US3669889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Granular ceramic heat carrier and method for manufacture thereof
Assignee: Individual
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Filing: 1968-12-20
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Granted: 1972-06-13
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Expires: 1988-12-20
Abstract
Abstract A granular ceramic heat carrier for use in conjunction with chemical processes, the granules of which heat carrier contain the oxides of aluminum, silicon, chromium and iron, and a method of manufacturing said granular ceramic heat carrier comprising preparing a mix from alumina, fire clay and chrome are powders and a binder.
Inventors
- 👤 Diomid Ilich Juzvuk
- 👤 Valentin Vasilievich Saparov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:18
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/0009; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/862; C; C04; C04B; C04B35/00; C04B35/01; C04B35/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
146 words
A method for the manufacture of a granular ceramic heat carrier which comprises the steps of (1) preparing a dry mix from 65-75 percent powdered alumina, 10-15 percent fire clay, and 15-20 percent chrome ore based on the overall weight of the dry mix, (2) moistening the dry mix with a first portion of a binder selected from the group consisting of aqueous aluminum sulfate, cellulose sulfite liquor and an alkali metal silicate selected from sodium silicate, potassium silicate and mixtures of the two, said first portion of said binder having a specific gravity of 1.20-1.35 (3) granulating said moistened mix while moistening with a second portion of said binder having a specific gravity of 1.12-1.19 and (4) subjecting the resultant granules to firing by heating to a temperature of 1,500*1,650* C. over a period of 24-36 hours and holding at that temperature for 6-10 hours.
Claim 2
Dependent Claim
14 words
A method according to claim 2, wherein the binder is a sodium silicate solution.
Claim 3
Dependent Claim
14 words
A method according to claim 2, wherein the binder is a potassium silicate solution.
Claim 4
Dependent Claim
18 words
A method according to claim 2, wherein the binder is a mixture of sodium and potassium silicate solutions.
Claim 5
Dependent Claim
46 words
A method according to claim 2, wherein about one-third of the dry mix is moistened with an aluminum sulfate solution and subjected to granulation while feeding simultaneously to the granulator the remaining two-thirds of the dry mix and the moistening the resultant granules with sulfite-cellulose liquor.
Claim 6
Dependent Claim
31 words
A method as in claim 6 wherein the aluminum sulfate solution has a specific gravity of 1.20 to 1.22g/cm3 and the sulfite-cellulose liquor has a specific gravity of 1.12 to 1.19g/cm3.
Claim 7
Dependent Claim
18 words
A method as in claim 7 wherein the firing is carried out at 1,650* C. for 8 hours.
Claim 8
Dependent Claim
78 words
A method as in claim 2 wherein step (2) comprises moistening one-third of the dry mix with a first alkali metal silicate solution binder having a specific gravity of 1.30 to 1.35 g/cm3 to obtain a moisture content of 8 to 10 wt. percent, granulating the resultant mix, spraying the granules with a second alkali metal silicate solution binder having a specific gravity of 1.12 to 1.19 g/cm3 while simultaneously adding the remaining two-thirds of the dry mix.
Claim 9
Dependent Claim
17 words
A method as in claim 9 wherein the firing is carried out at 1,500*C. for 8 hours.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |