CN103572080B - A kind of method for removing iron of secondary aluminum - Google Patents
A kind of method for removing iron of secondary aluminum Download PDFInfo
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- CN103572080B CN103572080B CN201310545026.XA CN201310545026A CN103572080B CN 103572080 B CN103572080 B CN 103572080B CN 201310545026 A CN201310545026 A CN 201310545026A CN 103572080 B CN103572080 B CN 103572080B
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Abstract
A method for removing iron for secondary aluminum, is characterized in that step is as follows: (1) by 50 ~ 70%Al-B master alloy of 0.5 ~ 2% of sial secondary aluminum quality and 30 ~ 50%Al-Mn master alloy, through 150 ~ 250 DEG C of preheatings 30 ~ 60 minutes; (2) to heat after sial secondary aluminum to 400 DEG C insulation 10 ~ 30 minutes, then be warming up to 700 DEG C; (3) after the fusing of sial secondary aluminum, add above-mentioned master alloy, slowly stir, after master alloy fusing, leave standstill 0.5 ~ 4 hour; (4) during casting, mould is fixed on the shaking table of frequency 10 ~ 40Hz, amplitude 5 ~ 10cm, casting and cooling under mechanical vibration.Method of the present invention is the method for removing iron of a kind of deironing, crystal grain thinning and the secondary aluminum improving Fe-riched phase pattern, reduces secondary aluminum iron level, improves secondary aluminum tensile strength and unit elongation, is applicable to sial secondary aluminum.
Description
Technical field
The present invention relates to a kind of secondary aluminum cleaning molten method, be specifically related to a kind of method for removing iron of secondary aluminum.
Background technology
Aluminium alloy is widely used in the industry-by-industry of national economy with the performance of its excellence.In the metallic substance that the mankind use, the consumption of aluminium occupies second, is only second to iron and steel.China is aluminium producing country maximum in the world, and 2012 annual production reach 2,100 ten thousand tons, accounts for 40% of the whole world.But the alum clay resource of China is not enriched, and reserves account for about 3% of world saving, only enough exploit 20 years.Contradiction between bauxite resource shortage and the primary aluminum output day by day increased.
Secondary aluminum is by waste aluminum and scrap aluminium alloy material or the waste material containing aluminium, and refining through refuse and the aluminium alloy that obtains or aluminum metal, is an important sources of metallic aluminium.Because the source of secondary aluminum is complicated, very easily be mixed into the β-AlFeSi Fe-riched phase that the impurity element such as iron, silicon forms needle-like, seriously matrix is isolated when foundry goods is stressed, plasticity sharply declines, have a strong impact on ingot casting quality and properties for follow, greatly constrain the regeneration of aluminium scrap and the Sustainable development of bauxite resource.At present, Chinese scholars is mainly through deironing or change the pattern of Fe-riched phase and slow down its impact on ingot casting.American scholar finds that boron can catch the ferro element in molten aluminium the earliest, forms the large boronized iron of density, to be deposited on bottom melt thus to reach the object of deironing; The elements such as Mn, Cr, Be, Co are also usually used in the pattern changing Fe-riched phase in aluminium alloy.Compared with primary aluminum, the comprehensive energy consumption of producing secondary aluminum is only 5%, CO of electrolytic aluminum
2quantity discharged can reduce more than 90%, and economic benefit and environmental benefit are very remarkable.
CN1940101A " aluminium-alloy iron-removing solvent " discloses a kind of flux for removing iron, its proportioning is: 20 ~ 40% sodium-chlor, 20 ~ 40% Repone K, 1 ~ 10% hexafluoro sodium aluminate, 0 ~ 10% Sodium Fluoride, the boron oxide of 9 ~ 30% or Sodium Tetraborate, think boride in flux can and the larger boronized iron of the ferro element formation density of molten aluminium, iron-removal rate is to 60%.
CN102304649A " iron-removing fluxing ", it consists of the mountain aluminium refining agent of 20 ~ 40%, the Manganous chloride tetrahydrate of 30 ~ 50% and surplus coke, and be sprinkling upon equably on liquid level by mixed flux, iron-removal rate is to 52.65%.
CN103255306A " a kind of secondary aluminum deferrization technique ", adds at least one in borax or Manganous chloride tetrahydrate in aluminum silicon alloy, and by regulating the ratio of borax and Manganous chloride tetrahydrate, deironing rate can reach 49%.
Above-mentioned CN1940101A and CN103255306A relates to borax or boron oxide, and borax density is 2.28g/cm
3, boron oxide density is 1.82 ~ 2.46g/cm
3, all lower than the liquid-tight degree of aluminium, easily float on liquid level when adding separately, simultaneously borax 320 DEG C of decomposes, when borax 600 DEG C is heated, easily generates the very high glassy boron oxide of viscosity, hinder boride and contact with the further of melt.The Manganous chloride tetrahydrate specific absorption that CN102304649A adds, lower than 60%, is unfavorable for effective utilization of resource.In addition, above-mentioned patent does not all mention secondary aluminum mechanical property, especially plasticity index after deironing.Therefore, develop a kind of efficient, that utilization ratio is high method for removing iron to have important practical significance.
Summary of the invention
The object of the invention is the method for removing iron of the sial secondary aluminum proposing a kind of deironing, crystal grain thinning and improve Fe-riched phase pattern, reduce iron level and improve deironing rate, tensile strength and unit elongation.
Component of the present invention is: 50 ~ 70%Al-B master alloy, 30 ~ 50%Al-Mn master alloy, and addition is 0.5 ~ 2%.
The present invention propose method for removing iron step as follows: (1) by 50 ~ 70%Al-B master alloy of 0.5 ~ 2% of sial secondary aluminum quality and 30 ~ 50%Al-Mn master alloy, through 150 ~ 250 DEG C of preheatings 30 ~ 60 minutes; (2) to heat after sial secondary aluminum to 400 DEG C insulation 10 ~ 30 minutes, then be warming up to 700 DEG C; (3) after the fusing of sial secondary aluminum, add above-mentioned master alloy, slowly stir, after master alloy fusing, leave standstill 0.5 ~ 4 hour; (4) during casting, mould is fixed on the shaking table of frequency 10 ~ 40Hz, amplitude 5 ~ 10cm, casting and cooling under mechanical vibration.
The massfraction of Al-B master alloy B of the present invention is 1 ~ 10%.
The massfraction of Al-Mn master alloy Mn of the present invention is 10 ~ 70%.
The present invention adopts Al-B and Al-Mn master alloy as except ferrous components, and master alloy is easy to fuse into aluminium liquid on the one hand, avoids the oxidation of the alloying element caused because of density, different melting points and sinks to the bottom, improve the assimilation effect to B, Mn element; On the other hand, the Addition ofelements good dispersity such as B, Mn in master alloy, is conducive to catching the ferro element in sial secondary aluminum, significantly reduces the iron-holder in melt.The elements such as Al, Si, Fe in Mn, B element and sial secondary aluminum form the high-melting-points such as Fe-B, Al-Si-Mn-Fe, large density particle, and wherein a part of particle natural subsidence in the standing process of insulation, to furnace bottom, reaches the object of deironing; Another part forms Mn-Fe atom about than being 4:1 and 2:1 two kinds of Al-Si-Mn-Fe quad alloy phases, and the former is mainly in polygon-shaped, and the latter is reticulate pattern.Mechanical vibration are aided with in castingprocesses, on the one hand can broken dendrite arm, crystal grain, eliminate dentrite, thus crystal grain thinning, Al-Si-Mn-Fe quad alloy form can be promoted by reticulate pattern Chinese character shape to polygon-shaped transformation on the one hand, improve the unit elongation of aluminium silicon secondary aluminum.
Accompanying drawing explanation
Fig. 1 is the metallograph of embodiment 1.
Fig. 2 is the scanning electron microscope diagram of embodiment 1.
Embodiment
The present invention select iron-holder be 1.2% sial secondary aluminum, tensile strength 155MPa, unit elongation 3.5%, chemical composition is in table 1.
The composition (wt.%) of table 1 sial secondary aluminum
| Al | Si | Fe | Mg | Mn | Cr | Zn | Ti | Other |
| Surplus | 7.28 | 1.20 | 0.38 | 0.021 | 0.013 | 0.0031 | 0.013 | ≤0.1 |
Embodiment 1
The Al-5%B master alloy of 50% and the Al-30%Mn master alloy of 50% is weighed, through 200 DEG C of preheatings 60 minutes by sial secondary aluminum quality 1.5%; After heating sial secondary aluminum to 400 DEG C, be incubated 15 minutes, then be warming up to 700 DEG C; After aluminium liquid all melts in crucible, master alloy is added in aluminium liquid, slowly stir melt by titanium matter stirring rod, after master alloy fusing, leave standstill 1 hour; During casting, mould being fixed on vibrational frequency is 10Hz, and amplitude is on the shaking table of 10cm, and whole casting, cooling all complete under vibration condition.
After deironing process, foundry goods metallographic structure finds no dentrite, and Fe-riched phase mainly in Polygons and netted two kinds of forms, is shown in Fig. 1 and Fig. 2.In Polygons Fe-riched phase, the atomic ratio of Mn/Fe is about 4:1, and in reticulate pattern Fe-riched phase, the atomic ratio of Mn/Fe is about 2:1.
Embodiment 2
The Al-5%B master alloy of 60% and the Al-60%Mn master alloy of 40% is weighed, through 180 DEG C of preheatings 45 minutes by sial secondary aluminum quality 1.0%; After heating sial secondary aluminum to 400 DEG C, be incubated 25 minutes, then be warming up to 700 DEG C; After aluminium liquid all melts in crucible, master alloy is added in aluminium liquid, slowly stir melt by titanium matter stirring rod, after master alloy fusing, leave standstill 1.5 hours; During casting, mould being fixed on vibrational frequency is 20Hz, and amplitude is on the shaking table of 10cm, and whole casting, cooling all complete under vibration condition.
Embodiment 3
The Al-3%B master alloy of 70% and the Al-70%Mn master alloy of 30% is weighed, through 220 DEG C of preheatings 20 minutes by sial secondary aluminum quality 0.5%; After heating sial secondary aluminum to 400 DEG C, be incubated 25 minutes, then be warming up to 700 DEG C; After aluminium liquid all melts in crucible, master alloy is added in aluminium liquid, slowly stir melt by titanium matter stirring rod, after master alloy fusing, leave standstill 0.5 hour; During casting, mould being fixed on vibrational frequency is 30Hz, and amplitude is on the shaking table of 5cm, and whole casting, cooling all complete under vibration condition.
Embodiment 4
The Al-10%B master alloy of 70% and the Al-10%Mn master alloy of 30% is weighed, through 150 DEG C of preheatings 60 minutes by sial secondary aluminum quality 2.0%; After heating sial secondary aluminum to 400 DEG C, be incubated 30 minutes, then be warming up to 700 DEG C; After aluminium liquid all melts in crucible, master alloy is added in aluminium liquid, slowly stir melt by titanium matter stirring rod, after master alloy fusing, leave standstill 3.0 hours; During casting, mould being fixed on vibrational frequency is 40Hz, and amplitude is on the shaking table of 5cm, and whole casting, cooling all complete under vibration condition.
The iron-holder of embodiment 1 ~ 4 and sial secondary aluminum, tensile strength and unit elongation contrast in table 2.
The iron-holder of table 2 embodiment 1 ~ 4 and silicon secondary aluminum, tensile strength and unit elongation contrast
Claims (3)
1. the method for removing iron of a secondary aluminum, it is characterized in that step is as follows: (1) Al-B master alloy by sial secondary aluminum quality 0.5 ~ 2% and the mixture of Al-Mn master alloy, described mixture was quality 50 ~ 70%Al-B master alloy and 30 ~ 50%Al-Mn master alloy, through 150 ~ 250 DEG C of preheatings 30 ~ 60 minutes; (2) to heat after sial secondary aluminum to 400 DEG C insulation 10 ~ 30 minutes, then be warming up to 700 DEG C; (3) after the fusing of sial secondary aluminum, add above-mentioned master alloy, slowly stir, after master alloy fusing, leave standstill 0.5 ~ 4 hour; (4) during casting, mould is fixed on the shaking table of frequency 10 ~ 40Hz, amplitude 5 ~ 10cm, casting and cooling under mechanical vibration.
2. the method for removing iron of secondary aluminum according to claim 1, is characterized in that the massfraction of described Al-B master alloy B is 1 ~ 10%.
3. the method for removing iron of secondary aluminum according to claim 1, is characterized in that the massfraction of described Al-Mn master alloy Mn is 10 ~ 70%.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103966472B (en) * | 2014-05-14 | 2016-08-24 | 南昌大学 | A kind of method of Iron Removal from Secondary Aluminum Alloy |
| CN104087771B (en) * | 2014-07-11 | 2016-02-03 | 山东大学 | A kind of method preparing Magnesium-aluminum alloys |
| CN106591583B (en) * | 2016-12-16 | 2018-06-05 | 中北大学 | A kind of useless miscellaneous aluminum melt regeneration is except the method for iron |
| CN107385257B (en) * | 2017-06-15 | 2018-12-11 | 中北大学 | A kind of method that secondary aluminium alloy Fe-riched phase is rotten |
| CN107794390B (en) * | 2017-09-25 | 2019-04-26 | 浙江工业大学 | Regenerate Al-Si line aluminium alloy method for removing iron |
| CN108118170A (en) * | 2018-01-19 | 2018-06-05 | 广东省材料与加工研究所 | A kind of aluminium-chromium-boron intermediate alloy and preparation method thereof |
| CN108034845A (en) * | 2018-01-19 | 2018-05-15 | 广东省材料与加工研究所 | A kind of aluminium-cobalt-boron intermediate alloy and preparation method thereof |
| CN108193063A (en) * | 2018-01-19 | 2018-06-22 | 广东省材料与加工研究所 | A kind of aluminium-manganese-boron intermediate alloy and preparation method thereof |
| CN108893662B (en) * | 2018-08-01 | 2020-01-24 | 广东省材料与加工研究所 | High-wear-resistance regenerated aluminum alloy and preparation method and application thereof |
| CN111254303B (en) * | 2020-03-26 | 2021-04-20 | 广东省材料与加工研究所 | Method for improving morphology of iron-rich phase in secondary aluminum and reducing iron |
| CN113215455B (en) * | 2021-05-11 | 2022-10-04 | 苏州菲姆卡金属科技有限公司 | High-quality secondary aluminum and preparation method thereof |
| CN114231771B (en) * | 2021-12-17 | 2022-09-06 | 安徽百圣鑫金属科技有限公司 | High-performance aluminum alloy prepared by using recycled aluminum and preparation method |
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| GB883431A (en) * | 1960-07-28 | 1961-11-29 | Kawecki Chemical Company | Improvements in aluminium-base alloys |
| CN102051492A (en) * | 2010-11-30 | 2011-05-11 | 中原工学院 | Method for removing iron impurity from magnesium alloy by using Al-B intermediate alloy |
| CN103255306A (en) * | 2013-05-17 | 2013-08-21 | 山东创新金属科技股份有限公司 | Composite iron-removing technology of secondary aluminum |
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- 2013-11-07 CN CN201310545026.XA patent/CN103572080B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB883431A (en) * | 1960-07-28 | 1961-11-29 | Kawecki Chemical Company | Improvements in aluminium-base alloys |
| CN102051492A (en) * | 2010-11-30 | 2011-05-11 | 中原工学院 | Method for removing iron impurity from magnesium alloy by using Al-B intermediate alloy |
| CN103255306A (en) * | 2013-05-17 | 2013-08-21 | 山东创新金属科技股份有限公司 | Composite iron-removing technology of secondary aluminum |
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Address after: 510651 No. 363, Changxin Road, Guangzhou, Guangdong, Tianhe District Patentee after: Institute of materials and processing, Guangdong Academy of Sciences Address before: 510651 No. 363, Changxin Road, Guangzhou, Guangdong, Tianhe District Patentee before: Guangdong Institute Of Materials And Processing |
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Effective date of registration: 20220916 Address after: 510651 No. 363, Changxin Road, Guangzhou, Guangdong, Tianhe District Patentee after: Institute of new materials, Guangdong Academy of Sciences Address before: 510651 No. 363, Changxin Road, Guangzhou, Guangdong, Tianhe District Patentee before: Institute of materials and processing, Guangdong Academy of Sciences |