EP0043817A1 - Self drying aluminium-containing compositions - Google Patents
Self drying aluminium-containing compositionsInfo
- Publication number
- EP0043817A1 EP0043817A1 EP80902297A EP80902297A EP0043817A1 EP 0043817 A1 EP0043817 A1 EP 0043817A1 EP 80902297 A EP80902297 A EP 80902297A EP 80902297 A EP80902297 A EP 80902297A EP 0043817 A1 EP0043817 A1 EP 0043817A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- composition
- aluminium
- alkali metal
- nitrite
- drying
- 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- Withdrawn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
- 239000000203 mixture Substances 0.000 title claims abstract description 54
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 238000001035 drying Methods 0.000 title claims abstract description 16
- 239000004411 aluminium Substances 0.000 title claims description 24
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 13
- -1 alkali metal nitrite Chemical class 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 6
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical group [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 9
- 235000010288 sodium nitrite Nutrition 0.000 claims description 8
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- AZFNGPAYDKGCRB-XCPIVNJJSA-M [(1s,2s)-2-amino-1,2-diphenylethyl]-(4-methylphenyl)sulfonylazanide;chlororuthenium(1+);1-methyl-4-propan-2-ylbenzene Chemical compound [Ru+]Cl.CC(C)C1=CC=C(C)C=C1.C1=CC(C)=CC=C1S(=O)(=O)[N-][C@@H](C=1C=CC=CC=1)[C@@H](N)C1=CC=CC=C1 AZFNGPAYDKGCRB-XCPIVNJJSA-M 0.000 claims description 2
- 239000010425 asbestos Substances 0.000 claims description 2
- 239000000378 calcium silicate Substances 0.000 claims description 2
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 2
- 239000004304 potassium nitrite Substances 0.000 claims description 2
- 235000010289 potassium nitrite Nutrition 0.000 claims description 2
- 229910052895 riebeckite Inorganic materials 0.000 claims description 2
- 229910052845 zircon Inorganic materials 0.000 claims description 2
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 229910001963 alkali metal nitrate Inorganic materials 0.000 abstract description 4
- 239000004576 sand Substances 0.000 abstract description 3
- 230000008719 thickening Effects 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 21
- 238000006243 chemical reaction Methods 0.000 description 12
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 10
- 238000005266 casting Methods 0.000 description 9
- 235000011121 sodium hydroxide Nutrition 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000007800 oxidant agent Substances 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000012670 alkaline solution Substances 0.000 description 4
- 239000004317 sodium nitrate Substances 0.000 description 4
- 235000010344 sodium nitrate Nutrition 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 238000005058 metal casting Methods 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 description 2
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 2
- 241000237858 Gastropoda Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 238000007133 aluminothermic reaction Methods 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 239000011698 potassium fluoride Substances 0.000 description 1
- 235000003270 potassium fluoride Nutrition 0.000 description 1
- KVOIJEARBNBHHP-UHFFFAOYSA-N potassium;oxido(oxo)alumane Chemical compound [K+].[O-][Al]=O KVOIJEARBNBHHP-UHFFFAOYSA-N 0.000 description 1
- SKFYTVYMYJCRET-UHFFFAOYSA-J potassium;tetrafluoroalumanuide Chemical compound [F-].[F-].[F-].[F-].[Al+3].[K+] SKFYTVYMYJCRET-UHFFFAOYSA-J 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000015424 sodium Nutrition 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000011775 sodium fluoride Substances 0.000 description 1
- 235000013024 sodium fluoride Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
- B22D7/10—Hot tops therefor
- B22D7/104—Hot tops therefor from exothermic material only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
- B22D7/10—Hot tops therefor
Definitions
- This invention relates to self drying aluminium- containing compositions, and in particular to shaped self drying aluminium-containing compositions for use in the casting of molten metals.
- the exothermic compositions generally rely on an aluminothermic reaction for their exothermic properties, and usually contain aluminium, an oxidising agent and a fluoride to reduce the temperature at which reaction between the aluminium and the oxidising agent commences.
- Some heat insulating compositions may also contain aluminium, particularly compositions used in the casting of steel.
- Exothermic insulating compositions are also known containing aluminium and oxidising agents which react without the presence of fluorides.
- Such aluminium-containing compositions may be used e.g. as a cylindrical sleeve for lining a riser, or as an insert to be located in the mould cavity at a point where directional solidification is to be encouraged, and they may be formed to shape by various methods, most of which involve drying the compositions to remove added water.
- One method of drying the compositions is to utilise the exothermic reaction which takes place between the aluminium and a strong alkali in the presence of an alkali metal nitrate.
- This method is described in British Patent specification 808400 according to which a mixture of finely divided aluminium, an amount of oxidising agent, including alkali metal nitrate well below the amount necessary to react completely with the aluminium to oxidise it completely, a fluoride and water is formed to shape and a small amount of a strongly alkaline solution e.g. of caustic soda, is applied to the shaped composition.
- the reaction on addition of the caustic soda is believed to include the following stages:-
- the hydrogen generated in the first reaction regenerates sodium hydroxide in the second, and a chain reaction is thereby set up so that in practice it is necessary only to apply a few drops of caustic soda solution at a few positions on the shaped composition to bring about the reactions throughout the whole mass and as a result of the heat generated to dry the whole mass.
- a self drying aluminium-containing composition in which the drying of the composition is to be initiated by an alkaline substance characterised in that the composition contains an alkali metal nitrite.
- the quantity of alkali metal nitrite present is preferably 6 - 10 % by weight based on the weight of the dry components of the composition.
- the alkali metal nitrite may be for example sodium nitrite or potassium nitrite.
- the alkaline substance is preferably applied as a solution.
- An aqueous solution is preferred but a solution in ethyl alcohol is also effective.
- suitable alkaline substances are sodium hydroxide, potassiun hydroxide, sodium carbonate, potassium carbonate, sodium aluminate and potassium aluminate.
- composition will contain other components in addition to the aluminium and the alkali metal nitrite.
- the composition will usually contain a proportion of an inert refractory filler such as grog, chamotte, alumina or silica, an oxidising agent such as iron oxide or manganese dioxide, and a fluoride such as sodium fluoride, potassium fluoride, sodium aluminium fluoride or potassium aluminium fluoride, and the quantity of aluminium present will be such that only a proportion is utilised in the self drying reaction the remainder being utilised by reaction with the oxidising agent to produce heat.
- an inert refractory filler such as grog, chamotte, alumina or silica
- an oxidising agent such as iron oxide or manganese dioxide
- a fluoride such as sodium fluoride, potassium fluoride, sodium aluminium fluoride or potassium aluminium fluoride
- the aluminium-containing composition may be an exothermic composition, which, also contains fibres, such as asbestos, calcium silicate fibre, or aluminosilicate fibre, for example as described in British Patents 1 117 977 and 1 218 568.
- the aluminium-containing composition may also be an essentially non-exothermic heat-insulating composition containing for example aluminosilicate fibre, zircon fibre or silica fibre, and optionally a particulate refractory material, for example as described in British Patent 1 283 692.
- the same self drying properties can be obtained using less aluminium and less alkali metal salt.
- similar self drying properties can be obtained from a composition containing about 23% by weight aluminium and 12% by weight sodium nitrate, and one containing about 17% by weight aluminium and 6% by weight sodium nitrite.
- the amount of sodium nitrite used may be considerably less than the equivalent amount of sodium nitrate less ammonia is produced in the self drying reaction despite the fact that 1 molecule of sodium nitrite and 1 molecule of sodium nitrate each produce 1 molecule of ammonia.
- compositions containing residual sodium nitrite are less prone to pick up moisture than are the known compositions which contain residual sodium nitrate.
- the method of the invention is particularly suitable for the production of slabs or sleeves for lining ingot mould hot tops or casting mould risers and also for the production of foundry padding materials which are used to help feed molten metal to those parts of a casting which may be remote from a riser.
- the application of padding materials is described in British Patent 1 240301 and the method of the invention is particularly useful when applied to rammable or mouldable padding materials.
- the method of the invention tray also be used to produce linings for molten metal containing vessels such as ladles and launders.
- a snail proportion of a compound such as boric acid which will passivate the aluminium as described in British Patent 775380.
- the aluminiumcontaining composition in two parts, one part containing the aluminium, and the other the alkali metal nitrite, and mix the two parts together just prior to use. This is particularly desirable at high ambient temperatures of about 25o C and above. Under such conditions a pre-prepared composition containing both the aluminium and the alkali metal nitrite could become unusable during storage due to premature chBnical reaction taking place.
- a steel casting 1 having dimensions 110 mm x 110 mn x 110 mm is produced in a sand mould 2.
- the casting 1 is separated from a cylindrical feeder 3, 100 mm in diameter and 150 mm high by a plate 4, 220 mm high, 110 mm wide and 55 ⁇ rn thick.
- the cylindrical feeder is lined by a refractory heat-insulating sleeve 5.
- a composition according to the invention was produced as follows:-
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Mold Materials And Core Materials (AREA)
- Processing Of Solid Wastes (AREA)
- Floor Finish (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8001860 | 1980-01-19 | ||
| GB8001860 | 1980-01-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0043817A1 true EP0043817A1 (en) | 1982-01-20 |
Family
ID=10510756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80902297A Withdrawn EP0043817A1 (en) | 1980-01-19 | 1980-12-11 | Self drying aluminium-containing compositions |
Country Status (9)
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2134729B1 (es) * | 1996-07-18 | 2000-05-16 | Kemen Recupac Sa | Mejoras introducidas en objeto solicitud patente invencion española n. 9601607 por "procedimiento para fabricacion manguitos exactos y otros elementos de mazarotaje y alimentacion para moldes de fundicion, incluyendo la formulacion para obtencion de dichos manguitos y elementos". |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2490327A (en) * | 1947-10-14 | 1949-12-06 | Peter J Soffel | Exothermically reactive mold insert |
| GB775380A (en) * | 1954-10-22 | 1957-05-22 | Foundry Services Ltd | Improvements in or relating to exothermic mixtures |
| GB808400A (en) * | 1956-01-20 | 1959-02-04 | Foundry Services Ltd | The production of moulded exothermic compositions |
| FR1394847A (fr) * | 1964-02-22 | 1965-04-09 | Mélange exothermique pour la métallurgie | |
| DE2853817C2 (de) * | 1978-12-13 | 1985-06-20 | Erwin Kampf Gmbh & Co Maschinenfabrik, 5276 Wiehl | Vorrichtung zum simultanen, biaxialen Recken von Folienbahnen aus thermoplastischem Kunststoff |
-
1980
- 1980-12-11 JP JP56500122A patent/JPS57500006A/ja active Pending
- 1980-12-11 EP EP80902297A patent/EP0043817A1/en not_active Withdrawn
- 1980-12-11 BR BR8009022A patent/BR8009022A/pt unknown
- 1980-12-11 GB GB8122374A patent/GB2082200A/en not_active Withdrawn
- 1980-12-11 WO PCT/GB1980/000213 patent/WO1981001971A1/en not_active Application Discontinuation
- 1980-12-15 ZA ZA00807842A patent/ZA807842B/xx unknown
- 1980-12-31 KR KR1019800005054A patent/KR830004051A/ko not_active Ceased
-
1981
- 1981-01-15 IT IT8167038A patent/IT8167038A0/it unknown
- 1981-01-19 ES ES498627A patent/ES498627A0/es active Granted
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8101971A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ES8201048A1 (es) | 1981-12-01 |
| ZA807842B (en) | 1981-12-30 |
| IT8167038A0 (it) | 1981-01-15 |
| WO1981001971A1 (en) | 1981-07-23 |
| JPS57500006A (enrdf_load_stackoverflow) | 1982-01-07 |
| BR8009022A (pt) | 1981-11-24 |
| KR830004051A (ko) | 1983-07-06 |
| GB2082200A (en) | 1982-03-03 |
| ES498627A0 (es) | 1981-12-01 |
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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 |
|
| AK | Designated contracting states |
Designated state(s): FR |
|
| 17P | Request for examination filed |
Effective date: 19820120 |
|
| 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: 19830105 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: GOUGH, MICHAEL JOHN |