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:
Oct. 10, 1978
Filed:
Sep. 16, 1974
Applicant:
Inventors:
Assignee:
Nippon Electric Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C02C / ;
U.S. Cl.
CPC ...
210 50 ; 210 52 ; 210 56 ; 423D / ;
Abstract
On disposing of an acidic aqueous waste including ferrous ions, the ferrous ions are oxidized to produce iron compound precipitate in a remaining waste liquid. With the temperature of the waste kept between 50.degree. C and 75.degree. C and with pH of the waste liquid adjusted between 3.5 and 5.2, fine particles of the iron compound otherwise produced agglomerate into large polycrystalline particles. The large particles are readily separated from the waste liquid, which is now substantially neutral and transparent.