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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。

3. 发明授权

US09068249B2 Rare earth element recovery method 有权
标题翻译：稀土元素回收法
公开(公告)号：US09068249B2
公开(公告)日：2015-06-30
申请号：US14363676
申请日：2012-12-07
申请人： NIPPON LIGHT METAL COMPANY, LTD.
发明人： Kaoru Sugita , Yuji Ota , Yoshihiro Taguchi , Satoshi Takeda
IPC分类号： C22B3/00 , C22B3/44 , C22B59/00 , C22B3/10 , C22B3/06 , C22B3/38 , B09B3/00
CPC分类号： C22B59/00 , B09B3/0016 , C22B3/0067 , C22B3/06 , C22B3/065 , C22B3/10 , Y02P10/234
摘要： Provided is a method of recovering rare-earth elements, including causing rare-earth elements particularly including Nd and Dy to leach efficiently from a raw material for leaching which contains the rare-earth elements, and separating and recovering the rare-earth elements. The method of recovering rare-earth elements includes: a leaching step including performing leaching treatment of rare-earth elements in which an acidic slurry of a raw material for leaching which contains the rare-earth elements is held under a predetermined condition, and then subjecting the slurry obtained after the leaching treatment to solid-liquid separation, yielding a leachate containing the rare-earth elements; and a separation step of separating and recovering the rare-earth elements from the yielded leachate, in which: the raw material for leaching contains Ca as CaO at a ratio of 4 to 15 mass % and Ti as TiO2 at a ratio of 2 to 13 mass % in a solid component (S); an acid aqueous solution is an acid aqueous solution of hydrochloric acid and/or nitric acid; and the leaching treatment performed in the leaching step is digestion or maceration which is performed under the heating and pressurizing conditions of a temperature of 160 to 300° C. and a pressure of 0.65 to 10 MPa, and the rare-earth elements are caused to leach together with Ca in the leaching step.
摘要翻译：提供一种回收稀土元素的方法，包括使特别包括Nd和Dy的稀土元素从含有稀土元素的浸出原料中有效地浸出，并分离和回收稀土元素。回收稀土元素的方法包括：浸出步骤，包括进行稀土元素的浸出处理，其中将含有稀土元素的浸出原料的酸性浆料保持在预定条件下，然后在浸出处理后获得的浆液进行固液分离，产生含有稀土元素的渗滤液; 以及从所得到的浸出液中分离回收稀土元素的分离工序，其中：浸出原料中含有Ca为CaO，比例为4〜15质量％，Ti为TiO 2，比例为2〜13 固体组分（S）中的质量％; 酸性水溶液是盐酸和/或硝酸的酸性水溶液; 并且在浸出步骤中进行的浸出处理是在160〜300℃的温度和0.65〜10MPa的加热加压条件下进行的消化或浸渍，并且使稀土元素在浸出步骤中与Ca一起浸出。

4. 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。

5. 发明授权

US09422611B2 Al—Sc alloy manufacturing method 有权
标题翻译： Al-Sc合金制造方法
公开(公告)号：US09422611B2
公开(公告)日：2016-08-23
申请号：US14424348
申请日：2013-06-26
申请人： NIPPON LIGHT METAL COMPANY, LTD.
发明人： Kaoru Sugita , Masato Yatsukura
IPC分类号： C22C1/02 , C22C21/00 , C22B21/06
CPC分类号： C22C1/026 , C22B21/062 , C22C1/02 , C22C21/00
摘要： Provided is a method of producing an Al—Sc based alloy suitable for production of an Al—Sc based alloy that: eliminates the needs for equipment for heating in an inert gas atmosphere or a vacuum atmosphere, a reducing agent such as metal Ca, and equipment and power for molten salt electrolysis; can be performed adequately by heating up to 1,050° C.; and enables continuous operation. The method of producing an Al—Sc based alloy includes: loading into a reaction vessel metal aluminum (Al), a metal fluoride salt, and a scandium compound; elevating a temperature of a reaction system to from 700 to 1,050° C. to form a molten metal layer including molten metal aluminum serving as a lower layer and a molten salt layer in which the metal fluoride salt and the scandium compound are melted serving as an upper layer; and transferring a scandium ion (Sc3+) generated in the molten salt layer side to the molten metal layer side. The metal fluoride salt has a melting temperature lower than the reaction temperature and has a density in a range of from 70 to 95% of the density of the molten metal aluminum, at the reaction temperature.
摘要翻译：本发明提供一种适用于生产Al-Sc系合金的Al-Sc系合金的制造方法，其不需要在惰性气体气氛或真空气氛中加热的设备，还原剂如金属Ca，以及熔盐电解设备和电源; 可以通过加热至1050°F来充分进行。并可连续运行。制备Al-Sc系合金的方法包括：向反应容器中加入金属铝（Al），金属氟化物盐和钪化合物; 将反应体系的温度升高至700〜1050℃，形成作为下层的熔融金属铝和熔融金属盐和钪化合物熔融的熔融盐层的熔融金属层，上层; 并将在熔融盐层侧产生的钪离子（Sc3 +）转移到熔融金属层侧。在反应温度下，金属氟化物盐的熔点比反应温度低，密度在熔融金属铝的密度的70〜95％的范围内。

6. 发明申请

US20140283652A1 RARE EARTH ELEMENT RECOVERY METHOD 有权
标题翻译：稀土元素回收方法
公开(公告)号：US20140283652A1
公开(公告)日：2014-09-25
申请号：US14363676
申请日：2012-12-07
申请人： NIPPON LIGHT METAL COMPANY, LTD.
发明人： Kaoru Sugita , Yuji Ota , Yoshihiro Taguchi , Satoshi Takeda
IPC分类号： C22B59/00
CPC分类号： C22B59/00 , B09B3/0016 , C22B3/0067 , C22B3/06 , C22B3/065 , C22B3/10 , Y02P10/234
摘要： Provided is a method of recovering rare-earth elements, including causing rare-earth elements particularly including Nd and Dy to leach efficiently from a raw material for leaching which contains the rare-earth elements, and separating and recovering the rare-earth elements. The method of recovering rare-earth elements includes: a leaching step including performing leaching treatment of rare-earth elements in which an acidic slurry of a raw material for leaching which contains the rare-earth elements is held under a predetermined condition, and then subjecting the slurry obtained after the leaching treatment to solid-liquid separation, yielding a leachate containing the rare-earth elements; and a separation step of separating and recovering the rare-earth elements from the yielded leachate, in which: the raw material for leaching contains Ca as CaO at a ratio of 4 to 15 mass % and Ti as TiO2 at a ratio of 2 to 13 mass % in a solid component (S); an acid aqueous solution is an acid aqueous solution of hydrochloric acid and/or nitric acid; and the leaching treatment performed in the leaching step is digestion or maceration which is performed under the heating and pressurizing conditions of a temperature of 160 to 300° C. and a pressure of 0.65 to 10 MPa, and the rare-earth elements are caused to leach together with Ca in the leaching step.
摘要翻译：提供一种回收稀土元素的方法，包括使特别包括Nd和Dy的稀土元素从含有稀土元素的浸出原料中有效地浸出，并分离和回收稀土元素。回收稀土元素的方法包括：浸出步骤，包括进行稀土元素的浸出处理，其中将含有稀土元素的浸出原料的酸性浆料保持在预定条件下，然后在浸出处理后获得的浆液进行固液分离，产生含有稀土元素的渗滤液; 以及从所得到的浸出液中分离回收稀土元素的分离工序，其中：浸出原料中含有Ca为CaO，比例为4〜15质量％，Ti为TiO 2，比例为2〜13 固体组分（S）中的质量％; 酸性水溶液是盐酸和/或硝酸的酸性水溶液; 并且在浸出步骤中进行的浸出处理是在160〜300℃的温度和0.65〜10MPa的加热加压条件下进行的消化或浸渍，并且使稀土元素在浸出步骤中与Ca一起浸出。

7. 发明申请

US20150232965A1 Al-Sc ALLOY MANUFACTURING METHOD 有权
标题翻译： Al-Sc合金制造方法
公开(公告)号：US20150232965A1
公开(公告)日：2015-08-20
申请号：US14424348
申请日：2013-06-26
申请人： NIPPON LIGHT METAL COMPANY, LTD.
发明人： Kaoru Sugita , Masato Yatsukura
IPC分类号： C22C1/02 , C22C21/00
CPC分类号： C22C1/026 , C22B21/062 , C22C1/02 , C22C21/00
摘要： Provided is a method of producing an Al—Sc based alloy suitable for production of an Al—Sc based alloy that: eliminates the needs for equipment for heating in an inert gas atmosphere or a vacuum atmosphere, a reducing agent such as metal Ca, and equipment and power for molten salt electrolysis; can be performed adequately by heating up to 1,050° C.; and enables continuous operation. The method of producing an Al—Sc based alloy includes: loading into a reaction vessel metal aluminum (Al), a metal fluoride salt, and a scandium compound; elevating a temperature of a reaction system to from 700 to 1,050° C. to form a molten metal layer including molten metal aluminum serving as a lower layer and a molten salt layer in which the metal fluoride salt and the scandium compound are melted serving as an upper layer; and transferring a scandium ion (Sc3+) generated in the molten salt layer side to the molten metal layer side. The metal fluoride salt has a melting temperature lower than the reaction temperature and has a density in a range of from 70 to 95% of the density of the molten metal aluminum, at the reaction temperature.
摘要翻译：本发明提供一种适用于生产Al-Sc系合金的Al-Sc系合金的制造方法，其不需要在惰性气体气氛或真空气氛中加热的设备，还原剂如金属Ca，以及熔盐电解设备和电源; 可以通过加热至1050°F来充分进行。并可连续运行。制备Al-Sc系合金的方法包括：向反应容器中加入金属铝（Al），金属氟化物盐和钪化合物; 将反应体系的温度升高至700〜1050℃，形成作为下层的熔融金属铝和熔融金属盐和钪化合物熔融的熔融盐层的熔融金属层，上层; 并将在熔融盐层侧产生的钪离子（Sc3 +）转移到熔融金属层侧。在反应温度下，金属氟化物盐的熔点比反应温度低，密度在熔融金属铝的密度的70〜95％的范围内。

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