US3928019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Froth flotation method
Assignee: BASF Catalysts LLC
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Filing: 1974-11-27
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Granted: 1975-12-23
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Expires: 1994-11-27
Abstract
Abstract A novel reagent, useful for depressing minerals during froth flotation, is obtained by mixing a solution containing complexed polyvalent metal cations, e.g., a solution containing Cu (NH3)4 2, with a solution of sodium or other alkali metal silicate to form a hydrosol.
Inventors
- 👤 Gary B Marsh
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; B03D1/002; B03D2201/00; B03D2201/06; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
109 words
IN THE FLOTATION SEPARATION OF A CALCIUM-BEARING MINERAL FROM AN ORE WHEREIN AN ORE PULP IS DISPERSED WITH A SOLUBLE ALKALI SILICATE, A POLYVALENT METAL SALT IS USED AS A DEPRESSANT FOR ONE OR MORE GANGE MINERALS, AND A CALCIUM-BEARING MINERAL IS FLOATED WITH A FATTY ACID COLLECTOR, THE IMPROVEMENT WHICH COMPRISES ADDING THE POLYVALENT METAL SALT AND THE ALKALI SILICATE TO THE PULP IN THE FORM OF A DILUTE STABLE HYDROSOL OBTAINED BY ADDING TO A SOLUTION OF POLYVALENT METAL SALT AN AGENT CAPABLE OF COMPLEXING METALLIC CATIONS IN THE SALT TO FORM STABLE COMPLEX CATIONS AND MIXING THE RESULTING SOLUTION WITH A SOLUTION OF ALKALI METAL SILICATE.
Claim 2
Dependent Claim
109 words
IN THE FLOTATION SEPARATION OF A CALCIUM-BEARING MINERAL FROM AN ORE WHEREIN AN ORE PULP IS DISPERSED WITH A SOLUBLE ALKALI SILICATE, A POLYVALENT METAL SALT IS USED AS A DEPRESSANT FOR ONE OR MORE GANGE MINERALS, AND A CALCIUM-BEARING MINERAL IS FLOATED WITH A FATTY ACID COLLECTOR, THE IMPROVEMENT WHICH COMPRISES ADDING THE POLYVALENT METAL SALT AND THE ALKALI SILICATE TO THE PULP IN THE FORM OF A DILUTE STABLE HYDROSOL OBTAINED BY ADDING TO A SOLUTION OF POLYVALENT METAL SALT AN AGENT CAPABLE OF COMPLEXING METALLIC CATIONS IN THE SALT TO FORM STABLE COMPLEX CATIONS AND MIXING THE RESULTING SOLUTION WITH A SOLUTION OF ALKALI METAL SILICATE.
Claim 3
Dependent Claim
61 words
The method of claim 1 wherein the hydrosol is formed by mixing an aqueous solution containing polyvalent cations with an aqueous solution of a material selected from the group consisting of ammonia, alkali metal salt of polyphosphoric acid, alkali metal salt of polycarboxylic acid, alkali metal salt of lower alkyl-substituted amino acetic acid and alkali metal salt of hydroxy amino acid.
Claim 4
Dependent Claim
24 words
The method of claim 2 wherein the hydrosol is formed by mixing a solution containing Cu(NH3)4 2 cations with a solution of sodium silicate.
Claim 5
Dependent Claim
32 words
The method of claim 1 wherein the ore is a fluorspar ore containing calcite and apatite in the gangue and fluorite is floated while calcite and apatite are depressed by said hydrosol.
Claim 6
Dependent Claim
32 words
The method of claim 3 wherein the ore is a fluorspar ore containing calcite and apatite in the gangue and fluorite is floated while calcite and apatite are depressed by said hydrosol.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |