US20170292173A1 - Ceramic filters and filter systems for continuous metal melt filtration - Google Patents
Ceramic filters and filter systems for continuous metal melt filtration Download PDFInfo
- Publication number
- US20170292173A1 US20170292173A1 US15/485,440 US201715485440A US2017292173A1 US 20170292173 A1 US20170292173 A1 US 20170292173A1 US 201715485440 A US201715485440 A US 201715485440A US 2017292173 A1 US2017292173 A1 US 2017292173A1
- Authority
- US
- United States
- Prior art keywords
- filter
- distributor channel
- replaceable
- inclusions
- rotatable
- 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.)
- Abandoned
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 20
- 239000002184 metal Substances 0.000 title claims abstract description 13
- 238000001914 filtration Methods 0.000 title claims abstract description 11
- 239000006260 foam Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 14
- 230000008021 deposition Effects 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 238000004904 shortening Methods 0.000 claims 2
- 238000007598 dipping method Methods 0.000 claims 1
- 239000000161 steel melt Substances 0.000 abstract description 5
- 238000009749 continuous casting Methods 0.000 abstract description 4
- 238000005266 casting Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000000155 melt Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000005272 metallurgy Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000000739 chaotic effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/119—Refining the metal by filtering
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/086—Filters
-
- 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
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Filtering Materials (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
With respect to ceramic filters and filter systems for continuous metal melt filtration, to be able to counter high throughputs of steel melt and also the limitations of filter capacities during continuous casting, an alternative technological approach involves the use of novel, replaceable, and/or rotatable filter bodies at positions in the distributor channel. In some cases, the replaceable and/or rotatable filter bodies may be inserted into the distributor channel for 10 seconds to 30 minutes before being replaced. The filter bodies may be configured as an open-celled foam ceramic or a honeycomb body or a spaghetti filter and serve as a filter geometry of the replaceable and/or rotatable filter bodies in the distributor channel.
Description
- This application is a non-provisional application claiming priority to German Patent Application No. DE 10 2016 106 708.3, which was filed Apr. 12, 2016 and is hereby incorporated by reference in its entirety.
- The present disclosure relates generally to continuous metal melt filtration and, more specifically, to filter systems and ceramic filters for continuous metal melt filtration.
- The question of functionality of a metal component is in industry often associated with the concept of the strength and the toughness of the material used. Both properties depend to a great extent on the purity of the material. However, this concept is not a standard unit of measurement but instead a summarized statement about frequency, size distribution, morphology and chemical type of what are known as nonmetallic inclusions (NMI). Safety components, thin- or thick-walled castings or forged components which are required to meet high standards in terms of strength, toughness and fatigue resistance can become unusable as a result of an unacceptable proportion of NMI or lead to a dramatic reduction in the safety properties, e.g., the notched impact toughness, of up to 40%. Nonmetallic inclusions are defined as impurities in solid form. These can either be introduced from the outside (exogenic inclusions) or be formed in the melt (endogenic inclusions).
- The reduction of nonmetallic inclusions can be performed in various ways, such as (a) avoidance of inclusion formation (via a suitable metallurgical process route) and (b) removal of the inclusions. Especially in the field of secondary metallurgy and in foundries, melt refining is a central subject. Different metal melt treatments and different casting processes lead to different generation of inclusions or combinations of inclusions. For example, mention may here be made of oxides, carbides, silicates, etc., which can be formed very quickly during the casting operation due to the high temperature of the melts. Due to the filling of the mould, which is sometimes turbulent in the case of actual castings, these nonmetallic inclusions are swirled into the contour and, due to their nonwettability represent an internal point of separation, frequently with sharp edges. This leads to internal cracks and thus to failure of the component, especially in the case of dynamic or cyclic loads.
- In the filtration of metallic melts, attention is paid to (a) the transport of the inclusions in the metal melt, which is influenced by the flow regime, the size and relative density of the inclusion particles, the relative pore diameter and the wetting of the filter pores, and (b) the actual process of deposition of the inclusions on the filter wall. The latter is made up of three substeps. Firstly, depending on their size, chemistry and the flow conditions, fine particles agglomerate, then they travel to the filter wall and adhesion subsequently has to occur so that the particles can no longer be entrained by the subsequent flow.
