CN103173643B - Novel secondary aluminum modifying refiner and method for smelting secondary aluminum by utilizing refiner - Google Patents
Novel secondary aluminum modifying refiner and method for smelting secondary aluminum by utilizing refiner Download PDFInfo
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- CN103173643B CN103173643B CN201310038971.0A CN201310038971A CN103173643B CN 103173643 B CN103173643 B CN 103173643B CN 201310038971 A CN201310038971 A CN 201310038971A CN 103173643 B CN103173643 B CN 103173643B
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Abstract
The invention relates to a novel secondary aluminum modifying refiner and a method for smelting secondary aluminum by utilizing the refiner. The method for producing the secondary alumium by utilizing the refiner specifically comprises the following steps: putting weighed industrial pure aluminum, industrial silicon and waste aluminum into a constant-temperature preheating drying furnace of 250 DEG C to dry for 2-3 hours; conveying dried raw materials into a melting furnace, and removing gas and slag after complete melting; adding 0.3wt%-0.5wt% of novel secondary aluminum modifying refiner when the temperature reaches 730-750 DEG C, fully stirring and standing, detecting and regulating the components; and (5) casting ingots when the temperature is 680-720 DEG C to prepare the secondary aluminum. The novel modifying refiner provided by the invention not only can effectively control the content of impurity elements but also can fully utilize interaction effect between the elements to realize the benefits of the impurity elements, thereby greatly reducing the relegation and regeneration cost and improving the quality and performance of the regenerated products.
Description
Technical field
The invention belongs to non-ferrous metal alloy technical field of material, relate to one to control effectively to impurity element in waste aluminum fusion process, and the interaction that can make full use of between element, realize the online treatment technology of impurity element usefulization, especially a kind of New Regenerated aluminium modifying-refining agent and utilize the method for this fining agent melting secondary aluminum.
Background technology
The aggregate consumption of whole world aluminium is about 3,500 ten thousand tons (34972kt), and wherein secondary aluminum output about 1,000 ten thousand tons (10500kt), accounts for 30% of overall consumption.Waste aluminum safeguarding grades regeneration has very important composite strategies meaning.According to industry development planning, to the year two thousand twenty, the proportion of China's secondary aluminum output shared by whole aluminium ultimate production brings up to 60% from current 21%.Only this item, 1,365 hundred million kilowatt-hours of can economizing on electricity every year, are equivalent to the average annual energy output of saving one and half Three Gorges Projects, annual water saving 9l00 ten thousand stere.
Impurity element main in waste aluminum comprises Fe, Cu, Mn, Zn, Mg etc., and impurity element is difficult to remove mostly, processes the over-all properties that bad meeting has a strong impact on aluminum alloy materials.The difficulty of waste aluminum melting regeneration is more much bigger than primary aluminum, and one of its basic reason is exactly the control of impurity element.Prior art is all reduce the method for tramp element content to ensure reconstituted product quality and performance by adding fine aluminium dilution.This method easily causes secondary aluminum cost to improve, and reduces the value of alloying element.
By retrieval, not yet find the patent document relevant to present patent application.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, a kind of method utilizing New Regenerated aluminium modifying-refining agent melting secondary aluminum that regeneration cost is low, reconstituted product quality is high, performance good, the waste aluminum rate of recovery is high is provided.
Another object of the present invention is to provide a kind of New Regenerated aluminium modifying-refining agent, fining agent utilizes rare earth element (RE) to produce useful effect to grain refining, weave construction etc. that is rotten and that improve impurity phase, realizes the transformation of impurity element to usefulization of alloying element.
The object of the invention is to be achieved through the following technical solutions:
A kind of New Regenerated aluminium modifying-refining agent, fining modifier effective constituent is: 92Al-5Ti-1B-1Ce-1La, and the massfraction scope of novel modifying-refining agent Al-Ti-B-Ce-La is: 4.5-6.5%Ti, 0.8-1.2%B, 0.6-1.4%Ce, 0.6-1.4%La, surplus is aluminium.
And the preparation method of described fining agent is:
(1) select commercial-purity aluminium, K
2tiF
6, KBF
6, AlCe10 alloy, AlLa10 alloy is as raw material;
(2) by load weighted commercial-purity aluminium, K
2tiF
6, KBF
6, AlCe10 alloy, AlLa10 alloy put into the dry 2-3 hour of constant temperature preheating and drying stove of 230-260 DEG C;
(3) in drying oven, add load weighted commercial-purity aluminium, furnace temperature 800 DEG C is set, electrified regulation;
(4), when being warming up to 800 DEG C, add load weighted K
2tiF6, KBF
6mixture, fully stirs, insulation, ensures TiAl
3, TiB
2particle is distributed in melt more uniformly;
(5) add AlCe10 alloy, AlLa10 alloy, stir, make mentioned component be uniformly distributed in melt, leave standstill, when temperature reach 730-800 DEG C skim, degasification, time 3-7 minute;
(6) cast when temperature reaches 720-750 DEG C, after the demoulding, be Al-Ti-B-Ce-La New Regenerated aluminium modifying-refining agent.
A method for New Regenerated aluminium modifying-refining agent, step is as follows:
(1) select commercial-purity aluminium, K
2tiF
6, KBF
6, AlCe10 alloy, AlLa10 alloy is as raw material;
(2) by load weighted commercial-purity aluminium, K
2tiF
6, KBF
6, AlCe10 alloy, AlLa10 alloy put into the dry 2-3 hour of constant temperature preheating and drying stove of 230-260 DEG C;
(3) in drying oven, add load weighted commercial-purity aluminium, furnace temperature 800 DEG C is set, electrified regulation;
(4), when being warming up to 800 DEG C, add load weighted K
2tiF6, KBF
6mixture, fully stirs, insulation, ensures TiAl
3, TiB
2particle is distributed in melt more uniformly;
(5) add AlCe10 alloy, AlLa10 alloy, stir, make mentioned component be uniformly distributed in melt, leave standstill, when temperature reach 730-800 DEG C skim, degasification, time 3-7 minute;
(6) cast when temperature reaches 720-750 DEG C, after the demoulding, be Al-Ti-B-Ce-La New Regenerated aluminium modifying-refining agent;
Described proportioning raw materials calculates according to target value and all can draw.
A method for melting secondary aluminum, adopts New Regenerated aluminium modifying-refining agent.
And, first prepare New Regenerated aluminium modifying-refining agent, then utilize novel modifying-refining agent to produce secondary aluminum,
Utilize the concrete grammar of novel modifying-refining agent production secondary aluminum as follows:
(1) load weighted commercial-purity aluminium, industrial silicon, waste aluminum are put into the dry 2-3 hour of constant temperature preheating and drying stove of 250 DEG C;
(2) in accumulation of heat smelting furnace, add waste aluminum, industrial silicon, commercial-purity aluminium, igniting heating;
(3) after all raw materials melt completely, measuring tempeature, when temperature reaches about 750 DEG C, adds the refining agent of gross weight 0.2%-0.25%, and adjustment nitrogen flow, carries out degasification slagging-off;
(4) when temperature reaches 730 DEG C-750 DEG C, add the New Regenerated aluminium modifying-refining agent of 0.3-0.5wt%, fully stir, leave standstill, detect composition and adjust;
(5) composition is qualified, when temperature reaches 680-720 DEG C, and casting ingot casting, obtained secondary aluminum.
Advantage of the present invention and beneficial effect are:
1, the present invention utilizes rare earth element (RE) to produce useful effect to grain refining, weave construction etc. that is rotten and that improve impurity phase, in waste aluminum fusion process, add the novel fining modifier containing trace rare-earth element, realize the transformation of impurity element to usefulization of alloying element, its tensile strength can increase 15%-20%, relative elongation increases 1.5-2.0 doubly, and the usage ratio of waste aluminum brings up to more than 80%.
The content of impurity element can not only control effectively by the novel fining modifier 2, provided in the present invention, and the interaction that can make full use of between element, realize impurity element usefulization, and then can greatly reduce safeguarding grades regeneration cost, improve reconstituted product quality and performance.
3, the present invention adopts rare earth element ce, La with the impurity element effect in aluminium liquid, can generate stable intermetallic compound (REFe
5, Al
8cu
4rE, Al
8mn
4rE etc.), these compound good heat resistances, thermostability are high, become crystallization nuclei in Dispersed precipitate containing the second-phase compound of rare earth element, improve nucleation rate, thus refinement crystal grain, the tensile strength of aluminium alloy and plasticity and toughness are greatly improved.
4, after the application adds rich cerium, the novel modifying-refining agent of lanthanum Al-Ti-B-Ce-La, can the crumby multi-element compounds AlSiMnFe of refinement further, and making Eutectic Silicon in Al-Si Cast Alloys be refined as rod-short or spherulitic by bodkin shape, rare earth element also has certain de-iron effect in addition.
Accompanying drawing illustrates:
Fig. 1 is for adding common fining agent ADC1 product metallographic structure figure (1), and wherein A is thick faller gill shape Fe-riched phase;
Fig. 2 is for adding common fining agent ADC1 product metallographic structure figure (2), and wherein A is thick faller gill shape Fe-riched phase;
Fig. 3 is for adding Al-Ti-B-Ce-La novel modifying-refining agent ADC1 product metallographic structure figure (1);
Fig. 4 is for adding Al-Ti-B-Ce-La novel modifying-refining agent ADC1 product metallographic structure figure (2).
Embodiment
Below by specific embodiment, the invention will be further described, and following examples are descriptive, is not determinate, can not limit protection scope of the present invention with this.
In the application, New Regenerated aluminium modifying-refining agent inventive principle is as follows:
Rare earth element ce, La with the impurity element effect in aluminium liquid, can generate stable intermetallic compound (REFe
5, Al
8cu
4rE, Al
8mn
4rE etc.), these compound good heat resistances, thermostability are high, become crystallization nuclei in Dispersed precipitate containing the second-phase compound of rare earth element, improve nucleation rate, thus refinement crystal grain, the tensile strength of aluminium alloy and plasticity and toughness are greatly improved.After adding rich cerium, the novel modifying-refining agent of lanthanum Al-Ti-B-Ce-La in addition, can the crumby multi-element compounds AlSiMnFe of refinement further, and make Eutectic Silicon in Al-Si Cast Alloys be refined as rod-short or spherulitic by bodkin shape, rare earth element also has certain de-iron effect in addition.
The concrete steps of the melting method of secondary aluminum are as follows:
1, the preparation of the novel modifying-refining agent of Al-Ti-B-Ce-La
(1) select commercial-purity aluminium (99.70%), K2TiF6, KBF6, AlCe10 alloy, AlLa10 alloy etc. as raw material, the target value of finished product fining modifier effective constituent is: 92Al-5Ti-1B-1Ce-1La.The massfraction scope of the novel modifying-refining agent of Al-Ti-B-Ce-La is: 4.5-6.5%Ti, 0.8-1.2%B, 0.6-1.4%Ce, 0.6-1.4%La, and aluminium is surplus.
(2) by load weighted commercial-purity aluminium, K
2tiF
6, KBF
6, AlCe10 alloy, AlLa10 alloy put into the dry 2-3 hour of constant temperature preheating and drying stove of 250 DEG C.
(3) in 1 ton of experimental furnace, add load weighted commercial-purity aluminium, furnace temperature 800 DEG C is set, electrified regulation.
(4), when being warming up to 800 DEG C, add load weighted K
2tiF6, KBF
6mixture, fully stirs, and is incubated 1 hours, ensures TiAl
3, TiB
2particle is distributed in melt more uniformly.
(5) add AlCe10 alloy, AlLa10 alloy, stir at set intervals, make rare earth element be uniformly distributed in melt, leave standstill 30 minutes, when temperature reach about 750 DEG C skim, degasification, 5 minutes time.
(6) cast when temperature reaches about 720-740 DEG C, after the demoulding, be the new and effective modifying-refining agent of Al-Ti-B-Ce-La.
2, the novel modifying-refining agent of Al-Ti-B-Ce-La is utilized to produce secondary aluminum product
(1) load weighted commercial-purity aluminium, industrial silicon, waste aluminum (scrapping body cylinder cap, air conditioning pump, useless wheel hub) are put into the dry 2-3 hour of constant temperature preheating and drying stove of 250 DEG C.
