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Enrichment of Rare Earth from Wasted NdFeB Lotion with the Extraction-Precipitation Method
Industrial & Engineering Chemistry Research ( IF 4.2 ) Pub Date : 2021-09-06 , DOI: 10.1021/acs.iecr.1c02780
Zhao Cao 1 , Yiwen Hu 1, 2 , Shuainan Ni 2, 3, 4 , Zhengguan Liu 2, 3 , Xiang Su 2, 3, 4 , Xiaoqi Sun 2, 3, 4, 5
Affiliation  

Extraction-precipitation is a new type of separation technology. By forming a solid extracting complex in the aqueous phase, the process can realize efficient recovery of rare-earth elements (REEs). Compared with the traditional liquid–liquid extraction and chemical precipitation, its advantage lies in that no organic solvent is used and the extraction-precipitant can be recycled. In this study, two novel extraction-precipitants of 2,2′-((cyclohexane-1,1-diylbis(4,1-phenylene))bis(oxy)) diacetic acid (CPDA) and 2,2′-((oxybis(4,1-phenylene))bis(oxy)) diacetic acid (OPDA) were developed and compared with the REE recovery performance of the other extraction-precipitants, i.e., 2,2′-((propane-2,2-diylbis(4,1-phenylene))bis(oxy)) diacetic acid (PPDA) and 2-(4-(2,4,4-trimethylpentan-2-yl) phenoxy) acetic acid (POAA). The effects of aqueous phase pH value, reaction equilibrium time, saponification degree, extraction-precipitant amount, and the ratio of REE were investigated. The mechanism for the extraction-precipitation process was indicated to be cation exchange. CPDA, OPDA, and PPDA with a dicarboxylic acid structure showed stronger loading capacities and faster precipitation speed for neodymium (Nd) than POAA with a monocarboxylic acid structure. Among these extraction-precipitants, CPDA had the lowest water solubility and therefore could be easily recycled. The extraction-precipitation technology was successfully used to recover REE from the lotion of waste neodymium ferroboron (abbreviated as NdFeB) magnets with a recovery rate of 90%. The concentration of REE was increased from 51.4 mg/L to 19.6 g/L, accordingly, and the enrichment was about 400 times. This study provides new insight into the recycling of REE secondary resources.

中文翻译:

萃取-沉淀法从废钕铁硼乳液中富集稀土

萃取-沉淀是一种新型的分离技术。通过在水相中形成固体萃取复合物,该工艺可以实现稀土元素(REE)的高效回收。与传统的液-液萃取和化学沉淀相比,其优点在于不使用有机溶剂,萃取-沉淀剂可循环使用。在本研究中,2,2'-((环己烷-1,1-二基双(4,1-亚苯基))双(氧基))二乙酸(CPDA)和2,2'-((开发了氧双(4,1-亚苯基))双(氧))二乙酸 (OPDA) 并与其他萃取-沉淀剂,即 2,2'-((丙烷-2,2-二基双(4,1-亚苯基))双(氧基))二乙酸(PPDA)和2-(4-(2,4,4-三甲基戊烷-2-基)苯氧基)乙酸(POAA)。考察了水相pH值、反应平衡时间、皂化度、萃取-沉淀剂用量、REE配比等因素的影响。萃取-沉淀过程的机制被表明是阳离子交换。与具有单羧酸结构的 POAA 相比,具有二羧酸结构的 CPDA、OPDA 和 PPDA 对钕 (Nd) 显示出更强的负载能力和更快的沉淀速度。在这些萃取沉淀剂中,CPDA 的水溶性最低,因此易于回收。提取-沉淀技术成功地从废钕铁硼(简称NdFeB)磁体洗液中回收稀土元素,回收率达90%。REE浓度从51.4mg/L提高到19.6g/L,富集约400倍。
更新日期:2021-09-15
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