US3990966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation process for purifying calcite
Assignee: Thompson-Weinman and Co
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Filing: 1975-04-04
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Granted: 1976-11-09
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Expires: 1995-04-04
Abstract
Abstract Calcite is separated and purified from mineral impurities by grinding calcite ore, separating calcite from the impurities by conditioning the ground ore with a cationic flotation reagent selected from the group consisting of 1-hydroxyethyl-2-heptadecenyl glyoxalidine and 1-hydroxyethyl-2-alkylimidazolines and salt derivatives thereof, wherein the alkyl portion of the imidazoline is the alkyl portion of a fatty acid, dry or wet classifying the separated calcite and, if wet, settling the classified calcite in a thickener in the presence of an anionic settling agent.
Inventors
- 👤 Alan Stanley
- 👤 Thomas F. Deems
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:45
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/18; B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/01; B03D1/02; C01F11/185; B03D2203/00; B03D2203/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
109 words
In a wet process for purifying calcite ore containing pyrite impurities by grinding and forming a slurry of calcite ore, separating said impurities from the calcite slurry by flotation of the impurities therefrom in the presence of a flotation agent, classifying the resultant calcite slurry, settling the classified calcite in a thickener and drying the product, the improvement which comprises: using as said flotation agent a cationic surfactant selected from the group consisting of (a) 1-hydroxyethyl-2-heptadecenyl glyoxalidine, (b) 1-hydroxyethyl-2-alkylimidazolines and (c) salt derivatives of said imidazoline, wherein the alkyl portion of the imidazoline is the alkyl portion of a fatty acid of such length that said surfactant is liquid.
Claim 2
Dependent Claim
109 words
In a wet process for purifying calcite ore containing pyrite impurities by grinding and forming a slurry of calcite ore, separating said impurities from the calcite slurry by flotation of the impurities therefrom in the presence of a flotation agent, classifying the resultant calcite slurry, settling the classified calcite in a thickener and drying the product, the improvement which comprises: using as said flotation agent a cationic surfactant selected from the group consisting of (a) 1-hydroxyethyl-2-heptadecenyl glyoxalidine, (b) 1-hydroxyethyl-2-alkylimidazolines and (c) salt derivatives of said imidazoline, wherein the alkyl portion of the imidazoline is the alkyl portion of a fatty acid of such length that said surfactant is liquid.
Claim 3
Dependent Claim
25 words
The process of claim 1, wherein said cationic surfactant is combined with calcite in amounts of 0.1 to 0.5 lbs per ton of calcite ore.
Claim 4
Dependent Claim
12 words
The process of claim 1, wherein said cationic surfactant is 1-hydroxyethyl-2-heptadecenyl glyoxalidine.
Claim 5
Dependent Claim
21 words
The process of claim 1, wherein said settling agent is used in amounts of 0.015 lbs per ton of calcite ore.
Claim 6
Dependent Claim
19 words
The process of claim 1, wherein said alkyl portion is the alkyl portion of oleic acid or tall oil.
Claim 7
Dependent Claim
23 words
The process of claim 1 in which said classified calcite is settled in said thickener in the presence of an anionic salt surfactant.
Claim 8
Dependent Claim
20 words
The process of claim 6 in which said anionic surfactant is added to said process only subsequently to said flotation.
Claim 9
Dependent Claim
103 words
In a dry process for purifying calcite ore containing pyrite impurities by grinding and forming a slurry of calcite ore, separating impurities from the calcite slurry by flotation of the impurities therefrom in the presence of a flotation agent, drying the slurry and dry grinding and classifying the resultant calcite, the improvement which comprises: using as said flotation agent a cationic surfactant selected from the group consisting of (a) 1-hydroxyethyl-2-heptadecenyl glyoxalidine, (b) 1-hydroxyethyl-2-alkylimidazolines and (c) salt derivatives of said imidazoline, wherein the alkyl portion of the imidazoline is the alkyl portion of a fatty acid of such length that said surfactant is liquid.
Claim 10
Dependent Claim
103 words
In a dry process for purifying calcite ore containing pyrite impurities by grinding and forming a slurry of calcite ore, separating impurities from the calcite slurry by flotation of the impurities therefrom in the presence of a flotation agent, drying the slurry and dry grinding and classifying the resultant calcite, the improvement which comprises: using as said flotation agent a cationic surfactant selected from the group consisting of (a) 1-hydroxyethyl-2-heptadecenyl glyoxalidine, (b) 1-hydroxyethyl-2-alkylimidazolines and (c) salt derivatives of said imidazoline, wherein the alkyl portion of the imidazoline is the alkyl portion of a fatty acid of such length that said surfactant is liquid.
Claim 11
Dependent Claim
19 words
The process of claim 8, wherein said alkyl portion is the alkyl portion of oleic acid or tall oil.
Claim 12
Dependent Claim
12 words
The process of claim 8, wherein said cationic surfactant is 1-hydroxyethyl-2-heptadecenyl glyoxalidine.
Claim 13
Dependent Claim
25 words
The process of claim 10, wherein said cationic surfactant is combined with calcite in amounts of 0.1 to 0.5 lbs. per ton of calcite ore.
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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) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |