US4384896A
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Agglomerated volatilized silica dust
Assignee: Université de Sherbrooke
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Filing: 1981-12-30
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Granted: 1983-05-24
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Expires: 2001-12-30
Abstract
Abstract There is provided a process for agglomerating volatilized silica in the form of grains by wetting same with from about 10 to about 35% by weight of an alkali or alkaline earth metal oxide solution in water, said agglomerated volatilized silica having a densification factor of 1.7 to 2.5 (when oven-dried) and a dry bulk density of from about 500 to 775 kg/m3. These agglomerated volatilized silica grains can be used to replace advantageously up to 50%, and in some cases more, by weight of Portland cement in the manufacture of concrete.
Inventors
- 👤 Pierre C. Aitcin
- 👤 Philippe Pinsonneault
- 👤 Roland Fortin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:30
CPC Classifications
C; C04; C04B; C04B18/00; C04B18/04; C04B18/14; C04B18/146; C04B18/147; C04B18/02; C04B18/021; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3009; C09C1/3036; C01; C01P; C01P2004/00; C01P2004/50; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/10; C01P2006/80; C01P2006/82; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
Agglomerated volatilized silica grains consisting essentially of agglomerated volatilized silica fumes bound by an alkali or alkaline earth metal oxide in an amount of less than 0.12% by weight, said grains having a particle size of between about 80 micrometers to about 1.25 mm, a water content of less than about 35%, said grains having a bulk density of from about 450 to about 775 kg/m 3 corresponding to a densification factor of from 1.7 to 2.5 when oven-dried.
Claim 2
Dependent Claim
79 words
Agglomerated volatilized silica grains consisting essentially of agglomerated volatilized silica fumes bound by an alkali or alkaline earth metal oxide in an amount of less than 0.12% by weight, said grains having a particle size of between about 80 micrometers to about 1.25 mm, a water content of less than about 35%, said grains having a bulk density of from about 450 to about 775 kg/m 3 corresponding to a densification factor of from 1.7 to 2.5 when oven-dried.
Claim 3
Dependent Claim
76 words
Agglomerated volatilized silica grains consisting essentially of agglomerated volatilized silica fumes bound by calcium oxide in an amount of less than 0.12% by weight, said grains having a particle size of between about 80 micrometers to about 1.25 mm, a water content of less than about 20% by weight, said grains having a bulk density of from about 450 to about 775 kg/m 3 corresponding to a densification factor of from 1.7 to 2.5 when oven-dried.
Claim 4
Dependent Claim
76 words
Agglomerated volatilized silica grains consisting essentially of agglomerated volatilized silica fumes bound by calcium oxide in an amount of less than 0.12% by weight, said grains having a particle size of between about 80 micrometers to about 1.25 mm, a water content of less than about 20% by weight, said grains having a bulk density of from about 450 to about 775 kg/m 3 corresponding to a densification factor of from 1.7 to 2.5 when oven-dried.
Claim 5
Dependent Claim
88 words
A process for agglomerating volatilized silica in the form of fine sand-like grains, which consisting essentially of mixing volatilized silica fumes with 10 to 35% by weight of a solution of an alkali oxide and recovering sand-like grains of volatilized silica having a particle size of from about 80 micrometers to about 1.25 mm, a water content of less than about 20% by weight, a bulk density of from about 460 to about 775 kg/m 3 corresponding to a densification factor of from 1.7 to 2.5 when oven-dried.
Claim 6
Dependent Claim
88 words
A process for agglomerating volatilized silica in the form of fine sand-like grains, which consisting essentially of mixing volatilized silica fumes with 10 to 35% by weight of a solution of an alkali oxide and recovering sand-like grains of volatilized silica having a particle size of from about 80 micrometers to about 1.25 mm, a water content of less than about 20% by weight, a bulk density of from about 460 to about 775 kg/m 3 corresponding to a densification factor of from 1.7 to 2.5 when oven-dried.
Claim 7
Dependent Claim
91 words
A process for agglomerating volatilized silica in the form of fine sand-like grains, which consists essentially of mixing volatilized silica fumes with 10 to 35% by weight of a supersaturated solution of an alkaline earth metal oxide and recovering sand-like grains of volatilized silica having a particle size of from about 80 micrometers to about 1.25 mm, a water content of less than about 20% by weight, a bulk density of from about 460 to about 775 kg/m 3 corresponding to a densification factor of from 1.7 to 2.5 when oven-dried.
Claim 8
Dependent Claim
91 words
A process for agglomerating volatilized silica in the form of fine sand-like grains, which consists essentially of mixing volatilized silica fumes with 10 to 35% by weight of a supersaturated solution of an alkaline earth metal oxide and recovering sand-like grains of volatilized silica having a particle size of from about 80 micrometers to about 1.25 mm, a water content of less than about 20% by weight, a bulk density of from about 460 to about 775 kg/m 3 corresponding to a densification factor of from 1.7 to 2.5 when oven-dried.
Claim 9
Dependent Claim
14 words
The process of claim 4, wherein the alkaline earth metal oxide is calcium oxide.
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) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |