Recovery of Valuable Materials from Bauxite Mining Waste for Industrial Application

Abstract:

NALCO is mining the bauxite ore of 63.4 lakh tones per annum for the production of alumina 21.57 lakh of tonnes per annum. During mining of bauxite, partially laterized khondalite (PLK) and kaolinised khondalite rocks are excavated and dumped at mining area or can be used for backfilling. The sample ground and classified to recover fines which are suitable for paper industry. Further, the overflow sample is subjected to leaching studies. Leaching studies were carried out at different concentration, time and temperatures. The experiment shows that the optimum conditions are 1.5M oxalic acid, 70oC temperature and 4 hours time. This product can be used as a coating material on paper industry to increase the brightness. The product is fine and no grit present in it. The iron oxide in the product is 0.72% with brightness is 75%. The product specifications compared with BIS standard for raw material using in paper industry. The other characterization of the product indicates that the raw material is suitable for paper industry.

• Periodical: Materials Science Forum (Volume 978)
• Pages: 537-542
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.978.537
• Online since: February 2020
• Authors: Rudra Narayan Mohapatro, Ranjita Swain*, Sunita Routray, Satyabrata Mohanta
• Keywords: Bauxite Mining Waste, Brightness, Iron Oxide, Oxalic Acid, PLK Rocks

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