|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deriving Value from Challenging Waste Streams: Recycling and Sustainability Joint Session
||Hydrothermal Process to Convert Hematite in Red-mud to Magnetite
||Sumedh Gostu, Brajendra Mishra
|On-Site Speaker (Planned)
Red-mud a residue generated from the Bayer’s process to treat Bauxite ore is subjected to a hydrothermal process. Jamaican Red-mud (~60 wt % Hematite) is leached in oxalic acid: 95 oC, 15 % solids, 2.5 h, 550 rpm, 2.5 M oxalic acid solution. 100 % conversion of hematite in red-mud to ferric oxalate was obtained while Calcium and REE’s separated as undissolved oxalates, constituting the residue. The ferric oxalate was subjected to reduction using iron powder/scraps to obtain solid ferrous oxalate precipitate. The precipitation process was optimized varying time, temperature and Fe+3/Fe. Aluminum and Titanium remained in the pregnant leach solution. Ferrous oxalate was subjected to a thermal treatment in N2 atmosphere (low PO2) to obtain a high purity saleable magnetite.