US3658509A
Expired / Lapsed
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Process for the metallothermic production of magnesium
Assignee: JULIAN M AVERY
•
Filing: 1969-02-03
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Granted: 1972-04-25
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Expires: 1989-02-03
Abstract
Abstract A method of producing magnesium by the reduction of magnesium oxide by means of a metallic reducing agent, in the presence of a molten oxidic slag, wherein the system contains an inert gas to obviate at least in part the need of a high vacuum.
Inventors
- 👤 Julian M Avery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:00
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/20; C22B26/22; C22B5/00; C22B5/02; C22B5/06; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
22 words
The metallothermic process of claim 1, wherein the inert gas is selected from the group consisting of helium, neon, argon and hydrogen.
Claim 2
Dependent Claim
28 words
The metallothermic process of claim 1, wherein the molten oxidic slag comprises 10-60 percent calcium oxide, 10-35 percent aluminum oxide, 20-50 percent silica and 5-25 percent magnesium oxide.
Claim 3
Dependent Claim
23 words
The metallothermic process of claim 1, wherein the metallic reducing agent is selected from the group consisting of aluminum, silicon and aluminum-silicon alloys.
Claim 4
Dependent Claim
20 words
The metallothermic process of claim 1, wherein the absolute pressure of the reaction-condensation system is about 1/2 to 1 atmosphere.
Claim 5
Dependent Claim
18 words
The metallothermic process of claim 1, wherein the absolute pressure of the reaction-condensation system is about 1 atmosphere.
Claim 6
Dependent Claim
20 words
The metallothermic process of claim 1, wherein the partial pressure of the inert gas is about 1/2 to 1 atmosphere.
Claim 7
Dependent Claim
112 words
A metallothermic process for the production of magnesium in a reaction-condensation system including a reducing furnace reaction zone and a condenser, which comprises charging a reducing agent, selected from the group consisting of aluminum, silicon and aluminum-silicon alloys, and an oxidant comprising magnesium oxide to the reaction zone, containing a molten oxidic slag comprising about 10-60 percent calcium oxide, 10-35 percent aluminum oxide, 20-50 percent silica and 5-25 percent magnesium oxide At a temperature of about 1400* to 1700*C., and, in an atmosphere containing an inert gas at a partial pressure of between about 1/10 and 5 atmospheres, evolving magnesium vapor from the reaction zone to the condenser and condensing the magnesium.
Claim 8
Dependent Claim
22 words
The metallothermic process of claim 8, wherein the inert gas is selected from the group consisting of helium, neon, argon and hydrogen.
Claim 9
Dependent Claim
20 words
The metallothermic process of claim 8, wherein the absolute pressure of the reaction-condensation system is about 1/2 to 1 atmosphere.
Claim 10
Dependent Claim
18 words
The metallothermic process of claim 8, wherein the absolute pressure of the reaction-condensation system is about 1 atmosphere.
Claim 11
Dependent Claim
20 words
The metallothermic process of claim 8, wherein the partial pressure of the inert gas is about 1/2 to 1 atmosphere.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |