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:
May. 29, 1979
Filed:
Jul. 21, 1976
Samuel L Bean, Jamesville, NY (US);
Walter R Buckman, Syracuse, NY (US);
Allied Chemical Corporation, Morristown, NY (US);
Abstract
A concentrated calcium fluoride ore, having a decreased foam value which is particularly adapted for the manufacture of hydrogen fluoride is provided by a process which comprises: (a) grinding calcium fluoride ore containing calcite and quartzite particles to form calcium fluoride particles and to liberate at least a portion of said calcite and quartzite particles; (b) admixing the ground ore with aqueous medium and an effective amount of a suitable flotation agent to form a first aqueous slurry containing said flotation agent and calcium fluoride, calcite and quartzite particles; (c) contacting said first aqueous slurry with a gas under conditions sufficient to produce (i) a foam containing a major portion of said flotation agent and foamed particles comprising calcium fluoride particles together with a minor portion of the calcite and quartzite particles in said first slurry, and (ii) separated solids containing a major portion of the calcite and quartzite particles in said first slurry; (d) recovering at least a portion of said foam containing said foamed particles and said flotation agent portion as a second aqueous slurry; (e) removing from said second slurry a major portion of said foamed particles having a particle size of less than about 10 microns, thereby producing a thickened aqueous slurry containing calcium fluoride particles; and (f) recovering calcium fluoride particles from said thickened aqueous slurry as product.