Recovery of Rare-Earth Elements from Molten Salt Electrolytic Slag by Fluorine Fixation Roasting and Leaching
文献类型：期刊论文
| 作者 | Xing, Peng1,2; Li, Huiquan1,2,3; Ye, Chunlin4; Zhong, Liqin4 |
| 刊名 | JOURNAL OF SUSTAINABLE METALLURGY
 |
| 出版日期 | 2022-03-01 |
| 卷号 | 8期号:1页码:522-531 |
| 关键词 | Rare-earth elements Molten salt electrolytic slag Fluorine fixation roasting Leaching |
| ISSN号 | 2199-3823 |
| DOI | 10.1007/s40831-022-00503-1 |
| 英文摘要 | Recycling waste containing rare earth has always been a research hotspot. The molten salt electrolysis process of rare-earth metals and alloys generates a large amount of waste slag, which contains high rare-earth content and, thus, has very considerable recovery value. However, the high content of fluorine in rare-earth molten salt slag brings challenges to the separation of rare-earth elements (REEs) and fluorine. So far, there are few literatures on the recovery of REEs from this slag. Although the reported alkali roasting-leaching process can recover REEs from the slag, it has serious environmental drawbacks, such as the emission of the fluorine-containing wastewater. Herein, this study presents a clean process for recycling REEs molten salt electrolytic slag. The REEs were recovered via fluorine fixation roasting using calcium oxide and calcium chloride and hydrometallurgical leaching in hydrochloric acid solution. The leaching efficiencies of REEs were > 97% under optimum conditions: roasting temperature of 973 K, calcium oxide dosage of 30%, calcium chloride dosage of 10%, HCl concentration of 3 mol/L, and leaching temperature of 363 K. In the roasting process, rare-earth fluorides were converted into oxides by calcium oxide. The addition of calcium chloride with low melting point was conducive to the reaction. The leaching residue was a calcium fluoride-rich concentrate. |
| WOS关键词 | EXTRACTION ; BASTNAESITE ; LITHIUM |
| 资助项目 | National Key Research and Development Program of China[2020YFC1909003] ; Research Projects of Ganjiang Innovation Academy ; Chinese Academy of Sciences[E055A002] |
| WOS研究方向 | Science & Technology - Other Topics ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000757921400003 |
| 出版者 | SPRINGER |
| 资助机构 | National Key Research and Development Program of China ; Research Projects of Ganjiang Innovation Academy ; Chinese Academy of Sciences |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/52122]  |
| 专题 | 中国科学院过程工程研究所 |
| 通讯作者 | Li, Huiquan |
| 作者单位 | 1.Chinese Acad Sci, Inst Proc Engn, Natl Engn Res Ctr Green Recycling Strateg Met Res, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Ganjiang Innovat Acad, Ganzhou 341000, Peoples R China 3.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China 4.China Southern Rare Earth Grp CO LTD, Ganzhou 341000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xing, Peng,Li, Huiquan,Ye, Chunlin,et al. Recovery of Rare-Earth Elements from Molten Salt Electrolytic Slag by Fluorine Fixation Roasting and Leaching[J]. JOURNAL OF SUSTAINABLE METALLURGY,2022,8(1):522-531. |
| APA | Xing, Peng,Li, Huiquan,Ye, Chunlin,&Zhong, Liqin.(2022).Recovery of Rare-Earth Elements from Molten Salt Electrolytic Slag by Fluorine Fixation Roasting and Leaching.JOURNAL OF SUSTAINABLE METALLURGY,8(1),522-531. |
| MLA | Xing, Peng,et al."Recovery of Rare-Earth Elements from Molten Salt Electrolytic Slag by Fluorine Fixation Roasting and Leaching".JOURNAL OF SUSTAINABLE METALLURGY 8.1(2022):522-531. |
入库方式： OAI收割
来源：过程工程研究所
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