US4589980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Promoters for froth flotation of coal
Assignee: Zinkan Enterprises Inc
•
Filing: 1984-03-01
•
Granted: 1986-05-20
•
Expires: 2004-03-01
Abstract
Abstract Disclosed is an improved process wherein coal particles are beneficiated by froth flotation under coal froth flotation conditions to separate the desired coal particles from remaining unwanted ash and like gangue material. The improvement of the present invention comprises conducting the froth flotation in the presence of an effective proportion of a promoter which is at least C10 aliphatic carboxylic acid or an aliphatic ester thereof which is devoid of nitrogen atoms; the hydroxylated, oxidized, or alkoxylated derivative of said acid or ester promoters; and mixtures thereof.
Inventors
- 👤 Robert O. Keys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:20
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/001; B03D1/004; B03D1/0043; B03D1/006; B03D1/008; B03D1/01; B03D2201/00; B03D2201/007; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/08
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
105 words
In a froth flotation process wherein solid coal particles are selectively separated under coal froth flotation conditions as the froth phase from remaining solid feed ash particles as an aqueous phase in the presence of a coal particle collector and a frother, the improvement characterized by the addition of an effective proportion of a hydrophobic, non-ionic promoter comprising a C 10 -C 30 fatty acid; an aliphatic ester of said fatty acid wherein when said aliphatic ester is an alkoxylated derivative, said derivative is a C 3 or higher alkoxylated derivative of said fatty acid; and mixtures thereof, said promoter being devoid of nitrogen atoms.
Claim 2
Dependent Claim
105 words
In a froth flotation process wherein solid coal particles are selectively separated under coal froth flotation conditions as the froth phase from remaining solid feed ash particles as an aqueous phase in the presence of a coal particle collector and a frother, the improvement characterized by the addition of an effective proportion of a hydrophobic, non-ionic promoter comprising a C 10 -C 30 fatty acid; an aliphatic ester of said fatty acid wherein when said aliphatic ester is an alkoxylated derivative, said derivative is a C 3 or higher alkoxylated derivative of said fatty acid; and mixtures thereof, said promoter being devoid of nitrogen atoms.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein said fatty acid or the fatty acid moeity of said aliphatic ester thereof contains an additional carbon-bound hydroxyl group.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein said fatty acid contains an additional carbon-bound oxygen resulting from the oxidation thereof.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein said aliphatic ester moeity of said fatty acid contains an additional carbon-bound oxygen resulting from the oxidation thereof.
Claim 6
Dependent Claim
30 words
The process of claim 1 wherein said aliphatic ester moeity of said aliphatic ester of said fatty acid is selected from the group consisting of a monool or a polyol.
Claim 7
Dependent Claim
20 words
The process of claim 1 wherein said promoter is the C 3 or higher alkoxylated derivative of said carboxylic acid.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein said aliphatic ester promoter (a) has a C 1 -C 30 aliphatic ester group.
Claim 9
Dependent Claim
23 words
The process of claim 7 wherein said aliphatic ester promoter (a) is a C 10 -C 30 partial or full ester of glycerol.
Claim 10
Dependent Claim
12 words
The process of claim 1 wherein said collector is a fuel oil.
Claim 11
Dependent Claim
27 words
The process of claim 1 wherein said promoter is used in a dosage ranging from about 0.005 to about 2 grams of promoter per kilogram of coal.
Claim 12
Dependent Claim
51 words
The process of claim 1 wherein said coal flotation conditions include the use of a fuel oil collector in a dosage of about 0.02 to about 2.5 grams per kilogram of coal, and a lower alkanol frother in a dosage of about 0.05 to about 0.5 grams per kilogram of coal.
Claim 13
Dependent Claim
12 words
The process of claim 1 wherein said frother comprises a frothing alcohol.
Claim 14
Dependent Claim
26 words
The process of claim 12, wherein said coal particles are conditioned with said collector, with said frothing alcohol, and with said promoter prior to said float.
Claim 15
Dependent Claim
76 words
In a froth flotation process wherein solid coal particles are selectively separated under coal flotation conditions as a froth phase from remaining solid feed ash particles as an aqueous phase in the presence of a fuel oil collector and a frothing alcohol, the improvement characterized by the addition of an effective proportion of a hydrophobic, non-ionic promoter comprising a C 12 -C 22 fatty acid, a C 1 -C 30 aliphatic ester thereof, or mixtures thereof.
Claim 16
Dependent Claim
76 words
In a froth flotation process wherein solid coal particles are selectively separated under coal flotation conditions as a froth phase from remaining solid feed ash particles as an aqueous phase in the presence of a fuel oil collector and a frothing alcohol, the improvement characterized by the addition of an effective proportion of a hydrophobic, non-ionic promoter comprising a C 12 -C 22 fatty acid, a C 1 -C 30 aliphatic ester thereof, or mixtures thereof.
Claim 17
Dependent Claim
24 words
The process of claim 14 wherein said promoter is a C 1 -C 30 aliphatic ester of a C 12 -C 20 fatty acid.
Claim 18
Dependent Claim
17 words
The process of claim 14 wherein said promoter comprises an epoxidized, hydroxylated, oxidized, or propoxylated derivative thereof.
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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) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |