In the north of Orrisa State, ...

Published October 25, 2016 10:53 by J.J.P. (Hans) Zijlstra, Director at GeoChemTec

In the north of Orrisa State, you have a couple of sponge iron plants that may provide reduced iron (waste) materials for the reduction of mobile toxic chromate to immobile and relatively harmless chromite. In the south of the State, you have bauxite refineries that produce iron-oxide rich red mud waste, which, after acidification, provides a good adsorbent for chromate.

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Is it economical to acidify the red mud supposed to employ as adsorbent? How about the leaching of different heavy metals in red mud when it is applied for adsorption of Cr in acidic range?

Published October 26, 2016 07:43 by LALA BEHARI SUKLA, Research Professor , Siksha 'O' Anusandhan University, Bhubaneswar

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As concerns economics, it depends on too many (local) factors to give a proper answer. The Red Mud has considerable acid neutralizing capacity of up to 4 moles per kg at the pH 5.5 of maximum chromate adsorption capacity. Leached concentrations of metal(oid)s at that pH remain well below European limit concentrations for inert (waste) solids. You may find some publications on: https://www.researchgate.net/profile/JJP_Hans_Zijlstra2/timeline/publications

Published October 27, 2016 12:14 by J.J.P. (Hans) Zijlstra, Director at GeoChemTec

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