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US4008151A
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Process for enrichment, by flotation, of phosphate ores with gangues containing carbonates
Assignee: Office Cherifien des Phosphates
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Filing: 1974-10-29
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Granted: 1977-02-15
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Expires: 1994-10-29
Abstract
Abstract A process for dressing phosphate ores with gangues containing carbonates, by flotation, wherein the phosphates and carbonates contained in the ore to be treated are separated by subjecting the ore to a reverse flotation treatment utilizing a combination of reagents comprising a carbonate flotation collector and agents which modify the surface physical and chemical properties of the phosphate particles and depress the latter. The process also has application to the enrichment of sedimentary and crystalline phosphate ores with gangues containing carbonates and, possibly, silicates and silico-aluminates.
Inventors
- 👤 Smael Mohammed Smani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:40
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/06; B03D1/001; B03D1/004; B03D1/008; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
158 words
The process for enrichment, by flotation, of sedimentary phosphate ores with gangues containing carbonates, comprising: first subjecting the ore to a treatment modifying the surface physical-chemical properties of the phosphated particles which the ore to be treated contains, with the aid of agents to modify said physical-chemical properties, which agents consist essentially of at least one metal salt having iron or aluminum cations and at least one complexing agent which exerts a chelating action on the phosphated particles previously conditioned by the metal salt, to form a surface complex on said particles; then, during a second stage, adding a flotation collector of the carbonates, consisting essentially of an anionic surfactant with a hydrocarbon chain containing 8 to 20 carbon atoms, which achieves flotation of the carbonate, the formation of the surface complex on the phosphated particles preventing fixation of the collecting agent on the said particles; and recovering the depressed product, essentially comprised of the sought-after phosphated concentrate.
Claim 2
Dependent Claim
158 words
The process for enrichment, by flotation, of sedimentary phosphate ores with gangues containing carbonates, comprising: first subjecting the ore to a treatment modifying the surface physical-chemical properties of the phosphated particles which the ore to be treated contains, with the aid of agents to modify said physical-chemical properties, which agents consist essentially of at least one metal salt having iron or aluminum cations and at least one complexing agent which exerts a chelating action on the phosphated particles previously conditioned by the metal salt, to form a surface complex on said particles; then, during a second stage, adding a flotation collector of the carbonates, consisting essentially of an anionic surfactant with a hydrocarbon chain containing 8 to 20 carbon atoms, which achieves flotation of the carbonate, the formation of the surface complex on the phosphated particles preventing fixation of the collecting agent on the said particles; and recovering the depressed product, essentially comprised of the sought-after phosphated concentrate.
Claim 3
Dependent Claim
25 words
Process according to claim 1, wherein the complexing agents employed are selected from the group consisting of chelating agents of tartaric acids and its salts.
Claim 4
Dependent Claim
35 words
Process according to claim 1, wherein the metal salts and the complexing agents are introduced separately and successively in the medium in which the separation of phosphates and carbonates by inverse flotation is brought about.
Claim 5
Dependent Claim
36 words
Process according to claim 1, wherein the agents modifying the surface physical-chemical properties of the phosphate particles are employed in a ratio of a quantity of at least 50 g per ton of solid material treated.
Claim 6
Dependent Claim
41 words
Process according to claim 1, wherein the metal salt or salts and the complexing agent or agents are present in the combination of agents modifying the surface physical-chemical properties of the phosphated particles in a weight ratio between 1:1 and 1:6.
Claim 7
Dependent Claim
27 words
Process according to claim 1, wherein the carbonate flotation collecting agent is employed in a ratio of 300 to 3000 g per ton of solid material treated.
Claim 8
Dependent Claim
22 words
Process according to claim 1, wherein said metal salt is selected from the group consisting of the sulphates of iron and aluminum.
Claim 9
Dependent Claim
158 words
A process for the enrichment, by flotation, of phosphate ores with gangues containing carbonates, comprising: converting the phosphate ore with carbonate containing gangue to a concentrated pulp; mixing said concentrated pulp with an amount sufficient to change the negative charge of the phosphates to positive without changing the negative charge of the carbonates of at least one metal cation selected from the group consisting of aluminum and iron cations, contacted the so-treated pulp with at least one complexing and chelating agent present in an amount sufficient to cover the phosphate particles with a strongly electronegative layer, said complexing and chelating agent comprising tartaric acid or a salt thereof; and separating the phosphates and carbonates contained in the so-treated concentrated pulp by subjecting said so-treated pulp to a reverse flotation treatment by the action of an anionic surface-active collector in an amount sufficient to accomplish said flotation, whereby flotation of the carbonate is achieved and the phosphate is recovered.
Claim 10
Dependent Claim
158 words
A process for the enrichment, by flotation, of phosphate ores with gangues containing carbonates, comprising: converting the phosphate ore with carbonate containing gangue to a concentrated pulp; mixing said concentrated pulp with an amount sufficient to change the negative charge of the phosphates to positive without changing the negative charge of the carbonates of at least one metal cation selected from the group consisting of aluminum and iron cations, contacted the so-treated pulp with at least one complexing and chelating agent present in an amount sufficient to cover the phosphate particles with a strongly electronegative layer, said complexing and chelating agent comprising tartaric acid or a salt thereof; and separating the phosphates and carbonates contained in the so-treated concentrated pulp by subjecting said so-treated pulp to a reverse flotation treatment by the action of an anionic surface-active collector in an amount sufficient to accomplish said flotation, whereby flotation of the carbonate is achieved and the phosphate is recovered.
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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) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |