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. 08, 1981
Filed:
Nov. 07, 1980
Applicant:
Inventor:
Walfred W Jukkola, Westport, CT (US);
Assignee:
Dorr-Oliver Incorporated, Stamford, CT (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C01F / ; F27B / ; B01J / ;
U.S. Cl.
CPC ...
422142 ; 422145 ; 422146 ; 423167 ; 423D / ; 432 15 ; 432 58 ; 432 72 ;
Abstract
In order to increase or maintain the capacity of fluid bed calciners in the calcination of phosphate rock containng large amounts of organic matter ('hot rocks'), the calciner is modified to permit a pyrolysis reaction to occur in the freeboard zone of the calciner. The hydrocarbons and carbon monoxide gas produced by the pyrolysis reaction are removed from the calciner and burned in an afterburner unit. Dust and fines entrained in the exhaust from the calciner are sent to a dust oxidation chamber outside the calciner for oxidation by addition of air.