CN103966472A - Method for removing iron in regenerated aluminum alloy - Google Patents

Method for removing iron in regenerated aluminum alloy Download PDF

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Publication number
CN103966472A
CN103966472A CN201410202503.7A CN201410202503A CN103966472A CN 103966472 A CN103966472 A CN 103966472A CN 201410202503 A CN201410202503 A CN 201410202503A CN 103966472 A CN103966472 A CN 103966472A
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borax
refining agent
aluminum alloy
insulation
temperature
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CN103966472B (en
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杨湘杰
易光斌
郭洪明
王言兵
龚兆汉
丁良生
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Shunbo Aluminum Alloy Hubei Co ltd
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Nanchang University
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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
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    • Y02P10/20—Recycling

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Abstract

The invention discloses a method for removing iron in regenerated aluminum alloy. The method comprises the steps of firstly, respectively grinding a refining agent and borax, weighting 0.15-0.25% of refining agent and 0.2-0.8% of borax according to the mass percentage of aluminum alloy to be treated, respectively wrapping refining agent and borax by using aluminum foil paper, placing the wrapped refining agent and borax into a drying oven, heating to 200-250 DEG C, and preserving the heat for 2-3h; slagging off when the aluminum alloy is molten, pressing refining agent by using a bell jar when the temperature of the molten aluminum alloy is up to 720-740 DEG C, and slagging off after preserving the heat for 5-10min; pressing borax when the temperature of the molten aluminum alloy is up to 680-760 DEG C, and slagging off when the reaction is ended; preserving the heat and standing for 30-90min, and air-cooling. The method disclosed by the invention is simple, easy to control, good in chemical stability of a solvent and low in harmful gas content.

Description

A kind of method of Iron Removal from Secondary Aluminum Alloy
Technical field
The invention belongs to Iron Removal from Secondary Aluminum Alloy technical field.
Background technology
Secondary aluminum has huge potentiality and advantage aspect energy efficient, but impurity element in alloy can produce impact in various degree to the performance of material, wherein obvious with the effect of iron, and in most of the cases, the existence of iron is harmful to the performance of aluminium alloy.In national standard, generally the Fe amount that contains cast aluminium alloy is limited to below 0.7wt%, and in high strength cast aluminum alloys, is limited to below 0.35wt% containing Fe amount both at home and abroad.And boron comes from the research on electrical conductivity of industrial aluminum impact to the purification phenomenon of transition element in aluminium.Boron can be converted into from solid solution state detrimental impurity Ti, the Cr, Fe, the Zr that in fine aluminium, affect electroconductibility electroconductibility is endangered to the less state of separating out, and forms TiB 2, CrB 2, FeB 2, ZrB 2precipitate, they can be deposited to crucible bottom much larger than aluminium liquid because of the density of himself.
Because the solubleness of iron in solid aluminum is very low, nearly all ferro element all exists with the form of secondary phase, and faller gill shape iron isolates matrix mutually, causes stress concentration; And in process of setting, can block interdendritic Feeding channel, thereby increase porosity.If will fundamentally solve the high problem of iron level in secondary aluminium alloy, must greatly develop effective iron removal technology, main method has settling methods, centrifugal method, electromagnetic separation process, the flux method etc. removed at present.But centrifugation, to Charge Treatment inconvenient operation in enormous quantities, can not be processed continuously, and furnace charge waste is serious, is applied to production reality and still needs larger improvement; Electromagnetic separation process cost is too high, in conjunction with the not only effectively deironing but also operation is simple and feasible of settling methods and flux method, is easy to control.
Summary of the invention
The object of the present invention is to provide a kind of method of Iron Removal from Secondary Aluminum Alloy, easy to use, with low cost, operating procedure is simple, is easy to control, and can in secondary aluminum melt, react strongly rapidly, and the ferro element of capturing in melt is assembled and precipitates, good iron removal effect.
The present invention is achieved by the following technical solutions.
A kind of Iron Removal from Secondary Aluminum Alloy method of the present invention, its process is: first refining agent, borax are ground respectively, take the refining agent of 0.15-0.25% and the borax of 0.2%-0.8% by the mass percent of pending aluminium alloy, encase and put into baking oven with aluminium-foil paper respectively, be warmed up to 200 DEG C-250 DEG C, insulation 2-3h.Treat that aluminum alloy melting skims, in the time of 720 DEG C-740 DEG C of molten aluminium alloy temperature, be pressed into refining agent with bell jar, after insulation 5-10min, skim; In the time of 680 DEG C-760 DEG C of molten aluminium alloy temperature, be pressed into after borax question response completes and skim; Insulation leaves standstill 30-90min, treats its air cooling.
The preferred mass per-cent of borax of the present invention is 0.4%-0.6%.
It is 700 DEG C-740 DEG C, soaking time 30min-70min that borax of the present invention adds fashionable preferred temperature of reaction.
The present invention adopts inductively coupled plasma atomic emission spectrometer to carry out chemical composition analysis to sample.
Method of the present invention is simple, is easy to control, and flux chemical stability is good, and obnoxious flavour amount is few.In crucible, the ferro element reaction in borax meeting and molten aluminium forms the larger boronized iron of density, in the standing process of insulation, precipitates, and can effectively reduce the content of the iron in secondary aluminium alloy.
Embodiment
The present invention will be described further by following examples.
Following examples refining agent used is the refining agent that Foshan metal supplementary material company limited produces, and its composition is: the C of 20%-22% 2cl 6, 30%-35% KCl, the Na of 10%-15% of NaCl, 20%-25% 2siF 6, 5%-10% NaF.
Embodiment 1.
After refining agent, borax are ground respectively, accurately take 0.15% refining agent and 0.2% borax, encase and put into baking oven and be warmed up to 250 DEG C, insulation 2h with aluminium-foil paper respectively.Treat that secondary aluminium alloy fusing skims, temperature of aluminum liquid, in the time of 720 DEG C, is pressed into refining agent with bell jar, after insulation 10min, skims, and skim after being incubated 10min, then insulation leaves standstill 30min and treats its air cooling after the temperature that records aluminium liquid is pressed into borax in the time of 680 DEG C.Record deironing rate 5.08%.
Embodiment 2.
After refining agent, borax are ground respectively, accurately take 0.2% refining agent and 0.5% borax, encase and put into baking oven and be warmed up to 200 DEG C, insulation 2.5h with aluminium-foil paper respectively.Treat that secondary aluminium alloy fusing skims, temperature of aluminum liquid, in the time of 730 DEG C, is pressed into refining agent with bell jar, after insulation 10min, skims, and skim after being incubated 10min, then insulation leaves standstill 60min and treats its air cooling after the temperature that records aluminium liquid is pressed into borax in the time of 680 DEG C.Record deironing rate 5.79%.
Embodiment 3.
After refining agent, borax are ground respectively, accurately take 0.25% refining agent and 0.8% borax, encase and put into baking oven and be warmed up to 250 DEG C, insulation 3h with aluminium-foil paper respectively.Treat that secondary aluminium alloy fusing skims, temperature of aluminum liquid, in the time of 740 DEG C, is pressed into refining agent with bell jar, after insulation 10min, skims, and skim after being incubated 10min, then insulation leaves standstill 90min and treats its air cooling after the temperature that records aluminium liquid is pressed into borax in the time of 680 DEG C.Record deironing rate 4.87%.
Embodiment 4.
After refining agent, borax are ground respectively, accurately take 0.15% refining agent and 0.5% borax, encase and put into baking oven and be warmed up to 200 DEG C, insulation 2h with aluminium-foil paper respectively.Treat that secondary aluminium alloy fusing skims, temperature of aluminum liquid, in the time of 720 DEG C, is pressed into refining agent with bell jar, after insulation 10min, skims, and skim after being incubated 10min, then insulation leaves standstill 30min and treats its air cooling after the temperature that records aluminium liquid is pressed into borax in the time of 720 DEG C.Record deironing rate 7.57%.
Embodiment 5.
After refining agent, borax are ground respectively, accurately take 0.2% refining agent and 0.8% borax, encase and put into baking oven and be warmed up to 250 DEG C, insulation 2.5h with aluminium-foil paper respectively.Treat that secondary aluminium alloy fusing skims, temperature of aluminum liquid, in the time of 730 DEG C, is pressed into refining agent with bell jar, after insulation 10min, skims, and skim after being incubated 10min, then insulation leaves standstill 60min and treats its air cooling after the temperature that records aluminium liquid is pressed into borax in the time of 720 DEG C.Record deironing rate 5.12%.
Embodiment 6.
After refining agent, borax are ground respectively, accurately take 0.25% refining agent and 0.2% borax, encase and put into baking oven and be warmed up to 200 DEG C, insulation 3h with aluminium-foil paper respectively.Treat that secondary aluminium alloy fusing skims, temperature of aluminum liquid, in the time of 740 DEG C, is pressed into refining agent with bell jar, after insulation 10min, skims, and skim after being incubated 10min, then insulation leaves standstill 90min and treats its air cooling after the temperature that records aluminium liquid is pressed into borax in the time of 720 DEG C.Record deironing rate 6.4%.
Embodiment 7.
After refining agent, borax are ground respectively, accurately take 0.15% refining agent and 0.8% borax, encase and put into baking oven and be warmed up to 250 DEG C, insulation 2h with aluminium-foil paper respectively.Treat that secondary aluminium alloy fusing skims, temperature of aluminum liquid, in the time of 720 DEG C, is pressed into refining agent with bell jar, after insulation 10min, skims, and skim after being incubated 10min, then insulation leaves standstill 30min and treats its air cooling after the temperature that records aluminium liquid is pressed into borax in the time of 760 DEG C.Record deironing rate 5.88%.
Embodiment 8.
After refining agent, borax are ground respectively, accurately take 0.2% refining agent and 0.2% borax, encase and put into baking oven and be warmed up to 200 DEG C, insulation 2.5h with aluminium-foil paper respectively.Treat that secondary aluminium alloy fusing skims, temperature of aluminum liquid, in the time of 730 DEG C, is pressed into refining agent with bell jar, after insulation 10min, skims, and skim after being incubated 10min, then insulation leaves standstill 60min and treats its air cooling after the temperature that records aluminium liquid is pressed into borax in the time of 760 DEG C.Record deironing rate 6.16%.
Embodiment 9.
After refining agent, borax are ground respectively, accurately take 0.25% refining agent and 0.5% borax, encase and put into baking oven and be warmed up to 250 with aluminium-foil paper respectively 0c, insulation 3h.Treat that secondary aluminium alloy fusing skims, temperature of aluminum liquid is 740 0when C, be pressed into refining agent with bell jar, after insulation 10min, skim, record the temperature of aluminium liquid 760 0when C, be pressed into after being incubated 10min after borax and skim, then insulation leaves standstill 90min and treats its air cooling.Record deironing rate 6.35%.

Claims (3)

1. the method for an Iron Removal from Secondary Aluminum Alloy, it is characterized in that first refining agent, borax being ground respectively, take the refining agent of 0.15-0.25% and the borax of 0.2%-0.8% by the mass percent of pending aluminium alloy, encase and put into baking oven with aluminium-foil paper respectively, be warmed up to 200 DEG C-250 DEG C, insulation 2-3h; Treat that aluminum alloy melting skims, in the time of 720 DEG C-740 DEG C of molten aluminium alloy temperature, be pressed into refining agent with bell jar, after insulation 5-10min, skim; In the time of 680 DEG C-760 DEG C of molten aluminium alloy temperature, be pressed into after borax question response completes and skim; Insulation leaves standstill 30-90min, treats its air cooling.
2. method according to claim 1, is characterized in that the mass percent of described borax is 0.4%-0.6%.
3. method according to claim 1, is characterized in that it is 700 DEG C-740 DEG C, soaking time 30min-70min that borax adds fashionable temperature.
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104357692A (en) * 2014-11-15 2015-02-18 安徽省新方尊铸造科技有限公司 Technique for producing aluminum alloy wheel hub from recycled aluminum
CN104451228A (en) * 2014-11-20 2015-03-25 安徽省新方尊铸造科技有限公司 Aluminum alloy non-toxic refining agent with iron removal effect
CN104831103A (en) * 2015-05-22 2015-08-12 北京交通大学 Aluminum alloy iron removal flux and preparation method thereof
CN107794390A (en) * 2017-09-25 2018-03-13 浙江工业大学 Regenerate Al Si line aluminium alloy method for removing iron
CN108315561A (en) * 2017-12-30 2018-07-24 安徽玉成光华铝业有限公司 Ferro element in a kind of efficient solvent method removal aluminium scrap
CN109881024A (en) * 2019-03-11 2019-06-14 北京科技大学 A kind of minimizing technology of secondary aluminium alloy non-pneumatic impurity
CN110157910A (en) * 2018-03-20 2019-08-23 肇庆新联昌金属实业有限公司 A kind of waste and old alum recovery reprocessing processing method
CN111690836A (en) * 2020-07-06 2020-09-22 湖北华力科技有限公司 Multi-effect composite refining agent for smelting aluminum scrap and preparation process thereof
CN113106282A (en) * 2021-04-09 2021-07-13 广东鸿邦金属铝业有限公司 Low-iron low-silicon aluminum liquid and preparation method and application thereof
CN113234949A (en) * 2021-05-12 2021-08-10 南昌大学 Method for preparing regenerated wrought aluminum alloy from waste aluminum alloy

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CN103572080A (en) * 2013-11-07 2014-02-12 广州有色金属研究院 Deironing method for secondary aluminum

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104357692A (en) * 2014-11-15 2015-02-18 安徽省新方尊铸造科技有限公司 Technique for producing aluminum alloy wheel hub from recycled aluminum
CN104451228A (en) * 2014-11-20 2015-03-25 安徽省新方尊铸造科技有限公司 Aluminum alloy non-toxic refining agent with iron removal effect
CN104831103A (en) * 2015-05-22 2015-08-12 北京交通大学 Aluminum alloy iron removal flux and preparation method thereof
CN107794390A (en) * 2017-09-25 2018-03-13 浙江工业大学 Regenerate Al Si line aluminium alloy method for removing iron
CN107794390B (en) * 2017-09-25 2019-04-26 浙江工业大学 Regenerate Al-Si line aluminium alloy method for removing iron
CN108315561A (en) * 2017-12-30 2018-07-24 安徽玉成光华铝业有限公司 Ferro element in a kind of efficient solvent method removal aluminium scrap
CN110157910A (en) * 2018-03-20 2019-08-23 肇庆新联昌金属实业有限公司 A kind of waste and old alum recovery reprocessing processing method
CN109881024A (en) * 2019-03-11 2019-06-14 北京科技大学 A kind of minimizing technology of secondary aluminium alloy non-pneumatic impurity
CN111690836A (en) * 2020-07-06 2020-09-22 湖北华力科技有限公司 Multi-effect composite refining agent for smelting aluminum scrap and preparation process thereof
CN113106282A (en) * 2021-04-09 2021-07-13 广东鸿邦金属铝业有限公司 Low-iron low-silicon aluminum liquid and preparation method and application thereof
CN113234949A (en) * 2021-05-12 2021-08-10 南昌大学 Method for preparing regenerated wrought aluminum alloy from waste aluminum alloy

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