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:
May. 06, 1980
Filed:
Feb. 09, 1979
Applicant:
Inventor:
Hsiang P Liao, Princeton, NJ (US);
Assignee:
FMC Corporation, Philadelphia, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
C02C / ;
U.S. Cl.
CPC ...
210 50 ;
Abstract
A process for removing arsenic from aqueous mediums by adding, in the presence of phosphorus, sufficient calcium hydroxide to adjust the aqueous medium to a pH of from about 7.0 to 11.5, whereby precipitates of both arsenic and phosphorus are formed and are subsequently separated from the aqueous medium. As a secondary treatment, calcium salts of arsenic and phosphorus in oxidation states lower than +5, and thus dissolved in the aqueous medium are oxidized, as by the addition of chlorine or hypochloride to such medium, and thereby converted to more insoluble forms which are separated from the aqueous medium as precipitates.