CN106676306A - Method for improving purifying effect of rare earth on aluminum alloy melt - Google Patents
Method for improving purifying effect of rare earth on aluminum alloy melt Download PDFInfo
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- CN106676306A CN106676306A CN201710026978.9A CN201710026978A CN106676306A CN 106676306 A CN106676306 A CN 106676306A CN 201710026978 A CN201710026978 A CN 201710026978A CN 106676306 A CN106676306 A CN 106676306A
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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
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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Abstract
The invention discloses a method for improving the purifying effect of rare earth on aluminum alloy melt. Common aluminum melt purifying technologies are integrated, a solvent method and a filtering purifying method are combined, the formula of a refining agent of the solvent agent is optimized, a rare earth mixture is added in the refining agent, and an efficient gas and impurity removing solvent is prepared through reasonable refining agent composition and content matching. The rare earth has a refining function on aluminum melt, the fluidity and casting performance of the aluminum alloy liquid can be improved, an alloy casting structure is refined, and the strength, the hardness, the abrasion resistance and the corrosion resistance of an aluminum alloy are improved. Foam ceramic filters different in hole diameter are arranged in a transverse runner and can effectively remove inclusions smaller than 1-2 microns in molten aluminum, gas in the molten aluminum is removed, the purity of the aluminum alloy is improved, and the foam ceramic filters are most effective tools for removing the inclusions in the aluminum melt at present; and the movement of the aluminum melt obtained after filtering is changed into the laminar movement from the turbulent movement, and the number of air holes in the aluminum alloy due to turbulence can be reduced.
Description
Technical field
The invention belongs to metal material field, refers in particular to a kind of method of raising rare earth to purifying aluminium alloy melt effect.
Background technology
Aluminium alloy has a series of excellent spies such as the good ductility of light weight, heat conductivity is good, intensity is high, excellent corrosion resistance
Property, the industry-by-industry in modernization constructions such as mechanical engineering, derived energy chemical, control equipment, house property buildings is widely applied, it is current high
Aluminum alloy materials are proposed higher and higher strength and stiffness requirement by new technical field
But during aluminium alloy smelting, because furnace charge is unclean, the oxidation of furnace charge generating surface causes the aluminum for having melted to close
Exist inside golden liquid it is a number of be mingled with and gas, have on liquid level by metal-oxide and being involved in exogenous impurity mixture structure
Into slag, slag, be mingled with gas serious harm the performance of aluminium alloy, it is possible to cause scrapping for aluminium alloy castings, because
This, deslagging refining is necessary purification process technique, and conventional deslagging refining has three kinds of modes, (1) flux method：It is molten in aluminium alloy
During refining, solvent is added to inside melt, by series of physical chemical action, reaches the purpose of degasification remove impurity；(2) blow
Gas method：Noble gases are passed into inside aluminum melt, bubble is formed, the hydrogen in melt diffuses into these in the presence of difference of partial pressure
In bubble, and it is excluded with the floating of bubble；(3) Filtration：Aluminum melt is allowed to pass through the filtration of neutral or active material manufacture
Device, to separate the solid inclusions for suspending in the melt.But all there is certain defect in these three methods, solvent method is to environment
With equipment or cause serious infringement, also not substantially, Filtration is for more than 10um for the effect that air blast high cost, removal are mingled with
Be mingled with filter effect preferably, and filter efficiency is mingled with than relatively low for below 10um；7000 series alloys belong to aviation
Series, is aluminium magnesium copper alloy, can heat treatment, belong to superhard alloy, have a good wearability, China is because aluminium melt purifying effect
It is not ideal enough, cause that 7000 line aluminium alloy purity are not high, comprehensive mechanical property has also been short of, and relies on import substantially at present.
The content of the invention
To solve an above-mentioned difficult problem, the present invention proposes a kind of method for improving rare earth to purifying aluminium alloy melt effect, can be with
The metal inclusion and non-metallic inclusion of aluminium alloy melt are effectively removed, hydrogen content, in aluminium alloy melt is reduced, to aluminium alloy melt
Clean-up effect it is obvious.
The purpose of the present invention is achieved through the following technical solutions：A kind of side for improving rare earth to purifying aluminium alloy melt effect
Method, comprises the steps：
(1) preparation of refining agent：Raw material includes that Sodium Chloride, potassium chloride, hexafluoro sodium aluminate, sodium nitrate, sodium carbonate, rare earth are mixed
Compound, in terms of weight fraction, weighs Sodium Chloride 10-20 part, potassium chloride 10-20 parts, hexafluoro sodium aluminate 20-40 parts, sodium nitrate 10-
20 parts, sodium carbonate 10-20 parts, lucium 8-40 parts, by the Sodium Chloride for weighing, potassium chloride, hexafluoro sodium aluminate, sodium nitrate,
Sodium carbonate is respectively placed in drying baker, 60-130 DEG C of baking temperature, and drying time, 2-4h, the lucium for weighing was placed in separately
In outer drying baker, 100-150 DEG C of baking temperature, drying time, 1-3h, used screen filtration after drying, and screen cloth is 400 mesh, is sieved
Raw material is put in cone-type mixer after net filtration is mixed, 1-2h is mixed under conditions of 50-80 DEG C, mixed
After uniform, cone blender is opened, stands cooling, after being down to room temperature, mixture is placed on cold press be pressed into diameter 20cm,
The round pie refining agent of thickness 1-2cm, is put in drying receptacle and preserves；
(2) refine purification：Round pie refining agent is weighed, round pie refining agent is 1 with the weight ratio of aluminium alloy melt:100‐
200, when aluminum melt temperature is 690-720 DEG C, round pie refining agent is slowly introducing into aluminum by aluminium alloy spray refining machine and is closed
In golden melt, when round pie refining agent is all passed in aluminium alloy melt, aluminium alloy spray refining machine is taken out, carries out refine,
Refining time is 3-8h, after refine terminates, by Cinder Machine the scum silica frost of aluminium melt surface is removed, and insulation after removing stands 1-2h；
(3) filtration, purification：First the chip in ceramic foam filter is removed with ear washing bulb, then by the bubble of different pore size
Foam ceramic filter is preheated, preheating temperature 100-150 DEG C, preheating time 0.5-1h, to remove steam, by foamed ceramics mistake
Filter by aperture from big to small successively arranged orthogonal in the cross gate of running gate system, aluminium alloy melt is flowed through successively during filtration
30ppi ceramic foam filters, 25ppi ceramic foam filters, 20ppi ceramic foam filters, 15ppi foam ceramic filters
Device, it is i.e. pourable after the completion of filtration.
The lucium includes lanthanum carbonate, lanthana, Cericammoniumsulfate, cerium fluoride, and its weight ratio is 1-2：1‐2：1：
1。
Poring rate of the rate of filtration of the ceramic foam filter more than aluminium alloy melt.
The ceramic foam filter is silicon carbide material.
The foamed ceramic filter plate thickness is 15-40mm.
The present invention has beneficial effect：The present invention is integrated conventional aluminium melt purifying technology, solvent method and mistake
The filter method of purification combines, and the refine agent prescription to solvent method is optimized, and lucium is added in refining agent, and leads to
Rational refining agent composition, content collocation are crossed, the flux of high-efficiency degasification remove impurity is prepared, lucium thing reacts energy with aluminum melt
Enough to separate out free activity rare earth atom, there is these active rare earth atoms reduction-oxidation aluminum to be mingled with effect；Rare earth element can be with
The impurity such as the oxygen in aluminum alloy melt, nitrogen, hydrogen and a series of low-melting impurities form respectively the high infusible compound of fusing point, it is easy to
Exclude from molten metal together with slag, reach the purpose of deslagging refining；Lanthanum carbonate, lanthana, Cericammoniumsulfate, cerium fluoride
Two-layer protecting film is produced in aluminium liquid purification, internal layer is adsorbable to be mingled with and flux and the reaction product matter being mingled with, it is ensured that aluminum
The purification of liquid, outer layer serves the effect of isolation air conservation aluminium liquid.In addition rare earth has refining effect, Ke Yiti to aluminum melt
The mobility and casting character of high-aluminium alloy liquid, refining alloy cast sturcture enables aluminum alloy to intensity, hardness, wearability and anti-corrosion
Property improve；
The present invention is provided with the different ceramic foam filter in aperture in crossing current road, and foam ceramic filter can effectively remove aluminum
Field trash in liquid less than 1-2um, removes the gas in aluminium liquid, improves the purity of aluminium alloy, improves comprehensive mechanical property, mesh
The most effective instrument of removal of inclusions in front aluminum melt；Aluminum melt filter simultaneously after becomes laminar motion, energy by turbulent motion
The enough quantity for reducing the aluminium alloy internal porosity caused due to turbulent flow.
Specific embodiment
The present invention is further supplemented and described with reference to specific embodiment.
Embodiment 1
A kind of method for improving rare earth to purifying aluminium alloy melt effect, comprises the steps：
(1) preparation of refining agent：Raw material includes that Sodium Chloride, potassium chloride, hexafluoro sodium aluminate, sodium nitrate, sodium carbonate, rare earth are mixed
Compound, in terms of weight fraction, weighs 10 parts of Sodium Chloride, 10 parts of potassium chloride, 20 parts of hexafluoro sodium aluminate, 10 parts of sodium nitrate, sodium carbonate
10 parts, 2 parts of lanthanum carbonate, 2 parts of lanthana, 2 parts of Cericammoniumsulfate, 2 parts of cerium fluoride, by the Sodium Chloride for weighing, potassium chloride, hexafluoro aluminic acid
Sodium, sodium nitrate, sodium carbonate are respectively placed in drying baker, 80 DEG C of baking temperature, drying time 4h, by 2 parts of the lanthanum carbonate, the oxygen that weigh
Change 2 parts of lanthanum, 2 parts of Cericammoniumsulfate, 2 parts of cerium fluoride to be placed in other drying baker, 120 DEG C of baking temperature, drying time, 2h, dried
Screen filtration is used afterwards, screen cloth is 400 mesh, raw material is put in cone-type mixer after screen filtration is mixed, at 50 DEG C
Under the conditions of mix 1h, after mixing and stirring, cone blender is opened, stand cooling, after being down to room temperature, by mixture
It is placed on cold press and is pressed into the round pie refining agent of diameter 20cm, thickness 1cm, is put in drying receptacle and preserves；
(2) refine purification：Round pie refining agent is weighed, round pie refining agent is 1 with the weight ratio of aluminium alloy melt:100,
When aluminum melt temperature is 690 DEG C, round pie refining agent is slowly introducing in aluminium alloy melt by aluminium alloy spray refining machine,
When round pie refining agent is all passed in aluminium alloy melt, aluminium alloy spray refining machine is taken out, carry out refine, refining time is
3h, after refine terminates, by Cinder Machine the scum silica frost of aluminium melt surface is removed, and insulation after removing stands 1h；
(3) filtration, purification：First the chip in ceramic foam filter is removed with ear washing bulb, then by the bubble of different pore size
Foam ceramic filter is preheated, 100 DEG C of preheating temperature, and preheating time, 1h, to remove steam, by ceramic foam filter hole was pressed
Footpath from big to small successively arranged orthogonal in the cross gate of running gate system, aluminium alloy melt flows through successively 30ppi foams during filtration
Ceramic filter, 25ppi ceramic foam filters, 20ppi ceramic foam filters, 15ppi ceramic foam filters, have filtered
Into rear i.e. pourable.
The rate of filtration of the ceramic foam filter is the twice of the poring rate of aluminium alloy melt.
The ceramic foam filter is silicon carbide material.
The foamed ceramic filter plate thickness is 15-40mm.
The alloy that the present invention is cast is alloy for 7000, and casting technique, alloy formula and Chinese invention patent are " a kind of
7000 line aluminium alloy materials and preparation method thereof " (patent No. 201210205032.6) are identical, and its difference is purification skill
Art is different.
Embodiment 2
Substantially the same manner as Example 1, its difference is to weigh 20 parts of Sodium Chloride, 20 parts of potassium chloride, hexafluoro sodium aluminate
40 parts, 20 parts of sodium nitrate, 20 parts of sodium carbonate, 4 parts of lanthanum carbonate, 4 parts of lanthana, 4 parts of Cericammoniumsulfate, 4 parts of cerium fluoride.
Embodiment 3
Substantially the same manner as Example 1, its difference is to weigh 20 parts of Sodium Chloride, 20 parts of potassium chloride, hexafluoro sodium aluminate
40 parts, 20 parts of sodium nitrate, 20 parts of sodium carbonate, 6 parts of lanthanum carbonate, 6 parts of lanthana, 3 parts of Cericammoniumsulfate, 3 parts of cerium fluoride.
Embodiment 4
Substantially the same manner as Example 1, its difference is to weigh 20 parts of Sodium Chloride, 20 parts of potassium chloride, hexafluoro sodium aluminate
40 parts, 20 parts of sodium nitrate, 20 parts of sodium carbonate, 8 parts of lanthanum carbonate, 8 parts of lanthana, 8 parts of Cericammoniumsulfate, 8 parts of cerium fluoride.
Embodiment 5
Substantially the same manner as Example 1, its difference is to weigh 15 parts of Sodium Chloride, 15 parts of potassium chloride, hexafluoro sodium aluminate
30 parts, 15 parts of sodium nitrate, 15 parts of sodium carbonate, 4 parts of lanthanum carbonate, 4 parts of lanthana, 4 parts of Cericammoniumsulfate, 4 parts of cerium fluoride.
Embodiment 6
Substantially the same manner as Example 1, its difference is to weigh 15 parts of Sodium Chloride, 15 parts of potassium chloride, hexafluoro sodium aluminate
15 parts, 15 parts of sodium nitrate, 15 parts of sodium carbonate, 6 parts of lanthanum carbonate, 6 parts of lanthana, 6 parts of Cericammoniumsulfate, 6 parts of cerium fluoride.
Slagging-off, degassing effect after purifying aluminium alloy melt of the present invention improves the purity of aluminium alloy castings up to 97%,
The comprehensive mechanical property for enabling aluminum alloy to foundry goods is greatly improved.
Many other changes and remodeling can be made without departing from the spirit and scope of the present invention.It should be appreciated that the present invention is not
It is limited to specific embodiment, the scope of the present invention is defined by the following claims.
Claims (4)
1. it is a kind of to improve method of the rare earth to purifying aluminium alloy melt effect, it is characterised in that to comprise the steps：
(1) preparation of refining agent：Raw material includes Sodium Chloride, potassium chloride, hexafluoro sodium aluminate, sodium nitrate, sodium carbonate, rare earth mixing
Thing, in terms of weight fraction, weighs Sodium Chloride 10-20 part, potassium chloride 10-20 parts, hexafluoro sodium aluminate 20-40 parts, sodium nitrate 10-20
Part, sodium carbonate 10-20 parts, lucium 8-40 parts, by the Sodium Chloride for weighing, potassium chloride, hexafluoro sodium aluminate, sodium nitrate, carbon
Sour sodium is respectively placed in drying baker, 60-130 DEG C of baking temperature, and drying time, 2-4h, the lucium for weighing was placed in addition
Drying baker in, 100-150 DEG C of baking temperature, drying time 1-3h, after drying use screen filtration, screen cloth be 400 mesh, screen cloth
Raw material is put in cone-type mixer after filtration is mixed, 1-2h is mixed under conditions of 50-80 DEG C, mixed equal
After even, cone blender is opened, stand cooling, after being down to room temperature, mixture is placed on cold press and is pressed into diameter 20cm, thickness
The round pie refining agent of degree 1-2cm, is put in drying receptacle and preserves；
(2) refine purification：Round pie refining agent is weighed, round pie refining agent is 1 with the weight ratio of aluminium alloy melt:100-200,
When aluminum melt temperature is 690-720 DEG C, round pie refining agent is slowly introducing into aluminium alloy by aluminium alloy spray refining machine and is melted
In vivo, when round pie refining agent is all passed in aluminium alloy melt, aluminium alloy spray refining machine is taken out, carries out refine, refine
Time is 3-8h, after refine terminates, by Cinder Machine the scum silica frost of aluminium melt surface is removed, and insulation after removing stands 1-2h；
(3) filtration, purification：First the chip in ceramic foam filter is removed with ear washing bulb, then the foam of different pore size is made pottery
Porcelain filter is preheated, preheating temperature 100-150 DEG C, preheating time 0.5-1h, to remove steam, by ceramic foam filter
By aperture from big to small successively arranged orthogonal in the cross gate of running gate system, aluminium alloy melt flows through successively 30ppi during filtration
Ceramic foam filter, 25ppi ceramic foam filters, 20ppi ceramic foam filters, 15ppi ceramic foam filters, mistake
It is i.e. pourable after the completion of filter.
2. a kind of method for improving rare earth to purifying aluminium alloy melt effect as claimed in claim 1, it is characterised in that described
Lucium includes lanthanum carbonate, lanthana, Cericammoniumsulfate, cerium fluoride, and its weight ratio is 1-2：1‐2：1：1.
3. a kind of method for improving rare earth to purifying aluminium alloy melt effect as claimed in claim 1, it is characterised in that described
Ceramic foam filter is silicon carbide material.
4. a kind of method for improving rare earth to purifying aluminium alloy melt effect as claimed in claim 1, it is characterised in that described
Foamed ceramic filter plate thickness is 15-40mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710026978.9A CN106676306A (en) | 2017-01-15 | 2017-01-15 | Method for improving purifying effect of rare earth on aluminum alloy melt |
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| CN201710026978.9A CN106676306A (en) | 2017-01-15 | 2017-01-15 | Method for improving purifying effect of rare earth on aluminum alloy melt |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107287462A (en) * | 2017-06-14 | 2017-10-24 | 中国科学院金属研究所 | A kind of alloy refining alterant and its preparation method and application |
| CN108359810A (en) * | 2018-03-09 | 2018-08-03 | 北京科技大学 | A kind of environment-friendly type regeneration aluminium refining agent and its application method |
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Patent Citations (6)
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| CN101624666A (en) * | 2008-07-11 | 2010-01-13 | 中国铝业股份有限公司 | High-temperature alterant and method for purifying fusant by adopting same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107287462A (en) * | 2017-06-14 | 2017-10-24 | 中国科学院金属研究所 | A kind of alloy refining alterant and its preparation method and application |
| CN108359810A (en) * | 2018-03-09 | 2018-08-03 | 北京科技大学 | A kind of environment-friendly type regeneration aluminium refining agent and its application method |
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Application publication date: 20170517 |