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:
Jul. 06, 2004
Filed:
Feb. 21, 2002
Applicant:
Inventors:
Dennis Michalski, Lakeland, FL (US);
Kenneth J. Jardine, Lakeland, FL (US);
Vaughn V. Astley, Lakeland, FL (US);
Assignee:
IMC Global Operations Inc., Lake Forest, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F 1/58 ;
U.S. Cl.
CPC ...
C02F 1/58 ;
Abstract
A simplified process for the partial purification of contaminated phosphoric acid plant pond water having a molar calcium plus magnesium to fluorine ratio greater than or equal to about 0.60, is described, in which the pond water is treated with a basic compound, clarified, aged, clarified again and re-acidified. The thus treated pond water, still containing the majority of the phosphate originally present, can then be concentrated via the removal of essentially pure water, using any conventional means of concentration, without the formation of solid precipitates.