US3919080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrite depression in coal flotation by the addition of sodium sulfite
Assignee: Consolidation Coal Co
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Filing: 1972-09-14
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Granted: 1975-11-11
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Expires: 1992-09-14
Abstract
Abstract Pyritic sulfur flotation is depressed in aqueous flotation of a fine particle size coal fraction by adding sulfite to the flotation pulp.
Inventors
- 👤 John C Stauter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:37
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/06; B03D1/001; B03D1/002; B03D1/004; B03D1/006; B03D1/008; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
A FORTH FLOTATION PROCESS FOR REDUCING SULFUR CONCENTRATION OF A COAL CONTAINING PYRITE COMPRISING MIXING IN A FLOTATION CELL A FINE PARTICLE SIZE FRACTION OF SAID COAL WITH AN AQUE OUS A MEDIA AND A FLOTATON GAS IN THE PRESENCE OF A SOLUBLE SALT OF A METAL CATION AND AN ANION CAPABLE OF FORMING SULFITE IN AN ACUEOUS MEDIA WHEREBY THE FINE COAL PARTICLES ARE REMOVED FROM THE CELL IN FRTOTH AND PYRITE FLOTATION IS DEPRESSED WITH A SUBSTANTIAL PORTION OF THE PYRITE BEING REMOVED FROM THE CELL
Claim 2
Dependent Claim
88 words
A FORTH FLOTATION PROCESS FOR REDUCING SULFUR CONCENTRATION OF A COAL CONTAINING PYRITE COMPRISING MIXING IN A FLOTATION CELL A FINE PARTICLE SIZE FRACTION OF SAID COAL WITH AN AQUE OUS A MEDIA AND A FLOTATON GAS IN THE PRESENCE OF A SOLUBLE SALT OF A METAL CATION AND AN ANION CAPABLE OF FORMING SULFITE IN AN ACUEOUS MEDIA WHEREBY THE FINE COAL PARTICLES ARE REMOVED FROM THE CELL IN FRTOTH AND PYRITE FLOTATION IS DEPRESSED WITH A SUBSTANTIAL PORTION OF THE PYRITE BEING REMOVED FROM THE CELL
Claim 3
Dependent Claim
18 words
A process of claim 1 in which the metal is an alkali metal or an alkaline earth metal.
Claim 4
Dependent Claim
49 words
A process of claim 1 wherein the soluble salt is added to the aqueous media in the ratio of about 0.1-1.0 lb/ton of coal and the soluble salt is capable of forming in an aqueous media an alkali metal or an alkaline earth metal cation and a sulphite anion.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |