CN100409931C - Magnesium alloy liquid agitating and purifier - Google Patents
Magnesium alloy liquid agitating and purifier Download PDFInfo
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- CN100409931C CN100409931C CNB2003101140773A CN200310114077A CN100409931C CN 100409931 C CN100409931 C CN 100409931C CN B2003101140773 A CNB2003101140773 A CN B2003101140773A CN 200310114077 A CN200310114077 A CN 200310114077A CN 100409931 C CN100409931 C CN 100409931C
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Abstract
The present invention relates to a treatment device for magnesium or magnesium alloy liquid, which is used for alloying and refining magnesium and magnesium alloy liquid in the processes of casting, ingot casting and remelting of magnesium and magnesium alloy and waste magnesium recovering production. The alloying and refining of the magnesium and the magnesium alloy in the smelting processes are usually realized by stirring metallic liquid. Through the treatment device, a liquid flow mode required by smelting magnesium alloy can be obtained. Alloy elements are uniformly distributed in the metallic liquids, non-metallic inclusions are aggregated, and a fluxing agent and impurities are combined, roughened and precipitated. The treatment device farthest reduces the consumption of the fluxing agent, reduces the labor intensity, improves the quality of alloying and refining, and ensures the high quality of metallic liquid.
Description
Technical field
The invention belongs to the treatment facility of molten metal in a kind of magnesium alloy smelting, especially the instrument that belongs to magnesium liquid alloying and refining treatment is applicable to production, the magnesium alloy continuous casting of magnesium alloy cast, magnesium and magnesium alloy ingot, magnesium sacrificial anode, the production fields such as waste recovery of magnesium.
Background technology
The production of magnesium alloy product generally all needs raw material are molten into liquid magnesium alloy earlier, and then pours into a mould product with liquid magnesium alloy.The magnesium alloy refining process comprises the raw-material fusing of matrix attitude magnesium metal, alloying element is added with the form of metal or compound and make it uniformly dispersing in whole molten bath, and then the various non-metallic inclusions in the eliminating melt are refining, thereby obtain that composition meets the requirements, objectionable impurities is few, can further make the high-quality magnesium molten mass of the product that needs with this molten metal.
The problem of magnesium ingot existence at present: off analysis, impurity exceed standard, surface quality is poor; The problem that foundry goods exists: off analysis, impurity exceed standard.
It is extremely strict that the foundry goods of refining standard, especially Foundry Production that the industrial production of many magnesium requires to reach very high, the strand of senior magnesium alloy plate, high-purity ingot casting, sacrificial magnesium alloy anode, composition are accurately evenly, oxide inclusion and flux are mingled with restriction.Because the very easily oxidation of magnesium liquid, burning are involved in the formation of oxide skin and flux easily and are mingled with, and make refining procedure complicated.The alloying of magnesium and magnesium alloy and refining are to adopt the stirring to liquid metals to realize mostly, therefore are stirred in most of magnesium and the magnesium alloy production process to seem very important.The mode that the stirring do not adopted is also arranged in the production of magnesium, both without alloying also without refining, only with the furnace charge remelting, this mode of production is limited to the melting of diecast magnesium alloy part, it must be all satisfactory foundry alloy of composition and cleanliness factor that this remelting processing requires raw material.Also have and adopt the method refining of swimming of precipitation purification, filtration, purification, bubble, but all must and the technology mode associating of stirring operation, just as replenishing of stirring.For example: precipitation purify to need the long time of staying, the liquid magnesium alloy of big volume, rational bath temperature gradient, avoids the stirring that thermal convection current causes in the liquid magnesium alloy molten bath and influences sedimentation effect.The filtration, purification method is used for Foundry Production at present mostly, also has to adopt in batches liquid magnesium alloy of filtration, purification.The purpose of filtering refining is to remove the secondary oxidation thing that flows in the final stage of molten metal in alloy liquid, is not suitable for being used for purifying containing the molten metal that is mingled with in a large number.Because the activity of magnesium alloy, except that individual cases, generally do not adopt the bubble method of swimming.
In the production of magnesium goods, need being in the great majority of online alloying in production scene and refining, the production of most magnesium alloys must be carried out alloying and refining by stirring, especially for containing zirconium magnesium alloy, the rotten processing of needs with the magnesium alloy of control tissue, the crude magnesium melting that contains a large amount of oxides of Pidgeon process production, stirring is indispensable.Realize artificial stirring of the many at present employings of the operation of stirring, because the working condition of hot environment is abominable, the stirring technique code requirement reaches regular hour length, make that artificial stirring operation labour intensity is very big, it is very high to specification requirement to form the necessary body flow field of melting, and manually-operated can't be ensured the quality of products.The crucible of molten alloy liquid is too dark during large-scale production, and manpower also is difficult to realize scheduled operation.Someone once was transplanted to the agitator of chemical engineering unit operation in the melting production of magnesium alloy, and effect is bad, does not reach specification requirement; The unsuccessful Another reason of mechanical agitation is an agitator fault rate height, uses trouble.This shows that artificial at present stirring and mechanical agitation apparatus can not satisfy the needs that magnesium industry is produced fully.
Summary of the invention
The objective of the invention is to design the mechanical agitation refining equipment, overcome the existing deficiency that stirs apparatus.New equipment should be able to be realized the needed liquid flow field of magnesium alloy smelting, reaches the alloying element homogenising, is mingled with gathering, and flux and impurity are improved working conditions in conjunction with also alligatoring, precipitation, improves alloying and refining quality, guarantees the qualification rate of product.The stirring purifier is simple in structure, easy to use, fault rate is low, maintenance is easy.
Liquid flow is the uncertainty of three-dimensional, randomness, non-linear and boundary condition in the whipping process.The stirring of liquid magnesium alloy adopts agitator arm that mechanical energy is passed to alloy liquid, makes the motion that alloy liquid produces to be needed, and finishes the mixing and the dispersion of alloying element, the combination of oxide and flux, gathering, precipitation and at melt pool bottom polymerization slagging aggregate mutually.Requirement is stirred in macroscopic view and goes up liquid formation revolution, local formation eddy current, the diffusion of atomic scale, and the metal liquid convective motion of both macro and micro makes the material homogenising, nonmetal running foul of each other during motion.Whipping process must steadily not cause the vigorous oxidation and the burning of magnesium, can not allow the slag of bottom, molten bath rise, when stirring liquid upper surface oxide-film remain complete, do not break; Whipping process requires to form at the upper surface in molten bath the dromedary hump of certain altitude.
According to hydromechanical theory, reach the mixing effect that magnesium and liquid magnesium alloy production technology need, the liquid motion mode that whole molten metal bath is stirred should be the combination of three kinds of different motion:
(1) form the main body convection current, the Methodistic circumnutation on a large scale from the liquid level to the bottom of whole molten metal realizes " agglomerate " of zones of different and mixing of " agglomerate ".Because magnesium alloy generally all is to carry out melting in the crucible of steel plate welding, magnesium liquid should be from down to up elliptic motion at vertical cross-section.
(2) form the eddy current diffusion, the main body convection current can not make liquid among a small circle evenly mix, different fluid layers in the main body convection current should have speed difference, thereby make the strong shear action of interface generation of layer with the layer of friction speed, thereby produce a large amount of vortexs, cause a large amount of interior among a small circle convective motions, these vortexs are reduced to vortex size itself to the inhomogeneities of " agglomerate " and " agglomerate ".
(3) form the atom diffusion, alloy requires element to reach the even mixing of atomic scale, and vorticla motion can produce this kind effect, and the Brownian movement effect of the more little atom of vortex is good more.
Liquid agitation is general uses two kinds of impellers to stir, i.e. radial impeller and axial impeller.The push type of axial impeller can produce liquid macroscopic convection preferably, but the circumnutation effect on a large scale that will reach magnesium and liquid magnesium alloy production technology and need still is impossible.This is because the crucible size of magnesium melting very big (degree of depth is many at 1 to 2 meter), only depends on the promotion of pusher impeller still to be not enough to obtain the main body convection current that needs.To increase guide shell auxiliary for this reason, makes interior all molten metals of crucible carry out compulsory long distance circulation by guide shell.In order to increase the eddy current diffusion, also need to make and stir the number range that Reynolds number reaches turbulent area by adjusting the rotating speed of impeller, eddy current appears in guide shell, must form strong short-range diffusion.In addition, because the viscous effect of molten metal, outside guide shell, grow apart from producing shearing between the different liquid layers of shuttling movement and also can produce vortex.For form the hump of certain altitude at the upper surface in molten bath, the guide shell liquid outlet is designed to slick and sly elbow, side direction when exporting with confined liquid is dispersed and the liquid level hump when forming similar artificial stirring, can disperse more evenly and time of staying in liquid prolongs at the new flux that is sprinkled on the hump.Sink to the degree of depth, motor rotary speed by changing agitator in addition, also can cooperate the effect that reaches adjustment movement speed and flow field, change liquid level hump height,, obtain optimum efficiency to adapt to different operation requirements.
Liquid magnesium alloy makes agitator be in very harsh environment, and especially the rotating machinery fault in high-temperature liquid metal is many, reliability is very poor.The present invention's simplified design of trying one's best by changing impeller in the position of guide shell, shortens propeller shaft length, in case moving component is stuck as far as possible for this reason.The use air motor drives, and also can use Motor Drive, but preferably adopts anti-jamming shaft coupling this moment, as friction coupling with the protection motor.
Liquid magnesium alloy stirs purifier and works in harsh environment, should adopt the heat resisting steel manufacturing of no nickel, cobalt.
Description of drawings:
Stir the structure of purifier as shown in the figure, by impeller 1, rotating shaft 2, bearing 3, shaft joint 4, motor 5, guide shell 6, fluid bend pipe 7, support 8, hook (suspension hook) 9 forms.
Specific implementation method
Embodiment one
The crucible of 150 kg capacity is with stirring purifier, and design data is six impellers, and the diameter of impeller 1 is 80 millimeters, and width is 30 millimeters.The total length of guide shell 6 is 600 millimeters, and diameter is 100 millimeters, and drain pipe elbow axis bending radius is 250 millimeters, and motor rotary speed can be adjusted to 50～250 rev/mins.
Embodiment two
The crucible of 500 kg capacity is with stirring purifier, and design data is six impellers, and the diameter of impeller 1 is 140 millimeters, and width is 40 millimeters.The total length of guide shell 6 is 1200 millimeters, and diameter is 150 millimeters, and drain pipe elbow axis bending radius is 550 millimeters, and motor rotary speed can be adjusted to 50～250 rev/mins.
Claims (4)
1. a liquid magnesium alloy that is used for magnesium alloy smelting process molten metal alloying and refining treatment stirs purifier, by impeller (1), rotating shaft (2), bearing (3), shaft joint (4), motor (5), guide shell (6), fluid bend pipe (7), support (8), hook (9) is formed, it is characterized in that when impeller (1) rotates, can make in the molten bath molten metal under the constraint of guide shell (6) from top to bottom integral body do gyration, different metal liquid fluid layer is done shearing motion mutually, the interpolation material is fully mixed with molten metal, reaching the interpolation element evenly disperses, refining flux runs foul of each other with nonmetal inclusion, absorption, assemble, and be sunken to the purpose of bottom, molten bath.
2. liquid magnesium alloy according to claim 1 stirs purifier, it is characterized in that there is guide shell (6) impeller (1) outside, and guide shell (6) upper end liquid outlet is slick and sly fluid bend pipe (7), and impeller (1) connects with short rotating shaft (2) and motor (5).
3. liquid magnesium alloy according to claim 1 stirs purifier, it is characterized in that both molten metal being carried out the alloying operation, again molten metal is carried out refining operation.
4. liquid magnesium alloy according to claim 1 stirs purifier, it is characterized in that liquid outlet has slick and sly fluid bend pipe (7) and causes liquid level motion liquid hump stably to occur.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101140773A CN100409931C (en) | 2003-11-11 | 2003-11-11 | Magnesium alloy liquid agitating and purifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101140773A CN100409931C (en) | 2003-11-11 | 2003-11-11 | Magnesium alloy liquid agitating and purifier |
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| Publication Number | Publication Date |
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| CN1544670A CN1544670A (en) | 2004-11-10 |
| CN100409931C true CN100409931C (en) | 2008-08-13 |
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| CNB2003101140773A Expired - Fee Related CN100409931C (en) | 2003-11-11 | 2003-11-11 | Magnesium alloy liquid agitating and purifier |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892379B (en) * | 2010-06-18 | 2011-05-11 | 新星化工冶金材料(深圳)有限公司 | Magnesium alloy melt stirring device |
| CN102260800A (en) * | 2011-07-08 | 2011-11-30 | 山西银光华盛镁业股份有限公司 | Magnesium alloy jet refining technique and device thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5575733A (en) * | 1978-12-06 | 1980-06-07 | Tokushu Kika Kogyo Kk | Liquid mixer |
| US4426068A (en) * | 1981-08-28 | 1984-01-17 | Societe De Vente De L'aluminium Pechiney | Rotary gas dispersion device for the treatment of a bath of liquid metal |
| CN86105999A (en) * | 1986-08-30 | 1988-08-10 | 冶金部长沙矿冶研究院 | High efficiency stirring tank |
| CN2091711U (en) * | 1991-03-22 | 1992-01-01 | 浙江大学 | Multifunctional mixer |
| CN2173109Y (en) * | 1992-11-28 | 1994-08-03 | 满元康 | Mix stirring reactor |
| JPH0833897A (en) * | 1994-07-25 | 1996-02-06 | Ataka Kogyo Kk | Axial-flow impeller in agitated aerator and operation of the aerator |
| CN2399089Y (en) * | 1999-12-08 | 2000-10-04 | 胡明南 | Dynamic diversion drum agitator |
-
2003
- 2003-11-11 CN CNB2003101140773A patent/CN100409931C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5575733A (en) * | 1978-12-06 | 1980-06-07 | Tokushu Kika Kogyo Kk | Liquid mixer |
| US4426068A (en) * | 1981-08-28 | 1984-01-17 | Societe De Vente De L'aluminium Pechiney | Rotary gas dispersion device for the treatment of a bath of liquid metal |
| CN86105999A (en) * | 1986-08-30 | 1988-08-10 | 冶金部长沙矿冶研究院 | High efficiency stirring tank |
| CN2091711U (en) * | 1991-03-22 | 1992-01-01 | 浙江大学 | Multifunctional mixer |
| CN2173109Y (en) * | 1992-11-28 | 1994-08-03 | 满元康 | Mix stirring reactor |
| JPH0833897A (en) * | 1994-07-25 | 1996-02-06 | Ataka Kogyo Kk | Axial-flow impeller in agitated aerator and operation of the aerator |
| CN2399089Y (en) * | 1999-12-08 | 2000-10-04 | 胡明南 | Dynamic diversion drum agitator |
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| CN1544670A (en) | 2004-11-10 |
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