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Recovery of chromium from plating wastes

Conference · · Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States)
OSTI ID:6326017
Recovery of chromium from a plating sludge is discussed. The process consists of two parts: roasting the sludge with sodium carbonate (Na/sub 2/CO/sub 3/) andcalcium oxide (CaO), followed by leaching. The optimal parameters for roasting are a temperature range of 950 to 1000/sup 0/C and Na/sub 2/CO/sub 3/ and CaO contents of 2.4 and 2.8 mol per mole of chromium oxide (Cr/sub 2/O/sub 3/) respectively. Demineralized water is recommended for the leaching of sodium chromate (Na/sub 2/CrO/sub 4/) from the agglomerate formed during roasting. The leached water is recycled through a strongly acidic cation exchanger followed by a weakly basic anion exchanger. A solution of chromate or chromic acid having a concentration up to 60 kg Cr/m/sup 3/ is obtained.
Research Organization:
Department of Environmental Chemistry and Technology, Technical University of Lublin (Politechnika Lubelska), Lublin
OSTI ID:
6326017
Report Number(s):
CONF-8303191-
Conference Information:
Journal Name: Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States) Journal Volume: STP-851
Country of Publication:
United States
Language:
English

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