GB2306896A - A filter device for molten metal with a refractory fibrous body - Google Patents
A filter device for molten metal with a refractory fibrous body Download PDFInfo
- Publication number
- GB2306896A GB2306896A GB9623382A GB9623382A GB2306896A GB 2306896 A GB2306896 A GB 2306896A GB 9623382 A GB9623382 A GB 9623382A GB 9623382 A GB9623382 A GB 9623382A GB 2306896 A GB2306896 A GB 2306896A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filter
- molten metal
- filtration device
- outlet
- cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 55
- 239000002184 metal Substances 0.000 title claims abstract description 55
- 238000001914 filtration Methods 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 239000002657 fibrous material Substances 0.000 claims abstract description 8
- 229910000323 aluminium silicate Inorganic materials 0.000 claims abstract description 7
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000008187 granular material Substances 0.000 claims abstract description 6
- 238000002844 melting Methods 0.000 claims abstract description 6
- 230000008018 melting Effects 0.000 claims abstract description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims abstract description 5
- 239000000919 ceramic Substances 0.000 claims abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 239000010445 mica Substances 0.000 claims description 5
- 229910052618 mica group Inorganic materials 0.000 claims description 5
- 239000005995 Aluminium silicate Substances 0.000 claims description 4
- 235000012211 aluminium silicate Nutrition 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 4
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000011819 refractory material Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 230000000873 masking effect Effects 0.000 claims description 3
- 229910001338 liquidmetal Inorganic materials 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims 2
- 239000007767 bonding agent Substances 0.000 claims 1
- 239000012141 concentrate Substances 0.000 claims 1
- 238000010304 firing Methods 0.000 claims 1
- 238000005470 impregnation Methods 0.000 claims 1
- 230000002401 inhibitory effect Effects 0.000 claims 1
- 239000011368 organic material Substances 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 238000005245 sintering Methods 0.000 claims 1
- 230000006698 induction Effects 0.000 abstract description 3
- 230000002411 adverse Effects 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 241000209456 Plumbago Species 0.000 description 3
- 229910010271 silicon carbide Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000005088 metallography Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2068—Other inorganic materials, e.g. ceramics
- B01D39/2082—Other inorganic materials, e.g. ceramics the material being filamentary or fibrous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
- B01D29/03—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/001—Retaining slag during pouring molten metal
- B22D43/004—Retaining slag during pouring molten metal by using filtering means
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
A filtration device (10, fig 2) for filtering molten metal comprises a body defining a cavity (shown by crucible 12) for receiving molten metal, an outlet 19 for the molten metal from the body and a means 20 for holding a filter between the cavity and the outlet 19, characterised in that the body is comprised of a refractory fibrous material which may be ceramic such as alumino-silicate fibres. A fluid impermeable layer 32 may be added to the body proximate the outlet 19 to prevent gas leakage through the walls of the body which could otherwise adversely affect pressurising of the molten metal within the cavity. Details of a method of manufacture of such a cavity, rapid induction melting of a solid metal sample within the cavity and a filter element comprised of sintered granules such as alumina or zircona are also disclosed.
Description
FILTRATION DEVICE
The invention relates to a filtration device comprising a sample holder and filter for example for separating inclusions such as oxides and borides from fluids such as molten metal. In particular the invention relates to filtration devices to enable characterisation of molten aluminium.
It is shown to provide devices for filtering a sample of molten metal on-line in a foundry. The filtration process allows the molten metal to pass through the device whilst, at any same time, concentrating any inclusions above a filter in the device. By filtering a known quantity of molten metal, it is possible to quantify the concentration of the inclusions present in the foundry process. This quantification can be achieved after filtration for example by optical analysis and quantitative metallography of the inclusions which have built up on the filter surface during filtration.
In such systems, it is known to provide a crucible made of refractory material such as plumbago having a filter in its lower end made of porous graphite, alumina or silicon carbide for example. It is also known to provide an over-pressure above the filter using a pressure chamber or an under-pressure below the filter using a suction tube and reservoir, in order to draw the molten metal through the filter into a catchment container.
Several problems exist in the known systems such as that crucibles made of plumbago require preheating to a temperature in the order of or above the molten metal temperature prior to filtration and therefore do not lend themselves to easy handling in operation. Preheating is generally carried out in a separate furnace which results in a cumbersome and not fully portable operation. Additionally, it is generally the case that only molten metal samples are processed because of difficulties and inconsistencies associated with remelting previously solidified metal samples since using the procedures of the prior art, it is not possible to guarantee the results of the test. That is, additional impurities are added in remelting, for example if carried out in a first crucible in a furnace before transferring the sample to a heated plumbago crucible.
An object of the invention is therefore to avoid or at least mitigate these problems of the prior art. Accordingly, one aspect of the invention provides a filtration device, or crucible, for filtering molten metal comprising a body defining a cavity for receiving molten metal, an outlet from the body for the molten metal, and means for holding a filter between the cavity and outlet for concentrating inclusions in the metal in the cavity, characterised in that the body comprises refractory fibrous material.
Beneficially, the fibrous material can be a ceramic such as alumino-silicate fibres which do not absorb very much energy from the molten metal and therefore do not need to be preheated prior to filtration. Furthermore because of the degree of thermal insulation provided by these crucibles, there is no radiated heat from their outside surfaces and therefore the filtration unit can be more compact and handled more easily and conveniently.
To ensure that the pressurising gas does not permeate through the body and base of the fibrous crucible and thereby adversely affect the pressurizing of the molten metal through the filter, it is preferable that the body comprises an air impermeable layer such as a masked or coated region. This mask or coating should be thick enough to prevent gas leakage and preferably extend at least across the base of the crucible such as to form a complete fillet at the junction between the filter and the base of the body of the crucible and possibly for some distance up the outside edges, or at least to a point beyond any gasket adjacent the base of the crucible. The coating is preferably thin enough and of a material such that it does not crack during drying and generally provides an impermeable and continuous surface layer.A layer in the order of or less than I mm thick of diluted Fraxbond is preferred.
Another aspect of the invention is to use the thermally insulating and non-electrically conducting nature of the crucibles to enable the rapid induction melting of a solid metal sample (charge) in the crucible to form a representative liquid metal sample which can then be pressure filtered. It is preferable to provide a lid to the system in order to physically confine the charge during melting and to control the degree of turbulence in the system caused by the electro magnetic forces generated in the melting cycle.
The advantage of such a confined rapid melting procedure is that the quality of the sample with respect to oxide films and other solid inclusions in the metal is not changed significantly during the remelting process and therefore the inclusion measurements after remelting a solid charge are essentially the same as measurements taken from an initially liquid charge taken from the same starting metal. Also, the temperature control in the system is very good because of the low heat capacity of the crucible.
A further aspect of the invention provides a filter comprising, for example alumina granules, preferably bonded with silica, silica carbide or sintered metal wherein preferably the surfaces of the filter which contact the filtration material in use are unfinished and not ground. Such a filter is preferably included in a container according to the earlier aspect of the invention. An aspect of the invention therefore provides a filtration device comprising a crucible and a filter according to the other aspects of the invention.
A yet further aspect of the invention provides a method of making a filtration device comprising the steps of any of the individual processes identified in the following description.
Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings in which;
Figure 1 is a schematic plan view from above of a filtration device according
to the invention;
Figure 2 is a schematic, cross-sectional, side elevation view of the device
shown in figure 1 fitted in part of a filtration system;
Figure 3 is a plan view from below of the device shown in figures 1 and 2; and
Figure 4 is a cross-sectional view of the lower end of the device shown in
figures 1, 2 and 3.
A filtration device 10 according to the invention is shown in drawings 1 to 4 comprising a crucible 12 having an open upper end and a lower end 14 containing a relatively narrower outlet 19. The inner surface of lower region 14 comprises a relatively large aperture 16 whilst the outer surface comprises a narrower aperture 18 which define the outlet 19 from the crucible 12. Additionally, the apertures provide a recess region comprising an annular ledge 20 on which a filter 22 can be placed thereby presenting a first surface 24 to the inside of crucible 12 and a second surface 26 to the outlet-side. Filter 22 can be held in position in aperture 16 using a refractory cement 28, preferably Fraxbond, which is available from Carborundum Corporation, is used.
Additionally, the inner edges of the filter are sealed to prevent flow of molten metal around the filter. A film 30 is applied to the inner surface of crucible 12. The film should be a refractory material impermeable to the molten metal such as aluminium under pressure and preferably contains flake or platelets together with refractory cement. Preferred materials contain mica or kaolin and one such material is micawash available from Microfine Minerals Limited.
Beneficially, as well as masking the edge regions of filter 22 to prevent flow of molten metal around the filter, the film 30 enables the active area of filtration of surface 24 to be masked off to a desired shape, such as circular, and size.
Furthermore, a lowermost film 32 is used to mask the lower region 14 of crucible 12 thereby restricting movement of fluid such as air through the bottom end of the crucible. This film should be continuous and extend at least across the base and possibly part way up the side walls. It should form a complete fillet at the junction with the filter 22. The film 32 can extend over the lower radius of the crucible to a point 320 shown in figure 4, thereby restricting any downward flow of gas through the base 14 of crucible 12. Preferably film 32 is made of diluted Fraxbond.
Preferably, the crucible is made of a fibro0us refractory material such as aluminosilicate. A preferred material is procal available from Foseco since it is inert to molten aluminium and iron and has a very low thermal conductivity and low heat capacity.
Such material provides a crucible which is readily manually handleable (albeit preferably with gloves) even when full of molten metal at temperatures up to 1000 C.
To form a crucible according to the invention, the alumino-silicate fibres are preferably bonded with an organic binder, moulded into shape and fired to fix or remove the organic binder. The crucible is then dipped to impregnate it with a rigidizer such as sodium silicate and fired in order to give it sufficient mechanical strength in use such as to support the molten metal and facilitate manual handling before and after the filtration process.
In a preferred form the filter comprises alumina granules, or girconia granules, bonded with silica, or silicon carbide, or sintered metal such as stainless steel. Preferably the filter surfaces 24 and 26 are unfinished and not ground since this is found to enhance consistency of flow characteristics. The use of the above materials for the filter and crucible is beneficial not least since one or more of the materials is inert with respect to aluminium, magnesium, iron and nickel based materials. Accordingly, molten metals consisting mainly of these elements can be filtered using the present devices.
Preferably the average pore size in the filter is between 50 and 200 micrometres (lam) and more preferably in the order of 90 micrometres (cm).
Referring to figure 2, it can be seen that in use the device can be inserted into a filtration system FS comprising upper lid L, base B and gaskets G positioned against the upper and lower ends of crucible 12. The gaskets can be attached to the crucible for example by using an adhesive paste. Accordingly, lowermost gasket G can be added at the time of forming film 32. Molten metal may then be added to crucible 12 or alternatively a solidified sample within a crucible 12 can be heated to a desired temperature using an induction coil heater, before allowing the metal M to pass through filter 22 through outlet 0 of system FS. In the event that an overpressure is used to effect filtration, fluid communication to a compressor can be provided via an inlet I.In the event that molten metal is drawn through filter 22 by an under pressure inlet I acts as a vent to equalise pressure above the molten metal M within the crucible 12.
Additionally, especially if for example the upper end of crucible 12 is sealed against a gasket during filtration, it is possible to provide an aperture or apertures in the upper wall of the crucible to allow fluid flow into the crucible.
In order to form a filtration device according to the invention from basic materials, it is possible to manufacture a crucible 12 as described above or purchase a procal 6 crucible from Foseco. i.e. a crucible consisting principally of alumino silicate fibre and silica, and to manufacture a filter as described above. A clean crucible without any internal or external cracks should be used wherein ledge 20 in the base area should be formed and preferably made flat. Cement such as Fraxbond 715 should then be added to aperture 16 for fixing the filter in place. For uniform results the filter and the orientation thereof should be made consistent. Excess cement should be removed from around the filter such as in aperture 18 and no bubbles should be present since this can lead to failure after drying.Region 28 of cement should fill the gap between the filter 22 and crucible 12 without unduly covering too much of the filter. The crucible should then be left to dry, for example for 2 hours at ambient temperature. Lower film 32 can then be added using an air impermeable paste such as Fraxbond 715 with 10 per cent water which is painted on the base of the crucible and allowed to dry. The masking surface 30 can then be painted on the inside of crucible 12 using for example one part
Mica mixed with three parts water. The inner surface of crucible 12 should be painted together with the adhesive region 28. Preferably a stencil is placed over the centre of filter 22 to prevent painting the wash over the central region of the filter. The crucible should then be left to dry at ambient conditions prior to inspection followed by an oven-drying process at 150"C for half and hour. The method according to the invention includes a method of forming a filtration device comprising any one of the above steps or any combination of the individual steps.
Claims (36)
1. A filtration device for filtering molten metal comprising a body defining a cavity for
receiving molten metal, an outlet for the molten metal from the body, and means for holding a filter between the cavity and outlet for concentrating inclusions in the metal in the cavity, characterised in that the body comprises refractory fibrous material.
2. A filtration device according to claim 1 wherein, the fibrous material comprises a ceramic such as alumino-silicate fibres.
3. A filtration device according to claim 1 or 2 wherein the body comprises a fluid impermeable layer such as a masked or coated region, adjacent the outlet
4. A filtration device according to claim 3 wherein the fluid impermeable layer is thick enough to prevent gas leakage therethrough.
5. A filtration device according to claim 3 or 4 wherein the fluid impermeable layer extends at least across the base of the device to form a complete fillet at the junction at the outlet between the filter and the base of the body.
6. A filtration device according to claim 5 wherein the fluid impermeable layer extends some distance up the outside edges of the body.
7. A filtration device according to claim 6 wherein the device comprises a gasket on the outside of the body proximal the outlet, and the fluid impermeable layer extends some distance beyond the gasket up the outside edges of the body.
8. A filtration device according to any of claims 3 to 7 wherein the fluid impermeable layer is in the order of or less than 1 mm thick.
9. A filtration device according to any of claims 3 to 8 wherein the fluid impermeable layer comprises diluted Fraxbond.
10. A filtration device according to any preceding claim wherein the filter holding means comprises a ledge in the body, which ledge is preferably annular and preferably substantially smooth.
11. A filtration device according to claim 10 wherein the filter is fixed to the holding means by a cement such as Fraxbond 715.
12. A filtration device according to any preceding claim wherein the filter has a first surface operably presented to the cavity, which surface is partially masked to provide an active filtration area in use.
13. A filtration device according to claim 12 wherein the mask comprises refractory material impermeable to molten metal.
14. A filtration device according to claim 13 wherein the film comprises flake or platelets and a refractory cement.
15. A filtration device according to any of claims 12 to 14 wherein the film comprises mica or kaolin.
16. A filtration device according to any of claims 13 to 15 wherein the mask extends beyond the filter onto the body surface adjacent thereto.
17. A filter for inhibiting the flow of inclusions in molten metal, comprising sintered granules, such as alumina or zirconia.
18. A filter according to claim 17 comprising a granule bonding agent such as silica, silica carbide or sintered metal.
19. A filter according to claim 17 or 18 comprising a first surface which operably contacts the molten metal, the surface comprising an active region which operably allows flow of molten metal thorugh the filter and which region is unfinished.
20. A filter according to claim 19 wherein the active region is unground after sintering.
21. A filter according to claim 20 or 21 wherein the active region is defined by a film on the first surface, which film is impermeable to molten metal.
22. A filter according to claim 21 wherein the film comprises platelet material such as mica or kaolin.
23. A filter according to any of claims 17 to 22 comprising a second surface through which molten metal leaves the filter, the second surface comprising a region which is unfinished and preferably unground.
24. A filter according to claim 23 wherein the active region of the second surface is defined by a film of platelet material such as mica or kaolin.
25. A filter according to any of claims 17 to 24 or independently thereof, wherein the average pore size is in the region of 50 to 200 (pom) and preferably about 90 (pom).
26. A method of making a filtration device for separating inclusions from molten metals, comprising the step of fabricating a body, defining a cavity for the molten metal, of refractory fibrous material.
27. A method according to claim 26 wherein the body is formed by bonding the fibrous material together using a binder which is fixed for example during firing.
28. A method according to claim 25 or 26 wherein the fibrous material is alumino silicate and the binder is an organic material.
29. A method according to claim 26, 27 or 28 further comprising the step of rigidising the body by impregnation of a rigidizer.
30. A method according to any of claims 26 to 29 comprising the step of forming means within the body for holding a filter.
31. A method according to the previous claim comprising the step of fixing a filter in the holding means using an adhesive.
32. A method according to any preceding claim comprising the step of sealing the body adjacent an outlet for the molten metal thereby to inhibit flow of fluids, such as air, through the body.
33. A method according to any of claims 26 to 32 comprising the step of temporarily masking an active region of the filter while applying a film to the filter, thereby operably to allow molten metal to flow through the active area but not the film.
34. A method according to the preceding claim comprising the step of extending the film across the body adjacent to the filter.
35. Use of a filtration device according to any of claims 1 to 16 to enable the rapid melting of a solid metal sample in the device to form a representative liquid metal sample which can then be filtered.
36. A filtration device for filtering molten metal comprising a body defining a cavity for receiving molten metal, an outlet from the body for the molten metal, and a filter positionable adjacent the outlet to concentrate inclusions in the molten metal above the filter which filter is in accordance with any of claims 17 to 25.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9523124.7A GB9523124D0 (en) | 1995-11-11 | 1995-11-11 | Filtration device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9623382D0 GB9623382D0 (en) | 1997-01-08 |
| GB2306896A true GB2306896A (en) | 1997-05-14 |
| GB2306896B GB2306896B (en) | 1999-08-18 |
Family
ID=10783750
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB9523124.7A Pending GB9523124D0 (en) | 1995-11-11 | 1995-11-11 | Filtration device |
| GB9623382A Expired - Lifetime GB2306896B (en) | 1995-11-11 | 1996-11-11 | Filtration device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB9523124.7A Pending GB9523124D0 (en) | 1995-11-11 | 1995-11-11 | Filtration device |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU7579396A (en) |
| GB (2) | GB9523124D0 (en) |
| WO (1) | WO1997018339A2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7472613B2 (en) | 2003-05-06 | 2009-01-06 | Alcan International Limited | Device and method for measuring metal inclusions |
| GB2544330A (en) * | 2015-11-13 | 2017-05-17 | Cat Int Ltd | Apparatus for filtering molten metal and method of manufacturing the same |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2198301C (en) * | 1997-02-24 | 2004-09-14 | Alcan International Limited | Portable liquid metal filtration device for inclusion analysis |
| DE102009033501B4 (en) * | 2009-07-15 | 2016-07-21 | Schott Ag | Method and device for continuous melting or refining of melts |
| CN103170586A (en) * | 2013-03-28 | 2013-06-26 | 无锡海特铝业有限公司 | Direct torrefied type molten aluminum filtering tank |
| CN110108125B (en) * | 2019-06-06 | 2023-11-28 | 烟台华正科信实业有限公司 | Melting furnace for processing silicate melt |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1311508A (en) * | 1970-05-19 | 1973-03-28 | Foseco Int | Crucibles for use in metal casting |
| GB2030597A (en) * | 1978-08-23 | 1980-04-10 | Alcan Res & Dev | Filtering Aluminium |
| US4444377A (en) * | 1982-07-14 | 1984-04-24 | Daniel E. Groteke | Molten metal transfer crucible |
| US4504392A (en) * | 1981-04-23 | 1985-03-12 | Groteke Daniel E | Apparatus for filtration of molten metal |
| US4564175A (en) * | 1982-07-14 | 1986-01-14 | Metcast Associates, Inc. | Molten metal transfer crucible with external filter |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1152505A (en) * | 1967-06-23 | 1969-05-21 | Dow Chemical Co | Filter Apparatus |
| BE754558A (en) * | 1969-08-08 | 1971-02-08 | Alcan Res & Dev | METHOD AND APPARATUS FOR FILTERING FUSION METALS |
| US4124506A (en) * | 1977-09-22 | 1978-11-07 | Swiss Aluminium Ltd. | Method for the filtration of molten metal in a crucible type furnace |
| US4366721A (en) * | 1981-02-10 | 1983-01-04 | Union Carbide Corporation | Molten metal sampling device |
| US4395333A (en) * | 1982-04-14 | 1983-07-26 | Groteke Daniel E | Pre-wet and reinforced molten metal filter |
| DE3340417A1 (en) * | 1983-11-09 | 1985-05-15 | Gebrüder Lüngen GmbH & Co KG, 4006 Erkrath | Filter element for filtering metal melts |
| GB8916839D0 (en) * | 1989-07-22 | 1989-09-06 | Foseco Int | Filters |
| DE9014187U1 (en) * | 1990-10-12 | 1991-01-03 | Kirchmeier, Hans, 5067 Kuerten, De |
-
1995
- 1995-11-11 GB GBGB9523124.7A patent/GB9523124D0/en active Pending
-
1996
- 1996-11-11 AU AU75793/96A patent/AU7579396A/en not_active Abandoned
- 1996-11-11 GB GB9623382A patent/GB2306896B/en not_active Expired - Lifetime
- 1996-11-11 WO PCT/GB1996/002779 patent/WO1997018339A2/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1311508A (en) * | 1970-05-19 | 1973-03-28 | Foseco Int | Crucibles for use in metal casting |
| GB2030597A (en) * | 1978-08-23 | 1980-04-10 | Alcan Res & Dev | Filtering Aluminium |
| US4504392A (en) * | 1981-04-23 | 1985-03-12 | Groteke Daniel E | Apparatus for filtration of molten metal |
| US4444377A (en) * | 1982-07-14 | 1984-04-24 | Daniel E. Groteke | Molten metal transfer crucible |
| US4564175A (en) * | 1982-07-14 | 1986-01-14 | Metcast Associates, Inc. | Molten metal transfer crucible with external filter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7472613B2 (en) | 2003-05-06 | 2009-01-06 | Alcan International Limited | Device and method for measuring metal inclusions |
| GB2544330A (en) * | 2015-11-13 | 2017-05-17 | Cat Int Ltd | Apparatus for filtering molten metal and method of manufacturing the same |
| GB2544330B (en) * | 2015-11-13 | 2018-07-04 | Cat International Ltd | Apparatus for filtering molten metal and method of manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2306896B (en) | 1999-08-18 |
| GB9523124D0 (en) | 1996-01-10 |
| AU7579396A (en) | 1997-06-05 |
| WO1997018339A2 (en) | 1997-05-22 |
| WO1997018339A3 (en) | 1997-07-03 |
| GB9623382D0 (en) | 1997-01-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PE20 | Patent expired after termination of 20 years |
Expiry date: 20161110 |