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1. 发明申请

US20160251739A1 METHOD OF RECOVERING RARE-EARTH ELEMENTS 审中-公开
标题翻译：恢复稀土元素的方法
公开(公告)号：US20160251739A1
公开(公告)日：2016-09-01
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： C22B3/44 , C22B59/00
CPC分类号： C22B3/44 , C22B3/0068 , C22B7/007 , C22B59/00 , Y02P10/234
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.
摘要翻译：提供了通过进行浸出液的轻微pH调节来回收稀土元素的方法，其不需要如常规方法那样的显着的pH调节，降低成本和努力，并且可以有效地回收矾土残渣中的稀土元素好收益。回收稀土元素的方法是回收稀土元素的方法，该方法包括：将在拜耳法中作为副产物生产的原料铝土矿残渣与一种液体浸出剂回收含稀土元素的渗滤液; 将浸出液与含有磷酸酯系萃取剂的萃取处理液接触以回收含有稀土元素的萃取液的萃取工序; 以及使提取液与后退萃取处理液接触以回收稀土元素的反萃取步骤，所述浸出步骤包括使用酸性液体浸出回收pH为0.5以上且1.2以下的渗滤液所述提取步骤包括将所述浸出液的pH调节至1.0以上且1.7以下，然后使所述浸出液与所述萃取处理液接触。

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