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. 24, 1997
Filed:
Aug. 30, 1995
Applicant:
Inventors:
Thierry Delloye, Perigny, FR;
Antoine Dissaux, Houston, TX (US);
Assignee:
Rhone-Poulenc Chimie, Courbevoie Cedex, FR;
Primary Examiner:
Int. Cl.
CPC ...
C02F / ;
U.S. Cl.
CPC ...
210717 ; 210724 ; 210726 ;
Abstract
Impure liquid media containing contaminating amounts of metallic impurities, e.g., alkaline earth metals, heavy metals and/or radioactive elements, for example industrial effluents from the nitric acidulation of rare earth concentrates, are purified by separately introducing a source of phosphorus and a source of barium into the impure medium, whereby precipitating a solid residue which comprises a barium phosphate having such contaminating metallic impurities distributed therein, and thence separating the solid residue from the liquid medium thus purified.