Patent US4053578A successfully refreshed from Google Patents.
US4053578A
Expired / Lapsed
US
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Process for oxidizing primarily nickel powders
Assignee: Huntington Alloys Corp
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Filing: 1975-12-10
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Granted: 1977-10-11
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Expires: 1995-12-10
Abstract
Abstract A process for producing nickel oxide and other products in which percentages of metal powder, particularly nickel powder, and water are blended, the blend being subjected to a heat treatment to form the desired product. In the case of nickel oxide, the blend is exposed to air and temperature sufficient to form an oxide shell substantially about the powder particles, this treatment being followed by a final firing heat treatment.
Inventors
- 👤 Brian Hill
- 👤 William Herbert Elwood, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:35
CPC Classifications
C; C01; C01G; C01G53/00; C01G53/04; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2666; C01P; C01P2004/00; C01P2004/60; C01P2004/61
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
A process for producing nickel oxide (NiO) which is both readily friable and of high purity which comprises forming a blend of nickel powder and water, the water content being present in an amount of about 2% and sufficient to prevent the occurrence of deleterious sintering during subsequent heat treatment with the upper level being about 20%, subjecting the blend to a preheat treatment in which the blend is exposed to air and a temperature within the range of about 700° F. to about 1350° F. such as to form an outer oxide shell substantially about the powder particle surfaces, whereby undesirable sintering during firing is greatly inhibited, the preheating temperature not exceeding that at which excessive exothermic reaction occurs, and thereafter firing the preheat treated product at a temperature of about 1500° F. to about 1850° F. to complete the oxidation process.
Claim 2
Dependent Claim
143 words
A process for producing nickel oxide (NiO) which is both readily friable and of high purity which comprises forming a blend of nickel powder and water, the water content being present in an amount of about 2% and sufficient to prevent the occurrence of deleterious sintering during subsequent heat treatment with the upper level being about 20%, subjecting the blend to a preheat treatment in which the blend is exposed to air and a temperature within the range of about 700° F. to about 1350° F. such as to form an outer oxide shell substantially about the powder particle surfaces, whereby undesirable sintering during firing is greatly inhibited, the preheating temperature not exceeding that at which excessive exothermic reaction occurs, and thereafter firing the preheat treated product at a temperature of about 1500° F. to about 1850° F. to complete the oxidation process.
Claim 3
Dependent Claim
22 words
A process in accordance with claim 1 in which the water content of the blend is from 3% to less than 18%.
Claim 4
Dependent Claim
20 words
A process in accordance with claim 1 in which the water content of the blend is from 2.5% to 8%.
Claim 5
Dependent Claim
18 words
A process in accordance with claim 1 in which the preheat treating temperature is at least 800° F.
Claim 6
Dependent Claim
17 words
A process in accordance with claim 4 in which the temperature is about 800° to 1000° F.
Claim 7
Dependent Claim
16 words
A process in accordance with claim 5 in which the temperature is 850° to 950° F.
Claim 8
Dependent Claim
23 words
A process in accordance with claim 1 in which the flow rate of air is from about 0.1 to 1 liter/min/gm of powder.
Claim 9
Dependent Claim
33 words
A process in accordance with claim 5 in which the flow rate of air is from 0.1 to 1 liter/min/gm of powder and the time of treatment is about 5 to 20 minutes.
Claim 10
Dependent Claim
42 words
A process in accordance with claim 8 in which the firing temperature is about 1600° to 1800° F. and the preheat treated product is fired for about 3/4 to 4 hours, the longer period being used at least for the lower temperature.
Claim 11
Dependent Claim
18 words
A process in accordance with claim 1 in which the firing temperature is about 1600° to 1800° F.
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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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |