Patent ID: 6833124
Filing Date: 2004-12-21
Classification: C02F,C25D,Y10S

Abstract:
A process for recovery of hexavalent chromium from a stream comprising:providing the stream containing hexavalent chromium; reacting a soluble precipitating reagent with the hexavalent chromium to form an insoluble precipitating reagent-chromate precipitate, wherein the soluble precipitating reagent is selected from bismuth compounds; lanthanide compounds; aluminum compounds; titanium compounds, trivalent chromium compounds; organic compounds containing a group selected from nitronium, phosphonium, sulfonium, stibonium, iodonium, pyrylium, or combinations thereof; or combinations thereof; reacting the insoluble precipitating reagent-chromate precipitate with an acidic solution to form an insoluble precipitating reagent precipitate and a soluble hexavalent chromium compound; and recovering the soluble hexavalent chromium compound.