US3990965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation process for the enrichment of bauxites
Assignee: Femipari Kutato Intezet
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Filing: 1974-11-26
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Granted: 1976-11-09
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Expires: 1994-11-26
Abstract
Abstract An improved process for the enrichment of bauxites with unfavorable textures and low qualities via flotation and carried out after selective agglomeration. According to the process of the invention a water-soluble prepolymer of low chain length is added to the slurry as flocculating agent, thereafter the polymerization is started again by heating the slurry and/or adjusting its pH and/or adding a catalyst thus converting the polymer chain fragments adhered onto the gangue with high surface activity into a cross-linked resin, and finally the slurry is subjected to flotation in the presence of a conventional flotation aid.
Inventors
- 👤 Zsolt Csillag
- 👤 Lajos Orban
- 👤 Karoly Solymar
- 👤 Vilmos Stefaniay
- 👤 Ivan Feher
- 👤 Miomir Ceh
- 👤 Ljiljana Jankovic
- 👤 Slavoljub Bratuljevic
- 👤 Predrag Bulatovic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:24
CPC Classifications
B; B03; B03B; B03B1/00; B03B1/04; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/016; C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/242; C22B1/244; B03D2201/00; B03D2201/002; B03D2203/00; B03D2203/02; B03D2203/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
69 words
A process for the enrichment of bauxite admixed with gangue, comprising forming from bauxite an aqueous slurry of 600 to 800 g./l. density, adding to said slurry an aminoplast or phenoplast prepolymer, then adding to said slurry quebracho, then adding to said slurry an alkylpyridinium halogenide, further polymerizing said pepolymer by heating the slurry thereby selectively to agglomerate said bauxite, and then removing gangue from the slurry by flotation.
Claim 2
Dependent Claim
69 words
A process for the enrichment of bauxite admixed with gangue, comprising forming from bauxite an aqueous slurry of 600 to 800 g./l. density, adding to said slurry an aminoplast or phenoplast prepolymer, then adding to said slurry quebracho, then adding to said slurry an alkylpyridinium halogenide, further polymerizing said pepolymer by heating the slurry thereby selectively to agglomerate said bauxite, and then removing gangue from the slurry by flotation.
Claim 3
Dependent Claim
53 words
A process as claimed in claim 1, in which said further polymerization is effected by heating the slurry at a rate of at least 3° C/min. to a temperature of 60° to 100° C and stirring the slurry for 5 to 20 minutes at a peripheral stirring speed of 0.1 to 0.5 m./sec.
References Cited (Backward Citations)
US2238662A
Cited
FR861697A
Cited
US2341046A
Cited
US2387856A
Cited
GB799873A
Cited
US3017028A
Cited
US3194758A
Cited
US3430765A
Cited
US3425548A
Cited
US3572504A
Cited
US3509021A
Cited
US3539003A
Cited
US3844412A
Cited
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 |