DEP0032895DA - Covering and cleaning salt for foundry purposes. - Google Patents
Covering and cleaning salt for foundry purposes.Info
- Publication number
- DEP0032895DA DEP0032895DA DEP0032895DA DE P0032895D A DEP0032895D A DE P0032895DA DE P0032895D A DEP0032895D A DE P0032895DA
- Authority
- DE
- Germany
- Prior art keywords
- salt
- covering
- water
- cleaning salt
- foundry purposes
- 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.)
- Expired
Links
- 150000003839 salts Chemical class 0.000 title claims description 13
- 238000004140 cleaning Methods 0.000 title claims description 5
- DHAHRLDIUIPTCJ-UHFFFAOYSA-K aluminium metaphosphate Chemical compound [Al+3].[O-]P(=O)=O.[O-]P(=O)=O.[O-]P(=O)=O DHAHRLDIUIPTCJ-UHFFFAOYSA-K 0.000 claims description 3
- 229910021538 borax Inorganic materials 0.000 description 6
- 239000004328 sodium tetraborate Substances 0.000 description 6
- 235000010339 sodium tetraborate Nutrition 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 159000000000 sodium salts Chemical class 0.000 description 2
- MOMKYJPSVWEWPM-UHFFFAOYSA-N 4-(chloromethyl)-2-(4-methylphenyl)-1,3-thiazole Chemical compound C1=CC(C)=CC=C1C1=NC(CCl)=CS1 MOMKYJPSVWEWPM-UHFFFAOYSA-N 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000037406 food intake Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 150000003017 phosphorus Chemical class 0.000 description 1
- 235000008001 rakum palm Nutrition 0.000 description 1
- AQMNWCRSESPIJM-UHFFFAOYSA-M sodium metaphosphate Chemical compound [Na+].[O-]P(=O)=O AQMNWCRSESPIJM-UHFFFAOYSA-M 0.000 description 1
- 235000019983 sodium metaphosphate Nutrition 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
Description
CHEMISCHE WERKE ALBERT WIESBADEN-BIEBRICHCHEMICAL WORKS ALBERT WIESBADEN-BIEBRICH
Patent - AbteilungPatent Department
Patentanmeldung ρ 52 895 I7a/31c DPatent application ρ 52 895 I7a / 31c D
'-Yw-I" w und äug,—'-- Abdeck~und Reinigungssalz für Giessereizwecke."'-Yw-I "w and ey, --'-- Covering and cleaning salt for foundry purposes."
28.1.49.28.1.49.
Für hochwertige Giessereiprodukte ist die Wahl des beim Giessprozess verwendeten P^einigungs- und Abdecksalzes für die Qualität des !Fertigproduktes τοπ ausschlaggebender Bedeutimg. Beispielsv/eise wird für die Herstellung von Bleibronzen, die bekanntlich sehr empfindlich gegenüber Gasen und Wasserdampf sind, Borax als Abdecksala verwendet. Jedoch kann, dieses Salz nur unter bestimmten Voraussetzungen, wie ein- oder mehrfaches Umschmelzen um es wasserfrei zu machen, verwendet werden. Weiterhin verliert es durch Lagern an der Luft durch Wasser auf nähme seine Gebrauchsfähigkeit und muss vor Gebrauch wieder umgeschmolzen werden. Dadurch wird nicht nur Energie und Zeit benötigt, sondern das Salz wird durch Aufnahme von Ofenfutter bereits vor seiner Verwendung als Abdecksalz verunreinigt, wodurch seine Verwendungsdauer verkürzt wird. Durch Aufnahme von Oxyden wird Borax sehr schnell zähflüssig und dadurch unbrauchbar, sodassFor high-quality foundry products, the choice of the cleaning and covering salt used in the casting process is of decisive importance for the quality of the finished product. For example, borax is used as a cover sala for the production of lead bronzes, which are known to be very sensitive to gases and water vapor. However, this salt can only be used under certain conditions, such as single or multiple remelting to make it anhydrous. Furthermore, if it is stored in the air, it loses its usability due to water and has to be remelted before use. As a result, not only is energy and time required, but the salt is contaminated by the ingestion of oven fodder even before it is used as a covering salt, which shortens its useful life. By absorbing oxides, borax quickly becomes viscous and therefore unusable, so
Blatt 2 zur Patentanmeldung ρ 52 895 IYa/31 c I)Sheet 2 for patent application ρ 52 895 IYa / 31 c I)
nur ein Seil des wirksamen Salzes ausgenutzt werden kann. Da der Zustand des Boraxsalzes ml genau festliegt, ergeben Schmelzen mit Boraxabdeckungen nie Ja. t genügend treffsichere, einwandfreie G-iessprodukte.only one rope of the effective salt can be used. Since the state of the borax salt ml is precisely defined, Melting with borax covers never yields yes. t enough accurate, flawless G-iess products.
Diese Schwierigkeiten werden erfindungsgemäss behoben, indem man als Abdeek- und Heinigungssalz wasserunlösliches Kaliumnietaphosphat, sogenanntes Kurrol'sches Salz verwendet. Der Schmelzpunkt des Ealiummetaphosphat kann hierbei durch Zusätee von latriumsalzen ausgenommen Hatriummetaphosphat, bis etwa 600° D herabgesetzt werden, wodurch gleichzeitigleine grössere Dünnflüssigkeit erreicht wird. Diese Eigenschaft des Kaliummetaphosphats, mit Natriumsalzen niedriger viskose Schmelzen zu geben, ermöglicht seine besonders gute Ausnutzbarkeit bei der erfindungsgemässen Anwendung, indem es nämlich, sobald es durch hohe Aufnahme von Oxyden zu zähflüssig geworden ist,durch -Zusatz von Hatriumsalz, beispielsweise natriumsulfat, wieder auf die anfängliche Dünnflüssigkeit zurückgeführt werden kann. Die Aufarbeitung des verbrauchten Salzes auf reines Phosphorsalz und Metalle bietet keine Schwierigkeiten.According to the invention, these difficulties are eliminated by using water-insoluble potassium nietaphosphate, so-called Kurrol's salt, as the tipping and cleaning salt. The melting point of the aluminum metaphosphate can be reduced to about 600 ° D by adding sodium salts with the exception of sodium metaphosphate, whereby a greater thin liquid is achieved at the same time. This property of potassium m etaphosphats to give with sodium salts of low viscous melts, allowing it particularly good exploitability in the inventive application by it as soon as it has become through high intake of oxides too viscous namely, such as sodium sulfate by -Zusatz of Hatriumsalz, can be traced back to the initial thin liquid. The work-up of the used salt to give pure phosphorus salt and metals does not present any difficulties.
Der Vorteil des erfindungsgemäss verwendeten wasserunlöslichen Ealiummetaphosphats besteht darin, dass es beim lagern in feuchter Luft kein Wasser aufnimmt, im G-egensatz zu Borax, das entweder mit Kristallwasser vorliegt oder umgeschmolzen als Glas hygroskopisch ist. Auch nach beliebig häufigem Umschmelzen behält es seine wasserunlösliche Eigenschaft bei, sodass sein Zustand immer genau festgelegt ist, nämlich dadurch, dass es keinerlei Wasser enthält.The advantage of the water-insoluble aluminum metaphosphate used according to the invention is that it Does not absorb water when stored in moist air, in contrast to borax, which is either present with crystal water or remelted as glass is hygroscopic. Even after being remelted any number of times, it retains its water-insolubility Property, so that its state is always precisely defined, namely by the fact that there is no Contains water.
Bei einem mittels des 'fauchverfahrens hergestellten Bleibronzestahl-Yerbundguss γ/urde als Abdecksalz Kurrol'sches Ealiummetaphosphat verwendet, das einige Wochen in feuehter Atmosphäre gelegen hatte. Das Salz wurde ohneIn the case of a lead bronze steel composite cast made by means of the 'Fauch process' γ / was used as a covering salt Kurrol's Ealiummetaphosphat, which several weeks in feuehter Atmosphere. The salt was without
Blatt 3 zur Patentanmeldung ρ 32895 IYa/3lc DSheet 3 for patent application ρ 32895 IYa / 3lc D
vorheriges Umschmelzen verwendet. Yon den 10 hergestellten Verbundgussücken waren sämtlicne einwandfrei. Vergleichsweise wurden 10 weitere ffussücke unter Verwendung von Borax, das in demselben Eausa. gelagert hatte und bereits zur Entwässerung uiage schmolz en war, hergestellt. Yon den 10 Stück waren nur 4· in Ordnung, 6 Stück waren porös.previous remelting used. All of the 10 composite castings produced were flawless. By way of comparison, 10 additional fugitives were made using borax, which was found in the same Eausa. had stored and it was already melted for drainage. Of the 10 pieces, only 4 were okay, 6 pieces were porous.
Claims (1)
Family
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