US3929629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Materials and processes for flotation of mineral substances
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1974-02-21
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Granted: 1975-12-30
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Expires: 1994-02-21
Abstract
Abstract A froth flotation process for concentration cassiterite ore using certain polymers as gangue depressants, and the polymers themselves, are described. The polymers are water soluble acrylamide homopolymers or copolymers with acrylic or methacrylic acid or salts thereof.
Inventors
- 👤 Robert M Griffith
- 👤 Christopher Parkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:54
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/016; B03D1/014; B03D1/008; B03D1/01; B03D2201/00; B03D2201/02; B03D2201/06; B03D2203/00; B03D2203/02; B03D2203/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
69 words
A METHOD OF CONCENTRATING CASSITERITE ORE BY SUBJECTING AN AQUEOUS PULP OF THE ORE TO A FROTH FLOTATION PROCESS IN THE PRESENCE OF A COLLECTOR AND A GANGUE DEPRESSANT, IN WHICH PROCESS THE GANGUE DEPRESSANT IS A WATER SOLUBLE POLYMER CONTAINING FROM 40 TO 100 MOLE PERCENT RECURRING GROUPS A AND 0 TO 60 MOLE PERCENT RECURRING GROUPS B, THE MOLE PERCENT BEING BASED ON A+B, WHERE A REPRESENTS
Claim 2
Independent Claim
69 words
A METHOD OF CONCENTRATING CASSITERITE ORE BY SUBJECTING AN AQUEOUS PULP OF THE ORE TO A FROTH FLOTATION PROCESS IN THE PRESENCE OF A COLLECTOR AND A GANGUE DEPRESSANT, IN WHICH PROCESS THE GANGUE DEPRESSANT IS A WATER SOLUBLE POLYMER CONTAINING FROM 40 TO 100 MOLE PERCENT RECURRING GROUPS A AND 0 TO 60 MOLE PERCENT RECURRING GROUPS B, THE MOLE PERCENT BEING BASED ON A+B, WHERE A REPRESENTS
Claim 3
Dependent Claim
33 words
A method according to claim 1 in which the depressant is a copolymer of 40 to 98 mole percent A and 2 to 60 mole percent B, the percentages being based on A+B.
Claim 4
Dependent Claim
30 words
A method according to claim 2 in which the copolymer contains 70 to 95 mole percent A and 5 to 30 mole percent B, the percentages being based on A+B.
Claim 5
Dependent Claim
18 words
A method according to claim 1 in which the copolymer consists of groups A or A and B.
Claim 6
Dependent Claim
46 words
A method according to claim 1 in which the molecular weight of the polymer is such that an aqueous solution containing 10 percent by weight of the polymer has at pH 7 and a temperature of 25*C a Brookfield viscosity of from 15 to 5,000 centipoise.
Claim 7
Dependent Claim
11 words
A method according to claim 1 in which R represents hydrogen.
Claim 8
Dependent Claim
21 words
A method according to claim 1 in which the collector is an aryl arsonic acid, aryl phosphonic acid or alkyl succinamate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |