DEP0053609DA - Process for the production of magnetizable iron oxides - Google Patents
Process for the production of magnetizable iron oxidesInfo
- Publication number
- DEP0053609DA DEP0053609DA DEP0053609DA DE P0053609D A DEP0053609D A DE P0053609DA DE P0053609D A DEP0053609D A DE P0053609DA
- Authority
- DE
- Germany
- Prior art keywords
- ferric oxide
- iron oxides
- production
- magnetizable iron
- oxidation
- 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
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 6
- 235000013980 iron oxide Nutrition 0.000 title claims description 5
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 title claims description 5
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 11
- 230000003647 oxidation Effects 0.000 claims description 7
- 238000007254 oxidation reaction Methods 0.000 claims description 7
- 239000000969 carrier Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- 229940087654 iron carbonyl Drugs 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Description
Zur Herstellung von Tonträgern für das magnetographische Tonaufzeichnungs- und -wiedergabeverfahren benötigt magnetisierbare Stoffe, an die hinsichtlich Remanenz, Koerzitivkraft und Teilchengrösse besondere Anforderungen gestellt werden. Magnetisierbare Eisenoxyde werden hierfür bevorzugt verwendet.For the production of sound carriers for the magnetographic sound recording and playback process, magnetizable substances are required, which are subject to special requirements with regard to remanence, coercive force and particle size. Magnetizable iron oxides are preferably used for this.
Es wurde nun gefunden, dass sich für diesen Zweck solche magnetisierbaren Eisenoxyde besonders gut eignen, die durch Behandeln von Ferrioxyd mit reduzierenden Gasen in der Hitze und nachträgliche Oxydation unter Bildung von (Gamma)-Ferrioxyd erhalten wurden. Als reduzierende Gase kann man z.B. Wasserstoff oder Kohlenoxyd verwenden. Die Temperatur richtet sich nach der Reaktionsfähigkeit des verwendeten Ferrioxyds; sie liegt im allgemeinen zwischen etwa 250° und 450°.It has now been found that such magnetizable iron oxides are particularly suitable for this purpose, which were obtained by treating ferric oxide with reducing gases in the heat and subsequent oxidation with the formation of (gamma) ferric oxide. Hydrogen or carbon monoxide, for example, can be used as reducing gases. The temperature depends on the reactivity of the ferric oxide used; it is generally between about 250 ° and 450 °.
Die nachträgliche Oxydation führt man zweckmässig anschliessend in dem gleichen Ofen durch, am einfachsten dadurch, dass man Luft bei einer Temperatur von etwa 200° hindurchleitet, wobei man Temperaturerhöhungen zweckmässig vermeidet. Es ist auch möglich, die Oxydation in einer Schmelze von Sauerstoff abgebenden Mitteln, wie Alkalinitraten, durchzuführen, auch kann man die Oxydation in Suspension mit Hilfe von Persulfat oder Hypochlorit ausführen.The subsequent oxidation is then expediently carried out in the same furnace, the simplest way of doing this by passing air at a temperature of about 200 ° through it, expediently avoiding temperature increases. It is also possible to carry out the oxidation in a melt of oxygen-releasing agents such as alkali nitrates; the oxidation can also be carried out in suspension with the aid of persulphate or hypochlorite.
Als Ausgangsstoffe eignen sich die durch Fällen aus Eisensalzlösungen oder durch Verbrennen von Eisencarbonyl erhaltenen Ferrioxyde besonders gut. Auch kann man von einem durch Oxidation von Ferroferrioxyd erhaltenen Ferrioxyd ausgehen, dessen Eigenschaften für Magnetogrammträger noch nicht ganz befriedigten.The ferric oxides obtained by precipitation from iron salt solutions or by burning iron carbonyl are particularly suitable as starting materials. One can also start from a ferric oxide obtained by oxidation of ferroferrioxide, the properties of which are not yet entirely satisfactory for magnetogram carriers.
Die nach dem vorliegenden Verfahren erhaltenen Eisenoxyde ergeben infolge ihrer hohen Koerzitivkraft und des guten Ver- hältnisses zwischen Koerzitivkraft, Remanenz und Permeabilität, mit unmagnetischen Bindemitteln verarbeitet, sehr gute Magnetogrammträger.The iron oxides obtained by the present process give due to their high coercive force and good consistency ratio between coercive force, remanence and permeability, processed with non-magnetic binders, very good magnetogram carrier.
Beispielexample
In einen flachen elektrisch heizbaren Ofen von etwa 1 m(exp)3 Inhalt werden 75 kg eines durch Verbrennen von Eisencarbonyl erhaltenen (Alpha)-Ferrioxyds eingefüllt. Dann wird der Ofen auf 350° aufgeheizt, wobei ein schwacher Stickstoffstrom hindurchgeleitet wird. Nach Erreichen dieser Temperatur wird der Stickstoffstrom abgestellt und unter Aufrechterhaltung der Temperatur ein Wasserstoffstrom acht Stunden lang mit einer Strömungsgeschwindigkeit von etwa 2 m(exp)3 je Stunde über das Ferrioxyd geleitet. Darauf wird der Ofen auf 200° abgekühlt, gründlich mit Stickstoff gespült und bei 200° acht Stunden lang ein Luftstrom, dem man langsam ansteigend eine Strömungsgeschwindigkeit von bis zu 3 m(exp)3 je Stunde erteilt, durch den Ofen geschickt. Nach dem Erkalten des Ofens wird das erhaltene, pulverförmige, gelbbraune (Gamma)-Ferrioxyd zu einem Magnetogrammträger verarbeitet, indem man es in bekannter Weise mit Hilfe eines unmagnetischen Bindemittels auf eine Trägerfolie aufbringt.75 kg of an (alpha) ferric oxide obtained by burning iron carbonyl are placed in a flat, electrically heatable furnace with a capacity of about 1 m (exp) 3. The furnace is then heated to 350 °, a gentle stream of nitrogen being passed through it. After this temperature has been reached, the nitrogen flow is switched off and, while maintaining the temperature, a hydrogen flow is passed over the ferric oxide for eight hours at a flow rate of about 2 m (exp) 3 per hour. The furnace is then cooled to 200 °, flushed thoroughly with nitrogen and a stream of air at 200 ° for eight hours, which is given a slowly increasing flow rate of up to 3 m (exp) 3 per hour, is sent through the furnace. After the oven has cooled down, the powdery, yellow-brown (gamma) ferric oxide obtained is processed into a magnetogram carrier by applying it to a carrier film in a known manner with the aid of a non-magnetic binder.
Claims (3)
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