Patent US4210531A successfully refreshed from Google Patents.
US4210531A
Expired / Lapsed
US
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Process for dewatering mineral concentrates
Assignee: Wyeth Holdings LLC
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Filing: 1977-12-15
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Granted: 1980-07-01
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Expires: 1997-12-15
Abstract
Abstract Treatment of a slurry of a mineral concentrate with a flocculant followed by a combination of an anionic surfactant and a water-insoluble organic liquid provides reduced moisture content upon dewatering the thus-treated slurry.
Inventors
- 👤 Samuel S. Wang
- 👤 Morris E. Lewellyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:15
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/002; C02F1/00; C02F1/52; C02F1/54
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
A process for dewatering mineral concentrates which consists essentially of first mixing with an aqueous slurry of said mineral concentrate an effective amount of a polyacrylamide flocculant; next mixing with the flocculant-treated slurry an effective amount of a combination of an anionic surface active agent composition and a water-insoluble organic liquid selected from aliphatic hydrocarbons, aromatic hydrocarbons, aliphatic alcohols, aromatic alcohols, aliphatic halides, aromatic halides, vegetable oils, and animal oils, said combination comprising from about 5 to about 95 weight percent of anionic surface active agent and, corresponsingly, from about 95 to about 5 weight percent of water-insoluble organic liquid, based on the total weight of surface active agent and organic liquid, said water-insoluble organic liquid being different from any water-insoluble organic liquid present in said anionic surface active agent composition; and thereafter removing water as a liquid from said slurry.
Claim 2
Dependent Claim
141 words
A process for dewatering mineral concentrates which consists essentially of first mixing with an aqueous slurry of said mineral concentrate an effective amount of a polyacrylamide flocculant; next mixing with the flocculant-treated slurry an effective amount of a combination of an anionic surface active agent composition and a water-insoluble organic liquid selected from aliphatic hydrocarbons, aromatic hydrocarbons, aliphatic alcohols, aromatic alcohols, aliphatic halides, aromatic halides, vegetable oils, and animal oils, said combination comprising from about 5 to about 95 weight percent of anionic surface active agent and, corresponsingly, from about 95 to about 5 weight percent of water-insoluble organic liquid, based on the total weight of surface active agent and organic liquid, said water-insoluble organic liquid being different from any water-insoluble organic liquid present in said anionic surface active agent composition; and thereafter removing water as a liquid from said slurry.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said flocculant is a nonionic polyacrylamide.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein said anionic surface active agent composition consists of sodium bis(2-ethylhexyl)sulfosuccinate.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein said water-insoluble organic liquid is a fuel oil.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein said mineral concentrate is fine coal.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein said mineral concentrate is fine coal and said flocculant is a nonionic polyacrylamide.
Claim 8
Dependent Claim
26 words
The process of claim 1 wherein said mineral concentrate is fine coal, said flocculant is a nonionic polyacrylamide and said surface active agent is sodium bis(2-ethylhexyl)sulfosuccinate.
Claim 9
Dependent Claim
34 words
The process of claim 1 wherein said mineral concentrate is fine coal, said flocculant is a nonionic polyacrylamide, said surface active agent is sodium bis(2-ethylhexyl)sulfosuccinate, and said water-insoluble organic liquid is a fuel oil.
Claim 10
Dependent Claim
34 words
The process of claim 1 wherein said mineral concentrate is fine coal, said flocculant is a nonionic polyacrylamide, said surface active agent is sodium bis(2-ethylhexyl)sulfosuccinate, and said water-insoluble organic liquid is a vegetable oil.
Claim 11
Dependent Claim
12 words
The process of claim 9 wherein said vegetable oil is corn oil.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-01 | 1983-12-31 | 1984-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-01 | 1987-12-31 | 1988-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-01 | 1991-12-31 | 1992-07-01 | $7700.00 | Window Closed / Lapsed |