CN1182077C - Process for purifying and coating on surface of filter by molten aluminium - Google Patents
Process for purifying and coating on surface of filter by molten aluminium Download PDFInfo
- Publication number
- CN1182077C CN1182077C CNB01113089XA CN01113089A CN1182077C CN 1182077 C CN1182077 C CN 1182077C CN B01113089X A CNB01113089X A CN B01113089XA CN 01113089 A CN01113089 A CN 01113089A CN 1182077 C CN1182077 C CN 1182077C
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- coating
- filter
- flux
- purifying
- strainer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Manufacture And Refinement Of Metals (AREA)
- Filtering Materials (AREA)
Abstract
The present invention relates to the technology for purifying and coating the surface of a filter by aluminum melt, which comprises the following steps: (1) preheating the filter to 650 DEG C to 700 DEG C, keeping the preheating speed lower than 50 DEG C / minute, and keeping the heat preserving time within 5 minutes; (2)putting sufficient coating materials into a corundum crucible (or other containers with strong corrosion resistance), putting the corundum crucible into an electric stove to be heated to the temperature higher 50 DEG C than the melting point, and preserving heat; (3) immersing the filter preheated into a molten coating layer (or immersing partial filter), standing for several minutes, then taking out the filler, naturally cooling, and removing redundant coating materials in the filter.
Description
What the present invention relates to is a kind of surface coating technology, and particularly a kind of process for purifying and coating on surface of filter by molten aluminium belongs to Metal smelting or coating processes field.
In the production of aluminium and Al-alloy products, it is very important preparing purified melt.Cleaning molten is the key technology that guarantees the aluminum alloy materials metallurgical quality, is the problem of academia and business circles extensive concern.The purpose of purifying aluminium alloy melt mainly is to reduce the hydrogen content in the melt and the content of oxide inclusion.Industry is extensive use of particularly ceramic foam filter of porous filter, and metal melt is carried out filtration, purification, is used to remove the non-metallic inclusion of various size.Because it is simple and easy to usefulness, and is with low cost, the filtration, purification effect is better found broad application.The preparation method of ceramic foam filter is provided as Chinese patent 88101382.But it seems that from present use result the foam filter part that comes with some shortcomings waits to improve, as: can not dehydrogenation; Obtain higher filtration efficiency, remove more tiny nonmetal inclusion, just must use the aperture littler, the strainer that the PPI value is higher causes purification flow rate to reduce, and strainer is very fast blocked, and shorten work-ing life, increases the cleaning molten cost on the contrary.For setting up the material that coating applies can be any flux (or material of other type) that metal melt purifies that is suitable for, as KCl: NaCl=1: and 1 omnipotent flux, or added Na
3AlF
6, CaF
2(specifically consist of: KCl 35%, and NaCl 35%, Na with the flux JDN-I of rare earth isoreactivity composition
3AlF
610%, CaF
210%, CeF
310%.Document source: " rare-earth flux is to the effect of A356 aluminium alloy ", China YouSe Acta Metallurgica Sinica, 11 volumes, 4 phases).
So press for a kind of new porcelain filter of development, this strainer should have such characteristics: the PPI value is less, can obtain bigger purification flow rate, can obtain higher filtration, purification effect simultaneously again.A method that addresses this problem is to apply a coating (flux or activeconstituents) at general porcelain filter surfaces externally and internally, make a kind of compound filter, catch the ability of nonmetal inclusion so that utilize this coating to improve strainer, and make compound filter have the function of dehydrogenation.
The objective of the invention is to overcome deficiency of the prior art, a kind of process for purifying and coating on surface of filter by molten aluminium is provided.
Technical scheme of the present invention and performance are as follows: the present invention applies special flux or the activated coating of one deck at the internal surface of composite ceramics strainer, the flux that uses is general flux or a kind of activeconstituents as nano material that metal melt purifies that be suitable for, and adopts the method for dip-coating to obtain even, complete flux coating at the internal surface of strainer.
The concrete technology of the present invention is as follows:
1, preheating will be carried out the strainer that coating applies be example with the ceramic foam filter that uses in aluminium melt purifying, strainer need be preheating to 650 ℃-700 ℃, generally can carry out in baking oven or in the electric furnace, the preheating speed is below 50 ℃/minute, soaking time was not less than 5 minutes
2, in corundum crucible (or other corrosion-resistant strong container), place the KCl of 100g: NaCl=1: 1 omnipotent flux or the interpolation of 50g CaF
2KCl as activeconstituents: NaCl=1: 1 omnipotent flux or the interpolation of 50g CaF
2And LaF
3KCl as activeconstituents: NaCl=1: 1 coated materials such as omnipotent flux, and place electric furnace to be heated to above 50 ℃ of its fusing point, be incubated 5 minutes,
3, preheating is good strainer immerses (or part immerses) in the fused coating, leaves standstill and promptly takes out in 5 minutes, places naturally cooling on the shelf, can remove excess coating material in the strainer by action of gravity, to obtain uniform coating; Perhaps adopt alternate manner to remove unnecessary coating.
Because coated material that uses and the good wetting capacity between the filter-carrier by the method for dip-coating, can obtain even, complete coating on strainer, coat-thickness is controlled in the 1-100 micrometer range.According to the result of study of in the molten aluminium filtration, purification, using this composite ceramics strainer, find that the use floating coat can be owing to washing away of melt do not caused loss, therefore contaminated melt confirms this coating stable existence in the filtration, purification process.
Strainer as coated carrier can be the strainer of various potteries and refractory materials matter, can be core pattern straight hole strainer, also can be ceramic foam filter, or the bonding porcelain filter etc.The composite ceramics strainer that uses this kind to have the flux coating can obtain general better filtration, purification effect of strainer and operating procedure performance.For setting up the material that coating applies also can be nano material.But coated material must meet the following conditions:
1, enough well soak into Filters mass-energy, do not soak into metal melt to be filtered, perhaps a little less than the wetting capacity,
2, the fusing point of this coating must be lower than the temperature of fusion of wanting filtering metal melt.
Below further introduce inventive embodiments:
Embodiment 1:
In baking oven or in the electric furnace preheating to carry out the 20PPI ceramic foam filter that coating applies (50 * 50 * 25mm) to 650 ℃-700 ℃, the preheating speed can not surpass 50 ℃/minute, soaking time was not less than 5 minutes.(place 100g flux (KCl: NaCl=1: 1 omnipotent flux), and place electric furnace to be heated to above 50 ℃ of its fusing point, be incubated 5 minutes among the Φ 100 * 100mm) at corundum crucible.The strainer that preheating is good immerses in the flux, leaves standstill taking-up in 5 minutes, places naturally cooling on the shelf, removes unnecessary flux in the strainer by action of gravity, obtains uniform coating, and coat-thickness is about 50 microns.
Embodiment 2:
In baking oven or in the electric furnace preheating to carry out the 10PPI ceramic foam filter that coating applies (50 * 50 * 10mm) to 650 ℃-700 ℃, the preheating speed can not surpass 50 ℃/minute, soaking time was not less than 5 minutes.Corundum crucible (place among the Φ 100 * 100mm) 50g flux (KCl: NaCl=1: 1 omnipotent flux, add CaF again
2As activeconstituents, change the surface properties of liquid flux), and place electric furnace to be heated to above 50 ℃ of its fusing point, be incubated 5 minutes.The strainer that preheating is good immerses in the flux, leaves standstill taking-up in 5 minutes, places naturally cooling on the shelf, removes unnecessary flux in the strainer by action of gravity, obtains uniform coating, and coat-thickness is about 50 microns.
Embodiment 3:
In baking oven or in the electric furnace preheating to carry out the 10PPI ceramic foam filter that coating applies (50 * 50 * 10mm) to 650 ℃-700 ℃, the preheating speed can not surpass 50 ℃/minute, soaking time was not less than 5 minutes.Corundum crucible (place among the Φ 100 * 100mm) 50gJDN-I flux (KCl: NaCl=1: 1 omnipotent flux, add CaF again
2And LaF
3As activeconstituents), and place electric furnace to be heated to above 50 ℃ of its fusing point, be incubated 5 minutes.The strainer that preheating is good immerses in the flux, leaves standstill taking-up in 5 minutes, places naturally cooling on the shelf, removes unnecessary flux in the strainer by action of gravity, obtains uniform coating, and coat-thickness is about 50 microns.
The present inventor has substantive distinguishing features and marked improvement, adopt the porcelain filter of different ppi to apply different coatings, be used for the purification of molten aluminium, can reaching hydrogen content fully, to drop to 0.08ml/100Al following and realize removing fully the above nonmetal inclusion of 10 μ m, and the following nonmetal inclusion content of 10 μ m is lower than 0.02% target.The top coat of compound filter and filter-carrier mortise, stable existence.Use this kind compound filter that metal melt is carried out filtration, purification, can obtain the general better filtration, purification effect of strainer.
Claims (3)
1, a kind of process for purifying and coating on surface of filter by molten aluminium, it is characterized in that process for purifying and coating on surface of filter by molten aluminium (1) need be preheating to strainer 650 ℃-700 ℃, the preheating speed is below 50 ℃/minute, soaking time was not less than 5 minutes, and (2) place the KCl of 100g: NaCl=1 in corundum crucible: 1 omnipotent flux or the interpolation of 50g CaF
2KCl as activeconstituents: NaCl=1: 1 omnipotent flux or the interpolation of 50g CaF
2And LaF
3KCl as activeconstituents: NaCl=1: 1 coated materials such as omnipotent flux, and place electric furnace to be heated to above 50 ℃ of its fusing point, insulation, (3) preheating is good strainer immerses in the fused coating or the part immersion, leave standstill and promptly took out in 5 minutes, naturally cooling is removed excess coating material in the strainer.
2, this process for purifying and coating on surface of filter by molten aluminium according to claim 1, its feature is that also coat-thickness is controlled in the 1-100 micrometer range.
3, this process for purifying and coating on surface of filter by molten aluminium according to claim 1, its feature is that also coated material must meet the following conditions: (1) is enough well soaked into Filters mass-energy, and the fusing point of (2) this coating must be lower than the temperature of fusion of wanting filtering metal melt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01113089XA CN1182077C (en) | 2001-06-07 | 2001-06-07 | Process for purifying and coating on surface of filter by molten aluminium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01113089XA CN1182077C (en) | 2001-06-07 | 2001-06-07 | Process for purifying and coating on surface of filter by molten aluminium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1327964A CN1327964A (en) | 2001-12-26 |
| CN1182077C true CN1182077C (en) | 2004-12-29 |
Family
ID=4659832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01113089XA Expired - Fee Related CN1182077C (en) | 2001-06-07 | 2001-06-07 | Process for purifying and coating on surface of filter by molten aluminium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1182077C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104668495B (en) * | 2014-12-26 | 2019-02-15 | 芜湖市民泰铜业有限责任公司 | A kind of chemical filtering method of refining of non-ferrous metal |
| EP3219692A1 (en) * | 2016-03-16 | 2017-09-20 | Kerneos S.A. | Reactive material based on calcium aluminate and carbon, its process of preparation and its uses for refining metal melts or slags |
| CN108480563B (en) * | 2018-06-06 | 2019-08-30 | 浙江高澳卫浴有限公司 | Used in aluminium alloy casting plaster mold |
| CN110560629B (en) * | 2019-09-20 | 2021-11-30 | 宁波江丰电子材料股份有限公司 | Coating for smelting and casting high-purity aluminum and preparation method and application thereof |
-
2001
- 2001-06-07 CN CNB01113089XA patent/CN1182077C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1327964A (en) | 2001-12-26 |
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