CN109402423A - A method of reducing aluminium scrap remelting refining nocuousness waste residue - Google Patents
A method of reducing aluminium scrap remelting refining nocuousness waste residue Download PDFInfo
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- CN109402423A CN109402423A CN201811449029.2A CN201811449029A CN109402423A CN 109402423 A CN109402423 A CN 109402423A CN 201811449029 A CN201811449029 A CN 201811449029A CN 109402423 A CN109402423 A CN 109402423A
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- refining
- waste residue
- nocuousness
- refining agent
- sodium chloride
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of methods for reducing aluminium scrap remelting refining nocuousness waste residue, include the following steps, the miscellaneous aluminium that will give up carries out in refuse and refining process, and a kind of floride-free salt made from earth containing a comparatively high percentage of sodium chloride base refining agent is added；The floride-free salt made from earth containing a comparatively high percentage of sodium chloride base refining agent is to be blown into aluminum melt by seamless steel pipe using high pure nitrogen, and blown twice in smelting furnace；After melt is skimmed, stood, casting obtains cast ingot product.The blowing seamless steel pipe, coats a kind of inorganic high-temp glue in its front end tightly before blowing, increases iron to reduce melt.When producing the alusil alloys die casting ingots such as ADC12 with miscellaneous aluminium remelting of giving up, using method of the invention, harmful waste residue can be greatly reduced, or even prevent fluorine-containing harmful waste residue, reduce environmental protection pressure, while improving secondary aluminium Ingot quality, have a good application prospect.
Description
Technical field
The invention belongs to aluminium alloy smelting technical fields, and in particular to a kind of side for reducing aluminium scrap remelting refining nocuousness waste residue
Method.
Background technique
Aluminium and aluminium alloy are widely used in the various fields of national economy already, when end product service life terminates
Afterwards, necessarily lead to a large amount of aluminium scraps.The recycling and regeneration of aluminium and aluminium alloy, are one of main sources of bauxite resource, it has also become
The important link of aluminum fabrication industry chain.Many enterprises of the regeneration industry of China's aluminium scrap at present, due to general lack of precision
Instrument and equipment fails that aluminium scrap is finely sorted and classified, and is typically only capable to that the conjunction of the die casting aluminiums such as ADC12 will be prepared into after its remelting
Ingot is achieved in degradation regeneration.Since aluminium scrap product surface usually did coating or oxidation processes, in addition mixing is tight
Again, impurity content is very high when remelting, it is necessary to carry out reinforcing refining, just can guarantee the metallurgical quality of die casting aluminium ingot.
Currently, the production of China's alusil alloy die casting ingot, usually carries out remelting for aluminium scrap, villiaumite is then added using villaumite
Refining agent is done, nitrogen and refining agent are blown into aluminum melt by steel pipe, realizes that the degasification of aluminum melt is removed slag, then through cast molding.?
Necessarily lead to a large amount of smelting wastes during this.Due to containing higher villiaumite in common refining agent, so in these waste residues
Necessarily contain fluoride.These fluorides are environmentally harmful substances, therefore the waste residue that remelting refining generates belongs to harmful give up
Slag makes aluminium silicon die casting ingot manufacturing enterprise bear very high environmental protection pressure and Solid state fermentation cost.Therefore, research and development reduce aluminium scrap
Harmful waste residue of remelting refining, the feasible method of especially fluorine-containing harmful waste residue, is the important difficulty that aluminium processing industry faces at present
Topic.
Summary of the invention
The present invention leads to the problem of a large amount of fluorine-containing harmful waste residues when regenerating aiming at aluminium scrap in current industry, provide one kind
The method for reducing aluminium scrap remelting refining nocuousness waste residue.This method can not only reduce harm of the smelting waste to environment, Er Qieke
To effectively improve metal recovery utilization rate and product quality.
To achieve the goals above, the technical solution adopted in the present invention is as follows:
A method of reducing aluminium scrap remelting refining nocuousness waste residue, comprising the following steps:
Step 1: by recycling and the well-graded raw materials such as miscellaneous aluminium, commercial-purity aluminium, silicea that give up, by ratio as defined in alloy designations
Example ingredient, is then added remelting in gas furnace by defined sequence；
Step 2: after raw material is completely melt and is suitably stirred, using high pure nitrogen by seamless steel pipe by a kind of nothing
Fluorine salt made from earth containing a comparatively high percentage of sodium chloride base refining agent is blown into aluminum melt and carries out first time refining, and refining time is 15-20 minutes；Refining agent is blown flow
2.0-2.5kg/min。
Step 3: after skimming to the aluminum melt after initial refining, 10-30 minutes are stood, then be blown into nitrogen with injection tube
Gas and floride-free salt made from earth containing a comparatively high percentage of sodium chloride base refining agent carry out second and refine, and refining time is 15-20 minutes；It is 2.0- that refining agent, which is blown flow,
2.5kg/min。
Step 4: after skimming to the aluminum melt after double refining, 20-30 minutes are stood；Then starting casting machine into
Row casting, obtains Al-Si alloy ingots.
A kind of method reducing aluminium scrap remelting refining nocuousness waste residue of the present invention, which is characterized in that the free-floride nitre
Alkali refining agent, additional amount is the 0.10-0.15% of molten aluminum quality when refining for the first time, and additional amount is molten aluminum when refining for the second time
The 0.10% of quality.The free-floride salt made from earth containing a comparatively high percentage of sodium chloride base refining agent, is made of according to mass percent meter following components: sodium nitrate 30%,
Potassium nitrate 35%, active carbon 5%, magnesium chloride 5%, calcium chloride 5%, carbon trichloride 5%, potassium chloride 10%, sodium chloride 5%.Institute
The purity for stating high pure nitrogen reaches 99.99% or more, and -70 DEG C of dew point or less.The front end of blowing seamless steel pipe (is stretched before refining
Enter one end of aluminum melt) surfaces externally and internally coated with a kind of inorganic high-temp glue it is tight.The inorganic high-temp glue is commercially available DB5010
One pack system high temperature inorganic glue；Coating and curing operation are executed by the product operation instruction.
Compared with prior art, the invention has the following advantages that (1) is effectively reduced using a kind of floride-free salt made from earth containing a comparatively high percentage of sodium chloride base refining agent
Harmful waste residue.Present invention employs a kind of based on nitrate, the appropriate environment-friendly type for matching villaumite and carbon is without fluorine refining agent.High temperature
Lower nitrate is reacted with carbon generates nitrogen and carbon dioxide gas, by impurity and gas when these gases float in aluminum melt
(mainly hydrogen) takes melt out of, and the degasification for being achieved in aluminum melt is removed slag.Add villaumite and active carbon in refining agent and be in order to
Enhance the adsorption capacity to bubble and impurity, improves refining effect, and suitably reduce reaction speed.(2) high pure nitrogen two is used
Refining effect is strengthened in secondary blowing.By improving the purity of nitrogen, the especially oxygen and moisture in reduction nitrogen, to reduce molten
Oxide inclusion in body.Before the present invention, enterprise generally carries out a blowing refining, and refining agent additional amount is about aluminum melt matter
The 0.20~0.25% of amount.Most of refining agent component finally all becomes smelting waste, therefore the refining agent being added is more, slag
Also more.The present invention uses the thinking of " multi-purpose nitrogen uses salt less ", in the comparable situation of refining agent overall consumption, by twice
Blowing refining guarantees melt refining effect, controls slag total amount.Before the present invention, only through a blowing refining, generation is melted
Refining waste residue melt about per ton is 13.5kg, after applying the present invention through blowing refining twice, the smelting waste for generation of skimming twice
Melt about per ton is 15.0kg.Although overall waste residue amount increased, what is generated is floride-free harmless waste residue.These are useless
Aluminum content is higher in slag, subsequent to carry out smart stir-fry again, and aluminium therein is carried out depth recycling.Waste residue (two secondary aluminiums after essence stir-fry
Ash) because not fluorine-containing, the raw material for being also used as other industries carries out regeneration.(3) jet is coated using inorganic high-temp glue
Steel pipe avoids melt from increasing iron, guarantees that aluminium silicon presses ingot quality.Blowing refining twice is carried out under high temperature, necessarily increases air blowing steel pipe
The degree of ablation, for this purpose, the present invention is resistant to 1200 DEG C of high temperature inorganic glue to going deep into inside and outside the steel pipe of melt one end using a kind of
Surface is tightly coated, and to reduce ablation of the steel pipe in aluminum melt, prevents melt from increasing iron, while improving the use longevity of steel pipe
Life.
Specific embodiment
Below with reference to specific example, the present invention will be further described.
Embodiment 1
A method of reducing aluminium scrap remelting refining nocuousness waste residue, comprising the following steps:
Step 1: recycling is given up 20 tons of the raw materials such as miscellaneous aluminium, commercial-purity aluminium, silicea with well-graded, by ADC12 alloy designations
Then remelting in gas furnace is added by defined sequence in defined ratio ingredient；
Step 2: after raw material is completely melt and is suitably stirred, using high pure nitrogen by seamless steel pipe by a kind of nothing
Fluorine salt made from earth containing a comparatively high percentage of sodium chloride base refining agent, which is blown into aluminum melt, to carry out first time degasification and removes slag refining, and refining time is 10-15 minutes, and refining agent is blown
Flow is 2.0-2.5kg/min.
Step 3: after skimming to the aluminum melt after initial refining, 10-30 minutes are stood, then be blown into nitrogen with injection tube
Gas and floride-free salt made from earth containing a comparatively high percentage of sodium chloride base refining agent carry out second and refine, and refining time is 10-20 minutes, and it is 2.0- that refining agent, which is blown flow,
2.5kg/min。
Step 4: after skimming to the aluminum melt after double refining, 20-30 minutes are stood；Then starting casting machine into
Row casting, obtains Al-Si alloy ingots.
The floride-free salt made from earth containing a comparatively high percentage of sodium chloride base refining agent additional amount of step 2 is the 0.15% of molten aluminum quality, free-floride described in step 3
Salt made from earth containing a comparatively high percentage of sodium chloride base refining agent additional amount is the 0.10% of molten aluminum quality.
It is made of according to mass percent meter following components described in step 2 and step 3 without fluorine refining agent: sodium nitrate
30%, potassium nitrate 35%, active carbon 5%, magnesium chloride 5%, calcium chloride 5%, carbon trichloride 5%, potassium chloride 10%, sodium chloride
5%.
The purity of high pure nitrogen described in step 2 and step 3 reaches 99.99% or more, and dew point is at -70 DEG C or less.
Before refining, by the interior of blowing seamless steel pipe front end (one end for protruding into aluminum melt) described in step 2 and step 3
A kind of inorganic high-temp glue in outer surface coats tight.The inorganic high-temp glue is commercially available DB5010 one pack system high temperature inorganic glue；It applies
It covers and is executed with curing operation by the product operation instruction.
Embodiment 2-3
The pilot production of other die casting ingots is carried out using method same as Example 1, unlike: the examination life of embodiment 2
The product of production is ADC10 die casting ingot, and the product that embodiment 3 is produced as a trial is ADC14 die casting ingot.
Comparative example 1
Difference with embodiment 1 is only that floride-free salt made from earth containing a comparatively high percentage of sodium chloride base refining agent additional amount described in step 2 and step 3 is more,
It is the 0.2% of molten aluminum quality, remaining technique is identical.
Comparative example 2
Difference with embodiment 1 is only that floride-free salt made from earth containing a comparatively high percentage of sodium chloride base refining agent additional amount described in step 2 and step 3 is less,
It is the 0.05% of molten aluminum quality, remaining technique is identical.
Comparative example 3
Difference with embodiment 1 is only that floride-free salt made from earth containing a comparatively high percentage of sodium chloride base refining agent additional amount described in step 2 is molten aluminum quality
0.25%, 10-15 minutes are stood after skimming, does not carry out second of refining treatment；Remaining technique is identical.
Comparative example 4
Difference with embodiment 1 is only that refining agent described in step 2 and step 3 is changed to containing fluorine refining agent, the refining
Agent is composed of the following components by weight percent: potassium chloride 47%, sodium chloride 30%, ice crystal 23% (anhydrous cryolite)；
Remaining technique is identical.
Comparative example 5
Difference with embodiment 1 is only that, the purity of nitrogen described in step 2 and step 3 is 99.95%, -30 DEG C of dew point
Hereinafter, remaining technique is identical.
Comparative example 6
Difference with embodiment 1 is only that the blowing described in step 2 and step 3 is not made any of seamless steel pipe
Surface layer protective treatment, remaining technique are identical.
The test result of embodiment 1-3 and comparative example 1-6 are listed as follows:
1 embodiment and comparative example test result list of table
From upper watch test data:
The additional amount of floride-free salt made from earth containing a comparatively high percentage of sodium chloride base refining agent will affect the waste residue amount and cast ingot product quality generated in reflow process,
Refining agent is more, and waste residue amount also will increase, but the defect that ingot casting generates accordingly is reduced；
Although can guarantee product quality using containing fluorine refining agent, fluorine-containing harmful slag can be generated, to human body and environment
It can damage；
The purity of nitrogen also has certain influence to the quality of product, and purity is higher, and oxygen content and aqueous component are reduced, can be with
The oxide content and gas hole defect of cast ingot product are reduced, product quality is improved；
The iron content of cast ingot product can be reduced by doing spray treatment with inorganic high-temp glue with seamless steel pipe surfaces externally and internally to blowing
Amount, while significantly improving steel pipe service life.
In short, the present invention blows to strengthen aluminium scrap using a kind of environment-friendly type free-floride salt made from earth containing a comparatively high percentage of sodium chloride base refining agent, high pure nitrogen twice
Remelting refining is all floride-free harmless waste residue, and can be recycled and recycle although will increase a small amount of smelting waste；Using inorganic
The method that high-temp glue coats jet steel pipe can increase iron to avoid melt, while improve the service life of injection tube.Using side of the invention
Method can the superior in quality a variety of alusil alloy die casting ingots of steady production.
