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:
Apr. 27, 1982
Filed:
Jun. 30, 1980
John A Hermann, Oklahoma City, OK (US);
Michael F Lucid, Houston, TX (US);
Kerr-McGee Chemical Corporation, Oklahoma City, OK (US);
Abstract
A method of stabilizing wet process phosphoric acid containing acid soluble impurities preparatory to solvent extraction for the recovery of valuable minerals. The acid is introduced into a vessel containing crystal seed bed of the impurities. A portion of the acid then is withdrawn and concentrated to effect supersaturation of the impurities contained therein. The supersaturated acid is returned to the vessel to mix with the remaining solution and cause additional impurities to precipitate. Thereafter, a portion of the solution, containing precipitated impurities, is withdrawn and introduced into a separator. In the separator, the solution is separated into an essentially solids-free stream containing unprecipitated soluble impurities and a solids-containing stream. The solids-free stream is admixed with an aqueous diluent to dilute it to a concentration level below the concentration at which the precipitable impurities are saturated therein but without a substantial change in phosphate concentration to thereby stabilize the acid stream. The stabilized acid is contacted with an organic extractant to selectively extract at least one of the remaining unprecipitated soluble impurities without substantial precipitation of any other of the remaining soluble impurities.