US4075311A
Expired / Lapsed
US
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Process for preparing granulated magnesium hydroxide and magnesia of a large specific surface
Assignee: Veitscher Magnesitwerke AG
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Filing: 1976-01-28
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Granted: 1978-02-21
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Expires: 1996-01-28
Abstract
Abstract Granulated magnesium hydroxide is prepared by agglomerating finely divided magnesia with water as a binding agent to produce granules, the water serving to hydrate the magnesia. The magnesium hydroxide may be thermally decomposed to obtain magnesia of a large specific surface, such as microporous magnesia.
Inventors
- 👤 Peter Eustacchio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:21
CPC Classifications
C; C01; C01F; C01F5/00; C01F5/14; C01F5/16; C01P; C01P2004/00; C01P2004/50; C01P2004/60; C01P2004/61
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
64 words
A process for preparing insulation magnesium hydroxide, comprising the steps of adding to a mass of finely divided magnesia an amount of water sufficient to act as a binding agent for the finely divided magnesia granulating the mass to form granules and subjecting the granules to an exothermic hydration reaction for hydrating at least 50%, by weight, of the magnesia with the added water.
Claim 2
Dependent Claim
64 words
A process for preparing insulation magnesium hydroxide, comprising the steps of adding to a mass of finely divided magnesia an amount of water sufficient to act as a binding agent for the finely divided magnesia granulating the mass to form granules and subjecting the granules to an exothermic hydration reaction for hydrating at least 50%, by weight, of the magnesia with the added water.
Claim 3
Dependent Claim
24 words
The process of claim 1, comprising the steps of thermally decomposing the autogenously dried magnesium hydroxide to obtain magnesia of a large specific surface.
Claim 4
Dependent Claim
21 words
The process of claim 2, further comprising the step of subjecting the magnesia mass to heat to initiate the hydration reaction.
Claim 5
Dependent Claim
19 words
The process of claim 3, wherein the magnesia mass is subjected to heat in the form of warm water.
Claim 6
Dependent Claim
26 words
The process of claim 4, wherein the magnesia is granulated in a granulating device and the granules are subjected to heat by heating the granulating device.
Claim 7
Dependent Claim
25 words
The process of claim 4, wherein the granules are conducted through a conveying path and the granules are subjected to heat in the conveying path.
Claim 8
Dependent Claim
22 words
The process of claim 4, wherein the granules are subjected to heat by introducing a heated rod into the mass of granules.
Claim 9
Dependent Claim
25 words
The process of claim 4, wherein the hydration reaction is permitted to proceed without further subjecting it to heat after the reaction has been initiated.
Claim 10
Dependent Claim
28 words
The process of claim 2, wherein the finely divided magnesia is granulated to produce granules having a size at least ten times that of the finely divided magnesia.
Claim 11
Dependent Claim
18 words
The process of claim 9, wherein the granules have a size between about 0.1 mm and 50 mm.
Claim 12
Dependent Claim
36 words
The process of claim 2, further comprising the step of adding to the finely divided magnesia which is provided for producing granules concentrated at one site a small amount of magnesia of a large specific surface.
Claim 13
Dependent Claim
23 words
The process of claim 2, comprising the further step of grinding the magnesia of a large specific surface yield from said magnesium hydroxide.
Claim 14
Dependent Claim
30 words
The process of claim 2, wherein an amount of water is added to the finely divided magnesia sufficent for the granulating thereof but insufficient to hydrate all of the magnesia.
Claim 15
Dependent Claim
26 words
The process of claim 2, wherein about 0.5 to 1 part by weight of water is added per part by weight of the finely divided magnesia.
Claim 16
Dependent Claim
19 words
The process of claim 2, wherein the finely divided magnesia is a product calcined at temperatures below 1200° C.
Claim 17
Dependent Claim
22 words
The process of claim 2, wherein the finely divided magnesia is a product having a particle size of less than 500 microns.
Claim 18
Dependent Claim
22 words
The process of claim 2, wherein the magnesium hydroxide is thermally decomposed at a temperature between about 300° C and 500° C.
Claim 19
Dependent Claim
22 words
The process of claim 1, further comprising the step of subjecting the magnesia mass to heat to initiate the exothermic hydration reaction.
Claim 20
Dependent Claim
35 words
The process of claim 18, further comprising the step of adding to the finely divided magnesia concentrated at one site a small amount of magnesia of a large specific surface to initiate the hydration reaction.
Claim 21
Dependent Claim
14 words
The process of claim 19, wherein the magnesia of large specific surface is microporous.
Claim 22
Dependent Claim
25 words
The process of claim 18, wherein the granules are conducted through a conveying path and the granules are subjected to heat in the conveying path.
Claim 23
Dependent Claim
22 words
The process of claim 18, wherein the granules are subjected to heat by introducing a heated rod into the mass of granules.
Claim 24
Dependent Claim
14 words
The process of claim 18, wherein the granules are subjected to heat during granulating.
Claim 25
Dependent Claim
14 words
The process of claim 18, wherein the granules are subjected to heat after granulating.
Claim 26
Dependent Claim
26 words
The process of claim 18, wherein the exothermic hydration reaction is permitted to proceed without further subjecting it to heat after the reaction has been initiated.
Claim 27
Dependent Claim
18 words
The process of claim 18, wherein the granules are subjected to heat in the form of warm water.
Claim 28
Dependent Claim
27 words
The process of claim 18, wherein the magnesia is granulated in a granulating device and the magnesia mass is subjected to heat by heating the granulating device.
Claim 29
Dependent Claim
28 words
The process of claim 1, wherein the finely divided magnesia is granulated to produce granules having a size at least ten times that of the finely divided magnesia.
Claim 30
Dependent Claim
18 words
The process of claim 28, wherein the granules have a size between about 0.1 mm and 50 mm.
Claim 31
Dependent Claim
17 words
The process of claim 1, wherein the magnesia is a product calcined at temperatures below 1200° C.
Claim 32
Dependent Claim
20 words
The process of claim 1, wherein the magnesia is a product having a particle size of less than 500 microns.
Claim 33
Dependent Claim
30 words
The process of claim 1, wherein an amount of water is added to the finely divided magnesia sufficient for the granulating thereof but insufficient to hydrate all of the magnesia.
Claim 34
Dependent Claim
26 words
The process of claim 1, wherein about 0.5 to 1 part by weight of water is added per part by weight of the finely divided magnesia.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |