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Patent US4140597A successfully refreshed from Google Patents.
US4140597A
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Method of recovering the component metals from sintered metal carbides
Assignee: TOHO KINZOLI CO Ltd
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Filing: 1977-10-27
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Granted: 1979-02-20
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Expires: 1997-10-27
Abstract
Abstract The disclosure is of a simple and economical method for recovering the component metals from a sintered metal carbide. The sintered metal carbide is employed as an anode and treated by electrolysis in an acid solution. The metal carbide e.g. WC dissolves and precipitates as a metal hydroxide. At the same time the metal e.g. Co, which is a sintering binder, is electro-deposited on the surface of a cathode. The metal hydroxide may be washed, calcined and reduced in hydrogen gas to obtain a pure metal powder.
Inventors
- 👤 Yoshitaka Kobayakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:33
CPC Classifications
C; C25; C25C; C25C1/00; C25C1/06; C25C1/08; C25F; C25F3/00; C25F3/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
A method of recovering the component metals from a sintered metal carbide, said sintered metal carbide comprising a metal carbide in a matrix of a binding metal, which comprises; subjecting the sintered metal carbide to electrolysis in an acid solution, using as the anode in the acid solution, the sintered metal carbide, whereby the metal carbide is dissolved and converted to a metal hydroxide which precipitates from the acid solution, and the binding metal is electro-deposited on the surface of the cathode; and subsequently reducing the metal hydroxide to obtain the corresponding metal.
Claim 2
Independent Claim
93 words
A method of recovering the component metals from a sintered metal carbide, said sintered metal carbide comprising a metal carbide in a matrix of a binding metal, which comprises; subjecting the sintered metal carbide to electrolysis in an acid solution, using as the anode in the acid solution, the sintered metal carbide, whereby the metal carbide is dissolved and converted to a metal hydroxide which precipitates from the acid solution, and the binding metal is electro-deposited on the surface of the cathode; and subsequently reducing the metal hydroxide to obtain the corresponding metal.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the metal hydroxide is washed and calcined before reduction.
Claim 4
Dependent Claim
10 words
The method of claim 2 wherein reducing is with hydrogen.
Claim 5
Dependent Claim
24 words
The method of claim 1 wherein the sintered metal carbide is tungsten carbide with a cobalt binder and the metal hydroxide is tungstic acid.
Claim 6
Dependent Claim
15 words
The method of claim 4 wherein the acid solution is a solution of nitric acid.
References Cited (Backward Citations)
US3959096A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |