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US4481031A
Expired / Lapsed
US
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Manufacture of aluminium-silicon alloys
Assignee: SKF Steel Engineering AB
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Filing: 1983-08-25
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Granted: 1984-11-06
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Expires: 2003-08-25
Abstract
Abstract In a method of manufacturing aluminium-silicon alloy from natural mineral containing alumina and silica and carbon powder, the natural mineral in powder form is injected together with a reducing agent in the form of a carbon carrier, with the aid of a carrier gas into a plasma gas produced in a plasma generator. The mineral thus heated is then introduced, together with the reducing agent and the energy-rich plasma gas, into a reaction chamber surrounded substantially on all sides by solid reducing agent in lump form. Examples of the natural mineral include andalusite, cyanite, silimite, nepheline, quartz, clay containing alumina, such as bauxite, and mixtures of two or more of these minerals.
Inventors
- 👤 Sune Eriksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:19
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/02; C22C1/026
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
84 words
A method of manutacturing an aluminium-silicon alloy from natural mineral containing alumina and silica and carbon powder, which comprises injecting (a) the natural mineral in powder form in a carrier gas and (b) a reducing agent in the form of a carbon carrier into a plasma gas produced in a plasma generator, and introducing the mineral thus heated, together with the reducing agent and the energy-rich plasma gas, into a reaction chamber surrounded substantially on all sides by solid reducing agent in lump form.
Claim 2
Independent Claim
84 words
A method of manutacturing an aluminium-silicon alloy from natural mineral containing alumina and silica and carbon powder, which comprises injecting (a) the natural mineral in powder form in a carrier gas and (b) a reducing agent in the form of a carbon carrier into a plasma gas produced in a plasma generator, and introducing the mineral thus heated, together with the reducing agent and the energy-rich plasma gas, into a reaction chamber surrounded substantially on all sides by solid reducing agent in lump form.
Claim 3
Dependent Claim
35 words
A method according to claim 1, in which the natural mineral is selected from a group consisting of andalusite, cyanite, silimite, nepheline, quartz, clay containing alumina and mixtures of two or more of these minerals.
Claim 4
Dependent Claim
13 words
A method according to claim 2 in which the natural mineral contains bauxite.
Claim 5
Dependent Claim
14 words
A method according to claim 1, in which the carbon carrier is a hydrocarbon.
Claim 6
Dependent Claim
26 words
A method according to claim 4 in which the carbon carrier is natural gas, carbon powder, charcoal powder, anthracite, petroleum coke optionally purified or coke breeze.
Claim 7
Dependent Claim
35 words
A method according to claim 1, in which the reducing agent in lump form is selected from a group consisting of coke, charcoal, petroleum coke, carbon black and mixtures of two or more of these.
Claim 8
Dependent Claim
23 words
A method according to claim 1, in which process gas recirculated from the reaction chamber is reused as plasma gas in the process.
Claim 9
Dependent Claim
17 words
A method according to claim 1, in which the natural mineral and reducing agent are injected together.
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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |