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.

公开(公告)号：US12109551B2

公开(公告)日：2024-10-08

申请号：US17422691

申请日：2020-09-04

Applicant: GRIREM ADVANCED MATERIALS CO., LTD. ,  Rare Earth Functional Materials (Xiong 'an) Innovation Center Co., Ltd. ,  GRIREM HI-TECH CO., LTD.

Inventor： Xiaowei Huang ,  Yongqi Zhang ,  Hongwei Li ,  Zhizhe Zhai ,  Qiang Zhong ,  He Zhang ,  Meisheng Cui ,  Yongke Hou ,  Hao Wang ,  Zongyu Feng

IPC: B01J21/06 ,  B01J6/00 ,  B01J23/02 ,  B01J23/10 ,  B01J35/00 ,  B01J35/30 ,  B01J35/39 ,  B01J37/04 ,  F01N3/10

CPC classification number: B01J23/10 ,  B01J6/001 ,  B01J21/066 ,  B01J23/02 ,  B01J35/19 ,  B01J35/397 ,  B01J35/398 ,  B01J37/04 ,  F01N3/10 ,  F01N2570/14

Abstract: The present invention discloses a rare-earth-manganese/cerium-zirconium-based composite compound, a method for preparing the same, and a use thereof. The composite compound is of a core-shell structure with a general formula expressed as: A REcBaOb-(1-A)CexZr(1-x-y)MyO2-z, wherein 0.1≤A≤0.3, preferably 0.1≤A≤0.2; a shell layer has a main component of rare-earth manganese oxide with a general formula of REcMnaOb, wherein RE is a rare-earth element or a combination of more than one rare-earth elements, and B is Mn or a combination of Mn and a transition metal element, 1≤a≤8, 2≤b≤18, and 0.25≤c≤4; and a core has a main component of cerium-zirconium composite oxide with a general formula of CexZr(1-x-y)MyO2-z, wherein M is one or more non-cerium rare-earth elements, 0.1≤x≤0.9, 0≤y≤0.3, and 0.01≤z≤0.3. The composite compound enhances an oxygen storage capacity of a cerium-zirconium material through an interface effect, thereby increasing a conversion rate of a nitrogen oxide.

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

IPC: C22B7/00 ,  C01F7/06 ,  C01F17/00 ,  C01F7/26 ,  C01F7/22 ,  C01F7/24 ,  C22B21/00 ,  C22B59/00

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.