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公开(公告)号：US20190177178A1
公开(公告)日：2019-06-13
申请号：US16213243
申请日：2018-12-07
Applicant: Worcester Polytechnic Institute
Inventor： Sumedh Gostu , Brajendra Mishra
Abstract: A low-temperature leaching operation employs a raw, red mud slurry directly from aluminum production for an oxalic acid leaching of ferric oxalate. Residual calcium, titanium, aluminum and other rare earths are also recoverable in a secondary stream. Monitoring and control of the pH of the leach solution yields soluble ferric oxalate without high temperatures or specific radiation or light sources. Addition of iron powder results in precipitation of ferrous oxalate, isolated by magnetic separation from the iron powder which recirculates in the solution. Magnetite may then be produced by heating the ferrous oxalate in low pO2 conditions.
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