US3832434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating silicon dioxide dust
Assignee: Elkem ASA
•
Filing: 1972-10-02
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Granted: 1974-08-27
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Expires: 1992-10-02
Abstract
Abstract A method of treating colloidal silicon dioxide dust is disclosed. The dust is admixed with water to form a nodulized product thereby reducing the problems normally encountered in connection with transportation and handling of silica-dust.
Inventors
- 👤 H Flood
- 👤 A Seltveit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:50
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3009; C09C1/3036; B; B01; B01J; B01J2/00; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C04; C04B; C04B35/00; C04B35/01; C04B35/14; C01P; C01P2004/00; C01P2004/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
19 words
The method of claim 1 wherein the agitation in step (d) is continued until walnut sized nodules are obtained.
Claim 2
Dependent Claim
11 words
The method of claim 1 wherein the aqueous medium is water.
Claim 3
Dependent Claim
23 words
The method of claim 1 further including the step of compressing the nodules formed in step (d) thereby increasing the weight by volume.
Claim 4
Dependent Claim
29 words
The method of claim 1 wherein the nodules of step (d) are admixed with sufficient aqueous medium and agitated to form a suspension of dust particles in aqueous medium.
Claim 5
Independent Claim
120 words
A method of treating silicon dioxide dust particles recovered from the waste gases of furnaces producing materials selected from the group consisting of metallic silicon and silicon-containing alloys comprising: a. admixing under agitation 1 part water with fRom about 2 to about 4 parts by weight of dust to form a suspension of silicon dioxide dust particles in aqueous suspension, said suspension having a liquid consistency; b. continuing the agitation and adding to the admixture a plurality of increments of from about 0.1 to about 0.3 parts of dust; c. continuing the addition of increments of dust until a thixotropic paste is formed; d. discontinuing the addition of increments of dust; and e. continuing the agitation until nodules are formed.
Claim 6
Dependent Claim
19 words
The method of claim 6 wherein the agitation in step (e) is continued until walnut sized nodules are obtained.
Claim 7
Dependent Claim
17 words
The method of claim 6 further including the step of compressing the nodules formed in step (e).
Claim 8
Dependent Claim
29 words
The method of claim 6 wherein the nodules of step (e) are admixed with sufficient aqueous medium and agitated to form a suspension of dust particles in aqueous medium.
References Cited (Backward Citations)
US3142862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |