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:
Jan. 02, 1979
Filed:
Jul. 18, 1977
Applicant:
Inventors:
Robert H Edwards, Whitehaven, GB;
Thomas A Williams, Backermet, GB;
Assignee:
Albright & Wilson Limited, Oldbury, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C05B / ; C05B / ;
U.S. Cl.
CPC ...
71 34 ; 71 36 ; 71 43 ; 423309 ; 423310 ; 423313 ; 4233 / ;
Abstract
When crude wet process phosphoric acid is solvent extracted, an aqueous raffinate containing phosphoric acid and a small amount of solvent is produced as a by-product. Certain materials are added to the raffinate, in order to produce two phases, one aqueous and the other of solvent. The phases are separated, the solvent recycled for reuse in a solvent extraction process and the aqueous phase treated with ammonia or alkali or alkaline earth metal compounds to form a fertilizer or other phosphate salt.