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:
Aug. 22, 1995
Filed:
Oct. 02, 1992
Colin J McKenny, Calgary, CA;
Brian W Raymond, Calgary, CA;
Fording Coal Limited, Calgary, CA;
Abstract
A process for the flotation of particles of lignitic coal, subbituminous coal or oxidized bituminous coal contained within a slurry of coal and gangue, comprising the steps of dispersing a surfactant throughout the slurry, first conditioning the slurry such that the surfaces of the particles of coal are selectively coated by the surfactant to produce activated particles of coal, dispersing an oil throughout the slurry, second conditioning the slurry such that the surfaces of the activated particles of coal are selectively coated by the oil to produce oiled particles of coal, and floating the oiled particles of coal on the surface of the slurry for separation from the slurry and gangue.