A process for recovery of hexavalent chromium from waste streams. The method includes providing a waste stream containing hexavalent chromium, reacting a soluble non-toxic precipitating reagent with the hexavalent chromium to form an insoluble precipitating reagent-chromate precipitate, and recovering the insoluble precipitating reagent-chromate precipitate. It may optionally include 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. The process may also include reacting the insoluble precipitating reagent precipitate with a solubilizing reagent to form the soluble non-toxic precipitating reagent.
一种从废
水中回收六价
铬的方法。该方法包括提供一个含有六价
铬的废
水流,将可溶的无毒沉淀试剂与六价
铬反应,形成不溶性的沉淀试剂-
铬酸盐沉淀物,并回收不溶性的沉淀试剂-
铬酸盐沉淀物。该方法还可以选择性地将不溶性的沉淀试剂-
铬酸盐沉淀物与酸性溶液反应,形成不溶性的沉淀试剂沉淀物和可溶性的六价
铬化合物,并回收可溶性的六价
铬化合物。该过程还可以包括将不溶性的沉淀试剂沉淀物与溶解试剂反应,形成可溶的无毒沉淀试剂。