WO2008005139A2 - Bed filter grid plate - Google Patents
Bed filter grid plate Download PDFInfo
- Publication number
- WO2008005139A2 WO2008005139A2 PCT/US2007/013405 US2007013405W WO2008005139A2 WO 2008005139 A2 WO2008005139 A2 WO 2008005139A2 US 2007013405 W US2007013405 W US 2007013405W WO 2008005139 A2 WO2008005139 A2 WO 2008005139A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bed
- bonded
- filter
- filter media
- particle filter
- Prior art date
Links
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B21/00—Obtaining aluminium
- C22B21/06—Obtaining aluminium refining
- C22B21/066—Treatment of circulating aluminium, e.g. by filtration
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/02—Refining by liquating, filtering, centrifuging, distilling, or supersonic wave action including acoustic waves
- C22B9/023—By filtering
-
- 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
Definitions
- This invention pertains to an improvement for bed filters in use in wrought aluminum casting applications, and specifically to the support of the bed, i.e., a bed filter grid plate.
- the overall concept of the invention is to replace an array of cast grid plates in a bed filter with 6-8-10 grit bonded particle filter media plates.
- the current grid plate being used is constructed from a cast refractory material such as Armorkast 65 Al, and current filter media being utilized is tabular alumina.”
- FIG. 1 is a plan view of a current bed filter vessel
- FIG.2 is a cross-sectional view taken along line A-A of FIG. 1 , showing a side view;
- FIG. 3 is a top view of a plate
- FIG. 4 is a side view of the plate
- FIG. 5 is a side view of the plate.
- FIG. 1 illustrates a plan view of a current bed filter vessel.
- FIG. 2 shows a side view of a cross-section consisting of a series of plates that are further illustrated in FIGS. 3-5.
- the plates shown in FIG. 3 are all monolithic/solid cast alumina compositions.
- the slots shown are open holes. Additional views of the plates are shown in FIGS. 4 and 5.
- the purpose of the present invention is to replace the array of slotted grid plates used as supports for the bed with an array of bonded particle filter media grid plates as illustrated in FIG. 3.
- FIGS. 1-5 illustrate one example of a bed filter, but it is to be understood that any other similar type of bed filter may be used and we are not limiting the present development to what has been described here.
- the bonded particle media is made of discrete particle of silicon carbide or aluminum oxide grains and an aluminum-alloy resistant binder system.
- the bonded particle filter is less porous than other filter materials and contains a greater number of tortuous, interconnected pathways. Therefore, there are many more chances to capture inclusions as the molten aluminum flows through the filter.
- the binder system actually has a "fly paper" effect in holding on to inclusions, even with repeated usage.
- Bonded particle filtration is a proven and efficient means for removing oxides from molten aluminum and its alloys. By filtering oxide inclusions and intermetallic sludge, hard spots caused in machining are eliminated, and the full range of alloy properties are improved. Specifically, bonded particle filtration improves fluidity, castability, machinability, yield, and productivity, which will increase profitability. In the present application, two other properties of bonded particle filter media are important. The specific nature of the binder system employed to bond the silicon carbide or alumina grains is chemically resistant to attack by most aluminum alloys; therefore, the media resists degradation through long-term exposure. As bed filter systems are designed to process several million pounds before replacement, such chemical resistance is necessary.
- the bonded particle filter media exhibits sufficient strength at molten aluminum operating temperatures, such that a series of plates, properly supported by "ribs" in the floor of the bed filter vessel, will sufficiently support the weight of the tabular alumina and molten aluminum during operation.
- the bonded particle filter is also corrosion-resistant to molten aluminum over long time periods and thermally conductive.
- Many advantages are anticipated from using the bonded particle media, such as a faster heat-up rate (using silicon carbide), enhanced filtration (since the bonded media serves as a filter as well), and potentially lower cost is anticipated, especially with the replacement of one or more layers of the tabular alumina currently used in the bottom of the bed, and extended bed life (through filtration of the bonded media).
- bonded media serves as a better "buffer” against “channeling” since the bonded media grid plate is "rigid” and has much lower porosity than the current refractory grid plate with holes.
- "Channeling” is the phenomena whereby the loose layering of the non-bonded tabular alumina "shifts" with metal flow or external disturbance and creates preferential flow paths for the molten aluminum to by-pass steady filtration through the bed.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A plate comprised of bonded particle filter media or a series of plates of bonded particle filter media used as an array of 'grid supports' in aluminum casting bed filters. The plate is comprised of 6-8-10 grit bonded particle filter media.
Description
BED FILTER GRID PLATE
BACKGROUND
[0001] This invention pertains to an improvement for bed filters in use in wrought aluminum casting applications, and specifically to the support of the bed, i.e., a bed filter grid plate. The overall concept of the invention is to replace an array of cast grid plates in a bed filter with 6-8-10 grit bonded particle filter media plates. ■ The current grid plate being used is constructed from a cast refractory material such as Armorkast 65 Al, and current filter media being utilized is tabular alumina."
BRIEF DESCRIPTION OF THE DRAWINGS
[0002] FIG. 1 is a plan view of a current bed filter vessel;
[0003] FIG.2 is a cross-sectional view taken along line A-A of FIG. 1 , showing a side view;
[0004] FIG. 3 is a top view of a plate;
[0005] FIG. 4 is a side view of the plate;
[0006] FIG. 5 is a side view of the plate.
DETAILED DESCRIPTION
[0007] This invention pertains to a Bed Filter Grid Plate. FIG. 1 illustrates a plan view of a current bed filter vessel. FIG. 2 shows a side view of a cross-section consisting of a series of plates that are further illustrated in FIGS. 3-5. The plates shown in FIG. 3 are all monolithic/solid cast alumina compositions. The slots shown are open holes. Additional views of the plates are shown in FIGS. 4 and 5. The purpose of the present invention is to replace the array of slotted grid plates used as supports for the bed with an array of bonded particle filter media grid plates as illustrated in FIG. 3.
FIGS. 1-5 illustrate one example of a bed filter, but it is to be understood that any other similar type of bed filter may be used and we are not limiting the present development to what has been described here.
[0008] The bonded particle media is made of discrete particle of silicon carbide or aluminum oxide grains and an aluminum-alloy resistant binder system. The bonded particle filter is less porous than other filter materials and contains a greater number of tortuous, interconnected pathways. Therefore, there are many more chances to capture inclusions as the molten aluminum flows through the filter. In addition, the binder system actually has a "fly paper" effect in holding on to inclusions, even with repeated usage.
[0009] Bonded particle filtration is a proven and efficient means for removing oxides from molten aluminum and its alloys. By filtering oxide inclusions and intermetallic sludge, hard spots caused in machining are eliminated, and the full range of alloy properties are improved. Specifically, bonded particle filtration improves fluidity, castability, machinability, yield, and productivity, which will increase profitability. In the present application, two other properties of bonded particle filter media are important. The specific nature of the binder system employed to bond the silicon carbide or alumina grains is chemically resistant to attack by most aluminum alloys; therefore, the media resists degradation through long-term exposure. As bed filter systems are designed to process several million pounds before replacement, such chemical resistance is necessary.
[0010] Furthermore, the bonded particle filter media exhibits sufficient strength at molten aluminum operating temperatures, such that a series of plates, properly supported by "ribs" in the floor of the bed filter vessel, will sufficiently support the weight of the tabular alumina and molten aluminum during operation. The bonded particle filter is also corrosion-resistant to molten aluminum over long time periods and thermally conductive.
[0011] Many advantages are anticipated from using the bonded particle media, such as a faster heat-up rate (using silicon carbide), enhanced filtration (since the bonded media serves as a filter as well), and potentially lower cost is anticipated, especially with the replacement of one or more layers of the tabular alumina currently used in the bottom of the bed, and extended bed life (through filtration of the bonded media). In addition, reduced labor in rebuilding the bed layering is anticipated by using the bonded media in place of one or more existing bed layers with tabular alumina. The bonded media serves as a better "buffer" against "channeling" since the bonded media grid plate is "rigid" and has much lower porosity than the current refractory grid plate with holes. "Channeling" is the phenomena whereby the loose layering of the non-bonded tabular alumina "shifts" with metal flow or external disturbance and creates preferential flow paths for the molten aluminum to by-pass steady filtration through the bed. By potentially using several layers of bonded media as the filter bed, with positive filtration as cited in the foregoing, less metal volume may need to be employed in the bed and a smaller vessel size (footprint) may result. Moreover, additional filter media results in extended metal flow capacity capability.
[0012] The exemplary embodiment has been described with reference to the preferred embodiments. Obviously, modifications and alterations will occur to others upon reading and understanding the preceding detailed description. It is intended that the exemplary embodiment be construed as including all such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims
1. A plate comprised of bonded particle filter media or a series of plates of bonded particle filter media used as an array of "grid supports" in aluminum casting bed filters.
2. The plate of claim 1, wherein the plate is comprised of 6-8-10 grit bonded particle filter media.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US81206606P | 2006-06-08 | 2006-06-08 | |
US60/812,066 | 2006-06-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2008005139A2 true WO2008005139A2 (en) | 2008-01-10 |
WO2008005139A3 WO2008005139A3 (en) | 2008-03-27 |
Family
ID=38895069
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2007/013405 WO2008005139A2 (en) | 2006-06-08 | 2007-06-07 | Bed filter grid plate |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2008005139A2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4751958A (en) * | 1985-10-04 | 1988-06-21 | Hunter Engineering Company, Inc. | Continuous casting aluminum alloy |
US5286163A (en) * | 1990-01-19 | 1994-02-15 | The Carborundum Company | Molten metal pump with filter |
-
2007
- 2007-06-07 WO PCT/US2007/013405 patent/WO2008005139A2/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4751958A (en) * | 1985-10-04 | 1988-06-21 | Hunter Engineering Company, Inc. | Continuous casting aluminum alloy |
US5286163A (en) * | 1990-01-19 | 1994-02-15 | The Carborundum Company | Molten metal pump with filter |
Also Published As
Publication number | Publication date |
---|---|
WO2008005139A3 (en) | 2008-03-27 |
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