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US 4,113,466 AGranted
Concentration of hydrated aluminum oxide minerals by flotation
AssigneeReynolds Metals Company
InventorDavid Weston
Life of this patent
Estimating the term…
Abstract
A process for the concentration of hydrated aluminum oxide minerals from raw materials by flotation alone or in combination with magnetic separation using a series of conditioning steps prior to flotation involving dispersion, precipitation and flocculation.
Claims56
A process for the concentration by flotation of hydrated aluminum oxide minerals from hydrated aluminum oxide bearing raw materials comprising:
- subjecting the said raw materials to at least three stages of conditioning prior to rougher flotation, the said at least three stages of conditioning comprising:
- a wet grinding circuit in which the said grinding of the said raw materials to form a pulp is carried out in the presence of a selected dispersing agent in controlled amounts to effectively and beneficially disperse the solids contained in said pulp to produce a product to said flotation varying between about 55 to 95% minus 500 mesh;
- subsequently subjecting the said pulp to a mechanical agitation conditioning stage in which the said pulp is mechanically agitation conditioned in the presence of at least an alkaline dispersing agent at an optimum pH point within the pH range of about 7.5 to 11.5 for a sufficient period of time to precipitate deleterious salts from the said pulp and beneficially affect the surfaces of the said aluminum oxide minerals for optimization of the said flotation of the said aluminum oxide minerals;
- subsequently subjecting the said mechanically agitation conditioned pulp to a further mechanical agitation conditioning stage at an optimum pH point in the range of about 7.5 to 11.5 and in the presence of a differential activating and flocculating agent comprising one or more agents selected from the group consisting of oxyhydryl anionic collectors to activate and flocculate the said aluminum oxide minerals;
- subsequently subjecting the said conditioned pulp to flotation to produce a rougher concentrate enriched in the said aluminum oxide minerals and rougher tailings impoverished in the said aluminum oxide minerals.
2 more elements
A process for the concentration by flotation of hydrated aluminum oxide minerals from hydrated aluminum oxide bearing raw materials comprising:
- subjecting the said raw materials to at least three stages of conditioning prior to rougher flotation, the said at least three stages of conditioning comprising:
- a wet grinding circuit in which the said grinding of the said raw materials to form a pulp is carried out in the presence of an alkaline dispersing agent selected from the group consisting of sodium hydroxide, potassium hydroxide, sodium carbonate, and mixtures thereof to effectively and beneficially disperse the solids contained in the said pulp and adjust the pH of the said pulp to an optimum pH point within the pH range of about 7.5 to 11.5 to produce a product to said flotation varying between about 55% to 95% minus 500 mesh;
- subsequently subjecting the said pulp to mechanical agitation conditioning at an optimum pH point within the pH range of about 7.5 to 11.5 and for a sufficient period of time to precipitate deleterious salts from the said pulp and beneficially affect the surfaces of the said aluminum oxide minerals for optimization of the said flotation of the said aluminum oxide minerals;
- subsequently subjecting the said mechanically agitation conditioned pulp to a further stage of mechanical agitation conditioning at an optimum pH point within the range of about 7.5 to 11.5 and in the presence of at least an agent selected from the group of fatty acids to differentially activate and flocculate the said aluminum oxide minerals;
- subsequently subjecting the said conditioned pulp to flotation to produce a rougher concentrate enriched in the said aluminum oxide minerals and rougher tailings impoverished in the said aluminum oxide minerals.
2 more elements
A process for the concentration by flotation of hydrated aluminum oxide minerals from hydrated aluminum oxide bearing raw materials comprising:
- subjecting the said raw materials to at least three stages of conditioning prior to rougher flotation, the said at least three stages of conditioning comprising:
- a wet grinding circuit in which the said grinding of the said raw materials to form a pulp is carried out in the presence of an alkaline dispersing agent selected from the group consisting of sodium hydroxide, potassium hydroxide and mixtures thereof to effectively and beneficially disperse the solids contained in said pulp and adjust the pH of the said pulp to an optimum pH point within the pH range of about 9.0 to 11.5 to produce a product to said flotation varying between about 55 to 95% minus 500 mesh;
- subsequently subjecting the said pulp to mechanical agitation conditioning at an optimum pH point within the pH range of about 9.5 to 11.5 and for a sufficient period of time to precipitate deleterious salts from the said pulp and beneficially affect the surfaces of the said aluminum oxide minerals for optimization of the said flotation of the said aluminum oxide minerals;
- subsequently subjecting the said mechanically agitation conditioned pulp to a further stage of mechanical agitation conditioning at an optimum pH point within the pH range of about 9.5 to 11.5 and in the presence of an agent selected from the group of fatty acids to differentially activate and flocculate the said aluminum oxide minerals;
- subsequently subjecting the said conditioned pulp to flotation to produce a rougher concentrate enriched in the said aluminum oxide minerals and rougher tailings impoverished in the said aluminum oxide minerals.
2 more elements
A process for the concentration by flotation of hydrated aluminum oxide minerals from hydrated aluminum oxide bearing raw materials comprising:
- subjecting the said raw materials to at least three stages of conditioning comprising:
- a wet grinding circuit in which the said grinding of the said raw materials to form a pulp is carried out in the presence of sodium carbonate to effectively and beneficially disperse the solids contained in the said pulp, and adjust the pH of said pulp to an optimum pH point within the pH range of about 7.5 to 10.5 to produce a product to said flotation varying between about 55 to 95% minus 500 mesh;
- subsequently subjecting the said pulp to mechanical agitation conditioning at an optimum pH point within the pH range of about 7.5 to 10.5 and for a sufficient period of time to precipitate deleterious salts from the said pulp and beneficially affect the surfaces of the said aluminum oxide for optimization of the said flotation of the said aluminum oxide materials, subsequently subjecting the said mechanically agitation conditioned pulp to a further stage of mechanical agitation conditioning at an optimum pH point within the pH range of about 7.5 to 10.5 and in the presence of an agent selected from the group of fatty acids to differentially activate and flocculate the said aluminum oxide minerals;
- subsequently subjecting the said conditioned pulp to flotation to produce a rougher concentrate enriched in the said aluminum oxide minerals and rougher tailings impoverished in the said aluminum oxide minerals.
1 more element
A process for the concentration by flotation of hydrated aluminum oxide minerals from hydrated aluminum oxide bearing raw materials comprising:
- subjecting the said raw materials to at least three stages of conditioning prior to rougher flotation, the said at least three stages of conditioning comprising:
- a wet grinding circuit in which the said grinding of the said raw materials to form a pulp is carried out in the presence of an alkaline dispersing agent selected from the group consisting of sodium carbonate in combination with sodium hydroxide, sodium carbonate in combination with potassium hydroxide, and sodium carbonate in combination with sodium hydroxide and potassium hydroxide to effectively and beneficially disperse the solids contained in said pulp, and adjust the pH of said pulp to an optimum pH point within the pH range of about 7.5 to 10.5 to produce a product to said flotation varying between about 55 to 95% minus 500 mesh;
- subsequently subjecting the said pulp to mechanical agitation conditioning at an optimum pH point within the pH range of about 8.5 to 11.0 and for a sufficient period of time to precipitate deleterious salts from the said pulp and beneficially affect the surfaces of the said aluminum oxide minerals for optimization of the said flotation of the said aluminum oxide minerals;
- subsequently subjecting the said mechanically agitation conditioned pulp to a further stage of mechanical agitation conditioning at an optimum pH point within the pH range of about 8.5 to 11.0 and in the presence of an agent selected from the group of fatty acids to differentially activate and flocculate the said aluminum oxide minerals;
- subsequently subjecting the said conditioned pulp to flotation to produce a rougher concentrate enriched in the said aluminum oxide minerals and rougher tailings impoverished in the said aluminum oxide minerals.
2 more elements
A process for the concentration by flotation of hydrated aluminum oxide minerals from hydrated aluminum oxide bearing raw materials comprising:
- subjecting the said raw materials to at least three stages of conditioning prior to rougher flotation, the said at least three stages of conditioning comprising:
- a wet grinding circuit in which the said grinding of the said raw materials to form a pulp is carried out in the presence of a dispersing agent selected from the group consisting of lignins, phosphates, silicates, and mixtures thereof, to effectively and beneficially disperse the solids contained in the said pulp to produce a product to said flotation varying between about 55 to 95% minus 500 mesh;
- subsequently subjecting the said pulp mechanical agitation conditioning at an optimum pH point within the pH range of about 7.5 to 11.5 in the presence of an alkaline agent selected from the group consisting of sodium hydroxide, potassium hydroxide, sodium carbonate, and mixtures thereof, for a sufficient period of time to precipitate deleterious salts from the said pulp and beneficially affect the surfaces of the said aluminum oxide minerals for optimization of the said flotation of the said aluminum oxide minerals;
- subsequently subjecting the said mechanically agitation conditioned pulp to a further stage of mechanical agitation conditioning at an optimum pH point within the pH range of about 7.5 to 11.5 and in the presence of an agent selected from the group of fatty acids to differentially activate and flocculate the said aluminum oxide minerals;
- subsequently subjecting the said conditioned pulp to flotation to produce a rougher concentrate enriched in the said aluminum oxide minerals and rougher tailings impoverished in the said aluminum oxide minerals.
2 more elements
A process for the concentration by flotation of hydrated aluminum oxide minerals from hydrated aluminum oxide bearing raw materials comprising:
- subjecting the said raw materials to at least three stages of conditioning prior to rougher flotation, the said at least three stages of conditioning comprising:
- a wet grinding circuit in which the said grinding of the raw materials to form a pulp is carried out in the presence of an alkaline dispersing agent comprising sodium hydroxide and at least one dispersing agent selected from the family of lignins and wherein the pH of said pulp discharging from the said wet grinding circuit is maintained by the said sodium hydroxide within a pH range of about 9.0 to 11.0 to effectively and beneficially disperse the solids contained in the said pulp to produce a product to said flotation varying between about 55 to 95% minus 500 mesh;
- subsequently subjecting the said pulp to mechanical agitation conditioning at an optimum pH point within the pH range of about 9.5 to 11.5, such pH being maintained with sodium hydroxide and for a sufficient period of time to precipitate deleterious salts from the said pulp and beneficially affect the surfaces of the said aluminum oxide minerals for optimization of the said flotation of the said aluminum oxide materials;
- subsequently subjecting the said mechanically agitation conditioned pulp to a further stage of mechanical agitation conditioning at an optimum pH point within the range of about 10.0 to 11.5, such pH being maintained with sodium hydroxide, and in the presence of an agent selected from the group of fatty acids to differentially activate and flocculate the said aluminum oxide minerals;
- subsequently subjecting the said conditioned pulp to flotation to produce a rougher concentrate enriched in the said aluminum oxide minerals and rougher tailings impoverished in the said aluminum oxide minerals.
2 more elements
Dependencies are inferred from the claim text.