US3680698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the treatment of slimes and waste solids
Assignee: Occidental Petroleum Corp
•
Filing: 1970-02-25
•
Granted: 1972-08-01
•
Expires: 1990-02-25
Abstract
Abstract Fine solids contained in liquids are more effectively compacted to a handleable state by the addition of a liquid coagulant reaction mass to flocculate the solids followed by settling the flocculated solids with slow agitation to compact the solids and form a clarified liquid. Additional liquid may then be extracted from the compacted solids by slowly agitating the solids while in contact with a sand filter. Alternatively, the addition of sand to the flocculated solids results in the formation of a homogeneous, highly porous aggregate which rapidly compacts, without agitation, to a high solids density.
Inventors
- 👤 Tung Liu
- 👤 David R Stern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:05
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; B; B01; B01D; B01D21/00; B01D21/01; B01D21/02; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/906; Y10S210/907
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
24 words
A process as claimed in claim 1 in which the liquid coagulant reaction mass is added to the liquid suspension with high shear agitation.
Claim 2
Dependent Claim
43 words
A process as claimed in claim 1 in which the liquid coagulant reaction mass is added to the liquid suspension in at least two flocculation stages with intermediate settling of the flocculated solids, with agitation, between additions of the liquid coagulant reaction mass.
Claim 3
Dependent Claim
34 words
A process as claimed in claim 1 in which the coagulant is added to the liquid suspension in a tOtal amount of from about 10 to about 1,000 parts per million parts particulate solids.
Claim 4
Dependent Claim
29 words
A process as claimed in claim 1 in which the water soluble polyelectrolyte coagulant contains an interpolymerized amount of at least one vinyl carboxamide sulfate which undergoes vinyl polymerization.
Claim 5
Dependent Claim
42 words
A process as claimed in claim 1 in combination with the steps of: a. passing the partially compacted solids to a porous filter media; b. further compacting the flocculated solids by slowly agitating flocculated solids in contact with the porous filter media.
Claim 6
Dependent Claim
17 words
A process as claimed in claim 6 in which the porous filter media is a sand filter.
Claim 7
Dependent Claim
57 words
A process as claimed in claim 1 in combination with the steps of: a. admixing sand with the flocculated solids when said flocculated solids are at least at a solids concentration of ten percent by weight; b. passing flocculated solids-sand mixture to a porous filter media; c. further compacting the mixture in contact with the porous filter.
Claim 8
Dependent Claim
16 words
A process as claimed in claim 8 in which the porous filter media is sand filter.
Claim 9
Dependent Claim
36 words
A process as claimed in claim 8 in which sand is admixed with flocculated solids in an amount of from about 50 to about 150 percent by weight based on the weight of the flocculated solids.
Claim 10
Dependent Claim
22 words
A process as claimed in claim 8 in combination with passing the compacted mixture of solids and sand to a settling pond.
Claim 11
Dependent Claim
17 words
A process as claimed in claim 11 in which the settling pond is a sand bottom pond.
Claim 12
Dependent Claim
18 words
A process as claimed in claim 12 in which the sand bottom pond is equipped with drainage tiles.
Claim 13
Dependent Claim
20 words
A process as claimed in claim 1 in which the partially compacted solids are centrifuged to further compact the solids.
Claim 14
Dependent Claim
54 words
A process as claimed in claim 1 in combination with the steps of: a. admixing sand with the partially compacted flocculated solids when said partially compacted solids are at least at a solids concentration of at least ten percent by weight; b. passing the mixture of sand and flocculated solids to a settling pond.
Claim 15
Dependent Claim
17 words
A process as claimed in claim 15 in which the settling pond is a sand bottom pond.
Claim 16
Dependent Claim
18 words
A process as claimed in claim 16 in which the sand bottom pond is equipped with drainage tiles.
Claim 17
Dependent Claim
33 words
A process as claimed in claim 15 in which sand is added in an amount of from about 50 to 150 percent by weight based on the weight of the compacted flocculated solids.
Claim 18
Dependent Claim
37 words
A process as claimed in claim 6 in combination with the additional steps of: a. mixing the filtered compacted solids with sand; b. passing the combined mixture of compacted filtered solids and sand to a settling pond.
Claim 19
Dependent Claim
17 words
A process as claimed in claim 19 in which the settling pond is a sand bottom pond.
Claim 20
Dependent Claim
18 words
A process as claimed in claim 20 in which the sand bottom pond is equipped with drainage tiles.
Claim 21
Dependent Claim
27 words
A process as claimed in claim 6 in which the compacted solids are scraped from the surface of the porous filter media while compacting solids are agitated.
Claim 22
Dependent Claim
14 words
A process as claimed in claim 1 in which the liquid suspension is sewage.
Claim 23
Dependent Claim
16 words
A process as claimed in claim 1 in which the liquid suspension is an industrial waste.
Claim 24
Dependent Claim
15 words
A process as claimed in claim 1 in which the liquid suspension is a slime.
Claim 25
Dependent Claim
15 words
A process as claimed in claim 25 in which the slime is a phosphate slime.
Claim 26
Dependent Claim
41 words
A process as claimed in claim 26 in which gypsum is added with the liquid coagulant reaction mass to the phosphate slime in the flocculation stage in an amount of from solution saturation to one percent in excess of solution saturation.
References Cited (Backward Citations)
US2108168A
Cited
US2381514A
Cited
GB816575A
Cited
US2947418A
Cited
US3480761A
Cited
US3320136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |