Patent US4477277A successfully refreshed from Google Patents.
US4477277A
Expired / Lapsed
US
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Process for producing high-purity metals
Assignee: SAMIM AZIONARIA MINERO-METALLURGICA SpA Soc
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Filing: 1983-06-21
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Granted: 1984-10-16
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Expires: 2003-06-21
Abstract
Abstract High-purity metals are obtained by reducing the respective halides with reducing metals in the vapor phase in two or three stages, said reducing metals having greater halogen affinity than that of the metals to be reduced.
Inventors
- 👤 Gianluigi D'Altilia
- 👤 Francesco Rinaldi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:39
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24; C01; C01B; C01B33/00; C01B33/02; C01B33/021; C01B33/027; C01B33/033; C22B23/00; C22B23/02; C22B23/021; C22B34/10; C22B34/12; C22B34/1263; C22B34/1268; C22B34/1272; C22B34/14; C22B34/30; C22B34/34; C22B34/36; C22B5/00; C22B5/02; C22B5/04; C22B5/12; C22B5/14; C22B5/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
177 words
A process for producing high-purity metals from their halides by reducing them with metals in the vapor phase, comprising: (a) mixing the reducing metal vapour with one or more halides of the required metal either outside or within a primary reaction zone, with possible partial reaction (b) reacting the reducing metal with the halides of the required metal in a primary reaction zone at a temperature exceeding the dew point of the reducing metal used, preferably greater than 500° C., but less than the solidification temperature of the required metal, and at atmospheric pressure or higher (c) completing the reaction of point (b) in a cyclone-shaped reaction zone under the same temperature and pressure conditions as the primary reaction zone (d) separating the required metal in the form of powder from the bottom of the cyclone-shaped reaction zone (e) recovering the reducing metal halide or halides in a cold trap which operates at a temperature exceeding the dew point of the halide or halides of the required metal, which leave without condensing and are fed to recovery.
Claim 2
Dependent Claim
177 words
A process for producing high-purity metals from their halides by reducing them with metals in the vapor phase, comprising: (a) mixing the reducing metal vapour with one or more halides of the required metal either outside or within a primary reaction zone, with possible partial reaction (b) reacting the reducing metal with the halides of the required metal in a primary reaction zone at a temperature exceeding the dew point of the reducing metal used, preferably greater than 500° C., but less than the solidification temperature of the required metal, and at atmospheric pressure or higher (c) completing the reaction of point (b) in a cyclone-shaped reaction zone under the same temperature and pressure conditions as the primary reaction zone (d) separating the required metal in the form of powder from the bottom of the cyclone-shaped reaction zone (e) recovering the reducing metal halide or halides in a cold trap which operates at a temperature exceeding the dew point of the halide or halides of the required metal, which leave without condensing and are fed to recovery.
Claim 3
Dependent Claim
26 words
A process as claimed in claim 1, wherein the high-purity metal produced from its halide is Si, Zr, Ni, Ti, W, Nb, Ta, Co or Mo.
Claim 4
Dependent Claim
15 words
A process as claimed in claim 2, wherein the reducing metal is Zn or Cd.
Claim 5
Dependent Claim
24 words
A process as claimed in claim 3, wherein powdered silicon is fed into the primary reaction or into the cyclone-shaped zone or into both.
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) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |