The authoritative public forum
  for Metal Finishing since 1989
-----

Removal of iron from chromium sulphate solution

The problem I need to solve is the removal of iron from a solution of chromium sulphate. The concentration of iron is 300-600 mg/L and chromium is 13-20 g/L; there's also a content of protein of about 20 g/L; the pH is 1-2.5 . I thought to plating iron to reduce the concentration of iron lower than 50 mg/L. I have tried some experiments on 200 mL of solution with bad results. I used as electrodes two wires of plating. The potential of cathode was controlled using an Ag|AgCl electrode. The difference applied was -0.3 V for 3-4 hours.

Thanks in advance for your answer.

Best regards,

David Castagna
- Vicenza, Italy
2001

There are specialty ion exchange resins that can help you. The mining industry has developed some resins that are selective for iron over other cation resins. Other resins can be custom formulated to form complexes of iron within the resin matrix, to the exclusion of chrome.

Juzer Jangbarwala
- Santa Fe Springs, California USA
2001