Extraction of chromium as Sodium Chromate from Stainless Steel Dust

Prasad , Sanjay (2011) Extraction of chromium as Sodium Chromate from Stainless Steel Dust. The Journal of Solid Waste Technology and Management, 37 (1). pp. 40-46.

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The objective of this investigation was to recover chromium as sodium chromate of 99.5% purity from stainless steel dust. The dust contains 7.72% chromium obtained from stainless steel processing plants. The stainless steel dust mostly contained iron in oxide form along with chrom-ium, nickel (1.71%) and manganese (3.55%). The steel dust was roasted with soda ash followed by water leaching to recover the major constituent chromium. It was found that roasting at 1073 K for 90 minutes resulted in maximum (95%) chromium recovery. Kinetics of sodium chromate form-ation followed a topochemical model involving chemical reactions at the surface with activation energy of 39 kJmol-1. TG/DTA, XRD phase identification and SEM micro-photographs confirmed the experimental observation and the mode of reaction.

Item Type:Article
Official URL/DOI:http://eprints.nmlindia.org/5021
Uncontrolled Keywords:Stainless steel dust; roasting; sodium chromate; leaching
Divisions:Metal Extraction and Forming
ID Code:5021
Deposited By:Sahu A K
Deposited On:19 Apr 2012 17:41
Last Modified:19 Apr 2012 17:41
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