- In the case of continuous casting of steel, customary filter systems as are used in casting into moulds are unsuitable. Owing to the small pore size, ceramic filters for steel melt filtration have a high filtration efficiency but a low volume throughput. The filter capacity is very quickly exhausted accompanied by an increased flow resistance of the “clogged” filter medium caused by deposition of the inclusions in its functional macroporosity until the entire casting process comes to a standstill, if indeed the filter has not totally failed beforehand (fracture of the filter geometry).
- In the field of application of continuous casting, what are known as indirect or direct processes are taken into consideration for removing NMI. In the case of indirect processes, attempts are made to influence the flow by installation of what are known as dams and weirs in the distributor in such a way that the path of the inclusion particles to deposition into the slag is shortened or that the residence time for deposition of the particles is increased. In the case of the direct processes, the filtration of the entire melt and the deposition of the inclusions on the filter material of a filter separator whose geometry should influence the flow of the entire melt as little as possible is sought. One such possibility for effectively filtering the nonmetallic inclusions from the steel melt even at high throughputs is described in German Patent Publication No. DE 197 56687C1. A characteristic of the present disclosure is that the nonmetallic inclusions are, as a result of permanent conveying of the metal flow along a circular or spiral path, deposited on the walls of the spiral channel. The patent document DE 4317820C1 discloses a ceramic chamber in which deposition occurs on the interior surfaces of the chamber and on the guide surfaces in the chamber as a result of single or multiple deflection of the metal flow by at least 90°. In both cases, the permanent filter units are quickly saturated and the flow is greatly impaired.
-
FIG. 1 , at left, is a sectional view of an example cylindrical filter body with macrochannels and an external diameter of 200 mm, andFIG. 1 , at right, is a perspective view of an example “chaotic” spaghetti filter structure, which is 80 mm in height, includes a 120 in diameter, and has a spaghetti thickness of 2.5 mm. - To be able to counter the high throughputs of the steel melt and also the limitations of the filter capacities during continuous casting, an alternative technological approach using novel, replaceable and/or rotatable filter bodies at positions in the distributor channel is pursued according to the present disclosure. The filter bodies can, according to the present disclosure, contribute directly to removal of inclusions (generation of in-situ layers on their filter surfaces on which the inclusions deposit and lead via sintering processes to fastening to the filter surface) and/or indirectly by the path for deposition of the nonmetallic inclusions into the slag of the distributor being shortened by the design of the filter geometry and in combination with the rotation of the filter body and the flow of the steel melt in the distributor. In addition, larger agglomerates/clusters which owing to their size (additional contribution of buoyancy) move in the direction of the slag can be generated according to the present disclosure by targeted setting of the flow.
- According to the present disclosure, filter bodies in the form of an open-celled foam ceramic, a honeycomb body or a spaghetti filter serve as replaceable and/or rotatable filter geometries in the distributor or distributor channel. According to the present disclosure, porous, replaceable and/or rotatable vessels in which stamped fibres or fibre fabrics or spheres or splintering particles are present serve as filter bodies.
- According to the present disclosure, the filter bodies are, depending on the metal alloy and the preceding secondary metallurgy, dipped into the distributor channel for from 10 seconds to 30 minutes and then replaced. According to the present disclosure, at least one filter body is used in the distributor channel. According to the present disclosure, filter bodies are used in the end faces of the distributor channel. According to the present disclosure, four filter bodies can be used in the vicinity of the shadow tube in the distributor channel.
- According to the present disclosure, refractory oxides and/or non-oxides in combination with or without carbon serve as filter materials. According to the present disclosure, cylindrical carbon-bonded filter bodies based on foam ceramics or spaghetti structures having macrochannels having a minimum diameter of 10 mm are used. According to the present disclosure, filter bodies having a minimum diameter of 100 mm and a height of 100 mm are employed. According to the present disclosure, carbon-bonded support materials can be coated with oxides on their surface in a manner analogous to the patent document DE 10 2011 109 681 B4.
Claims (13)
1. A system comprising:
a distributor channel; and
ceramic filters or filter systems for continuous metal melt filtration, wherein replaceable and/or rotatable filter bodies are disposed at positions in the distributor channel.
2. The system of claim 1 wherein the ceramic filters or the filter systems are configured to contribute at least one of
directly to removal of inclusions by generating in-situ layers on filter surfaces of the ceramic filters or the filter systems on which the inclusions deposit and lead via sintering processes to fastening on the filter surfaces, or
indirectly to removal of inclusions by shortening a path for deposition of nonmetallic inclusions into a slag of the distributor channel by a design of filter geometries in combination with rotation of the filter bodies and flow of metal melt in the distributor channel.
3. The system of claim 2 wherein the filter bodies configured as an open-celled foam ceramic or a honeycomb body or a spaghetti filter serve as the filter geometries of the replaceable and/or rotatable filter bodies in the distributor channel.
4. The system of claim 2 wherein porous, replaceable and/or rotatable vessels in which stamped fibres or fibre fabrics or spheres or splintering particles are present serve as the filter geometries of the replaceable and/or rotatable filter bodies.
5. The system of claim 1 wherein at least one filter body is used in an end face of the distributor channel and/or in a vicinity of a shadow tube in the distributor channel.
6. The system of claim 1 further comprising foam ceramics or spaghetti structures with macrochannels and a minimum diameter of 10 mm.
7. A process that employs ceramic filters or filter systems for continuous metal melt filtration, wherein replaceable and/or rotatable filter bodies are disposed at positions in a distributor channel.
8. The process of claim 7 further comprising:
dipping the ceramic filters or the filter systems into the distributor channel for 10 seconds to 30 minutes; and
replacing the ceramic filters or the filter systems.
9. The process of claim 7 wherein the ceramic filters or the filter systems contribute at least one of
directly to removal of inclusions by generating in-situ layers on filter surfaces of the ceramic filters or the filter systems on which the inclusions deposit and lead via sintering processes to fastening on the filter surfaces, or
indirectly to removal of inclusions by shortening a path for deposition of nonmetallic inclusions into a slag of the distributor channel by a design of filter geometries in combination with rotation of the filter bodies and flow of metal melt in the distributor channel.
10. The process of claim 9 wherein the filter bodies configured as an open-celled foam ceramic or a honeycomb body or a spaghetti filter serve as the filter geometries of the replaceable and/or rotatable filter bodies in the distributor channel.
11. The process of claim 9 wherein porous, replaceable and/or rotatable vessels in which stamped fibres or fibre fabrics or spheres or splintering particles are present serve as the filter geometries of the replaceable and/or rotatable filter bodies.
12. The process of claim 7 wherein at least one filter body is used in an end face of the distributor channel and/or in a vicinity of a shadow tube in the distributor channel.
13. The process of claim 7 further comprising providing foam ceramics or spaghetti structures with macrochannels and a minimum diameter of 10 mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016106708.3 | 2016-04-12 | ||
| DE102016106708.3A DE102016106708B4 (en) | 2016-04-12 | 2016-04-12 | Continuous casting process with ceramic filters or filter systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20170292173A1 true US20170292173A1 (en) | 2017-10-12 |
Family
ID=59929464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US15/485,440 Abandoned US20170292173A1 (en) | 2016-04-12 | 2017-04-12 | Ceramic filters and filter systems for continuous metal melt filtration |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20170292173A1 (en) |
| CN (1) | CN107344232A (en) |
| DE (1) | DE102016106708B4 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018126326B4 (en) | 2018-10-23 | 2021-09-09 | Technische Universität Bergakademie Freiberg | Ceramic molten metal filter for the filtration of molten aluminum |
| DE102019117513B3 (en) | 2019-06-28 | 2020-08-06 | Technische Universität Bergakademie Freiberg | Ceramic molten metal filter and method for filtering a molten metal |
| DE102022201617A1 (en) | 2022-02-16 | 2023-08-17 | Technische Universität Bergakademie Freiberg, Körperschaft des öffentlichen Rechts | Filter element for calming the flow and/or cleaning a melt obtained during casting, and a method for producing a filter element |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4640497A (en) * | 1985-10-25 | 1987-02-03 | Swiss Aluminium Ltd. | Filtration apparatus |
| US5741422A (en) * | 1995-09-05 | 1998-04-21 | Metaullics Systems Co., L.P. | Molten metal filter cartridge |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4995592A (en) | 1988-12-22 | 1991-02-26 | Foseco International Limited | Purifying molten metal |
| DE4012093C1 (en) * | 1990-04-14 | 1991-07-04 | Didier-Werke Ag, 6200 Wiesbaden, De | |
| JPH05318062A (en) * | 1992-05-13 | 1993-12-03 | Sumitomo Metal Ind Ltd | Inclusion removing member and device for continuous casting |
| DE4317820A1 (en) | 1993-05-28 | 1994-12-01 | Hans Zahn | Device for protecting passenger cars against theft |
| DE19753026C1 (en) * | 1997-11-17 | 1998-12-10 | Mannesmann Ag | Outlet unit for metallurgical vessels |
| DE19756687C1 (en) | 1997-12-19 | 1999-06-10 | Ingo Dr Ing Riehl | Method and apparatus for separating nonmetal inclusions from metal melts |
| CN100421908C (en) * | 2005-05-27 | 2008-10-01 | 梁斌 | Melt rotating fast filter for extruder |
| CN101092756A (en) * | 2007-06-12 | 2007-12-26 | 江苏盛虹化纤有限公司 | Melt filter capable of automatically switching |
| CN201427392Y (en) * | 2009-04-10 | 2010-03-24 | 张春华 | Fusant filtering system |
| DE102011109681B4 (en) | 2011-08-08 | 2014-07-17 | Technische Universität Bergakademie Freiberg | Steel melt filter and process for its preparation |
| DE102011109684B4 (en) * | 2011-08-08 | 2014-06-12 | Technische Universität Bergakademie Freiberg | Steel or aluminum melt filter made of reactive ceramic |
-
2016
- 2016-04-12 DE DE102016106708.3A patent/DE102016106708B4/en not_active Expired - Fee Related
-
2017
- 2017-04-12 US US15/485,440 patent/US20170292173A1/en not_active Abandoned
- 2017-04-12 CN CN201710236171.8A patent/CN107344232A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4640497A (en) * | 1985-10-25 | 1987-02-03 | Swiss Aluminium Ltd. | Filtration apparatus |
| US5741422A (en) * | 1995-09-05 | 1998-04-21 | Metaullics Systems Co., L.P. | Molten metal filter cartridge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107344232A (en) | 2017-11-14 |
| DE102016106708B4 (en) | 2019-06-13 |
| DE102016106708A1 (en) | 2017-10-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20170292173A1 (en) | Ceramic filters and filter systems for continuous metal melt filtration | |
| US4277281A (en) | Continuous filter for molten copper | |
| US10633273B2 (en) | Process and apparatus for refining molten glass | |
| CN105358237A (en) | Method for manufacturing filtering membranes by additive technique and resulting membranes | |
| WO2018050751A1 (en) | Method for purifying a metal melt in an induction furnace | |
| WO2004009271A1 (en) | Continuous cast aluminum alloy rod and production method and apparatus thereof | |
| AU774835B2 (en) | Device for filtering and adding grain refining agent to metal melts | |
| US8517231B2 (en) | Immersion nozzle | |
| US20180354028A1 (en) | Sludge Removal Devices, Systems, and Methods | |
| Pötschke et al. | Additive manufacturing of hardmetals | |
| JP7157387B2 (en) | Nozzle on tundish | |
| JPH09192532A (en) | Powder classifying apparatus | |
| Kroupová et al. | Proposal of method of removal of mould material from the fine structure of metallic foams used as filters | |
| DE102018126326B4 (en) | Ceramic molten metal filter for the filtration of molten aluminum | |
| US20210024421A1 (en) | Method for refining metal melts or slags | |
| DE19728358A1 (en) | Method for producing cast light-alloy brake disks with local ceramic reinforcement | |
| CA1173623A (en) | Continuous filtering and degassing of molten copper | |
| JPH03110048A (en) | Tundish stopper | |
| Alias et al. | Morphology and Physical Properties of Ceramic Hollow Fibre Membrane: Effect of Different Bore Fluid Flow Rates | |
| JP2016087508A (en) | Filtration filter and water purifier | |
| KR101062953B1 (en) | Immersion nozzle | |
| DE112014002341T5 (en) | DOUBLE-GAS PROCESSING AND DEVICE | |
| RU2536536C1 (en) | Method of obtaining of porous permeable ceramic article | |
| EP4480601A1 (en) | Tundish and continuous casting method using same | |
| JP2002113568A (en) | Plate for slide gate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
| STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
| STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
| STPP | Information on status: patent application and granting procedure in general |
Free format text: FINAL REJECTION MAILED |
|
| STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
| STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
| STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |