Phosphate flotation using sulfo-polyesters
AssigneeEastman Kodak Company
InventorsMahendra K. Sharma, George J. O'Neill, Brij M. Moudgil
Life of this patent
Estimating the term…
Abstract
This invention relates to a process for beneficiating a silicious phosphate ore by flotation, the process comprising the steps of conditioning an aqueous slurry of phosphate ore at a pH of from 7.5 to 10.5 with a fatty acid and a fuel oil and aerating the conditioned phosphate slurry to float the phosphate, the improvement comprising conditioning the aqueous phosphate slurry prior to aeration with a water dispersible sulfo-polyester having a glass transition temperature of 28.degree. C. to 60.degree. C. and consisting essentially of repeat units from a dicarboxylic acid, a diol and a difunctional sulfomonomer.
Claims19
In a process for beneficiating a silicious phosphate ore by flotation, the process comprising the steps of conditioning an aqueous slurry of phosphate ore at a pH of from 7.5 to 10.5 with a fatty acid and a fuel oil and aerating the conditioned phosphate slurry to float the phosphate, the improvement comprising conditioning the aqueous phosphate slurry prior to aeration with a water dispersible sulfo-polyester having a glass transition temperature of 28.degree. C. to 60.degree. C., said sulfo-polyester consisting essentially of repeat units from:
- (a) a dicarboxylic acid selected from the group consisting of aromatic dicarboxylic acids, saturated aliphatic dicarboxylic acids, cycloaliphatic dicarboxylic acids, and combinations thereof;
- (b) a diol;
- and
- (c) a difunctional sulfomonomer containing at least one sulfonate group attached to an aromatic nucleus wherein the functional groups are hydroxy, carboxy or amino, provided the difunctional sulfomonomer is present in an amount from 12 to 25 mole percent based on 100 mole percent dicarboxylic acid and 100 mole percent diol.
In a process for beneficiating a silicious phosphate ore by flotation, the process comprising the steps of conditioning an aqueous slurry of phosphate ore at a pH of from 7.5 to 10.5 with a fatty acid and a fuel oil and aerating the conditioned phosphate slurry to float the phosphate, the improvement comprising conditioning the aqueous phosphate slurry prior to aeration with a water dispersible sulfo-polyester having a glass transition temperature of 50.degree. C. to 60.degree. C., said sulfo-polyester consisting essentially of repeat units from:
- (a) a dicarboxylic acid selected from the group consisting of terephthalic acid, phthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, cyclohexanedicarboxylic acid, cyclohexanediacetic acid, and combinations thereof;
- (b) a diol selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, 1,4-cyclohexanedimethanol, and combinations thereof;
- and
- (c) a difunctional sulfomonomer selected from the group consisting of sulfophthalic acid, sulfoterephthalic acid, sulfoisophthalic acid, 4-sulfonaphthalene-2,7-dicarboxylic acid, and esters thereof, provided the difunctional sulfomonomer is present in an amount from 12 to 25 mole percent based on 100 mole percent dicarboxylic acid and 100 mole percent diol.
Dependencies are inferred from the claim text.