US4207186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for dewatering mineral concentrates
Assignee: Wyeth Holdings LLC
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Filing: 1978-12-05
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Granted: 1980-06-10
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Expires: 1998-12-05
Abstract
Abstract Mineral concentrates are dewatered by filtration employing as a dewatering aid the mixture of a hydrophobic alcohol and a nonionic surfactant for significantly lower residual water contents.
Inventors
- 👤 Samuel S. Wang
- 👤 Morris E. Lewellyn
- 👤 Charles Dugan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:26
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/03; C; C02; C02F; C02F11/00; C02F11/002
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
A process for dewatering mineral and coal concentrates which comprises mixing with an aqueous slurry of the mineral concentrate an effective amount of a dewatering aid, said dewatering aid comprising, in combination: from about 1 to 99 weight percent of a hydrophobic alcohol, said hydrophobic alcohol containing a linear or branched aliphatic radical of eight to eighteen carbon atoms, inclusive; and from about 99 to 1 weight percent of a nonionic surfactant of the general structure: R--(OCH.sub.2 CH.sub.2).sub.x OH wherein x is an integer of 1 to 15 inclusive, R is a branched or linear aliphatic radical containing six to twenty-four carbon atoms, inclusive, in the alkyl moiety; and thereafter subjecting the treated slurry to filtration.
Claim 2
Dependent Claim
116 words
A process for dewatering mineral and coal concentrates which comprises mixing with an aqueous slurry of the mineral concentrate an effective amount of a dewatering aid, said dewatering aid comprising, in combination: from about 1 to 99 weight percent of a hydrophobic alcohol, said hydrophobic alcohol containing a linear or branched aliphatic radical of eight to eighteen carbon atoms, inclusive; and from about 99 to 1 weight percent of a nonionic surfactant of the general structure: R--(OCH.sub.2 CH.sub.2).sub.x OH wherein x is an integer of 1 to 15 inclusive, R is a branched or linear aliphatic radical containing six to twenty-four carbon atoms, inclusive, in the alkyl moiety; and thereafter subjecting the treated slurry to filtration.
Claim 3
Dependent Claim
31 words
The process of claim 1 wherein the dewatering aid comprises from 50 to 90 weight percent of the hydrophobic alcohol and, correspondingly, 50 to 10 weight percent of the nonionic surfactant.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein the hydrophobic alcohol has eight to twelve carbon atoms, inclusive, in the aliphatic radical.
Claim 5
Dependent Claim
27 words
The process of claim 1 wherein the hydrophobic alcohol is a decyl alcohol containing 95 weight percent of trimethyl-1-heptanol and 5 weight percent of primary decyl alcohols.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the hydrophobic alcohol is n-decyl alcohol.
Claim 7
Dependent Claim
30 words
The process of claim 1 wherein the nonionic surfactant is a polyethylene glycol ether of a linear glycol with a hydrophilic-lipophilic balance in the range of about 10.0 to 15.0.
Claim 8
Dependent Claim
26 words
The process of claim 1 wherein the nonionic surfactant is a linear primary alcohol ethoxylate containing twelve to thirteen carbon atoms, inclusive, in the alkyl moiety.
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) | 1983-06-10 | 1983-12-10 | 1984-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-10 | 1987-12-10 | 1988-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-10 | 1991-12-10 | 1992-06-10 | $7700.00 | Window Closed / Lapsed |