US4629556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of kaolin clay by froth flotation using hydroxamate collectors
Assignee: Thiele Kaolin Co
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Filing: 1984-11-29
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Granted: 1986-12-16
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Expires: 2004-11-29
Abstract
Abstract An improved flotation process for removal of colored titaniferous impurities from kaolin clay uses as collector a hydroxamate compound, or a mixture of compounds, having the formula <IMAGE> in which R is an alkyl, aryl, or alkylaryl group having 4-28, and preferably 6-24 carbon atoms, and M represents an alkali metal, an alkaline earth metal or hydrogen. The process does not require the use of activators to make the collector adsorb selectively on the colored impurities.
Inventors
- 👤 Roe-Hoan Yoon
- 👤 Thomas M. Hilderbrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:31
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/01; B03D1/002; B03D1/008; B03D1/02; B03D2201/00; B03D2201/005; B03D2201/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
95 words
In a method for removing anatase impurities from a kaolin clay wherein the impure clay in aqueous suspension is first conditioned by treatment with a collector in an amount sufficient for promoting flotation of said impurities and then subjected to froth flotation for removal of said impurities for said clay, the improvement comprising using as said collector a compound having the formula ##STR3## wherein R is an alkyl, aryl, or alkylaryl group having 4-28 carbon atoms and M is hydrogen, an alkali metal, or an alkaline earth metal, said suspension having a pH above 6.
Claim 2
Dependent Claim
95 words
In a method for removing anatase impurities from a kaolin clay wherein the impure clay in aqueous suspension is first conditioned by treatment with a collector in an amount sufficient for promoting flotation of said impurities and then subjected to froth flotation for removal of said impurities for said clay, the improvement comprising using as said collector a compound having the formula ##STR3## wherein R is an alkyl, aryl, or alkylaryl group having 4-28 carbon atoms and M is hydrogen, an alkali metal, or an alkaline earth metal, said suspension having a pH above 6.
Claim 3
Dependent Claim
13 words
A method in accordance with claim 1 wherein R has 6-24 carbon atoms.
Claim 4
Dependent Claim
15 words
A method in accordance with claim 1 wherein said suspension has a pH of 8-10.5.
Claim 5
Dependent Claim
28 words
A method in accordance with claim 1 wherein M is an alkali metal or an alkaline earth metal and R is an alkyl group having 8-18 carbon atoms.
Claim 6
Dependent Claim
22 words
A method in accordance with claim 1 wherein said froth flotation is carried out in the absence of any additional frothing agent.
Claim 7
Dependent Claim
17 words
A method in accordance with claim 1 wherein said suspension contains an effective concentration of a dispersant.
Claim 8
Dependent Claim
20 words
A method in accordance with claim 6 wherein said dispersant is selected from sodium silicate, sodium polyacrylate, and sodium polyphosphate.
Claim 9
Dependent Claim
21 words
A method in accordance with claim 1 wherein said suspension contains about 35-70% of clay solids by weight during said conditioning.
Claim 10
Dependent Claim
29 words
A method in accordance with claim 8 wherein said suspension is diluted with water to a clay solids concentration of about 15-45% by weight prior to said froth flotation.
Claim 11
Dependent Claim
21 words
A method in accordance with claim 1 wherein said suspension contains about 0.1-18 lb of said collector per ton of clay.
Claim 12
Dependent Claim
21 words
A method in accordance with claim 8 wherein said suspension contains about 0.5-6 lb of said collector per ton of clay.
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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) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |