US4185996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arsenic and sulfur elimination from cobaltiferous ores
Assignee: HR LAB Corp A DE CORP
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Filing: 1978-02-13
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Granted: 1980-01-29
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Expires: 1998-02-13
Abstract
Abstract A method for removing sulfur and arsenic from cobaltiferous ores and recovering an enriched cobalt product is described. The procedure involves the steps of (a) oxidizing said ore at a temperature of at least about 700 DEG C. to reduce the sulfur content of the ore to the desired level, (b) heating said oxidized ore with a reducing agent at a temperature of at least about 700 DEG C. to remove arsenic from the ore, and (c) recovering an enriched cobalt containing solid as the product of the process.
Inventors
- 👤 Adolfo R. Zambrano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:35
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
A method for removing sulfur and arsenic from cobaltiferous ores and recovering an enriched cobalt product comprising the steps of (a) oxidizing said ore in the presence of air at a temperature of about 700° C. to 800° C. for a period of 3 to 8 hours to reduce the sulfur content of the ore, (b) heating said oxidized ore with a reducing agent at a temperature of at least about 700° C. to remove arsenic from the ore, and (c) recovering a solid enriched in cobalt.
Claim 2
Independent Claim
87 words
A method for removing sulfur and arsenic from cobaltiferous ores and recovering an enriched cobalt product comprising the steps of (a) oxidizing said ore in the presence of air at a temperature of about 700° C. to 800° C. for a period of 3 to 8 hours to reduce the sulfur content of the ore, (b) heating said oxidized ore with a reducing agent at a temperature of at least about 700° C. to remove arsenic from the ore, and (c) recovering a solid enriched in cobalt.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein the oxidized ore is heated in step (b) at a temperature of from about 700°-800° C. for a period of from 2 to about 6 hours.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein the reducing agent comprises a small amount of a concentrate of the cobaltiferous ore.
Claim 5
Dependent Claim
23 words
The method of claim 3 wherein from about 3 to about 20% of the cobaltiferous ore concentrate is used as a reducing agent.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein the reducing agent is a reducing gas.
Claim 7
Dependent Claim
45 words
The method of claim 1 wherein the ore which is oxidized in step (a) is an ore concentrate obtained by partial roasting of the ore at a temperature of about 450° C. followed by the selective flotation of the cobaltite:sulfide concentrate from the roasted ore.
Claim 8
Dependent Claim
11 words
The method of claim 1 wherein the cobaltiferous ore is cobaltite.
Claim 9
Dependent Claim
23 words
The method of claim 1 wherein the ore is heated in step (b) at a temperature of about 700° C. to 800° C.
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) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |