DE2644038A1 - Sintered magnesia for use in mfg. refractories - made from mixt. of natural and synthetic magnesia, which improves the refractories - Google Patents

Sintered magnesia for use in mfg. refractories - made from mixt. of natural and synthetic magnesia, which improves the refractories

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Publication number
DE2644038A1
DE2644038A1 DE19762644038 DE2644038A DE2644038A1 DE 2644038 A1 DE2644038 A1 DE 2644038A1 DE 19762644038 DE19762644038 DE 19762644038 DE 2644038 A DE2644038 A DE 2644038A DE 2644038 A1 DE2644038 A1 DE 2644038A1
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DE
Germany
Prior art keywords
magnesia
natural
refractories
mgo
mixt
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.)
Pending
Application number
DE19762644038
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German (de)
Inventor
Josef Prof Dipl Ing Staron
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.)
CONTINENTALE ERZGESELLSCHAFT M
Original Assignee
CONTINENTALE ERZGESELLSCHAFT M
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 CONTINENTALE ERZGESELLSCHAFT M filed Critical CONTINENTALE ERZGESELLSCHAFT M
Priority to DE19762644038 priority Critical patent/DE2644038A1/en
Publication of DE2644038A1 publication Critical patent/DE2644038A1/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F5/00—Compounds of magnesium
    • C01F5/02—Magnesia
    • C01F5/06—Magnesia by thermal decomposition of magnesium compounds
    • 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
    • C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
    • C04B35/043—Refractories from grain sized mixtures
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/32—Thermal properties

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

A mixt. is made of (a) synthetic-magnesite or -magnesia; and (b) natural-magnesite or -magnesium hydroxide; and the mixt. is calcined to form MgO. The mixt. pref. has an (a):(b) ratio of 95:5 to 80-20. The MgO obtd. has improved refractory properties, and a higher strength and density. Synthetic MgO, obtd. e.g. from seawater, has a higher purity than natural MgO, so improved refractory properties are obtd. Conversely, natural MgO promotes the formation of periclase, which increases the mechanical strength and the density of the refractory materials made using the MgO. The invention combines the advantages of the two materials.

Description

Verfahren zum Herstellen von Magnesia als Ausgangs stoffProcess for the production of magnesia as a starting material

feuerfester Werkstoffe Die Erfindung betrifft ein Verfahren zum Herstellen von Magnesia als Ausgangsstoff feuerfester Werkstoffe, z.B. feuerfester Steine und feuerfester Auskleidung. Es ist bekannt, für solche Zwecke Magnesia (Magnesiumoxyd) herzustellen durch Brennen von natürlichem Magnesit (Magnesiumkarbonat). Es ist ebenfalls bekannt, für solche Zwecke Magnesia durch Brennen von Magnesit herzustellen, das synthetisch, beispielsweise aus Meerwasser, gewonnen wird. Synthetisch gewonnene Magnesia hat gegenüber Magnesia, die aus natürlichem Magnesit gewonnen ist, den Vorteil größerer Reinheit. Reine Magnesia hat gegenüber verunreinigter Magnesia den Vorteil höherer Feuerfestigkeit. Aus natürlichem Magnesit gewonnene Magnesia hat gegenüber synthetisch erzeugter Magnesia den Vorteil einer Kristallstruktur, die die Periklasbildung fördert und entsprechende größere mechanische Festigkeit und, wichtiger noch, bessere Eigenschaften der daraus hergestellten feuerfesten Werkstoffe ermöglicht. Refractory Materials The invention relates to a method of manufacturing of magnesia as a raw material for refractory materials, e.g. refractory bricks and refractory lining. It is known to use magnesia (magnesium oxide) for such purposes produced by burning natural magnesite (magnesium carbonate). It is also known to produce magnesia for such purposes by burning magnesite, which is obtained synthetically, for example from seawater. Synthetically obtained Magnesia has the opposite of magnesia obtained from natural magnesite Advantage of greater purity. Pure magnesia is different from contaminated magnesia the advantage of higher fire resistance. Magnesia extracted from natural magnesite has the advantage of a crystal structure compared to synthetically produced magnesia, which promotes periclase formation and corresponding greater mechanical strength and, more importantly, better properties of the refractories made from them Materials made possible.

Aufgabe der Erfindung ist es, Magnesia herzustellen, die sowohl den Vorteil hoher Feuerfestigkeit infolge größerer Reinheit als auch den Vorteil der auf der Periklas-Kristallstruktur beruhenden Qualität von mechanischer Festigkeit und Dichte der daraus hergestellten feuerfesten Werkstoffe hat.The object of the invention is to produce magnesia that both the Advantage of high fire resistance due to greater purity as well as the advantage of the mechanical quality based on the periclase crystal structure Has the strength and density of the refractory materials made from it.

Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, daß synthetisch hergestellter Magnesit mit natürlichem Magnesit oder Magnesiumhydrat gemischt und die Mischung zu Magnesia gebrannt wird. Wenngleich auch schon kleine Beimischungen genügen, empfiehlt sich doch ein Mischungsverhältnis zwischen synthetischem Magnesit und natürlichem Magnesit oder Magnesiumhydrat von etwa 95 : 5 bis 80 : 20.According to the invention, this object is achieved in that synthetically manufactured magnesite mixed with natural magnesite or magnesium hydrate and the mixture is burned to magnesia. Even if there are already small admixtures suffice, a mixture ratio between synthetic magnesite is recommended and natural magnesite or magnesium hydrate from about 95: 5 to 80:20.

Es hat sich ferner gezeigt, daß der Zusatz von natürlichem Magnesit sowohl in Form von kaustisch gebranntem Material als auch im rohen Zustand möglich ist. Die Vorteile kaustisch gebranntem Magnesits liegen bekanntlich darin, daß eine Gasbildung vorweggenommen ist und hierdurch die Briketts beim Brand nicht belastet werden und erheblich besser den Ofen verlassen.It has also been shown that the addition of natural magnesite possible in the form of caustic fired material as well as in the raw state is. The advantages of caustic magnesite are known to be that one Gas formation is anticipated and as a result, the briquettes are not burdened in the event of a fire and leave the oven much better.

Die folgenden Beispiele sind sowohl mit Zusätzen von eisenarmem wie eisenreichem Magnesit gemacht worden. In beiden Fällen ist das Kristallwachstum erheblich begünstigt worden.The following examples are both with additions of low iron and iron-rich magnesite. In both cases there is crystal growth has been significantly favored.

Beispiel 1: 92 Gewichtsteile einer Seewassermagnesia mit 97 % MgO wurden mit 8 Gewichtsteilen einer kaustischen Magnesia gemischt, die aus Naturmagnesit mit einem Fe203-Gehalt von ca. 8 % hergestellt war. Die Mischung würde in einem periodischen, gasbefeuerten Ofen bei 17400C über 2 Stunden gebrannt. Die erzeugte Magnesia hatte folgende Gehalte in Gewichtsprozent: MgO 96,81 % SiO2 0,42 % A1203 0,21 % Fe203 0,58 % CaO 1,14 %.Example 1: 92 parts by weight of seawater magnesia with 97% MgO were mixed with 8 parts by weight of a caustic magnesia made from natural magnesite with an Fe 2 O 3 content of approx. 8%. The mix would be in one periodic, gas-fired furnace fired at 17400C for 2 hours. The generated Magnesia had the following percentages by weight: MgO 96.81% SiO2 0.42% A1203 0.21% Fe203 0.58% CaO 1.14%.

Beispiel 2: Desgleichen wurden 92 Gewichtsteile einer Seewassermagnesia mit 97 % MgO mit 8 Gewichtsteilen einer kaustischen Magnesia gemischt, die aus Naturmagnesit- mit einem Fe203-Gehalt von 0,06 % hergestellt war. Die Mischung wurde in einem periodischen gasbefeuerten Ofen bei 17400C über 2 Stunden gebrannt.Example 2: Likewise, there was 92 parts by weight of a seawater magnesia with 97% MgO mixed with 8 parts by weight of a caustic magnesia, which is made from natural magnesite with an Fe 2 O 3 content of 0.06%. The mixture was made on a periodic basis Fired in a gas-fired furnace at 17400C for 2 hours.

Die erzeugte Magnesia hatte folgende Gehalte in Gewichtsprozent: MgO 9t,11 % Si02 0,58 % A1203 0,18 % Fe203 0,lS % Ca0 $,63 %.The magnesia produced had the following contents in percent by weight: MgO 9t, 11% Si02 0.58% A1203 0.18% Fe203 0.15% Ca0 $, 63%.

Das Ergebnis war in beiden Fällen eine Sintermagnesia mit erheblich stärkerer Periklasausbnldung als Vergleichsversuche mit dem obengeschilderten Seewassermagnesit zeigten.The result in both cases was sintered magnesia with considerable stronger periclase formation than comparative experiments with the seawater magnesite described above showed.

Das Mischungsverhältnis von synthetischem und natürlichem Magnesit kann entsprechend den gewünschten Ergebnissen weitgehend gegenüber den vorstehenden Angaben erweitert werden, z.B. bis zu dem Verhältnis 50 : 50 und sogar darüber hinaus.The mixing ratio of synthetic and natural magnesite can be largely compared to the above according to the desired results Information can be extended, e.g. up to the ratio 50:50 and even beyond.

Patentansprtlche: Patent claims:

Claims (2)

Patentansprüche: Verfahren zum Herstellen von Sintermagnesia als Ausgangsstoff fester Werkstoffe, dadurch gekennzeichnet, daß synthetisch hergestellter Magnesit oder synthetisch hergestellte Magnesia mit natürlichem Magnesit oder Magnesiumhydrat gemischt und zu Sintermagnesia gebrannt wird. Claims: Method for producing sintered magnesia as Starting material of solid materials, characterized in that synthetically produced Magnesite or synthetically produced magnesia with natural magnesite or magnesium hydrate mixed and burned to sintered magnesia. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Mischungsverhältnis von synthetischem und natürlichem Magnesit oder Magnesiumhydrat bei etwa 95 : 5 bis 80 : 20 liegt.2. The method according to claim 1, characterized in that the mixing ratio of synthetic and natural magnesite or magnesium hydrate at about 95: 5 up to 80:20.
DE19762644038 1976-09-30 1976-09-30 Sintered magnesia for use in mfg. refractories - made from mixt. of natural and synthetic magnesia, which improves the refractories Pending DE2644038A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19762644038 DE2644038A1 (en) 1976-09-30 1976-09-30 Sintered magnesia for use in mfg. refractories - made from mixt. of natural and synthetic magnesia, which improves the refractories

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762644038 DE2644038A1 (en) 1976-09-30 1976-09-30 Sintered magnesia for use in mfg. refractories - made from mixt. of natural and synthetic magnesia, which improves the refractories

Publications (1)

Publication Number Publication Date
DE2644038A1 true DE2644038A1 (en) 1978-04-06

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DE (1) DE2644038A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0140221A2 (en) * 1983-10-31 1985-05-08 Shin Nihon Chemical Industry Co., Ltd. Magnesia clinker and method of producing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0140221A2 (en) * 1983-10-31 1985-05-08 Shin Nihon Chemical Industry Co., Ltd. Magnesia clinker and method of producing the same
EP0140221A3 (en) * 1983-10-31 1987-01-07 Shin Nihon Chemical Industry Co., Ltd. Magnesia clinker and method of producing the same

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