The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 12, 1988
Filed:
Jul. 07, 1986
Cominco Ltd., British Columbia, CA;
Eastman Kodak Company, Rochester, NY (US);
Abstract
Certain water dissipatable polyester materials containing ether groups and metal sulfonate groups are useful as depressants for siliceous gangue in the froth flotation separation of zinc sulfide concentrates from complex ores containing, minerals of other metals such as lead and iron, as well as various silicon compounds. The polyester materials ae effective in amounts ranging from about 0.03 to about 1.5 kg/tonne of ore feed. Zinc rougher concentrates when conditioned with the depressant yields zinc cleaner concentrates containing less than about 1.5% silica without the need for extensive regrinding of the rougher concentrate. Particularly useful polyester material is prepared from an acid component of from about 80 to 85 mole % isophthalic acid with the remainder comprising mainy 5-sodiosulfoisopthalic acid, and a diol component of from about 50 to 60 mole % diethylene glycol with the remainder comprising mainly 1.4-cyclohexanedimethanol.