US3877954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous mouldings
Assignee: METASTEIN FORSCHUNGSGESELLSCHA
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Filing: 1972-05-02
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Granted: 1975-04-15
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Expires: 1992-05-02
Abstract
Abstract A method of manufacturing porous moulded bodies in which crushed crystaline silicate material is mixed with alkali silicates in the ratio of 2-6:1, the mixture containing 15 percent water by weight of dried substance. The mixture is heated in a closed vessel affording a constant volume system at 140*-500*C so as to avoid the vapour phase and produce a transformation product which is then dried, crushed and heated, if necessary with additives. There is also provided a device for heating the crushed transformation product, the device comprising a bell-type furnace with a hearth plate on which a stack of moulds is placed, an annealing bell having heating elements removably disposed over the hearth plate and a further cooling cap over the hearth plate.
Inventors
- 👤 Bernd Wustefeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:05
CPC Classifications
F; F27; F27B; F27B11/00; C; C04; C04B; C04B14/00; C04B14/02; C04B14/04; C04B20/00; C04B20/10; C04B20/1055; C04B28/00; C04B28/02; C04B28/24; C04B28/26; C04B35/00; C04B35/01; C04B35/16; C04B38/00
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
79 words
METHOD FOR THE MANUFACTURE OF POROUS MOLDED BODIES, COMPRISING THE STEPS OF HEATING A MIXTURE CONTAINING CRUSHED CRYSTALLINE SILICATE MATERIAL AND ALKALI SILICATES IN THE WEIGHT RATIO OF 2 TO 6:1, AND 15 PERCENT WATER BY WEIGHT OF DRY SUBSTANCE IN A CLOSED VESSEL AT 140* TO 500*C AVOIDING THE VAPOR PHASE TO PRODUCE A TRANSFORMATION PRODUCT, DRYING AND CRUSHING AND TRANSFORMATION PRODUCT, CHARGING THE TRANSFORMATION PRODUCT INTO A MOLD AND HEATING THE TRANSFORMATION PRODUCT AT 700* TO 900*C.
Claim 2
Dependent Claim
79 words
METHOD FOR THE MANUFACTURE OF POROUS MOLDED BODIES, COMPRISING THE STEPS OF HEATING A MIXTURE CONTAINING CRUSHED CRYSTALLINE SILICATE MATERIAL AND ALKALI SILICATES IN THE WEIGHT RATIO OF 2 TO 6:1, AND 15 PERCENT WATER BY WEIGHT OF DRY SUBSTANCE IN A CLOSED VESSEL AT 140* TO 500*C AVOIDING THE VAPOR PHASE TO PRODUCE A TRANSFORMATION PRODUCT, DRYING AND CRUSHING AND TRANSFORMATION PRODUCT, CHARGING THE TRANSFORMATION PRODUCT INTO A MOLD AND HEATING THE TRANSFORMATION PRODUCT AT 700* TO 900*C.
Claim 3
Dependent Claim
21 words
Method according to claim 1, wherein the water is introduced at least partially as water of hydration of the alkali silicates.
Claim 4
Dependent Claim
31 words
Method according to claim 1, wherein powdered mineral rich in a substance selected from the group consisting of aegirine, natural zeolites, and synthetic zeolites is used as the crystalline silicate material.
Claim 5
Dependent Claim
27 words
Method according to claim 1, wherein a compound selected from the group consisting of alkali borates, boric acid and alkali phosphates is added to the starting material.
Claim 6
Dependent Claim
31 words
Method according to claim 1, wherein one of the group consisting of vanadium and titanium compounds is added to the starting material in quantities of up to 10 percent by weight.
Claim 7
Dependent Claim
52 words
Method according to claim 1, wherein a starting material is used, in which the crystalline silicate material and alkali silicates are present in the weight ratio of 3.3:1 and the transformation takes place when the vessel contains 540 to 580g per litre volume of the vessel and at a temperature of 200*C.
Claim 8
Dependent Claim
23 words
Method according to claim 1, wherein further comprising adding a silicate material to the transformation product in the ratio of 0.02 to 6:1.
Claim 9
Dependent Claim
39 words
Method according to claim 1 wherein finely ground silicate products are mixed with the dried transformation product which silicate products are obtained by decomposing silicate material with alkali silicates in aqueous solutions and by evaporating the solutions to dryness.
Claim 10
Dependent Claim
30 words
The method according to claim 1, wherein said mixture is heated in a constant volume system under such conditions that the formation of a vapor phase during heating is avoided.
Claim 11
Dependent Claim
28 words
The method according to claim 1, wherein up to 20 percent by weight basalt dust is added to said transformation product prior to charging thereof into said mold.
Claim 12
Independent Claim
93 words
A method for manufacturing porous bodies comprising heating a mixture containing crushed crystalline silicate materials and alkali silicates in a weight ratio of 2 to 6:1, and 15 percent water by weight of dry crystalline silicate material and alkali silicates in a closed constant volume vessel at 140* to 500*C to produce a tranformation product, the amount of said mixture subjected to heating in said vessel being sufficient so that substantially no vapor phase is formed during heating, and drying, crushing and heating the transformation product so that a porous article is formed.
Claim 13
Independent Claim
93 words
A method for manufacturing porous bodies comprising heating a mixture containing crushed crystalline silicate materials and alkali silicates in a weight ratio of 2 to 6:1, and 15 percent water by weight of dry crystalline silicate material and alkali silicates in a closed constant volume vessel at 140* to 500*C to produce a tranformation product, the amount of said mixture subjected to heating in said vessel being sufficient so that substantially no vapor phase is formed during heating, and drying, crushing and heating the transformation product so that a porous article is formed.
Claim 14
Dependent Claim
56 words
The method according to claim 11, wherein the amount of said mixture in said vessel subjected to heating is sufficient so that substantially all water present in said mixture before heating is bound in said transformation product after heating so that substantially no water vapor is released when said transformation product is removed from said vessel.
Claim 15
Dependent Claim
30 words
The method according to claim 12, wherein about 540 to 580 grams of said mixture are subjected to heating in said vessel for each litre of volume of said vessel.
Claim 16
Dependent Claim
34 words
The method according to claim 11, wherein said transformation product is charged into a mold and heated in said mold to a temperature of about 700* to 900*C to produce a molded porous article.
Claim 17
Dependent Claim
20 words
The method according to claim 11, wherein said transformation product is dried to a water content of about 2.5 percent.
Claim 18
Dependent Claim
14 words
The method according to claim 15, wherein drying is accomplished in an open vessel.
Claim 19
Dependent Claim
22 words
The method according to claim 15, wherein said transformation product is crushed to a particle size of about 0.1 to 1 mm.
Claim 20
Dependent Claim
22 words
The method according to claim 11, wherein said transformation product is crushed to a particle size of about 0.1 to 1 mm.
Claim 21
Dependent Claim
23 words
The method according to claim 11, wherein said silicate material is selected from the group consisting of aegirine, natural zeolites and synthetic zeolites.
Claim 22
Dependent Claim
18 words
The method according to claim 11, wherein said mixture further includes up to 20 percent by weight basalt.
Claim 23
Dependent Claim
27 words
The method according to claim 11, wherein said crystalline silicate material is aegirine, natural zeolites, synthetic zeolites, quartzite, light ashes, blast furnace slag or ordinary building sand.
Claim 24
Dependent Claim
20 words
The method according to claim 11, wherein a portion of the water in said mixture is in chemically combined form.
Claim 25
Dependent Claim
19 words
The method according to claim 22, wherein a portion of the water in said mixture is in hydrate form.
References Cited (Backward Citations)
US3261894A
Cited
US3663249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |