CN1360067A - Process for purifying raw aluminium by changing liquid, directional solidification and conticasting - Google Patents
Process for purifying raw aluminium by changing liquid, directional solidification and conticasting Download PDFInfo
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- CN1360067A CN1360067A CN01132329A CN01132329A CN1360067A CN 1360067 A CN1360067 A CN 1360067A CN 01132329 A CN01132329 A CN 01132329A CN 01132329 A CN01132329 A CN 01132329A CN 1360067 A CN1360067 A CN 1360067A
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Abstract
A process for purifying the raw aluminium by means of continuous liquid change, orientational setting and conticasting includes sush steps as smelting raw aluminium, heating crystallizer to a temp higher than the melting point of aluminium, putting the seeding rod in the crystallizer, flowing molten aluminium into flowing tank, stirring it by electromagnetic pump and stirrer to change the liquid at the solid-liquid interface of casting rod, and speeding up the conticasting to a steady stage. Its advantages are high efficiency, low energy consumption and no pollution.
Description
Technical field:
The present invention relates to the novel method that a kind of primary aluminum is purified, relate in particular to a kind of process for purifying raw aluminium by changing liquid, directional solidification and conticasting, belong to metallurgical technology field.
Background technology:
China calls refined aluminium to the aluminium that contains 99.95%≤Al＜99.999%, and the aluminium that contains Al 〉=99.999% is called rafifinal.Refined aluminium has better electroconductibility, ductility, reflectivity and erosion resistance than primary aluminum.Erosion resistance particularly, comparable primary aluminum improves 9 times approximately.Along with the purity raising of aluminium, magnetic diffusivity is more little, and low-temperature conductive is good more.Therefore, refined aluminium has extensive use in low temperature electrotechnology, electronic industry and robot calculator, astronomical telescope, petrochemical complex, nuclear power radar, space flight and aviation, electromobile, semi-conductor industry department.As being used as electrolytic condenser, unicircuit distribution, computer external memory, disk alloy substrate metal etc.Almost 90% refined aluminium is used for producing refined aluminium paper tinsel, preparation bright aluminum alloy, extraordinary aluminium alloy and drawing used for hot spraying aluminium wire etc. at present.Homemade refined aluminium can only meet the need of market at present 1/3rd, and have and have unsalable passive situation, need import in a large number.Therefore, be badly in need of developing have independent intellectual property right, efficiently with high-quality refined aluminium production technology.
Document " refined aluminium market forecast and production technology developments " is (right and wrong, " world's non-ferrous metal " the 5th phase in 1999) and document " aluminium condensation method purification process analyze and process practice " (Lu Liangdong, " non-ferrous metal (smelting part) " the 3rd phase in 1997) introduced the method that adopts three layers of liquid electrolytic process and segregation method purification primary aluminum.Three layers of liquid electrolytic process produced refined aluminium energy consumption height (be segregation method 8 times).Simultaneously, in electrolytic process, produce obnoxious flavour and waste electrolyte serious environment pollutions such as hydrogen fluoride, carbon monoxide, sulfurous gas; Segregation method is the method that segregation phenomena is purified when utilizing alloy graining, and main method has (1) crystal refining method respectively, (2) directional freeze method for refining.This method can not be produced continuously, and production efficiency is low, and there is secondary pollution in residual aluminum liquid to the aluminium of having purified.
Summary of the invention:
The objective of the invention is to the above-mentioned deficiency at prior art, a kind of new process for purifying raw aluminium by changing liquid, directional solidification and conticasting is provided, energy consumption is low, and is pollution-free, and can obtain good refining effect.
The principle of technical solution of the present invention is on the basis of pattern of fever directional freeze continuous casting, add continuous liquid changing device, its objective is the molten metal of changing the solid-liquid interface forward position with flow molten metal and stirring action continuously, reduce the thickness of diffusion layer or destroy diffusion layer, the solid-liquid interface forward position is held in is divided into C
0(impurity element in the primary aluminum is as the content of Na, Fe and Si etc.) solidifies the solid phase composition that and keeps K always
0C
0(K
0Be the equilibrium distribution coefficient of impurity element in the primary aluminum) so that obtain best refining effect.
For this reason, at first in the melting and heat preservation stove, melt primary aluminum in the technical scheme of the present invention, in the chute that aluminium liquid is introduced with continuous casting installation for casting links to each other, the method that adopts electromagnetic pump and lay agitator in casting forward position, excellent freezing interface, casting forward position, excellent freezing interface aluminium liquid is flowed and liquid is changed in stirring, adopt then have the heating crystallizer and with it the continuous casting system of isolating water cooler carry out the purification of directional freeze continuous casting.
Method of purification of the present invention is carried out as follows:
(1) in melting ﹠ holding furnace, melts primary aluminum, overheated 50-150 ℃;
(2) adopt heating member that crystallizer is heated, temperature surpasses the fusing point of aluminium, and the seeding rod is placed on crystallization
In the device;
(3) aluminium liquid is introduced chute from the melting and heat preservation stove, after aluminium liquid is full of, opens electromagnetic pump and make aluminium liquid
Flow, and adopt agitator to stir, change liquid, aluminium liquid in the solid-liquid interface of casting rod
Velocity of flow greater than casting speed.
(4) in the continuous casting initial stage, it is slow that casting speed is wanted, and progressively quickens, and carries out the transition to institute's requirement stably
Speed (10-800mm/min), enter the steady stage, the beginning of purifying.
(5) when residual Al liquid can not be full of chute, purify and finish.
The present invention can determine the cycle index of aluminium liquid and the utilization ratio of aluminium liquid according to the accuracy requirement of institute's purification aluminium in actual mechanical process.
The present invention is applicable to and removes equilibrium distribution coefficient in the primary aluminum less than 1 impurity element.For example, the equilibrium distribution coefficient of impurity element Fe, Si and Na is respectively 0.027,0.024 and 0.014 in the primary aluminum, and the primary aluminum impurity component is: Fe:0.16～0.5%, Si:0.13～0.45%, Na:8～12ppm, aluminium liquid is through after once circulating, and adopting the content of the impurity element after continuous changing liquid, directional solidification continuous casting is purified is Fe:0.00432～0.0135%, Si:0.00312～0.0108, Na:0.112～0.168ppm, Al after purifying＞99.9% reaches the refined aluminium level.
The present invention combines advanced directional solidification technique and continuous casting technology efficiently, has characteristics such as efficient, continuous with present segregation method ratio; With three layers of liquid electrolytic process ratio, have characteristics such as energy consumption is low, pollution-free.
Description of drawings and embodiment:
Fig. 1 is the synoptic diagram of raw aluminium by changing liquid, directional solidification and conticasting method of purification of the present invention.
Among the figure, 1 is the melting and heat preservation stove; 2 aluminium spouts; 3 are the excellent solid-liquid interface of casting; 4 is crystallizer; 5 is heating member; 6 is water cooler; 7 are the casting rod; 8 is aluminium liquid flow direction; 9 is agitator; 10 is aluminium liquid flow circuit route; 11 is the seeding rod; 12 is electromagnetic pump.
Melting and heat preservation stove 1, chute 2 are formed the aluminium fluid circulation with electromagnetic pump 12, its flow direction is 8, route is 10, aluminium liquid agitator 9 is placed in solid-liquid interface 3 forward positions of continuous casting, crystallizer 4 is installed with aluminium spout 2, chute adopts refractory materials, and temperature keeps 660-680 ℃, and crystallizer 4 adopts graphite or refractory materials.
During purification, earlier in melting ﹠ holding furnace 1, melt primary aluminum, adopt heating member 5 crystallizer 4 heating, temperature surpasses the fusing point of aluminium, seeding rod 11 is placed in the crystallizer 4, aluminium liquid is introduced chute 2 from melting and heat preservation stove 1, after aluminium liquid is full of, adopt electromagnetic pump 12 and agitator 9 to change liquid in the solid-liquid interface 3 of casting rod 7.The velocity of flow of aluminium liquid is greater than casting speed, and casting speed is progressively accelerated, and smooth transition enters the steady stage to 100mm/min, the beginning of purifying.When residual Al liquid can not be full of chute 2, purify and finish.
The temperature of heating crystallizer 4 is higher than 660 ℃, utilizes isolating with it water cooler 6, and orientable solidifying continuously casting goes out column crystal or monocrystalline refined aluminium casting rod.
Claims (2)
1, a kind of process for purifying raw aluminium by changing liquid, directional solidification and conticasting, it is characterized in that adopting continuous liquid changing device and directional freeze casting apparatus, in melting ﹠ holding furnace (1), melt primary aluminum earlier, adopt heating member (5) that crystallizer (4) is heated to the fusing point that temperature surpasses aluminium, seeding rod (11) is placed in the crystallizer (4), aluminium liquid is introduced chute (2) from melting and heat preservation stove (1), after aluminium liquid is full of, opening electromagnetic pump (12) flows aluminium liquid, and adopt agitator (9) to stir, solid-liquid interface (3) at casting rod (7) is changed liquid, the velocity of flow of aluminium liquid is greater than casting speed, casting speed is progressively accelerated, and smooth transition is to 10-800mm/min, begins to purify after entering the steady stage.
2, as the said process for purifying raw aluminium by changing liquid, directional solidification and conticasting of claim 1, it is characterized in that the temperature that heats crystallizer (4) is higher than 660 ℃, utilize isolating with it water cooler (6) directional freeze continuous casting to go out column crystal or monocrystalline refined aluminium casting rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011323299A CN1162557C (en) | 2001-11-29 | 2001-11-29 | Process for purifying raw aluminium by changing liquid, directional solidification and conticasting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011323299A CN1162557C (en) | 2001-11-29 | 2001-11-29 | Process for purifying raw aluminium by changing liquid, directional solidification and conticasting |
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| Publication Number | Publication Date |
|---|---|
| CN1360067A true CN1360067A (en) | 2002-07-24 |
| CN1162557C CN1162557C (en) | 2004-08-18 |
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|---|---|---|---|
| CNB011323299A Expired - Fee Related CN1162557C (en) | 2001-11-29 | 2001-11-29 | Process for purifying raw aluminium by changing liquid, directional solidification and conticasting |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102619764A (en) * | 2012-04-24 | 2012-08-01 | 上海大学 | Paddling type aluminum liquid continuous circulation device and method thereof |
| CN102864314A (en) * | 2012-10-21 | 2013-01-09 | 昆明冶金研究院 | Method and device for purifying refined aluminum and high-purity aluminum through continuous segregation |
| CN103866140A (en) * | 2014-03-26 | 2014-06-18 | 李霞 | Segregation-method continuous ingot casting device |
| CN106756193A (en) * | 2016-12-30 | 2017-05-31 | 苏州有色金属研究院有限公司 | Preparation facilities of carbon nanotube enhanced aluminium-based composite material and preparation method thereof |
| CN107297476A (en) * | 2017-08-22 | 2017-10-27 | 北京有色金属研究总院 | The apparatus and method of mechanical agitation continuous casting homogeneous fine crystal ingots |
| CN108315570A (en) * | 2018-02-05 | 2018-07-24 | 江苏金海铝业有限公司 | A kind of equipment preparing large-scale rafifinal |
| CN112161477A (en) * | 2020-09-11 | 2021-01-01 | 帅翼驰(上海)铝合金设备有限公司 | High-purity refining device of molten aluminum melting and maintaining integrated furnace and process flow of high-purity refining device |
| CN115383064A (en) * | 2022-08-30 | 2022-11-25 | 上海交通大学 | Continuous liquid-changing hot type continuous casting metal purification method combined with traveling wave magnetic field electromagnetic stirring |
-
2001
- 2001-11-29 CN CNB011323299A patent/CN1162557C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102619764A (en) * | 2012-04-24 | 2012-08-01 | 上海大学 | Paddling type aluminum liquid continuous circulation device and method thereof |
| CN102864314A (en) * | 2012-10-21 | 2013-01-09 | 昆明冶金研究院 | Method and device for purifying refined aluminum and high-purity aluminum through continuous segregation |
| CN102864314B (en) * | 2012-10-21 | 2015-10-21 | 昆明冶金研究院 | The method and apparatus of a kind of continuous segregation purification refined aluminium and rafifinal |
| CN103866140A (en) * | 2014-03-26 | 2014-06-18 | 李霞 | Segregation-method continuous ingot casting device |
| CN103866140B (en) * | 2014-03-26 | 2015-04-22 | 李霞 | Segregation-method continuous ingot casting device |
| CN106756193A (en) * | 2016-12-30 | 2017-05-31 | 苏州有色金属研究院有限公司 | Preparation facilities of carbon nanotube enhanced aluminium-based composite material and preparation method thereof |
| CN107297476A (en) * | 2017-08-22 | 2017-10-27 | 北京有色金属研究总院 | The apparatus and method of mechanical agitation continuous casting homogeneous fine crystal ingots |
| CN108315570A (en) * | 2018-02-05 | 2018-07-24 | 江苏金海铝业有限公司 | A kind of equipment preparing large-scale rafifinal |
| CN112161477A (en) * | 2020-09-11 | 2021-01-01 | 帅翼驰(上海)铝合金设备有限公司 | High-purity refining device of molten aluminum melting and maintaining integrated furnace and process flow of high-purity refining device |
| CN115383064A (en) * | 2022-08-30 | 2022-11-25 | 上海交通大学 | Continuous liquid-changing hot type continuous casting metal purification method combined with traveling wave magnetic field electromagnetic stirring |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1162557C (en) | 2004-08-18 |
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