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公开(公告)号：US11028461B2
公开(公告)日：2021-06-08
申请号：US16030041
申请日：2018-07-09
Applicant: Worcester Polytechnic Institute
Inventor： Marion H. Emmert , Remya P. Narayanan
Abstract: Recovery of scandium from mined red mud includes adding an acid to a quantity of red mud for converting oxides in the red mud, and roasting the quantity of red mud for decomposing compounds having low thermal stability, typically iron and titanium. Water is added to the roasted red mud for leaching the converted oxides into a leach liquor mixture including scandium and other dissolved rare earths, and the leach liquor mixture is agitated by sonication or ball milling to increase an exposed surface area of red mud particles in the leach liquor. PH of the leach liquor is adjusted to precipitate the rare earths while leaving the scandium in solution in the leach liquor, followed by precipitating the separated scandium oxalate remaining in the leach liquor by reducing the pH and adding oxalic acid. Precipitated scandium oxalate may then be filtered from the leach liquor.
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公开(公告)号：US20190040494A1
公开(公告)日：2019-02-07
申请号：US16030041
申请日：2018-07-09
Applicant: Worcester Polytechnic Institute
Inventor： Marion H. Emmert , Remya P. Narayanan
Abstract: Recovery of scandium from mined red mud includes adding an acid to a quantity of red mud for converting oxides in the red mud, and roasting the quantity of red mud for decomposing compounds having low thermal stability, typically iron and titanium. Water is added to the roasted red mud for leaching the converted oxides into a leach liquor mixture including scandium and other dissolved rare earths, and the leach liquor mixture is agitated by sonication or ball milling to increase an exposed surface area of red mud particles in the leach liquor. PH of the leach liquor is adjusted to precipitate the rare earths while leaving the scandium in solution in the leach liquor, followed by precipitating the separated scandium oxalate remaining in the leach liquor by reducing the pH and adding oxalic acid. Precipitated scandium oxalate may then be filtered from the leach liquor.
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公开(公告)号：US10351931B2
公开(公告)日：2019-07-16
申请号：US14996538
申请日：2016-01-15
Applicant: Worcester Polytechnic Institute
Inventor： Marion H. Emmert , H. M. Dhammika Bandara
Abstract: Extraction of rare earths from end-of-use machinery having rare earth magnets provides a closed-loop process towards recycling rare earths from commingled devices having embedded magnets such as motors, generators and disk drives. A low temperature process selectively leaches the magnet material from mixed scrap containing shredded fragments of the machinery which includes other metals such as steel and copper. Filtration separates the other metals from the leached, dissolved magnet material, which is precipitated by oxalic acid to form oxalates in powder form, suitable for use in production of new rare earth magnetic material. Leaching acid, such as HCl (hydrochloric acid), is recoverable via pyrohydrolysis, and redirected back to the leaching step for completing the closed-loop aspect.
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公开(公告)号：US20160208364A1
公开(公告)日：2016-07-21
申请号：US14996538
申请日：2016-01-15
Applicant: Worcester Polytechnic Institute
Inventor： Marion H. Emmert , H.M. Dhammika Bandara
CPC classification number: C22B59/00 , C22B1/00 , C22B1/005 , C22B7/007 , Y02P10/216 , Y02P10/234 , Y02P10/236
Abstract: Extraction of rare earths from end-of-use machinery having rare earth magnets provides a closed-loop process towards recycling rare earths from comingled devices having embedded magnets such as motors, generators and disk drives. A low temperature process selectively leaches the magnet material from mixed scrap containing shredded fragments of the machinery which includes other metals such as steel and copper. Filtration separates the other metals from the leached, dissolved magnet material, which is precipitated by oxalic acid to form oxalates in powder form, suitable for use in production of new rare earth magnetic material. Leaching acid, such as HCl (hydrochloric acid), is recoverable via pyrohydrolysis, and redirected back to the leaching step for completing the closed-loop aspect.
Abstract translation: 从具有稀土磁体的使用终端的机器中提取稀土提供了一个闭环过程，用于从具有嵌入式磁体（如电机，发电机和磁盘驱动器）的嵌入式设备中回收稀土。 低温过程选择性地将磁铁材料从含有包括诸如钢和铜的其它金属的机械碎片的混合废料中浸出。 过滤将其他金属与浸出的溶解的磁性材料分离，其通过草酸沉淀形成粉末形式的草酸盐，适用于生产新的稀土磁性材料。 浸出酸如盐酸（盐酸）可通过热解解回收，并重新返回到浸出步骤以完成闭环方面。
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