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:
Jun. 21, 1983
Filed:
Jan. 12, 1982
Applicant:
Inventor:
Kenneth L Parks, Plant City, FL (US);
Assignee:
Agrico Chemical Company, Tulsa, OK (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01F / ; C01F / ; C01F / ; C01B / ;
U.S. Cl.
CPC ...
423167 ; 423304 ; 423319 ; 432 15 ;
Abstract
A multiple-stage thermal beneficiation process for phosphate ores which comprises calcining a phosphate ore in a first stage at a temperature sufficient to destroy substantial quantities of organic impurities in the phosphate ore but not so high as to cause excessive sulfide formation; followed by the calcining of the product from the first stage in a second stage at a temperature at which an additional amount of organic carbon impurities are destroyed but at a temperature which does not detrimentally reduce the surface area of the phosphate ore.