US4118450A
Expired / Lapsed
US
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Method for producing inorganic porous shaped material
Assignee: SK Kaken Co Ltd
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Filing: 1976-10-27
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Granted: 1978-10-03
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Expires: 1996-10-27
Abstract
Abstract A method for producing an inorganic porous shaped product comprising the steps of mixing silica dust with water, shaping the mixture, drying the shaped product to adjust the water content thereof to 1 to 10 weight percent and thereafter firing the shaped product at a temperature of 1,000 DEG to 1,450 DEG C, said silica dust being:
Inventors
- 👤 Ryuji Nakamura
- 👤 Hideo Motogi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:37
CPC Classifications
C; C04; C04B; C04B18/00; C04B18/04; C04B18/14; C04B18/146; C04B35/00; C04B35/01; C04B35/14; C04B38/00; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
153 words
A method for producing an inorganic porous shaped product comprising the steps of mixing silica dust with water, shaping the mixture, drying the shaped product to adjust the water content thereof to 1 to 10 weight percent and thereafter firing the shaped product at a temperature of 1000° to 1450° C., said silica dust being: (i) a by-product from the process of producing ferrosilicon by electrothermal metallurgy, and (ii) 0.1 to 1.0μ in particle size, 10 to 50 m 2 /g in specific surface area and about 0.1 to about 0.3 g/cm 3 in bulk density, and comprising 85 to 98 weight percent of amorphous silica, 0.2 to 2.0 weight percent of FeO, 0.2 to 5.0 weight percent of Al 2 O 3 , 0.5 to 2.0 weight percent of MnO, 0 to 0.1 weight percent of CaO, 0.5 to 5.0 weight percent of MgO and 0.1 to 1.5 weight percent of others.
Claim 2
Independent Claim
153 words
A method for producing an inorganic porous shaped product comprising the steps of mixing silica dust with water, shaping the mixture, drying the shaped product to adjust the water content thereof to 1 to 10 weight percent and thereafter firing the shaped product at a temperature of 1000° to 1450° C., said silica dust being: (i) a by-product from the process of producing ferrosilicon by electrothermal metallurgy, and (ii) 0.1 to 1.0μ in particle size, 10 to 50 m 2 /g in specific surface area and about 0.1 to about 0.3 g/cm 3 in bulk density, and comprising 85 to 98 weight percent of amorphous silica, 0.2 to 2.0 weight percent of FeO, 0.2 to 5.0 weight percent of Al 2 O 3 , 0.5 to 2.0 weight percent of MnO, 0 to 0.1 weight percent of CaO, 0.5 to 5.0 weight percent of MgO and 0.1 to 1.5 weight percent of others.
Claim 3
Dependent Claim
32 words
The method for producing an inorganic porous shaped product according to claim 1, in which said water content of the shaped product is adjusted to 2 to 5 weight percent by drying.
Claim 4
Dependent Claim
39 words
The method for producing an inorganic porous shaped product according to claim 1, in which said silica dust is mixed with the water in combination with 0.5 to 100 weight percent of a flux, based on the silica dust.
Claim 5
Dependent Claim
40 words
The method for producing an inorganic porous shaped product according to claim 3 in which said flux is at least one species selected from the group consisting of glass powder, alkali metal salt, alkaline earth metal salt and boric acid.
Claim 6
Dependent Claim
28 words
The method for producing an inorganic porous shaped product according to claim 1, in which said firing step is conducted at a temperature of 1050° to 1400° C.
Claim 7
Independent Claim
165 words
A method for producing an inorganic porous shaped product comprising the steps of mixing silica dust with water, shaping the mixture, drying the shaped product to adjust the water content thereof to 1 to 10 weight percent, pre-firing the shaped product at a temperature of 300° to 900° C. and thereafter firing the prefired product at a temperature of 1000° to 1450° C., said silica dust being (i) a by-product from the process of producing ferrosilicon by electrothermal metallurgy, and (ii) 0.1 to 1.0μ in particle size, 10 to 50 m 2 /g in specific surface area and about 0.1 to about 0.3 g/cm 3 in bulk density, and comprising 85 to 98 weight percent of amorphous silica, 0.2 to 2.0 weight percent of FeO, 0.2 to 5.0 weight percent of Al 2 O 3 , 0.5 to 2.0 weight percent of MnO, 0 to 0.1 weight percent of CaO, 0.5 to 5.0 weight percent of MgO and 0.1 to 1.5 weight percent of others.
Claim 8
Independent Claim
165 words
A method for producing an inorganic porous shaped product comprising the steps of mixing silica dust with water, shaping the mixture, drying the shaped product to adjust the water content thereof to 1 to 10 weight percent, pre-firing the shaped product at a temperature of 300° to 900° C. and thereafter firing the prefired product at a temperature of 1000° to 1450° C., said silica dust being (i) a by-product from the process of producing ferrosilicon by electrothermal metallurgy, and (ii) 0.1 to 1.0μ in particle size, 10 to 50 m 2 /g in specific surface area and about 0.1 to about 0.3 g/cm 3 in bulk density, and comprising 85 to 98 weight percent of amorphous silica, 0.2 to 2.0 weight percent of FeO, 0.2 to 5.0 weight percent of Al 2 O 3 , 0.5 to 2.0 weight percent of MnO, 0 to 0.1 weight percent of CaO, 0.5 to 5.0 weight percent of MgO and 0.1 to 1.5 weight percent of others.
Claim 9
Dependent Claim
28 words
The method for producing an inorganic porous shaped product according to claim 6, in which said prefiring step is conducted at a temperature of 450° to 700° C.
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) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |