US3172755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the treatment of pyrite ores
Assignee: —
•
Filing: —
•
Granted: 1965-03-09
•
Expires: 1982-03-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:33
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C22B1/10; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
THE TREATMENT OF ARSENIC-CONTAINING PYRITE ORE FOR THE RECOVERY OF SULFUR AND OF A SUBSTANTIALLY ARSENIC-FREE RESIDUE SUITABLE FOR COVERSION INTO FERROUS METAL, WHICH COMPRISES SUBJECTING SAID ARSENIC-CONTAINING PYRITE ORE IN FLUIDIZED CONDITION TO PARTIAL OXIDATION IN A STREAM OF OXYGEN-CONTAINING GAS THE OXYGEN CONTENT OF WHICH IS AT MOST EQUAL TO THE AMOUNT OF OXYGEN REQUIRED FOR OXIDATION OF THE LABILE SULFUR OF SAID ARSENIC-CONTAINING PYRITE SO AS TO OXIDIZE ONLY LABILE SULFUR THEREBY REDUCING THE TOTAL SULFUR CONTENT OF SAID PYRITE; HEATING THE THUS OBTAINED PYRITE ORE OF REDUCED SULFUR CONTENT OF FLUIDIZED CONDITION IN A STREAM OF HOT NONOXIDIZING GAS SO AS TO SEPARATE ARSENIC THEREFROM AND TO FORM A RESIDUAL ORE SUBSTANTIAL FREE OF ARSENIC; AND ROASTING THE THUS OBTAINED RESIDUAL ORE IN FLUIDIZED CONDITION IN AN OXIDIZING GAS SO AS TO OXIDIZE AT LEAST THE MAJOR PORTION OF SULFUR CONTAINED IN SAID SUBSTANTIAL ARSENIC-FREE ORE AND SIMULTANEOUSLY TO FORM AN ORE RESIDUE CONSISTING OF IRON OXIDES SUBSTANTIALLY FREE OF ARSENIC AND SUITABLE FOR DIRECT CONVERSION INTO FERROUS METAL.
Claim 2
Dependent Claim
173 words
THE TREATMENT OF ARSENIC-CONTAINING PYRITE ORE FOR THE RECOVERY OF SULFUR AND OF A SUBSTANTIALLY ARSENIC-FREE RESIDUE SUITABLE FOR COVERSION INTO FERROUS METAL, WHICH COMPRISES SUBJECTING SAID ARSENIC-CONTAINING PYRITE ORE IN FLUIDIZED CONDITION TO PARTIAL OXIDATION IN A STREAM OF OXYGEN-CONTAINING GAS THE OXYGEN CONTENT OF WHICH IS AT MOST EQUAL TO THE AMOUNT OF OXYGEN REQUIRED FOR OXIDATION OF THE LABILE SULFUR OF SAID ARSENIC-CONTAINING PYRITE SO AS TO OXIDIZE ONLY LABILE SULFUR THEREBY REDUCING THE TOTAL SULFUR CONTENT OF SAID PYRITE; HEATING THE THUS OBTAINED PYRITE ORE OF REDUCED SULFUR CONTENT OF FLUIDIZED CONDITION IN A STREAM OF HOT NONOXIDIZING GAS SO AS TO SEPARATE ARSENIC THEREFROM AND TO FORM A RESIDUAL ORE SUBSTANTIAL FREE OF ARSENIC; AND ROASTING THE THUS OBTAINED RESIDUAL ORE IN FLUIDIZED CONDITION IN AN OXIDIZING GAS SO AS TO OXIDIZE AT LEAST THE MAJOR PORTION OF SULFUR CONTAINED IN SAID SUBSTANTIAL ARSENIC-FREE ORE AND SIMULTANEOUSLY TO FORM AN ORE RESIDUE CONSISTING OF IRON OXIDES SUBSTANTIALLY FREE OF ARSENIC AND SUITABLE FOR DIRECT CONVERSION INTO FERROUS METAL.
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) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |