Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Removal of chromium
As for the removal of hexavalent chromium, which one is more effective and cheaper, ion exchange resin and activated carbon?
Jing HuHong Kong University of Science & Technology - Hong Kong, China
2003
What medium are you trying to remove Cr6+ from? And why?
Jonathan Timms- Hong Kong
2003
Why don't you try 10% solution of NaHSO3 and 10% solution H2SO4? Too much sludge? You can use it in constructions or dissolve it and recover chromium. I think that other technologies are too expensive. Am I wrong? If you have new informations about this subject, please let me know. What about the chromic bacteria - biological treatments?
Amelia-Anca Neagu- Bucuresti, Romania
2003
Reduce it first to trivalent chromium otherwise it will react with almost any organic medium. This can be done with sodium metabisulphite. The trivalent chromium can then be precipitated out as a sludge and caked up.
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
2003
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