PROCESS FOR RECOVERING CHROMIC ANHYDRIDE FROM EXHAUSTED AQUEOUS CHROMIUM PLATING BATH SOLUTIONS WITH EXPLOITATION OF THE RECOVERED CHROMIUM

摘要

we'll get the chromic acid content in soluble form (chromic acid) in electroplating bath of chromium polluted alkali liquid used in electroplating of chromium depleted at a ph between 3 and 7, and a temperature of 70oc) with a solution of hy sodium hydroxide is commercially available.in the body in response to temperature for one hour and the precipitate and separating by filtration.the filtered solution, which has a density of 1.25 kg / l, containing cro3 (22% by weight), which is then reduced with sulfur dioxide to produce a solution containing chromium sulfate and sodium sulfate. intended for use as a tanning float, thereby, to high pollution and use the residual chromium.the solution containing cro3 can also be introduced into the production cycle of hexavalent chromium salts.