EP0074978A1 - Ceramic filter, method for manufacturing and utilizing this filter - Google Patents
Ceramic filter, method for manufacturing and utilizing this filterInfo
- Publication number
- EP0074978A1 EP0074978A1 EP82900929A EP82900929A EP0074978A1 EP 0074978 A1 EP0074978 A1 EP 0074978A1 EP 82900929 A EP82900929 A EP 82900929A EP 82900929 A EP82900929 A EP 82900929A EP 0074978 A1 EP0074978 A1 EP 0074978A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ceramic filter
- filter
- ceramic
- gekenn
- foam
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/0615—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances the burned-out substance being a monolitic element having approximately the same dimensions as the final article, e.g. a porous polyurethane sheet or a prepreg obtained by bonding together resin particles
-
- 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
- B01D39/2093—Ceramic foam
-
- 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
- B22C9/084—Breaker cores
-
- 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
-
- 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
- B22C9/088—Feeder heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/007—Treatment of the fused masses in the supply runners
-
- 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
- the invention relates to a ceramic filter with an open-cell foam structure based on Al-O or other highly refractory, in particular high-alumina materials for filtering metal melts, a process for its production and its use for cleaning molten metals and metal alloys, preferably iron .
- DE-OS 2 848 005 describes a porous ceramic filter with a relatively low permeability for filtering
- OMPI Aluminum melting known.
- the main object of the present invention is to provide a ceramic filter which also enables effective cleaning of such metal melts which have a high degree of resistance to temperatures above 1000 ° C., in particular of cast iron.
- the task is to create a ceramic filter of the aforementioned type, which has a high temperature resistance in the range of 1350 - 1650 C and allows a high potting speed.
- Another object of the present invention is to provide a method for the production of such a ceramic filter, which both guarantees compliance with the required specifications and also permits rational production for mass production.
- the invention thus relates to a ceramic filter with an open-cell foam structure based on Al 2 O_ or other highly refractory substances for filtering metal melts, characterized by a flow rate of 200 to 5000 cm 3 of melt per cm 2 of filter area per minute.
- the flow rate according to the invention can be achieved by a large number of combinations of the main parameters, number of pores per cm / porosity / thickness of the filter, and applies to a position of the pouring funnel above the filter of 15 to 30 cm.
- the filters according to the invention in particular when casting cast iron, have a significantly improved cleaning effect compared to the previously known agents and, because of their temperature resistance, also have increased operational reliability.
- the use of the filter according to the invention does not change the composition of the filtered melt.
- a ceramic filter which is preferably 0.5 to 18 per centimeter in length 0.5 - 8, has pores.
- the desired coarse toxicity results in a lower porosity compared to known filters, which extends from 0.95 down to 0.3.
- the porosity P is determined using the following formula:
- the open-cell foam structure should have a high degree of uniformity. It should be noted here that at most 5%, preferably at most 2%, blocked pores, if possible in a uniform distribution, are present in order to avoid channel formation and thus a reduction in the efficiency of the filter.
- a large number of materials can be used to manufacture the filter according to the invention.
- the main constituent is preferably Al 2 O 3 in an amount of 60-95% by weight, preferably 75-80% by weight.
- highly refractory materials in particular those containing high alumina, can also be used, e.g. Sillimannite, mullite or chamotte.
- aluminosilicates for example kaolin
- aluminosilicates for example kaolin
- Another component is the glow product of a binder, e.g. Monoaluminum phosphate, which by the setting process according to the formula:
- An open-cell foam structure of an organic material is impregnated with a slurry of a composition containing ceramic aluminum oxide and a binder. The slurry solvent and organic substance are then removed. - 6 -
- the organic material can be a reticulated.
- the slurry is preferably an aqueous e.g. with a share of 3 - 8% water.
- the composition advantageously has a viscosity in the range of 10 4 to 2-104 centipoise at 20 revolutions per minute.
- the excess slurry is removed from the foam by passing the impregnated foam through a system of pairs of rollers. The foam is then dried to remove the water.
- the organic substance and the residual water can be removed by heating, for example to above 225 ° C.
- Particularly effective filters can be produced by subjecting them to a re-impregnation in order to secure the exposed cell webs lying on the surface of the filter against breaking and to give the filter an increased temperature resistance.
- the dried and impregnated foam described above is subjected to a further impregnation with a ceramic slurry on the surface, dried again and heated to remove the organic substance and at temperatures between 1200 ° C and 1500 ° C, preferably between 1350 C and 1450 ° C calcined.
- the impregnated ceramic filter is dried at temperatures between 150 ° C. and 600 ° C., preferably between 250 ° C. and 350 ° C.
- a wetting agent in an amount of, for example, 0.5-2.0% by weight has proven to be advantageous.
- the thixotropic ceramic material can be produced according to the above in a variety of formulations, but particularly good results are obtained with 65% A1 2 0 3 , 3% kaolin, 1% alkylbenzenesulfonate as wetting agent, 25% monoaluminum phosphate and 6 % Water achieved.
- the filter earths are used in front of or in the sand mold or the mold, with installation to be as close as possible to the casting.
- 1 to 6 show partial sections of the cavities of a mold in a perspective view.
- Fig. 1 shows the arrangement of a ceramic filter 1 in the barrel 2 of a mold, such as a sand mold, where
- the barrel is arranged between a sprue 3 having a sprue and the mold cavity (not shown).
- the first part 2a of the barrel branching off from the sprue 3 is arranged in the lower mold part, the ceramic filter 1 being arranged at the other widened end thereof.
- the second part 2b of the barrel is then arranged in the upper part of the mold and leads from the shown extended end, which is arranged above the ceramic filter 1, to the mold cavity.
- the melt poured into the sprue 3 thus flows through the ceramic filter from bottom to top, the filtered melt passing through part 2b of the barrel into the mold cavity.
- FIG 3 shows the arrangement of a ceramic filter 1 designed as a round plate between the sprue 3 and the barrel 2 leading to the mold cavity, the filter 1 likewise being easily insertable into the mold base provided with the barrel 2 and from above is flowed through by the melt below.
- FIG. 4 shows the arrangement of the ceramic filter 1 between the barrel 2 and a closed feeder 4 - also called ingot - arranged above it in the upper part of the mold, from which the melt directly into the cavity of the mold to be produced Casting 5 arrives.
- the ceramic filter 1 is flowed through by the melt from bottom to top and can be inserted into the bottom part of the mold from above.
- the ceramic filter 1 is arranged between the closed feeder 4 and the mold cavity for the casting 5.
- the plate-shaped ceramic filter 1 is used in a vertical position in the bottom mold part and / or upper mold and also serves as a pre-recorded breaking point - also called refractive core - 'for the separation of the casting 5 from the group consisting of sprue 3, Run 2 and Suiter 4 gating system.
- FIG. 6 shows the direct use of a ceramic filter 1 between the inlet spigot 3 and the casting 5, the ceramic filter 1 also forming the predetermined breaking point here.
- the ceramic filter is flowed through by the melt from top to bottom, whereby an arrangement on the lower part of the casting 5 with a flow from bottom to top is also possible.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Filtering Materials (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
Un filtre en ceramique de structure poreuse a alveoles ouvertes, a base d'oxyde d'aluminium ou d'autres substances hautement refractaires, en particulier a teneur elevee en alumine, est utilise pour filtrer, respectivement pour purifier des metaux en fusion dont la temperature de coulee est superieure a 1000 C, notamment de la fonte en fusion, lors de la coulee dans des moules en sable ou dans des coquilles. La vitesse de passage a travers le filtre s'eleve a 200 - 5000 cm3 de matiere en fusion par cm2 de surface du filtre par minute. La fabrication du filtre en ceramique utilisable a la maniere d'un article a jeter est realisee a l'aide d'un liant au phosphate de monoaluminium.A ceramic filter of porous structure with open cells, based on aluminum oxide or other highly refractory substances, in particular with a high alumina content, is used to filter, respectively to purify molten metals whose temperature of casting is higher than 1000 C, in particular of the molten cast iron, during the casting in molds in sand or in shells. The speed of passage through the filter is 200 - 5000 cm3 of molten material per cm2 of filter surface per minute. The manufacture of the ceramic filter which can be used as a disposable article is carried out using a monoaluminum phosphate binder.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH208981 | 1981-03-27 | ||
CH2089/81 | 1981-03-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0074978A1 true EP0074978A1 (en) | 1983-03-30 |
Family
ID=4225633
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82900929A Withdrawn EP0074978A1 (en) | 1981-03-27 | 1982-03-26 | Ceramic filter, method for manufacturing and utilizing this filter |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0074978A1 (en) |
JP (1) | JPS58500434A (en) |
BR (1) | BR8207248A (en) |
ES (1) | ES8306625A1 (en) |
IT (1) | IT1151368B (en) |
WO (1) | WO1982003339A1 (en) |
ZA (1) | ZA822136B (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3305445A1 (en) * | 1983-02-11 | 1984-08-16 | Schweizerische Aluminium Ag, Chippis | CERAMIC PORED FILTER BODY AND A METHOD FOR PRODUCING THE SAME |
CH655328A5 (en) * | 1984-02-15 | 1986-04-15 | Fischer Ag Georg | CERAMIC FILTER. |
EP0126847A1 (en) * | 1984-02-17 | 1984-12-05 | Georg Fischer Aktiengesellschaft | Ceramic filter |
EP0159963B1 (en) * | 1984-04-23 | 1992-01-29 | Alusuisse-Lonza Services Ag | Ceramic filter with an open cells foam structure |
GB8604569D0 (en) * | 1986-02-25 | 1986-04-03 | Foseco Int | Casting of molten ferrous metal |
FR2599990B1 (en) * | 1986-03-19 | 1993-03-26 | Ceramiques Composites | FILTER FOR LIQUID METALS BASED ON ALVEOLAR CERAMIC MATERIAL, ITS PREPARATION METHOD AND ITS APPLICATION TO THE FILTRATION OF METALS OR LIQUID ALLOYS OF VERY HIGH MELTING POINT |
US4708326A (en) * | 1986-12-15 | 1987-11-24 | Swiss Aluminium Ltd. | Vented pouring cup for molten metal casting |
US4842037A (en) * | 1987-06-10 | 1989-06-27 | Foseco International Limited | Metal casting patterns |
CH676094A5 (en) * | 1988-02-12 | 1990-12-14 | Fischer Ag Georg | |
CH679746A5 (en) * | 1989-01-11 | 1992-04-15 | Fischer Ag Georg | |
DE3905080C1 (en) * | 1989-02-18 | 1989-11-30 | Georg Fischer Ag, Schaffhausen, Ch | Ceramic filter for filtering metal melts |
EP0410603A1 (en) * | 1989-07-26 | 1991-01-30 | Foseco International Limited | Casting of molten iron and filters for use therein |
GB9107223D0 (en) * | 1991-04-05 | 1991-05-22 | Foseco Holding Int Ltd | Filters for light metals |
TW200719941A (en) | 2005-09-05 | 2007-06-01 | Vesuvius Crucible Co | Filter device for molten metal filtration and method for producing such filters |
CN103203431B (en) * | 2013-05-04 | 2015-05-06 | 日月重工股份有限公司 | Filter for casting |
CN105689650A (en) * | 2016-04-28 | 2016-06-22 | 江苏锡华铸造有限公司 | Casting gating system with scum riser |
CN110862269A (en) * | 2019-12-10 | 2020-03-06 | 萍乡市恒升特种材料有限公司 | Preparation method of high-strength foamed ceramic |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3090094A (en) * | 1961-02-21 | 1963-05-21 | Gen Motors Corp | Method of making porous ceramic articles |
GB1377691A (en) * | 1973-01-03 | 1974-12-18 | Foseco Int | Porous ceramic materials |
US3893917A (en) * | 1974-01-02 | 1975-07-08 | Alusuisse | Molten metal filter |
NO148381C (en) * | 1975-03-28 | 1983-09-28 | Alusuisse | CERAMIC FOAM FILTER FOR MILT METAL FILTERING, PROCEDURE FOR ITS MANUFACTURING AND APPLICATION OF THE FILTER |
CA1130980A (en) * | 1977-11-25 | 1982-09-07 | Swiss Aluminium Ltd. | Method for the filtration of molten metal |
CA1137523A (en) * | 1978-08-12 | 1982-12-14 | Tsuneaki Narumiya | Ceramic porous body |
-
1982
- 1982-03-26 IT IT20410/82A patent/IT1151368B/en active
- 1982-03-26 JP JP57501015A patent/JPS58500434A/en active Pending
- 1982-03-26 EP EP82900929A patent/EP0074978A1/en not_active Withdrawn
- 1982-03-26 WO PCT/CH1982/000048 patent/WO1982003339A1/en not_active Application Discontinuation
- 1982-03-26 BR BR8207248A patent/BR8207248A/en unknown
- 1982-03-26 ES ES510842A patent/ES8306625A1/en not_active Expired
- 1982-03-29 ZA ZA822136A patent/ZA822136B/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO8203339A1 * |
Also Published As
Publication number | Publication date |
---|---|
ES510842A0 (en) | 1983-06-01 |
WO1982003339A1 (en) | 1982-10-14 |
ZA822136B (en) | 1983-03-30 |
IT8220410A0 (en) | 1982-03-26 |
IT1151368B (en) | 1986-12-17 |
JPS58500434A (en) | 1983-03-24 |
BR8207248A (en) | 1983-03-01 |
ES8306625A1 (en) | 1983-06-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19821113 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB LI LU NL SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19840218 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HOFMANN, FRANZ Inventor name: TRINKI, GERD Inventor name: OTTO, JUERGEN Inventor name: TRAPP, HANS GUENTER Inventor name: RIETZSCHER, ROLF Inventor name: KAETTLITZ, WOLFGANG |