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DE716226C - Process for the production of chrome magnesia stones - Google Patents

Process for the production of chrome magnesia stones

Info

Publication number
DE716226C
DE716226C DEM138490D DEM0138490D DE716226C DE 716226 C DE716226 C DE 716226C DE M138490 D DEM138490 D DE M138490D DE M0138490 D DEM0138490 D DE M0138490D DE 716226 C DE716226 C DE 716226C
Authority
DE
Germany
Prior art keywords
magnesite
chrome
chrome ore
sintered
production
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
Application number
DEM138490D
Other languages
German (de)
Inventor
Dr-Ing Kamillo Konopicky
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MAGNESITAL GmbH
Original Assignee
MAGNESITAL GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MAGNESITAL GmbH filed Critical MAGNESITAL GmbH
Priority to DEM138490D priority Critical patent/DE716226C/en
Application granted granted Critical
Publication of DE716226C publication Critical patent/DE716226C/en
Expired legal-status Critical Current

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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/42—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on chromites
    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/12—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on chromium oxide
    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/44—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminates

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Description

Verfahren zur Herstellung von Chrommagnesiasteinen Es ist bekannt,- Chrommagnesiasteine durch Vermischen von Chromerz und Sintermagnesit herzustellen. Als Sintermagnesit wurden die üblichen eisenarmen oder eisenhaltigen Sintermagnesite des Handels verwendet. Es wurde auch darauf hingewiesen, daß es zumeist vorteilhaft ist, das Chromerz in überwiegendem Anteil zu verwenden und auch gröber gekörnt in die Mässe einzubringen als den Sintermagnesit. Für das Erzielen hoher Abschreckfestigkeit wurde neuerdings vorgeschlagen, daß Chromerzmagnesitmischungen mit überwiegendem Anteil an Chromerz bestimmten Körnungszusammensetzungen ge-Horchen sollen.Process for the production of chrome magnesia stones It is known - Manufacture chrome magnesia stones by mixing chrome ore and sintered magnesite. The usual low-iron or iron-containing sintered magnesites were used as sintered magnesites used in trade. It has also been suggested that it is mostly beneficial is to use the chrome ore in a predominant proportion and also in a coarser grain to bring in the dimensions than the sintered magnesite. For achieving high quench resistance It has recently been proposed that chromium ore magnesite mixtures with predominant Proportion of chrome ore certain grain compositions should be listened to.

Es wurde gefunden, daß man Chrommagnesitsteine mit wesentlich günstigeren Eigenschaften erhält, wenn man als Sintermagnesit ein Erzeugnis verwendet, welches aus Magnesit und Chromerz erbrannt worden ist. Die Zusammensetzung dieses speziellen Sintermagnesits bzw. das Verhältnis von Rohmagnesit zu Chromerz im Brenngut richtet sich je nach der Zusammensetzung des Chromerzes und insbesondere nach dem Verwendungszweck des fertigen Steines. Der besondere Sintermagnesit nach vorliegender Erfindung hat, von Sonderfällen abgesehen, mehr als 5o0'o Mg0, zumeist um 70% Mg O.It has been found that chromium magnesite stones can be obtained with much cheaper ones Properties obtained when a product is used as sintered magnesite which burned from magnesite and chrome ore. The composition of this special Sintered magnesite or the ratio of raw magnesite to chrome ore in the kiln is aimed depending on the composition of the chrome ore and, in particular, on the intended use of the finished stone. The special sintered magnesite according to the present invention has Apart from special cases, more than 50,000 MgO, mostly around 70% MgO.

Obwohl die chemische Analyse der nach dem Vorschlag der Erfindung hergestellten Chrommagnesiasteine nur wenig oder praktisch gar nicht von jenen abweicht, die aus üblichem Sintermagnesit hergestellt wurden, ist doch eine deutliche Steigerung der Druckerweichung, der Abschreckfestigkeit und insbesondere des Widerstandes bei kombinierter Beanspruchung im Betriebe (Abschreckfestigkeit plus Schlackentränkung) zu beobachten.Although the chemical analysis of the proposed invention produced chrome magnesia stones differ only little or practically not at all from those, made from common sintered magnesite is a significant increase pressure softening, quenching resistance and especially resistance combined stress in the company (quenching resistance plus slag impregnation) to observe.

Bezüglich der analytischen Zusammensetzung des fertigen Erzeugnisses konnten die folgenden Punkte als vorteilhaft erkannt werden: Der Ca 0-Gehalt soll möglichst niedrig sein; ebenso soll der Fe. OB-Gehalt tunlichst niedrig gehalten werden. Diese Bedingungen können ohne Schwierigkeit durch zweckentsprechende Auswahl der zur Verwendung kommenden Rohstoffe eingehalten werden. Als besonders vorteilhaft erwies sich die Verweaidung eines Sintermagnesits,welcher auseisen-' armen, nicht oder schwer sinterfähigem Ralimagnesit unter Zusatz von Chromerz in bekannter Weise erbrannt wurde. Es wurde ferner auch beobachtet, daß es in vielen Fällen, im Gegensatz zu der bisherigen Anschauung, von Vorteil ist, wenn der verwendete spezielle Sintermagnesit wesentliche :Mengen an Kieselsäure enthält, so daß z. B. stark durch Kieselsäure verunreinigte, nicht sinterfähige Rohmagnesite herangezogen werden korinen.Regarding the analytical composition of the finished product the following points could be recognized as advantageous: The Ca 0 content should be as low as possible; likewise should the Fe. OB salary kept as low as possible will. These conditions can without difficulty through appropriate Selection of the raw materials to be used are complied with. As special The use of a sintered magnesite proved to be advantageous, which poor ralimagnesite, which cannot be sintered or is difficult to sinter, with the addition of chrome ore in known to be burned. It has also been observed that in many Cases, contrary to the previous view, it is advantageous if the used special sintered magnesite essential: contains amounts of silica, so that z. B. Raw magnesite heavily contaminated by silica and not capable of sintering is used become korines.

Für die Herstellung der Chrommagnesiasteine nach dem vorgeschlagenen Verfahrenkönnen selbstverständlich alle bekannten körnungstechnischen Maßnahmen herangezogen werden. Wenn sich auch die Menge des Chromerzes in der Mischung nach dem Verivendungsziveclt und zum Teil auch nach der Zusammensetzung des verwendeten speziellen Sintermagnesits richtet, so ergibt sich doch in den meisten Fällen ein Zusatz von 35 bis 6o% Chromerz. Ebenso ist es zumeist vorteilhaft, die schon früher gegebene Regel anzuwenden, das Chromerz gröber (etwa über 2 mm) und den Sintermagnesit feiner gemahlen (etwa o bis 1/2 mm) zu verwenden. Jedenfalls ist es durchaus nicht notwendig für die Erzielung günstiger Eigenschaften, den Chronierzanteil größer zu Balten als den Anteil. an Sintermagnesit.For the production of the chrome magnesia stones according to the proposed Of course, all known granulating measures can be used can be used. Even if the amount of chrome ore in the mixture changes the level of use and, in part, also according to the composition of the material used special sintered magnesite, it results in most cases Addition of 35 to 60% chrome ore. Likewise, it is mostly beneficial to do that earlier to apply the given rule, the chrome ore coarser (about 2 mm) and the sintered magnesite to use finer ground (about o to 1/2 mm). In any case, it is not at all necessary for the achievement of favorable properties, the proportion of chronic ore is greater to Baltic as the share. on sintered magnesite.

Ausführungsbeispiel 4. Teile eines Rohmagnesits der Zusammensetzung 5o,oofo Glühverlust, 3,3% Si02, 0,2% Al. 03, 0,2% Fee 03, 0,5al`o C a0, 45,8% Mg0 wurden mit einem Teil eines Chromerzes der Zusammensetzung Si02 ...... 5,30/0, Al. O; ...... 18,9%, Fee 03 ...... 16,20/0, Cr. 03 ..... 39,60/0, Ca0 ...... 0,7,0/0, Mg 0 ...... 18,3'%, gemischt, fein gemahlen und in einem Rotierofen bei etwa 1700° gesintert. Der erhaltene Sinter war dunkel, porös, aber doch ziemlich fest. Er hatte die Zusammensetzung :iiÜ@ ....... h,'';'0, A12Oü ...... 6,6%, F020;, ..... 5,70;'o, Cr2 0g ..... 13,2()/0, Ca 0 ...... 0,7 0,`o, Mg 0 ...... 67.2 @to . 'Gleiche Teile des Chromerzes in der Körnung 2 bis 8 mm und des obigen Sintermagnesits, auf o bis 1w mm gemahlen, wurden vermischt, angefeuchtet und zu Steinen verpreßt. Die gebrannten Steine hatten die Zusammensetzung. Si02 ...... 5,8 ojo, A1203 ...... 12,80/0, Fe. 03 ..... i i,o%, Cr. 03 ..... 26,404, Ca0 ...... 0,4%, M90 ...... 42,7 % . Die Abschreckprüfung ergab, daß nach sieben Luftabschreckungen die Festigkeit nur um etu-a 2010 abgenommen hatte, während Chrommagnesiasteine aus Chromerz und üblichem Sintermagnesit mit fast gleicher analytischer Zusammensetzung und der gleichen Körnung nach sieben Luftabschreckungen eine Festigkeitsabnahme von etwa 17V0 zeigten.Embodiment 4. Parts of a raw magnesite of the composition 5o, oofo loss on ignition, 3.3% Si02, 0.2% Al. 03, 0.2% fee 03, 0.5al`o C a0, 45.8% Mg0 were with part of a chrome ore of the composition Si02 ...... 5.30 / 0, Al. O ; ...... 18.9%, Fee 03 ...... 16.20 / 0, Cr. 03 ..... 39.60 / 0, Ca0 ...... 0.7.0 / 0, Mg 0 ...... 18.3%, mixed, finely ground and sintered in a rotary kiln at around 1700 °. The sinter obtained was dark, porous, but still quite firm. He had the composition : iiÜ @ ....... h, '';'0, A12Oü ...... 6.6%, F020 ;, ..... 5.70; 'o, Cr2 0g ..... 13.2 () / 0, Ca 0 ...... 0.7 0, `o, Mg 0 ...... 67.2 @to. Equal parts of the chrome ore with a grain size of 2 to 8 mm and of the above sintered magnesite, ground to 0 to 1 mm, were mixed, moistened and pressed into stones. The fired stones had the composition. Si02 ...... 5.8 ojo, A1203 ...... 12.80 / 0, Fe. 03 ..... ii, o%, Cr. 03 ..... 26.404, Ca0 ...... 0.4%, M90 ...... 42.7 % . The quenching test showed that after seven air quenching the strength had only decreased by etu-a 2010, while chrome magnesia stones made of chrome ore and common sintered magnesite with almost the same analytical composition and the same grain size showed a strength decrease of about 17V0 after seven air quenching.

Claims (6)

I'ATENTANS1'RÜC'HE: 1. Verfahren zum Herstellen von Chrommagnesiasteinen, dadurch gekennzeichnet, daß Chromerz und Magnesia gemeinsam gesintert und dieser Sinter mit weiteren Chromerzmengen vermischt. geformt und gebramit wird. I'ATENTANS1'RÜC'HE: 1. Procedure for the production of chrome magnesia stones, characterized in that chrome ore and magnesia are sintered together and this Sinter mixed with other amounts of chrome ore. is formed and bred. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß von eisenarmen Rohstoffen, insbesondere von eisenarmem Rohmagnesit, ausgegangen wird. 2. Procedure according to claim i, characterized in that low-iron raw materials, in particular low-iron raw magnesite is assumed. 3. Verfahren nach Anspruch i und 2, dadurch gekennzeichnet, daß von kalkarmen Rohstoffen ausgegangen wird. 3. The method according to claim i and 2, characterized in that it is assumed that raw materials are low in lime. Verfahren nach Anspruch i bis 3, dadurch gekennzeichnet, daß von kieselsäurereichen Stoffen, insbesondere von kieselsäurereichem Rohmagnesit. ausgegangen wird. procedure according to claim i to 3, characterized in that of silicic acid-rich substances, especially of silica-rich raw magnesite. is assumed. 5. Verfahren nach Anspruch i bis 4, dadurch gekennzeichnet, daß der aus Rohmagnesit und Chromerz erbramite Sintermagnesit 6o bis 8o % M-0 enthält. 5. Procedure according to claims i to 4, characterized in that that of raw magnesite and chrome ore Bramite sintered magnesite contains 6o to 8o% M-0. 6. Verfahren nach Anspruch i bis 5, dadurch gekennzeichnet, daß 35 bis 6o% Chromerz, vorzugsweise als Grobkorn über 2 mm, und 65 bis 4O% Sintermagnesit, welcher aus Magnesit und Chromerz erbramlL wurde, vorzugsweise auf unter i/2 mm fein zerkleinert verwendet wird.6. The method according to claim i to 5, characterized in that 35 to 60% chrome ore, preferably as coarse grain 2 mm, and 65 to 40% sintered magnesite, which was made from magnesite and chrome ore is preferably used finely ground to less than 1/2 mm.
DEM138490D 1937-07-02 1937-07-02 Process for the production of chrome magnesia stones Expired DE716226C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEM138490D DE716226C (en) 1937-07-02 1937-07-02 Process for the production of chrome magnesia stones

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Application Number Priority Date Filing Date Title
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2671732A (en) * 1950-02-11 1954-03-09 Harbison Walker Refractories Magnesite-chrome refractories
DE1014913B (en) * 1953-08-05 1957-08-29 Russell Pearce Heuer Non-acidic refractory bricks or masses and processes for their manufacture
DE975186C (en) * 1953-02-27 1961-09-21 Dynamidon Werk Engelhorn & Co Process for sintering chrome ore with subsequent processing of the sintered material into chrome magnesite stones
DE1257655B (en) * 1964-04-22 1967-12-28 Oesterr Amerikan Magnesit Process for the production of refractory chromium and chromium magnesite bricks
DE1275934B (en) * 1962-03-29 1968-08-22 Harbison Walker Refractories Process for the production of a fired, basic refractory molded article
DE1646838B1 (en) * 1965-10-07 1971-09-30 Oesterr Amerikan Magnesit METHOD OF MANUFACTURING REFRACTORY BURNED MAGNESITE CHROME AND CHROME MAGNESITE STONES

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2671732A (en) * 1950-02-11 1954-03-09 Harbison Walker Refractories Magnesite-chrome refractories
DE975186C (en) * 1953-02-27 1961-09-21 Dynamidon Werk Engelhorn & Co Process for sintering chrome ore with subsequent processing of the sintered material into chrome magnesite stones
DE1014913B (en) * 1953-08-05 1957-08-29 Russell Pearce Heuer Non-acidic refractory bricks or masses and processes for their manufacture
DE1275934B (en) * 1962-03-29 1968-08-22 Harbison Walker Refractories Process for the production of a fired, basic refractory molded article
DE1257655B (en) * 1964-04-22 1967-12-28 Oesterr Amerikan Magnesit Process for the production of refractory chromium and chromium magnesite bricks
DE1646838B1 (en) * 1965-10-07 1971-09-30 Oesterr Amerikan Magnesit METHOD OF MANUFACTURING REFRACTORY BURNED MAGNESITE CHROME AND CHROME MAGNESITE STONES

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