(2) in 20T accumulation of heat smelting furnace, add waste aluminum, industrial silicon, commercial-purity aluminium, igniting heating.
(3) after all raw materials melt completely, measuring tempeature.When temperature reaches about 750 DEG C, add the refining slag-cleaning agent of gross weight 0.2%-0.25%, adjustment nitrogen flow, carries out degasification slagging-off, 5 minutes time.
(4) when temperature reaches 730 DEG C-750 DEG C, add the novel modifying-refining agent of Al-Ti-B-Ce-La of 0.3-0.5wt%, fully stir, leave standstill 15 minutes, detect composition and adjust.
(5) when temperature reaches 680-720 DEG C, casting ingot casting.
In order to illustrate aforesaid method, the application is to produce ADC1 product, and describe concrete production process, production process comprises two steps, is the preparation of novel modifying-refining agent and the melting of secondary aluminum respectively, specific as follows:
Following examples use slag-cleaning agent be: HGJ-2 aluminium alloy without sodium refining slag-cleaning agent, upper marine rainbow light metal flux factory.
Embodiment 1
New Regenerated aluminium modifying-refining agent and utilize the method for this fining agent melting secondary aluminum, specific as follows:
1, prepare the novel modifying-refining agent of Al-Ti-B-Ce-La, always feed intake 1000kg.
(1) by load weighted commercial-purity aluminium, K
2tiF
6, KBF
6, AlCe10 alloy, AlLa10 alloy put into dry 2.5 hours of the constant temperature preheating and drying stove of 250 DEG C.
(2) in 1 ton of experimental furnace, add 542kg commercial-purity aluminium, furnace temperature 800 DEG C is set, firing up.
(3), when being warming up to 800 DEG C after commercial-purity aluminium fusing, add 192kg K
2tiF6,116kg KBF
6, fully stir, be incubated a hours, ensure TiAl
3, TiB
2particle is distributed in melt more uniformly.
(4) add 75kg AlCe10 alloy, 75kg AlLa10 alloy, stir at set intervals, make rare earth element be uniformly distributed in melt, leave standstill 30 minutes, skim when temperature reaches about 750 DEG C.Adjustment nitrogen flow, preheating degasification rod, degasification, 5 minutes degasification time.
(5) cast when temperature reaches 720 DEG C, after the demoulding, be the new and effective modifying-refining agent of Al-Ti-B-Ce-La.
2, the novel modifying-refining agent of Al-Ti-B-Ce-La is utilized to produce ADC1 product.
(1) load weighted commercial-purity aluminium, industrial silicon, waste aluminum are put into dry 2.5 hours of the constant temperature preheating and drying stove of 250 DEG C.
(2) in 20T accumulation of heat smelting furnace, add waste aluminum 12000kg, industrial silicon 200kg, commercial-purity aluminium 2800kg, always feed intake 15T, igniting heating.
(3), after all raw materials melt completely, measuring tempeature, detects composition.Composition qualified (one), when temperature reaches about 750 DEG C, adds gross weight 35kg refining slag-cleaning agent, and adjustment nitrogen flow, carries out degasification slagging-off, 5 minutes degasification time.
(4) when temperature reaches 740 DEG C, add and prepare the novel modifying-refining agent of 75kgAl-Ti-B-Ce-La, fully stir, leave standstill 15 minutes, detect composition, detected value is (two).
(5) composition is qualified, when temperature reaches about 720 DEG C, and casting ingot casting.
The standard that composition is qualified is: Si:11.5-12.5Fe:0.65-0.95Mg:< 0.29Cu:< 0.9Zn:< 0.48Mn:< 0.28Ni:< 0.48Sn:< 0.095Al: surplus.
Wherein, acceptance value is detected: (one) Si:12.1414Fe:0.6611Mg:0.2272Cu:0.7317Zn:0.4783Mn:0.1677N i:0.0237Sn:0.0036.
Detect acceptance value: (two) Si:12.1751Fe:0.7202Mg:0.2341Cu:0.7455Zn:0.2771Mn:0.2328N i:0.0197Sn:0.0015.
Embodiment 2
New Regenerated aluminium modifying-refining agent and utilize the method for this fining agent melting secondary aluminum, specific as follows:
1, prepare the novel modifying-refining agent of Al-Ti-B-Ce-La, always feed intake 800kg.
(1) by load weighted commercial-purity aluminium, K
2tiF
6, KBF
6, AlCe10 alloy, AlLa10 alloy put into dry 2.5 hours of the constant temperature preheating and drying stove of 250 DEG C.
(2) in 1 ton of experimental furnace, add 433kg commercial-purity aluminium, furnace temperature 800 DEG C is set, firing up.
(3), when being warming up to 800 DEG C after commercial-purity aluminium fusing, add 154kgK
2tiF6,93kgKBF
6, fully stir, be incubated a hours, ensure TiAl
3, TiB
2particle is distributed in melt more uniformly.
(4) add 60kgAlCe10 alloy, 60kgAlLa10 alloy, stir at set intervals, make rare earth element be uniformly distributed in melt, leave standstill 30 minutes, skim when temperature reaches about 750 DEG C.Adjustment nitrogen flow, preheating degasification rod, degasification, 5 minutes degasification time.
(5), when temperature reaches 720 DEG C of casting, after the demoulding, be the new and effective modifying-refining agent of Al-Ti-B-Ce-La.
2, the novel modifying-refining agent of Al-Ti-B-Ce-La is utilized to produce ADC1 product
(1) load weighted commercial-purity aluminium, industrial silicon, waste aluminum are put into dry 2.5 hours of the constant temperature preheating and drying stove of 250 DEG C.
(2) in 20T accumulation of heat smelting furnace, add waste aluminum 16000kg, industrial silicon 250kg, commercial-purity aluminium 3750kg altogether, always feed intake 20T, igniting heating.
(3), after all raw materials melt completely, measuring tempeature, detects composition.
(4) silicone content detected value is 11.4, off analysis.Add silicon 60kg, fully stir and detect until completely melted.
(5) composition is qualified, when temperature reaches 750 DEG C, adds gross weight 60kg refining slag-cleaning agent, and adjustment nitrogen flow, carries out degasification slagging-off, 5 minutes degasification time.
(6) when temperature reaches 740 DEG C, add and prepare the novel modifying-refining agent of 100kgAl-Ti-B-Ce-La, fully stir, leave standstill 15 minutes, detect composition.
(7) composition is qualified, when temperature reaches about 720 DEG C, and casting ingot casting.
The present invention is compared with the secondary aluminum of common fining agent melting, and index contrast is as follows:
Table 1, indices contrast
Table 2 allocation sheet
By drawing above: produce waste aluminum proportion in the raw material of ADC1 product and brought up to 80% by original 10%-50%.The energy consumption of producing secondary aluminum is only equivalent to produce about 5% of primary aluminum energy consumption, and energy-saving effect is given prominence to; Compared with production primary aluminum, producing 1 ton of secondary aluminum can reduce CO
2quantity discharged 0.8 ton (reduce 90%), reduce sulfurous gas 0.6 ton, can economize on water 10.05 tons simultaneously, use solid-state material 11 tons less, can not produce asphalt smoke and fluoride pollution, greenness is high.When application New Refiners produces secondary aluminium alloy, owing to having increased substantially waste aluminum proportion in the feed, production cost can be made to decline about 5%, simultaneously owing to avoiding repeatedly adjusting component, energy consumption and burn out rate have been declined all to some extent.
As shown in Figure 1,2,3, 4, as can be seen from metallographic structure figure, the ADC1 product adding common fining agent still can see the thick faller gill shape Fe-riched phase isolating matrix to metallograph before and after process, and Eutectic Silicon in Al-Si Cast Alloys is also mostly bodkin shape.Add the ADC1 product that the novel modifying-refining agent of Al-Ti-B-Ce-La is produced, acicular beta iron disappears mutually substantially.Eutectic Silicon in Al-Si Cast Alloys is refined as rod-short and spherulitic by bodkin shape.The product tensile strength produced like this and plasticity and toughness all obviously strengthen.
Claims (1)
1. a method for melting secondary aluminum, is characterized in that: first prepare secondary aluminum modifying-refining agent, then utilizes modifying-refining agent to produce secondary aluminum,
Utilize the concrete grammar of modifying-refining agent production secondary aluminum as follows:
(1) load weighted commercial-purity aluminium, industrial silicon, waste aluminum are put into the dry 2-3 hour of constant temperature preheating and drying stove of 250 DEG C;
(2) in accumulation of heat smelting furnace, add waste aluminum, industrial silicon, commercial-purity aluminium, igniting heating;
(3) after all raw materials melt completely, measuring tempeature, when temperature reaches 750 DEG C, adds the refining agent of gross weight 0.2%-0.25%, and adjustment nitrogen flow, carries out degasification slagging-off;
(4) when temperature reaches 730 DEG C-750 DEG C, add the secondary aluminum modifying-refining agent of 0.3-0.5wt%, fully stir, leave standstill, detect composition and adjust;
(5) composition is qualified, when temperature reaches 680-720 DEG C, and casting ingot casting, obtained secondary aluminum;
The massfraction scope of described modifying-refining agent is: 4.5-6.5%Ti, 0.8-1.2%B, 0.6-1.4%Ce, 0.6-1.4%La, and surplus is aluminium;
The preparation method of described fining agent is:
(1) select commercial-purity aluminium, K
2tiF
6, KBF
6, AlCe10 alloy, AlLa10 alloy is as raw material;
(2) by load weighted commercial-purity aluminium, K
2tiF
6, KBF
6, AlCe10 alloy, AlLa10 alloy put into the dry 2-3 hour of constant temperature preheating and drying stove of 230-260 DEG C;
(3) in drying oven, add load weighted commercial-purity aluminium, furnace temperature 800 DEG C is set, electrified regulation;
(4), when being warming up to 800 DEG C, add load weighted K
2tiF
6, KBF
6mixture, fully stirs, insulation, ensures TiAl
3, TiB
2particle is distributed in melt more uniformly;
(5) add AlCe10 alloy, AlLa10 alloy, stir, make mentioned component be uniformly distributed in melt, leave standstill, when temperature reach 730-800 DEG C skim, degasification, time 3-7 minute;
(6) cast when temperature reaches 720-750 DEG C, after the demoulding, be Al-Ti-B-Ce-La secondary aluminum modifying-refining agent.
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| CN103361487B (en) * | 2013-07-22 | 2015-04-22 | 南南铝业股份有限公司 | Production method of recycled aluminum |
| CN104004932B (en) * | 2014-06-03 | 2016-08-24 | 芜湖永达科技有限公司 | A kind of aluminium bits application process in aluminum alloy cylinder cover casts |
| CN104818398B (en) * | 2015-03-23 | 2017-08-11 | 芜湖黄燕实业有限公司 | Wheel hub aluminium alloy and preparation method thereof and aluminium alloy wheel hub |
| CN105648251A (en) * | 2016-02-01 | 2016-06-08 | 东南大学 | Preparation method of aluminum, lanthanum and boron grain refiner used for cast aluminum alloy |
| CN107661971B (en) * | 2016-07-31 | 2023-02-28 | 浙江跃岭股份有限公司 | Liquefying device for low-pressure casting aluminum alloy hub |
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|---|---|---|---|---|
| CN1851010A (en) * | 2006-04-25 | 2006-10-25 | 清华大学 | Aluminium-titanium-horon rare earth fining agent, and its preparing method |
| CN101205581A (en) * | 2007-11-21 | 2008-06-25 | 葛炳灶 | Secondary aluminum prepared by using Al-Ti-C-Sr alloy refiner and preparation thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1851010A (en) * | 2006-04-25 | 2006-10-25 | 清华大学 | Aluminium-titanium-horon rare earth fining agent, and its preparing method |
| CN101205581A (en) * | 2007-11-21 | 2008-06-25 | 葛炳灶 | Secondary aluminum prepared by using Al-Ti-C-Sr alloy refiner and preparation thereof |
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Effective date of registration: 20200522 Address after: 300457 No. 58, Tai Tai Road, west end of Binhai New Area, Tianjin Patentee after: Tianjin xinlizhong alloy Group Co., Ltd Address before: 300457 No. 58, Tai Tai Road, west end of Binhai New Area, Tianjin Patentee before: Tianjin Lizhong Alloy Group Co.,Ltd. |