Patent US2943929A successfully refreshed from Google Patents.
US2943929A
Expired / Lapsed
US
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Process for roasting sulfides
Assignee: Huntington Alloys Corp
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Filing: 1958-05-06
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Granted: 1960-07-05
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Expires: 1978-05-06
Abstract
No abstract record available.
Inventors
- 👤 Norman George Hugh Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:10
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/44; C; C22; C22B; C22B1/00; C22B1/02; C22B1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A PROCESS FOR SUSPENSION ROASTING FINELY-DIVIDED IRON SULFIDE TO OBTAIN CALCINES OF LOW SULFUR CONTENTS WHICH COMPRISES FEEDING THE FINELY-DIVIDED IRON SULFIDE HAVING A PARTICLE SIZE OF LESS THAN ABOUT 20 MESH AND CONTAINING AT LEAST 15% SULFUR INTO A FLUID-BED ROASTING OPERATION TO ESTABLISH A GAS-PERMEABLE BED OF SOLIDS, CONTROLLING THE TEMPERATURE OR SAID BED BETWEEN ABOUT 1000* F. AND ABOUT 1800* F. WHILE PASSING UPWARDLY THERETHROUGH AN OXIDIZING GAS CONTAINING FREE OXYGEN AT A VOLUME SUFFICIENT TO ROAST SAID SULFIDE AND TO FLUIDIZE SAID BED, SEPARATING FROM THE SOLIDS-CONTAINING EXHAUST GASES THE BULK OF THE SOLIDS ENTRAINED THEREIN, RETURNING THE SEPARATED SOLIDS TO THE FLUID BED IN AN AMOUNT EQUAL TO AT LEAST ABOUT 5 TIMES THE AMOUNT OF UNROASTED SULFIDE BEING FED TO SAID FLUID-BED ROASTING OPERATION, AND WITHDRAWING A CALCINE PRODUCT OF LOW SULFUR CONTENT.
Claim 2
Dependent Claim
139 words
A PROCESS FOR SUSPENSION ROASTING FINELY-DIVIDED IRON SULFIDE TO OBTAIN CALCINES OF LOW SULFUR CONTENTS WHICH COMPRISES FEEDING THE FINELY-DIVIDED IRON SULFIDE HAVING A PARTICLE SIZE OF LESS THAN ABOUT 20 MESH AND CONTAINING AT LEAST 15% SULFUR INTO A FLUID-BED ROASTING OPERATION TO ESTABLISH A GAS-PERMEABLE BED OF SOLIDS, CONTROLLING THE TEMPERATURE OR SAID BED BETWEEN ABOUT 1000* F. AND ABOUT 1800* F. WHILE PASSING UPWARDLY THERETHROUGH AN OXIDIZING GAS CONTAINING FREE OXYGEN AT A VOLUME SUFFICIENT TO ROAST SAID SULFIDE AND TO FLUIDIZE SAID BED, SEPARATING FROM THE SOLIDS-CONTAINING EXHAUST GASES THE BULK OF THE SOLIDS ENTRAINED THEREIN, RETURNING THE SEPARATED SOLIDS TO THE FLUID BED IN AN AMOUNT EQUAL TO AT LEAST ABOUT 5 TIMES THE AMOUNT OF UNROASTED SULFIDE BEING FED TO SAID FLUID-BED ROASTING OPERATION, AND WITHDRAWING A CALCINE PRODUCT OF LOW SULFUR CONTENT.
References Cited (Backward Citations)
US2650159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-05 | 1964-01-04 | 1964-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-05 | 1968-01-04 | 1968-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-05 | 1972-01-04 | 1972-07-05 | $7700.00 | Window Closed / Lapsed |