Processes for the separation of ores
AssigneeGeorgia-Pacific Chemicals LLC
InventorsMichael S. Kerns, Pablo G. Dopico, John B. Hines
Life of this patent
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Abstract
Methods for purifying one or more value materials are provided. The method can include contacting an aqueous mixture comprising a value material and a contaminant with a dispersant and a depressant to produce a treated mixture. A weight ratio of the dispersant to the depressant can be from about 1:1 to about 30:1. The method can also include recovering a purified product comprising the value material from the treated mixture. The purified product can have a reduced concentration of the contaminant relative to the aqueous slurry.
Claims20
A method for purifying a value material, comprising:
- contacting an aqueous mixture comprising a value material and a contaminant with a dispersant and a depressant to produce a treated mixture, wherein a weight ratio of the dispersant to the depressant is from about 1:1 to about 30:1, and wherein:
- the dispersant comprises silica, a silicate, a polysiloxane, a starch, a modified starch, a gum, a tannin, a lignosulphonate, carboxyl methyl cellulose, a cyanide salt, a polyacrylic acid based polymer, a naphthalene sulfonate, a benzene sulfonate, a pyrophosphate, a phosphate, a phosphonate, a tannate, a polycarboxylate polymer, a polysaccharide, dextrin, a sulfate, or any mixture thereof, and
- the depressant comprises an amine-aldehyde resin, an amine-aldehyde resin modified with a silane coupling agent, a Maillard reaction product, a mixture of one or more polysaccharides and one or more resins having azetidinium functional groups, a polysaccharide cross-linked with one or more resins having azetidinium functional groups, or any mixture thereof;
- and
- recovering a purified product comprising the value material from the treated mixture, wherein the purified product has a reduced concentration of the contaminant relative to the aqueous slurry.
A method for purifying a value material, comprising:
- combining a dispersant and a depressant with an aqueous mixture comprising a value material and a contaminant to produce a treated mixture, wherein:
- a weight ratio of the dispersant to the depressant is from about 1:1 to about 30:1,
- the dispersant comprises a silicate, and
- the depressant comprises an amine-aldehyde resin;
- and
- passing air through the treated mixture, wherein a relatively hydrophobic fraction floats to the surface and a relatively hydrophilic fraction sinks to the bottom;
- and
- recovering a purified product comprising the value material from the relatively hydrophobic fraction or the relatively hydrophilic fraction, wherein the purified product has a reduced concentration of the contaminant relative to the aqueous slurry.
A composition, comprising:
- a dispersant and a depressant, wherein:
- a weight ratio of the dispersant to the depressant is from about 1:1 to about 30:1,
- the dispersant comprises silica, a silicate, a polysiloxane, a starch, a modified starch, a gum, a tannin, a lignosulphonate, carboxyl methyl cellulose, a cyanide salt, a polyacrylic acid based polymer, a naphthalene sulfonate, a benzene sulfonate, a pyrophosphate, a phosphate, a phosphonate, a tannate, a polycarboxylate polymer, a polysaccharide, dextrin, a sulfate, or any mixture thereof, and
- the depressant comprises an amine-aldehyde resin, an amine-aldehyde resin modified with a silane coupling agent, a Maillard reaction product, a mixture of one or more polysaccharides and one or more resins having azetidinium functional groups, a polysaccharide cross-linked with one or more resins having azetidinium functional groups, or any mixture thereof.
Dependencies are inferred from the claim text.