Claims (5)
1. a kind of method for reducing aluminium scrap remelting refining nocuousness waste residue, which comprises the following steps:
Step 1: will recycling and the well-graded miscellaneous aluminium that gives up, commercial-purity aluminium, silicea raw material, in ratio ingredient as defined in alloy designations,
Then remelting in gas furnace is added by defined sequence；
Step 2: after raw material is completely melt and is suitably stirred, using high pure nitrogen by seamless steel pipe by a kind of floride-free nitre
Alkali refining agent is blown into aluminum melt and carries out first time refining, and refining time is 15-20 minutes；It is 2.0- that refining agent, which is blown flow,
2.5kg/min。
Step 3: after skimming to the aluminum melt after initial refining, stand 10-30 minute, then with injection tube be blown into nitrogen with
Floride-free salt made from earth containing a comparatively high percentage of sodium chloride base refining agent carries out second and refines, and refining time is 15-20 minutes；It is 2.0-2.5kg/ that refining agent, which is blown flow,
min。
Step 4: after skimming to the aluminum melt after double refining, 20-30 minutes are stood；Then starting casting machine is poured
Casting, obtains Al-Si alloy ingots.
2. a kind of method for reducing aluminium scrap remelting refining nocuousness waste residue according to claim 1, which is characterized in that the nothing
Fluorine salt made from earth containing a comparatively high percentage of sodium chloride base refining agent, additional amount is the 0.10-0.15% of molten aluminum quality when refining for the first time, and additional amount is when refining for the second time
The 0.10% of molten aluminum quality.
3. a kind of method for reducing aluminium scrap remelting refining nocuousness waste residue according to claim 1, which is characterized in that the nothing
Fluorine salt made from earth containing a comparatively high percentage of sodium chloride base refining agent is made of according to mass percent meter following components: sodium nitrate 30%, potassium nitrate 35%, active carbon
5%, magnesium chloride 5%, calcium chloride 5%, carbon trichloride 5%, potassium chloride 10%, sodium chloride 5%.
4. a kind of method for reducing aluminium scrap remelting refining nocuousness waste residue according to claim 1, which is characterized in that step 2
Reach 99.99% or more with the purity of high pure nitrogen described in step 3, -70 DEG C of dew point or less.
5. a kind of method for reducing aluminium scrap remelting refining nocuousness waste residue according to claim 1, which is characterized in that before refining
A kind of inorganic high-temp glue of the surfaces externally and internally of one end for protruding into aluminum melt of blowing seamless steel pipe is coated tight.It is described inorganic
High-temp glue is DB5010 one pack system high temperature inorganic glue.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811449029.2A CN109402423B (en) | 2018-11-29 | 2018-11-29 | Method for reducing harmful waste residues generated in remelting and refining waste aluminum |
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| CN201811449029.2A CN109402423B (en) | 2018-11-29 | 2018-11-29 | Method for reducing harmful waste residues generated in remelting and refining waste aluminum |
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| CN109402423A true CN109402423A (en) | 2019-03-01 |
| CN109402423B CN109402423B (en) | 2019-12-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115976352A (en) * | 2023-02-14 | 2023-04-18 | 湖南中创空天新材料股份有限公司 | Method for preparing wrought aluminum alloy by utilizing recycled aluminum |
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| CN105483403A (en) * | 2015-11-27 | 2016-04-13 | 贵州航天风华精密设备有限公司 | Aluminum alloy smelting method |
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| CN106498216A (en) * | 2016-12-05 | 2017-03-15 | 沈阳航空航天大学 | A kind of preparation method of villaumite fusion refining agent |
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2018
- 2018-11-29 CN CN201811449029.2A patent/CN109402423B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61130430A (en) * | 1984-11-28 | 1986-06-18 | Kobe Steel Ltd | Cleaning method of molten al or al alloy refined by gaseous chlorine |
| WO1997008350A1 (en) * | 1995-08-25 | 1997-03-06 | Aikoh Co., Ltd. | Component additive for aluminum alloy |
| JP2003231927A (en) * | 2001-12-07 | 2003-08-19 | Kobe Steel Ltd | Method for smelting molten aluminum alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115976352A (en) * | 2023-02-14 | 2023-04-18 | 湖南中创空天新材料股份有限公司 | Method for preparing wrought aluminum alloy by utilizing recycled aluminum |
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Denomination of invention: A method for reducing harmful waste residue in remelting refining of waste aluminum Effective date of registration: 20220531 Granted publication date: 20191227 Pledgee: Yujiang branch of the Industrial Commercial Bank of China Ltd. Pledgor: JIANGXI BAOTAI NON-FERROUS METAL GROUP Co.,Ltd. Registration number: Y2022980006723 |