Patent EP1091113A2 successfully refreshed from Google Patents.
Patent US938603A successfully refreshed from Google Patents.
US4409190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extracting cobalt from spent hydroprocessing catalysts with cyanide
Assignee: Chevron USA Inc
•
Filing: 1982-09-24
•
Granted: 1983-10-11
•
Expires: 2002-09-24
Abstract
Abstract A process is disclosed for recovery of cobalt from spent catalyst particles. The particles are roasted, leached with an ammonia/ammonium salt leach solution and then leached with a cyanide ion leach solution.
Inventors
- 👤 Dean A. Van Leirsburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:02
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B23/0407; C22B23/005; C22B23/0446; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
60 words
A process to leach cobalt from spent catalysts, comprising: (a) roasting said spent catalysts at between 400° C. and 600° C.; (b) contacting said roasted catalysts with an aqueous ammonia and ammonium salt leach solution forming pregnant liquor and residual catalyst; and (c) contacting said residual catalyst with a cyanide ion containing second leach solution forming a second pregnant liquor.
Claim 2
Dependent Claim
60 words
A process to leach cobalt from spent catalysts, comprising: (a) roasting said spent catalysts at between 400° C. and 600° C.; (b) contacting said roasted catalysts with an aqueous ammonia and ammonium salt leach solution forming pregnant liquor and residual catalyst; and (c) contacting said residual catalyst with a cyanide ion containing second leach solution forming a second pregnant liquor.
Claim 3
Dependent Claim
25 words
The process of claim 1 including removing the cyanide from said second pregnant liquor and combining said first and second pregnant liquors for further processing.
Claim 4
Dependent Claim
30 words
The process of claim 1 wherein said aqueous ammonia and ammonium salt solution is at a pH of 10, and contains approximately equal molar amounts of ammonia and ammonium ion.
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) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |