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 |
|---|---|
| Uncontrolled Keywords: | Stainless steel dust; roasting; sodium chromate; leaching |
| Subjects: | Metallurgy |
| Divisions: | Metal Extraction and Forming |
| Depositing User: | Users 5 not found. |
| Date Deposited: | 19 Apr 2012 12:11 |
| Last Modified: | 19 Apr 2012 12:11 |
| URI: | http://eprints.nmlindia.org/id/eprint/5021 |
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