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:
Dec. 11, 1990
Filed:
Nov. 09, 1989
Daniel A Boateng, Montrose, CA;
Cominco Ltd., Vancouver, CA;
Abstract
An arsenate solution is treated by electrolysis with membranes for at least partial conversion into arsenic acid and hydroxide. Electrolysis is carried out in an electrolytic unit containing an arrangement of electrodes and membranes. Depending on the electrode and membrane type and configuration, arsenic acid having a reduced content of alkali metal or ammonium cations and impurities is recovered. Arsenic acid-containing solution and hydroxide solution are removed. An electrolysis unit comprises, preferably, a stack of 2- or 3-compartment cells, comprising at least one electrode/membrane group arranged between terminal electrodes with or without terminal membranes. Each group may comprise a bipolar or a monopolar electrode in combination with either cationic or cationic and anionic membranes. Hydroxide and acid compartments are defined between electrodes and membranes, and diluate compartments may be defined between membranes.