US4002466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing ores
Assignee: Bethlehem Steel Corp
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Filing: 1975-11-03
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Granted: 1977-01-11
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Expires: 1995-11-03
Abstract
Abstract Iron ore and a mixture of methane and hydrogen are fed into a plasma arc torch and form a swirling film of material that slowly descends the walls of the torch. The ore is reduced in the torch, and metallic iron is collected in a crucible below the torch.
Inventors
- 👤 Donald R. MacRae
- 👤 Richard G. Gold
- 👤 William R. Sandall
- 👤 Charles D. Thompson
- 👤 Peter G. Cheplick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:37
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/001; C21B5/002; C22; C22B; C22B4/00; C22B4/005; H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/34; H05H1/3405; H05H1/3452; H05H1/3484; H05H1/3436; H05H1/3442; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/143
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
A method of reducing metal oxides in a plasma arc torch comprising a cathode and an anode having two ends, said method comprising: a. supplying a swirling vortical stabilizing gas stream adjacent to said cathode and said anode; b. introducing into said torch, between the ends of said anode, solid particles comprising said metal oxides, in a direction such that said particles combine with said gas stream to form a vortical path swirling in the same direction as said stabilizing gas stream, and establishing an arc between said cathode and said anode, said arc providing sufficient heat to convert said metal oxides into a film of material on the wall of said anode; c. reducing said metal oxides by providing a reductant in contact with them during the formation of said film and thereafter; and d. collecting the effluent from said torch in a receiving vessel.
Claim 2
Independent Claim
146 words
A method of reducing metal oxides in a plasma arc torch comprising a cathode and an anode having two ends, said method comprising: a. supplying a swirling vortical stabilizing gas stream adjacent to said cathode and said anode; b. introducing into said torch, between the ends of said anode, solid particles comprising said metal oxides, in a direction such that said particles combine with said gas stream to form a vortical path swirling in the same direction as said stabilizing gas stream, and establishing an arc between said cathode and said anode, said arc providing sufficient heat to convert said metal oxides into a film of material on the wall of said anode; c. reducing said metal oxides by providing a reductant in contact with them during the formation of said film and thereafter; and d. collecting the effluent from said torch in a receiving vessel.
Claim 3
Dependent Claim
16 words
A method as recited in claim 1, in which said solid particles include a solid reductant.
Claim 4
Dependent Claim
13 words
A method as recited in claim 2, in which said reductant is carbonaceous.
Claim 5
Dependent Claim
16 words
A method as recited in claim 1, in which said solid particles include a slag-building material.
Claim 6
Dependent Claim
21 words
A method as recited in claim 1, in which said stabilizing gas stream adjacent to said anode contains a reducing gas.
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) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |