US3907956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of agglomerating glass batch materials in a fluidized bed
Assignee: Saint Gobain Industries SA
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Filing: 1974-07-15
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Granted: 1975-09-23
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Expires: 1994-07-15
Abstract
Abstract A method and an apparatus are described whereby a product is obtained which comprises particles containing agglomerated therein granules of sand, and optionally also of other glassmaking constituents, at least partially coated with and joined together by alkali metal metasilicate. The raw granules are fluidized in a bed of gas and homogeneously treated from within the bed with an aqeuous solution of alkali metal hydroxide. The product has improved handling characteristics, having both low hygroscopicity and low friability.
Inventors
- 👤 Georges Meunier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:04
CPC Classifications
C; C03; C03B; C03B1/00; C03B1/02; C03C; C03C1/00; C03C1/02; C03C1/026
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
82 words
METHOD FOR MAKING AN AGGLOMERATED COMPOSITION FOR USE IN GLASSMAKING WHICH METHOD COMPRISES SIMULTANEOUSLY A FLUIDIZING, BY MEANS OF A GAS, A BED OF PREHEATED SAND GRANULES, B. INJECTING FROM A DISTRIBUTION HEAD LOCATED WITHIN THE FLUIDIZED BED AN AQUEOUS SOLUTION OF ALKALI METAL HYDROXIDE AND C. MECHANICALLY AGITATING THE FLUIDIZED BED AT THE LEVEL OF SAID INJECTING STEP BY MEANS OF A ROTATING RAKING DEVICE, THE REACTION TEMPERATURE OF SAID FLUIDIZED BED BEING AT LEAST 320*C AND UP TO ABOUT 400*C.
Claim 2
Dependent Claim
82 words
METHOD FOR MAKING AN AGGLOMERATED COMPOSITION FOR USE IN GLASSMAKING WHICH METHOD COMPRISES SIMULTANEOUSLY A FLUIDIZING, BY MEANS OF A GAS, A BED OF PREHEATED SAND GRANULES, B. INJECTING FROM A DISTRIBUTION HEAD LOCATED WITHIN THE FLUIDIZED BED AN AQUEOUS SOLUTION OF ALKALI METAL HYDROXIDE AND C. MECHANICALLY AGITATING THE FLUIDIZED BED AT THE LEVEL OF SAID INJECTING STEP BY MEANS OF A ROTATING RAKING DEVICE, THE REACTION TEMPERATURE OF SAID FLUIDIZED BED BEING AT LEAST 320*C AND UP TO ABOUT 400*C.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the fluidized bed is composed substantially of sand granules.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein thE fluidized bed contains also pulverized granules of other glass batch constituents.
Claim 5
Dependent Claim
17 words
The method of claim 3 wherein the glass batch constituents comprise sodium carbonate, limestone, feldspar and dolomite.
Claim 6
Dependent Claim
19 words
The method of claim 3 wherein the hot sand and said other constituents are separately introduced into the bed.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein the sand is heated to about 750*-850* C. before being introduced into the fluidized bed.
Claim 8
Dependent Claim
18 words
The method of claim 3 wherein said other constituents are heated before being introduced into the fluidized bed.
Claim 9
Dependent Claim
20 words
The method of claim 7 wherein said other constituents are heated in the hot gases rising above the fluidized bed.
Claim 10
Dependent Claim
21 words
The method of claim 1 wherein the aqueous hydroxide solution contains at least about 50 percent by weight of sodium hydroxide.
Claim 11
Dependent Claim
17 words
The method of claim 1 wherein the hydroxide solution is preheated to at least about 100* C.
Claim 12
Dependent Claim
21 words
The method of claim 1 wherein the hot gas is supplied to the fluidized bed at a temperature about 750*-850* C.
Claim 13
Dependent Claim
15 words
The method of claim 1 wherein said gas comprises hot combustion gases containing carbon dioxide.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |