurity content is higher, need to use reactive stronger refining agent to carry out purefying, such as hexachloroethane (C
2cl
6), chlorine etc.As refining agent, hexachloroethane has extraordinary refining effect.But use hexachloroethane can produce unpleasant stench, contaminate environment, affect the health of workman.Chlorine is once popular as refining agent, but, use chlorine refining can cause a large amount of chlorine and the airborne release of hydrochloric acid.And recently find, a kind of carcinogens may be formed in logical chlorine to aluminium liquid--Dioxins (Dixon), causes serious environmental pollution, so hexachloroethane, chlorine are eliminated gradually as refining agent.
With MgCl
2refining agent for base is the ideal chose of alternative chlorine refining.This refining agent has concurrently and removes basic metal, removes the comprehensive action such as oxide inclusion and dehydrogenation, free from environmental pollution again.MgCl in refining agent
2liquid MgCl is dissolved into rapidly in aluminium water
2, there is replacement(metathesis)reaction with Na, Li and the Ca in aluminium water:
MgCl
2+2Na→2NaCl+Mg
MgCl
2+2Li→2LiCl+Mg
MgCl
2+Ca→CaCl
2+Mg
NaCl, LiCl and CaCl of generating
2float to surface, thus reach the object removing Na, Li and Ca.On the other hand, oxide inclusions and the refining agent be melted in aluminium water collide and are bonded in molten refined agent, and interfacial characteristics changes thereupon, and these Slag inclusion are no longer by aluminium water-wet.Then, be melted the wetting Slag inclusion particle of refining agent and float, incorporate in the slag of aluminium water surface, reach the object of slagging-off.
US Patent No. 4099965 discloses a kind of MgCl
2-KCl rafting refining agent, containing 20-40%KCl, 60-80MgCl
2.Achieve good refining effect, in reduction molding floor chlorine usage quantity, serve active effect.
But KCl resource compares shortage in China, the main dependence on import of especially high-grade KCl, price is high.And NaCl resource is very abundant, cheap.Use NaCl to substitute KCl and there is positive effect.But for aluminium alloy, the aluminium alloy that especially Mg content is higher, it is generally acknowledged, sodium is a sensitive elements, easily produces sodium crisp.If sodium content is higher, the fragility of alloy increases, and in the operation of rolling, easily produces limit and splits.So the use of NaCl is strictly limited, especially in high-magnesium aluminum alloy, often use without sodium fusion agent, prevent sodium fusion from entering in molten aluminium, cause sodium crisp, so there is no MgCl at present
2the refining agent of-NaCl combination.
In fact, villaumite forms fused salt after melting in molten aluminium, the atoms metal in villaumite, if it is out replaced that replacement(metathesis)reaction does not occur, can not separate and fuse in molten aluminium from fused salt.The experiment of the applicant shows, in the aluminium-magnesium alloy melt of 3 kilograms, (Mg content is 4.8%) adds 50 grams of MgCl
2-NaCl rafting (62%MgCl
2-38%NaCl), melt temperature 750
oc, is incubated 6 hours.Every 15 minutes of period stir about 1 minute.Then the change of sodium in aluminum alloy content is analyzed.Result shows, in alloy, the content of sodium does not increase.That is the sodium in NaCl can not enter in molten aluminium.This provides condition for substituting KCl with NaCl.
On the other hand, at MgCl
2in-KCl flux, that play refining cleaning action is MgCl
2, KCl only plays filler.So, substitute KCl with NaCl, the effect of the refining purification of flux can not be affected.
Based on above-mentioned experimental result, the present invention proposes and use NaCl partly or entirely to substitute MgCl
2kCl in-KCl rafting refining agent, forms refining effect excellent, and cheap contains sodium fusion compound refining agent.This sodium fusion compound refining agent that contains comprises MgCl
2-NaCl and MgCl
2-NaCl-KCl two series, to all or part of alternative KCl of application NaCl.Not only there is excellent purefying effect, free from environmental pollution, and also raw material sources is extensive, and cheap.
Summary of the invention
The technical problem to be solved in the present invention is, proposes cheap containing sodium fusion compound refining agent, may be used for the refining agent needed for purefying in aluminium alloy smelting process.Of the present invention have good refining effect containing sodium fusion compound refining agent, can effectively remove alkali metal, oxide inclusion and the hydrogen such as sodium, calcium, lithium, and raw material sources is extensive, cheap.
For molten aluminium process containing a sodium villaumite rafting, it is characterized in that, described rafting is by MgCl
2form with NaCl fusion, the content of two components is respectively: MgCl
260.01-65%(mass percent), NaCl35-39.99%(mass percent), two constituent mass percentage ratio summations are 100%.
For molten aluminium process containing a sodium villaumite rafting, it is characterized in that, described rafting is by MgCl
2, NaCl and KCl fusion form, each component concentration is respectively: MgCl
250-70%(mass percent), NaCl25-45%(mass percent), KCl5-20%(mass percent), three constituent mass percentage ratio summations are 100%.
For the manufacture method containing sodium villaumite rafting of molten aluminium process, the described all components containing sodium villaumite rafting is pressed certain mass percentage ratio and loads in crucible, at 750-850
oat the temperature of C, all components is melted, and mixes, then will pour out containing sodium villaumite rafting and at room temperature cooling make it solidify, again that it is broken after solidifying, be crushed to the bulk of 5-100mm, encapsulate with moisture barrier bag, or broken and be sized to the particle of below 5mm, encapsulate with moisture barrier bag.
A kind of component containing sodium villaumite rafting refining agent for molten aluminium process of the present invention is by MgCl
2with NaCl composition or by MgCl
2, NaCl and KCl composition, composition proportion will consider two aspects, and one is the MgCl that requirement plays refining cleaning action
2content has enough high, ensures refining effect; Two is that requirement rafting has lower fusing point, to melt rapidly in aluminium water.According to MgCl
2-NaCl Molten Salt Phase Diagrams, MgCl
2the eutectic composition of-NaCl is 55.24%MgCl
2(mass percent), eutectic temperature is 459
oc.62%MgCl
2(mass percent) melt, by Peritectic Reaction, forms single compound NaMgCl
3, fusing point is 466
oc.This composition is applicable to doing refining agent very much, has both met high MgCl
2the requirement of content, meets again the requirement of low melting point.Based on this 2 point, the weight ratio of moiety is designed to: (60.01-65%) MgCl
2-(35-39.99%) NaCl; Or (50-70%) MgCl
2-(25-40%) NaCl-(5-20%) KCl, all components mass percent summation is 100%.
A kind of manufacture method containing sodium villaumite rafting for molten aluminium process of the present invention is: the weight weighing each component according to mass percent, then each component materials is poured in crucible and melt, after stirring, pour out cooled and solidified, then broken, and sieve.Finally, encapsulate with moisture barrier bag.
The invention has the beneficial effects as follows, raw material sources is extensive, cheap.With existing MgCl
2-KCl refining agent is compared, a kind of sodium villaumite rafting refining agent that contains for molten aluminium process of the present invention has good refining effect equally, can effectively remove alkali metal, oxide inclusion and the hydrogen such as sodium, calcium, lithium, but production cost significantly reduces.
Embodiment
The specific embodiment of the invention is as follows:
Embodiment one: prepare 100 kilograms containing sodium villaumite rafting refining agent, composition is 62%MgCl
2and 38%NaCl: weigh 62 kilograms of MgCl
2, 38 kilograms of NaCl, pour in crucible 750
oheat fused under C, after stirring, pour out and at room temperature cooling make it solidify, be then broken into particle and sieve, until grain diameter reaches below 5mm, finally, encapsulating with moisture barrier bag.
Embodiment two: prepare 100 kilograms containing sodium villaumite rafting refining agent, composition is 60.01%MgCl
2and 39.99%NaCl: weigh 60.01 kilograms of MgCl
2with 39.99 kilograms of NaCl, pour in crucible 780
oheat fused under C, after stirring, pour out and at room temperature cooling make it solidify, be then broken into particle and sieve, until grain diameter reaches below 3mm, finally, encapsulating with moisture barrier bag.
Embodiment three: prepare 100 kilograms containing sodium villaumite rafting refining agent, composition is 65%MgCl
2and 35%NaCl: weigh 65 kilograms of MgCl
2, 35 kilograms of NaCl, pour in crucible 850
oheat fused under C, after stirring, pour out and at room temperature cooling make it solidify, be then broken into the bulk of 5-50mm.Finally, encapsulate with moisture barrier bag.
Embodiment four: prepare 100 kilograms containing sodium villaumite rafting refining agent, composition is 60%MgCl
2with 30%NaCl and 10%KCl: weigh 60 kilograms of MgCl
2, 30 kilograms of NaCl and 10 kilogram KCl, pour in crucible 750
oheat fused under C, after stirring, pour out and at room temperature cooling make it solidify, be then broken into the bulk of 50-100mm.Finally, encapsulate with moisture barrier bag.
Embodiment five: prepare 100 kilograms containing sodium villaumite rafting refining agent, composition is 50%MgCl
2with 45%NaCl and 5%KCl: weigh 50 kilograms of MgCl
2, 45 kilograms of NaCl and 5 kilogram KCl, pour in crucible 850
oheat fused under C, after stirring, pour out and at room temperature cooling make it solidify, be then broken into the bulk of 5-50mm.Finally, encapsulate with moisture barrier bag.
Embodiment six: prepare 100 kilograms containing sodium villaumite rafting refining agent, composition is 70%MgCl
2with 25%NaCl and 5%KCl: weigh 70 kilograms of MgCl
2, 25 kilograms of NaCl and 5 kilogram KCl, pour in crucible 800
oheat fused under C, after stirring, pour out and at room temperature cooling make it solidify, be then broken into particle and sieve, until grain diameter reaches below 5mm, finally, encapsulating with moisture barrier bag.
Embodiment seven: prepare 100 kilograms containing sodium villaumite rafting refining agent, composition is 52%MgCl
2with 28%NaCl and 20%KCl: weigh 52 kilograms of MgCl
2, 28 kilograms of NaCl and 20 kilogram KCl, pour in crucible 750
oheat fused under C, after stirring, pour out and at room temperature cooling make it solidify, be then broken into particle and sieve, until grain diameter reaches below 5mm, finally, encapsulating with moisture barrier bag.
The sodium villaumite rafting that contains of the present invention is applicable to various aluminium alloy, and comprising 5000 is be contour Mg content alloy with 7000, use temperature 700-800 DEG C.
Claims (4)
1. for molten aluminium process containing a sodium villaumite rafting, it is characterized in that, described rafting is by MgCl
2form with NaCl fusion, the content of two components is respectively: MgCl
260.01-65%(mass percent), NaCl35-39.99%(mass percent), two constituent mass percentage ratio summations are 100%.
2. for molten aluminium process containing a sodium villaumite rafting, it is characterized in that, described rafting is by MgCl
2, NaCl and KCl fusion form, each component concentration is respectively: MgCl
250-70%(mass percent), NaCl25-45%(mass percent), KCl5-20%(mass percent), three constituent mass percentage ratio summations are 100%.
3. for the manufacture method containing sodium villaumite rafting of molten aluminium process, it is characterized in that, the described all components containing sodium villaumite rafting is pressed certain mass percentage ratio and loads in crucible, and at 750-850
oat the temperature of C, all components is melted, and mix, then will to pour out containing sodium villaumite rafting and at room temperature cooling makes it solidify, again that it is broken after solidifying, encapsulate with moisture barrier bag.
4. a kind of manufacture method containing sodium villaumite rafting for molten aluminium process according to claim 3, it is characterized in that, be crushed to the bulk of 5-100mm after rafting solidifies, encapsulate with moisture barrier bag, or broken and be sized to the particle of below 5mm, encapsulate with moisture barrier bag.
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|---|---|---|---|
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|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108085546A (en) * | 2018-01-30 | 2018-05-29 | 营口忠旺铝业有限公司 | A kind of 2024 aluminium alloy smelting casting methods |
| CN109097618A (en) * | 2018-08-07 | 2018-12-28 | 湖南金联星特种材料股份有限公司 | Aluminium alloy floride-free particle refining agent and its manufacturing method |
| CN110863112A (en) * | 2019-10-15 | 2020-03-06 | 东北大学 | Resource utilization method of aluminum slag generated in aluminum refining process |
| CN113699404A (en) * | 2021-08-25 | 2021-11-26 | 苏州大学 | Composite salt for purifying aluminum waste and preparation and use methods thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102459663A (en) * | 2009-06-08 | 2012-05-16 | 派瑞泰克有限公司 | Use of a binary salt flux of nacl and mgci2 for the purification of aluminum or aluminum alloys, and method thereof |
| CN104328299A (en) * | 2014-10-23 | 2015-02-04 | 山东南山铝业股份有限公司 | Flux for aluminum and aluminum alloy melt refining and preparation method of flux |
-
2015
- 2015-09-15 CN CN201510583577.4A patent/CN105177311A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102459663A (en) * | 2009-06-08 | 2012-05-16 | 派瑞泰克有限公司 | Use of a binary salt flux of nacl and mgci2 for the purification of aluminum or aluminum alloys, and method thereof |
| CN104328299A (en) * | 2014-10-23 | 2015-02-04 | 山东南山铝业股份有限公司 | Flux for aluminum and aluminum alloy melt refining and preparation method of flux |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108085546A (en) * | 2018-01-30 | 2018-05-29 | 营口忠旺铝业有限公司 | A kind of 2024 aluminium alloy smelting casting methods |
| CN109097618A (en) * | 2018-08-07 | 2018-12-28 | 湖南金联星特种材料股份有限公司 | Aluminium alloy floride-free particle refining agent and its manufacturing method |
| CN110863112A (en) * | 2019-10-15 | 2020-03-06 | 东北大学 | Resource utilization method of aluminum slag generated in aluminum refining process |
| CN113699404A (en) * | 2021-08-25 | 2021-11-26 | 苏州大学 | Composite salt for purifying aluminum waste and preparation and use methods thereof |
| CN113699404B (en) * | 2021-08-25 | 2022-06-24 | 苏州大学 | Composite salt for purifying aluminum waste and preparation and use methods thereof |
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Application publication date: 20151223 |
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