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Patent US4006013A successfully refreshed from Google Patents.
US4006013A
Expired / Lapsed
US
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Process for fining carbonaceous alloys of iron, nickel and/or cobalt
Assignee: Outokumpu Oyj
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Filing: 1975-04-29
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Granted: 1977-02-01
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Expires: 1995-04-29
Abstract
Abstract In a process for purifying carboniferous iron, nickel and/or cobalt alloys in which the base metal tends to form a carbide, a mixture of at least one halogen and hydrogen is added to the metal melt in order to remove in the form of halides the metals present as impurities.
Inventors
- 👤 Simo Antero Iivari Makipirtti
- 👤 John Henrik Relander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:06
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/02; C22B23/023
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
90 words
An improved process for refining an impure alloy containing a base metal and at least one of the metals iron, cobalt and nickel, in which the base metal tends to form a carbide, wherein a mixture of at least one halogen-containing material and hydrogen is added to a smelt of the alloy in which smelt the carbon content is between 4% and 8% in order to lower activity of the base metal, forming metal halides of impurities and withdrawing impurities in the form of their metal halides from the smelt.
Claim 2
Dependent Claim
90 words
An improved process for refining an impure alloy containing a base metal and at least one of the metals iron, cobalt and nickel, in which the base metal tends to form a carbide, wherein a mixture of at least one halogen-containing material and hydrogen is added to a smelt of the alloy in which smelt the carbon content is between 4% and 8% in order to lower activity of the base metal, forming metal halides of impurities and withdrawing impurities in the form of their metal halides from the smelt.
Claim 3
Dependent Claim
33 words
The process of claim 1 wherein said halogen containing material comprises at least one substance of the formula X 2 , HX or NH 4 X in which X represents a halogen atom.
Claim 4
Dependent Claim
78 words
A process for refining a carbonaceous alloy containing as its base metal one or more of the metals Cr, Mo, W, Nb and Ta; about 4% to about 8% C; less than about 4% impurities; the remainder being one or more of the metals iron, cobalt or nickel, which process comprises contacting said alloy as a smelt with a mixture of hydrogen and at least one halogen compound to form metal halides and withdrawing impurities as metal halides.
Claim 5
Dependent Claim
78 words
A process for refining a carbonaceous alloy containing as its base metal one or more of the metals Cr, Mo, W, Nb and Ta; about 4% to about 8% C; less than about 4% impurities; the remainder being one or more of the metals iron, cobalt or nickel, which process comprises contacting said alloy as a smelt with a mixture of hydrogen and at least one halogen compound to form metal halides and withdrawing impurities as metal halides.
Claim 6
Dependent Claim
30 words
The process of claim 3 wherein said mixture contacting said alloy smelt is 0.7 to 4.5% H 2 and at least one hydrohalide, calculated on the weight of smelt feed.
Claim 7
Dependent Claim
33 words
The process of claim 3 comprising contacting the alloy smelt with a mixture of H 2 and at least one hydrohalide over a period of from about 30 minutes to about 45 minutes.
Claim 8
Dependent Claim
33 words
The process of claim 3 wherein said mixture contacting the alloy smelt comprises H 2 and at least one hydrohalide and wherein said alloy smelt has an initial temperature of about 1600° C.
Claim 9
Dependent Claim
32 words
The process of claim 3 wherein the alloy smelt is a smelt of ferrochromium and the mixture contacting the smelt contains H 2 and Cl 2 in a molar ratio of 1:2.
Claim 10
Dependent Claim
30 words
The process of claim 3 wherein the base metal of the alloy smelt is chromium, said smelt containing no more than about 65% Cr, and wherein said remainder being iron.
Claim 11
Dependent Claim
19 words
The process of claim 3 wherein the base metal of the alloy smelt is molybdenum said remainder being iron.
Claim 12
Dependent Claim
15 words
The process of claim 3 wherein the base metal is niobium, said remainder being iron.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-01 | 1980-08-02 | 1981-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-01 | 1984-08-02 | 1985-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-01 | 1988-08-02 | 1989-02-01 | $7700.00 | Window Closed / Lapsed |