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:
Dec. 29, 1987
Filed:
Jan. 22, 1986
Applicant:
Inventors:
James R Gruber, Lakeland, FL (US);
Ernest A Gudath, Brandon, FL (US);
Dennis H Michalski, Lakeland, FL (US);
Robert R Riddle, Lakeland, FL (US);
Regis R Stana, Lakeland, FL (US);
Assignee:
International Minerals & Chemical Corp., Terre Haute, IN (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
423167 ; 426 74 ;
Abstract
An improved process for the thermal defluorination of phosphate rock is provided. The process comprises adding ammonia to the phosphoric acid fed to the kiln, the amount of ammonia added being effective for forming a eutectic with the fused ring and ball materials and heating the mixture with agitation to defluorinating temperatures for a period of time sufficient to defluorinate the rock and recovering the defluorinated rock.