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公开(公告)号：US10280482B2
公开(公告)日：2019-05-07
申请号：US15736874
申请日：2016-06-16
Applicant: GRIREM ADVANCED MATERIALS CO., LTD.
Inventor： Xiaowei Huang , Yang Xu , Jinyu Wang , Liangshi Wang , Zongyu Feng , Dali Cui , Zhiqi Long , Xu Sun , Na Zhao
IPC: C22B7/00 , C01F7/04 , C01F7/06 , C01F7/22 , C01F7/24 , C01F7/26 , C01F17/00 , C22B21/00 , C22B59/00 , C22B3/44
Abstract: Disclosed is a method of recovering rare earth, aluminum and silicon from rare earth-containing aluminum-silicon scrap. The method comprises: S1, acid-leaching the rare earth-containing aluminum-silicon scrap with an inorganic acid aqueous solution to obtain a silicon-rich slag and acid leached solution containing rare earth and aluminum element; S2, adding an alkaline substance into the acid leached solution containing the rare earth and aluminum element and controlling a PH value of the acid leaching solution between 3.5 to 5.2, performing a solid-liquid separation to obtain a aluminum hydroxide-containing precipitate and a rare earth-containing solution filter; S3, reacting the aluminum hydroxide containing precipitate with sodium hydroxide to obtain sodium metaaluminate solution and aluminum-silicon slag, and preparing a rare earth compound product with the rare earth-containing filtrate. The method dissolves an the aluminum and the rare earth with the acid and then via step wise alkaline conversion, convert aluminum icons to an aluminum hydroxide precipitate separated from rare earth ions, and then adds excessive amounts of sodium hydroxide to convert the aluminum hydroxide to a sodium metaaluminate solution, thereby realizing high-efficiency recovery of both rare earth and aluminum while significantly reducing the consumption of the sodium hydroxide and thus recovery cost.
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公开(公告)号：US09752213B2
公开(公告)日：2017-09-05
申请号：US14430268
申请日：2013-09-29
Applicant: Grirem Advanced Materials Co., Ltd.
Inventor： Liangshi Wang , Zhiqi Long , Dali Cui , Xiaowei Huang , Ying Yu , Yang Xu , Xingliang Feng
CPC classification number: C22B59/00 , C22B1/02 , C22B3/10 , Y02P10/234
Abstract: A method for comprehensively recovering rare earth elements and fluorine element in a bastnaesite treatment process. The method comprises: oxidation roasting a bastnaesite, and leaching a roasted mixture using a hydrochloric acid, adding a roasting promoter to the bastnaesite during the roasting process; and/or during the leaching process using the hydrochloric acid, adding a catalytic leaching promoter into the mixture, obtaining a rare earth chloride solution containing little cerium element and a cerium-rich residue containing the fluorine element; and separating and recovering rare earth fluorides from the cerium-rich residue.
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3.发明申请公开(公告)号：US20150252449A1
公开(公告)日：2015-09-10
申请号：US14430268
申请日：2013-09-29
Applicant: Grirem Advanced Materials Co., Ltd.
Inventor： Liangshi Wang , Zhiqi Long , Dali Cui , Xiaowei Huang , Ying Yu , Yang Xu , Xingliang Feng
CPC classification number: C22B59/00 , C22B1/02 , C22B3/10 , Y02P10/234
Abstract: A method for comprehensively recovering rare earth elements and fluorine element in a bastnaesite treatment process. The method comprises: oxidation roasting a bastnaesite, and leaching a roasted mixture using a hydrochloric acid, adding a roasting promoter to the bastnaesite during the roasting process; and/or during the leaching process using the hydrochloric acid, adding a catalytic leaching promoter into the mixture, obtaining a rare earth chloride solution containing little cerium element and a cerium-rich residue containing the fluorine element; and separating and recovering rare earth fluorides from the cerium-rich residue.
Abstract translation: 稀土元素和氟元素的综合回收方法。 该方法包括：将焙烧方法进行氧化焙烧，并用盐酸浸出焙烧混合物，并在焙烧过程中向焙烧炉中加入焙烧促进剂; 和/或在使用盐酸的浸出过程中，在混合物中加入催化浸出促进剂，得到含有少量铈元素的稀土氯化物溶液和含有氟元素的富铈残渣; 并从富铈残渣中分离回收稀土氟化物。
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4.发明申请公开(公告)号：US20180363098A1
公开(公告)日：2018-12-20
申请号：US15736874
申请日：2016-06-16
Applicant: GRIREM ADVANCED MATERIALS CO., LTD.
Inventor： Xiaowei Huang , Yang Xu , Jinyu Wang , Liangshi Wang , Zongyu Feng , Dali Cui , Zhiqi Long , Xu Sun , Na Zhao
CPC classification number: C22B7/007 , C01F7/04 , C01F7/0693 , C01F7/22 , C01F7/24 , C01F7/26 , C01F17/0006 , C01F17/0043 , C01F17/0068 , C01F17/0075 , C22B7/00 , C22B21/0023 , C22B59/00 , Y02P10/234
Abstract: Disclosed is a method of recovering rare earth, aluminum and silicon from rare earth-containing aluminum-silicon scrap. The method comprises: S1, acid-leaching the rare earth-containing aluminum-silicon scrap with an inorganic acid aqueous solution to obtain a silicon-rich slag and acid leached solution containing rare earth and aluminum element; S2, adding an alkaline substance into the acid leached solution containing the rare earth and aluminum element and controlling a PH value of the acid leaching solution between 3.5 to 5.2, performing a solid-liquid separation to obtain a aluminum hydroxide-containing precipitate and a rare earth-containing solution filter; S3, reacting the aluminum hydroxide containing precipitate with sodium hydroxidee to obtain sodium metaaluminate solution and aluminum-silicon slag, and preparing a rare earth compound product with the rare earth-containing filtrate. The method dissolves an the aluminum and the rare earth with the acid and then via step wise alkaline conversion, convert aluminum icons to an aluminum hydroxide precipitate separated from rare earth ions, and then adds excessive amounts of sodium hydroxide to convert the aluminum hydroxide to a sodium metaaluminate solution, thereby realizing high-efficiency recovery of both rare earth and aluminum while significantly reducing the consumption of the sodium hydroxide and thus recovery cost.
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