DD154096B1 - PROCESS FOR PREPARING ACTIVE TECHNICAL MAGNESIUM OXIDE - Google Patents
PROCESS FOR PREPARING ACTIVE TECHNICAL MAGNESIUM OXIDE Download PDFInfo
- Publication number
- DD154096B1 DD154096B1 DD22493680A DD22493680A DD154096B1 DD 154096 B1 DD154096 B1 DD 154096B1 DD 22493680 A DD22493680 A DD 22493680A DD 22493680 A DD22493680 A DD 22493680A DD 154096 B1 DD154096 B1 DD 154096B1
- Authority
- DD
- German Democratic Republic
- Prior art keywords
- magnesium oxide
- active
- magnesium
- oxide
- filler
- Prior art date
Links
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
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Description
Nach dem Brechen wird das Rohmagnesitgestein bei ca. 8000C im Schachtofen oder Drehofen gebrannt, wobei die genaue Temperaturführung an die Verweilzeit des Magnesits in der Brennzone des Ofens anzupassen ist. Die Einstellung der notwendigen Brennbedingungen, insbesondere des Temperaturbereiches, wird kinetisch, d. h. durch Ermitteln der Lösegeschwindigkeit einer Branntgutprobe in Säure, die möglichst hoch sein muß, festgelegt. Das aus dem Brennofen ausgetragene Branntgut, das infolge der schonenden Brennbedingungen noch ca. 3 bis 4 Ma.-% gebundenes CO2 enthält, wird nach dem Abkühlen auf dem Brecher grobzerkleinert und auf einer Federrollenmühle mit Sichter feingemahlen und gesichtet. Im Teilchengrößenbereich von 0,000 bis 0,100mm Durchmesser wurden an ausgesichteten Branntmagnesitfraktionen folgende spezifische Oberflächen nach BET gemessen:After breaking the Rohmagnesitgestein is fired at about 800 0 C in a shaft furnace or rotary kiln, and the precise temperature control is adapted to the residence time of the magnesite in the combustion zone of the furnace. The setting of the necessary firing conditions, in particular the temperature range, is determined kinetically, ie by determining the dissolution rate of a sample of the spent material in acid, which must be as high as possible. The fired material discharged from the kiln, which still contains about 3 to 4% by weight of bound CO 2 as a result of the gentle firing conditions, is coarsely crushed on the crusher after cooling and finely ground and sighted on a spring roller mill with a classifier. In the particle size range from 0.000 to 0.100 mm diameter, the following specific BET surface areas were measured on selected fired magnesite fractions:
kleiner als 0,100mm 20 m2/gless than 0.100mm 20m 2 / g
kleiner als 0,040mm 29m2/g.less than 0.040mm 29m 2 / g.
Nach dem Umlöseprozeß hergestellte Magnesiumoxid besitzt vergleichsweise spezifische Oberflächen um 15 bis 25m2/g. Gegebenenfalls wird Magnesiumoxid nach dem PATTINSONschen Umlöseprozeß (A) in der letzten Verfahrensstufe aus dem Silo mittels Stetigförderer kontinuierlich einer Mahlanlage zur Feinzerkleinerung zugeführt. Diesem Massestrom wird das erfindungsgemäß aufbereitete Magnesiumoxid der Feinfraktion S=0,100mm (B), ebenfalls kontinuierlich, mittels Stetigförderer zugeführt und die beiden Magnesiumoxidsorten gemeinsam vermählen.Magnesium oxide produced after the dissolving process has comparatively specific surface areas of 15 to 25 m 2 / g. Optionally, magnesium oxide is continuously fed from the silo to a grinding plant for comminution by means of a continuous conveyor after the PATTINSON process (A) in the last stage of the process. This mass flow is treated according to the invention prepared magnesium oxide of the fine fraction S = 0.100mm (B), also continuously, by means of continuous conveyor and milled the two magnesium oxide together.
Die anteilige Dosierung der beiden Mischungskomponenten erfolgt entsprechend ihrer physikalischen und chemischen Kennwerte in einem Verhältnis, das den geltenden Grenzwerten des Standards für das Erzeugnis Rechnung trägt, d. h. bis zu einem VerhältnisThe proportionate dosing of the two components of the mixture is carried out in accordance with their physical and chemical characteristics in a ratio which takes into account the applicable limit values of the standard for the product, d. H. up to a ratio
A:B = 85Ma.-%:15Ma.-%.A: B = 85Ma .-%: 15Ma .-%.
Die auf die beschriebene Weise hergestellte Magnesiumoxidmodifikation hat bei den Anwendern in Gummi-, Plast-, Porzellan-, Elektro- und Farbenindustrie den gleichen Gebrauchswert wie das Produkt, das ausschließlich im PATTINSONschen Umlöseprozeß entstanden ist.The magnesium oxide modification produced in the manner described has the same utility value among users in the rubber, plastic, porcelain, electrical and paint industries as the product which was produced exclusively in the PATTINSON dissolving process.
Claims (1)
betragenfor rotary kiln throughput 10 to 30mm
be
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD22493680A DD154096B1 (en) | 1980-11-04 | 1980-11-04 | PROCESS FOR PREPARING ACTIVE TECHNICAL MAGNESIUM OXIDE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD22493680A DD154096B1 (en) | 1980-11-04 | 1980-11-04 | PROCESS FOR PREPARING ACTIVE TECHNICAL MAGNESIUM OXIDE |
Publications (2)
Publication Number | Publication Date |
---|---|
DD154096A1 DD154096A1 (en) | 1982-02-24 |
DD154096B1 true DD154096B1 (en) | 1987-04-08 |
Family
ID=5527033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DD22493680A DD154096B1 (en) | 1980-11-04 | 1980-11-04 | PROCESS FOR PREPARING ACTIVE TECHNICAL MAGNESIUM OXIDE |
Country Status (1)
Country | Link |
---|---|
DD (1) | DD154096B1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1076400C (en) * | 1998-03-06 | 2001-12-19 | 杨兆祥 | Boron-magnesium compound additives and preparing method thereof |
-
1980
- 1980-11-04 DD DD22493680A patent/DD154096B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DD154096A1 (en) | 1982-02-24 |
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ENJ | Ceased due to non-payment of renewal fee |