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1. 发明授权

US10246759B2 Method of recovering rare-earth elements 有权
公开(公告)号：US10246759B2
公开(公告)日：2019-04-02
申请号：US14636722
申请日：2015-03-03
申请人： NIPPON LIGHT METAL COMPANY, LTD. , THE JAMAICA BAUXITE INSTITUTE LIMITED
发明人： Kaoru Sugita , Yasushi Kobayashi , Yoshihiro Taguchi , Wilmon Wallen-Bryan , Worrell Lyew You , Parris A Lyew-Ayee
IPC分类号： C22B59/00 , C22B7/00 , C22B3/44 , C22B3/38
摘要： Provided is a method of recovering rare-earth elements by performing slight pH adjustment of a leachate, which does not require such significant pH adjustment as in conventional methods, reduces cost and effort, and can efficiently recover rare-earth elements in a bauxite residue in a good yield. The method of recovering rare-earth elements is a method of recovering rare-earth elements, the method including: a leaching step of bringing a raw material bauxite residue, which is produced as a by-product in a Bayer process, into contact with a liquid leaching agent to recover a leachate containing rare-earth elements; an extraction step of bringing the leachate into contact with an extraction treatment liquid containing a phosphoric acid ester-based extractant to recover an extract liquid containing the rare-earth elements; and a back extraction step of bringing the extract liquid into contact with a back extraction treatment liquid to recover the rare-earth elements, the leaching step including recovering a leachate having a pH of 0.5 or more and 1.2 or less by using an acidic liquid leaching agent, the extraction step including adjusting the pH of the leachate to 1.0 or more and 1.7 or less and then bringing the leachate into contact with the extraction treatment liquid.

2. 发明申请

US20150086449A1 METHOD OF RECOVERING RARE-EARTH ELEMENTS 有权
标题翻译：恢复稀土元素的方法
公开(公告)号：US20150086449A1
公开(公告)日：2015-03-26
申请号：US14389304
申请日：2012-12-07
申请人： NIPPON LIGHT METAL COMPANY, LTD.
发明人： Kaoru Sugita , Yasushi Kobayashi , Yoshihiro Taguchi , Satoshi Takeda , Yuji Ota , Masashi Ojiri , Kazuhiro Oda , Hiroshi Sano
IPC分类号： C22B59/00
CPC分类号： C22B59/00 , B09B3/00 , C01F17/00 , C01F17/0006 , C22B3/0005 , C22B3/04 , C22B3/20 , C22B3/44 , C22B7/00 , C22B7/007 , Y02P10/234 , Y02W30/54
摘要： Provided is a method of recovering rare-earth elements by which rare-earth elements can be recovered efficiently from a bauxite residue serving as a raw material and containing the rare-earth elements. Specifically provided is a method of recovering rare-earth elements from a raw material, the raw material being a bauxite residue produced as a by-product in a Bayer process, the method including: using a bauxite residue having a specific surface area of 35 m2/g or more; adding, to the raw material bauxite residue, a liquid leaching agent formed of an aqueous solution of at least one kind of mineral acid selected from sulfuric acid, hydrochloric acid, nitric acid, and sulfurous acid, thereby preparing a slurry having a liquid-solid ratio of 2 to 30 and a pH of 0.5 to 2.2; subjecting the slurry to leaching treatment of the rare-earth elements under a temperature condition of room temperature to 160° C.; subjecting the slurry after the leaching treatment to solid-liquid separation, yielding a leachate; and separating and recovering the rare-earth elements from the leachate.
摘要翻译：提供一种回收稀土元素的方法，通过稀土元素可以从用作原料的铝土矿残渣中有效地回收并含有稀土元素。具体提供的是从原料中回收稀土元素的方法，原料是在拜耳法中作为副产物生产的铝土矿残渣，该方法包括：使用比表面积为35m 2的铝土矿残渣 / g以上; 向原料铝土矿残渣中添加由选自硫酸，盐酸，硝酸和亚硫酸中的至少一种无机酸的水溶液形成的液体浸出剂，由此制备具有液固的浆料比例为2至30，pH为0.5至2.2; 使该浆液在室温至160℃的温度条件下浸出处理稀土元素; 在浸出处理后对浆料进行固液分离，得到渗滤液; 并从渗滤液中分离回收稀土元素。

3. 发明授权

US09228248B2 Method of recovering rare-earth elements 有权
标题翻译：回收稀土元素的方法
公开(公告)号：US09228248B2
公开(公告)日：2016-01-05
申请号：US14389304
申请日：2012-12-07
申请人： NIPPON LIGHT METAL COMPANY, LTD.
发明人： Kaoru Sugita , Yasushi Kobayashi , Yoshihiro Taguchi , Satoshi Takeda , Yuji Ota , Masashi Ojiri , Kazuhiro Oda , Hiroshi Sano
IPC分类号： C22B59/00 , B09B3/00 , C01F17/00 , C22B3/26 , C22B3/04 , C22B3/20 , C22B3/44 , C22B7/00
CPC分类号： C22B59/00 , B09B3/00 , C01F17/00 , C01F17/0006 , C22B3/0005 , C22B3/04 , C22B3/20 , C22B3/44 , C22B7/00 , C22B7/007 , Y02P10/234 , Y02W30/54
摘要： Provided is a method of recovering rare-earth elements by which rare-earth elements can be recovered efficiently from a bauxite residue serving as a raw material and containing the rare-earth elements. Specifically provided is a method of recovering rare-earth elements from a raw material, the raw material being a bauxite residue produced as a by-product in a Bayer process, the method including: using a bauxite residue having a specific surface area of 35 m2/g or more; adding, to the raw material bauxite residue, a liquid leaching agent formed of an aqueous solution of at least one kind of mineral acid selected from sulfuric acid, hydrochloric acid, nitric acid, and sulfurous acid, thereby preparing a slurry having a liquid-solid ratio of 2 to 30 and a pH of 0.5 to 2.2; subjecting the slurry to leaching treatment of the rare-earth elements under a temperature condition of room temperature to 160° C.; subjecting the slurry after the leaching treatment to solid-liquid separation, yielding a leachate; and separating and recovering the rare-earth elements from the leachate.
摘要翻译：提供一种回收稀土元素的方法，通过稀土元素可以从用作原料的铝土矿残渣中有效地回收并含有稀土元素。具体提供的是从原料中回收稀土元素的方法，原料是在拜耳法中作为副产物生产的铝土矿残渣，该方法包括：使用比表面积为35m 2的铝土矿残渣 / g以上; 向原料铝土矿残渣中添加由选自硫酸，盐酸，硝酸和亚硫酸中的至少一种无机酸的水溶液形成的液体浸出剂，由此制备具有液固的浆料比例为2至30，pH为0.5至2.2; 使该浆液在室温至160℃的温度条件下浸出处理稀土元素; 在浸出处理后对浆料进行固液分离，得到渗滤液; 并从渗滤液中分离回收稀土元素。

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