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| 1 | Recovery of neodymium,dysprosium,and cobalt from NdFeB magnet leachate using an unsymmetrical dialkylphosphinic acid extractant,INET-3显示文摘Rare earths (REs) and Co are critical strategic resources.Their recovery is crucial for ensuring that their supplies are adequate and for reducing environmental pollution.End-of-life NdFeB magnets are important secondary RE sources.The separation of Dy,Nd,and Co from NdFeB leachate using a relatively new extractant (2,3-dimethylbutyl)(2,4,4’-trimethylpentyl)phosphinic acid (INET-3),was investigated in this study.The separation parameters,such as equilibrium pH,phase ratio,INET-3 concentration,and number of counter-current extraction stages,were optimised.The results show that INET-3 can separate Dy,Nd,and Co efficiently.For the preferential extraction of Dy from synthetic iron-free NdFeB leachate,the optimum equilibrium pH is 2.60.Under this condition,separation of Dy from the leachate requires four counter-current extraction stages at A/O (volume ratio of aqueous to organic)=1:2.This is demonstrated by a simulated four-stage counter-current extraction process.At equilibrium pH=2.52and A/O=1:2,98%of Dy is recovered with 95%purity.As to the subsequent separation of Nd from the leachate,nearly 100%is recovered with 99%purity through a simulated three-stage counter-current extraction process at equilibrium pH=5.33 and A/O=1:1.Approximately 95%of Co remains in the raffinate with 99.98%purity. | Zhengyu Liu a Jiaming Wu a Xinyu Liu Wen Wanga Ziwei Li Ruijing Xu Yue Ding Junlian Wang | 2020 | Journal of Rare Earths2020，38，10： | 3 |
| 2 | HDDR各向异性钕铁硼磁粉研究及应用进展显示文摘吸氢-歧化-脱氢-再复合工艺(HDDR)是生产各向异性钕铁硼磁粉的有效方法,其制备的各向异性粘结磁体性能高,重量轻,在提高微特电机功效、减轻重量等方面发挥着重要作用,目前在汽车、无人机等领域已产业化应用。为了提高磁粉性能,科研人员仍不断探究HDDR工艺与各向异性机理,采用晶界扩散法优化磁粉晶界结构,提高磁粉矫顽力与温度稳定性,同时将上述成果应用到废旧烧结钕铁硼回收中,节约稀土资源。HDDR各向异性磁粉性能显著高于各向同性磁粉的,但形变塑性次之,研究者试图将其作为热变形磁体前驱原材料,进一步提升热变形磁体性能。HDDR工艺细化晶粒的效果为提高烧结钕铁硼矫顽力提供了一条新的研究途径,但目前还未获得理想的成果。本研究主要介绍近年来HDDR工艺与机理的发展以及其在稀土磁体回收、热变形磁体、烧结磁体等方面的应用情况。 | 杨俊 黄东亚 王岳 莫漫漫 林百春 杨澍 | 2023 | 材料开发与应用2023，38，2： | 1 |
| 3 | One-step separation and recovery of rare earth and iron from NdFeB slurry via phosphoric acid leaching显示文摘The recovery of rare earth elements(REEs)from NdFeB slurry by traditional hydrometallurgy has been limited becuase a large number of REEs are lost during separation together with iron.In this paper,a simple and sustainable method is proposed to efficiently separate and recover REEs and iron from NdFeB slurry.REEs were recovered by one-step selective precipitation in phosphoric acid,and the dissolved iron was recovered by oxalic acid.Phosphoric acid leaching results show that under the conditions of 4 mol/L phosphoric acid,80℃,L/S of 30:1 and 90 min,the leaching efficiencies of Fe and REEs reach 98.76%and1.09%,respectively.While the rest of REEs remained in the leaching residue in the form of REEPO_(4)·nH_(2)O precipitation.Subsequently.the mixed rare earth oxide(rare earth oxalate roasted at 800℃)and FeC_(2)O_(4)·2 H_(2)O are obtained by oxalic acid precipitation with purities of 99.49%and 97.17%from the REEPO4·nH_(2)O dissolving solution and the phosphoric acid leaching solution.Moreover,the phosphoric acid is regenerated while recovering iron,and it can be reused in the phosphoric acid leaching step after removing the impurity C_(2)O_(4)^(2-).In summary,this work provides an efficient and environmentally friendly method for recovering REEs and iron from NdFeB slurry waste. | Ling He Qipeng Xu Wensheng Li Qizheng Dong Weimin Sun | 2022 | Journal of Rare Earths2022，40，2： | 0 |
| 4 | Magnetic property recovery in Nd-Fe-B bonded magnet wastes with chemical reaction and physical dissolution显示文摘The main difficulty for the recovery of Nd-Fe-B bonded magnet wastes is how to completely remove the epoxy resins.In this study,chemical reaction and physical dissolution were combined to remove the epoxy resins by adding ammonia-water and mixed organic solvents.Ammonia-water can react with the epoxy functional group of epoxy resin to generate polyols.Mixed organic solvents of alcohol,dimethyl formamide(DMF),and tetrahydrofuran(THF) can dissolve the generated polyols and residual epoxy resins.Under the optimum processing conditions,the epoxy resins in the waste magnetic powders are substantially removed.The oxygen and carbon contents in the recycled magnetic powder are reduced from 13500 × 10^(-6) to 1600 × 10^(-6) and from 19500 × 10^(-6) to 2100 × 10^(-6) with the reduction ratio of88.1% and 89.2%,respectively.The recycled magnetic powder presents improved magnetic properties with MS of 1.306 × 10^(-1) A·m^(2)/g,Mr of 0.926 × 10^(-1) A·m^(2)/g,Hcj of 1.170 T,and(BH)max of 125.732 kJ/m^(3),which reach 99.8%,99.4%,95.9%,and 96.9% of the original magnetic powders,respectively. | Min Liu Haiyuan Cui Qingyan Li Peihong Zhu Weiqiang Liu Qingmei Lu Dongtao Zhang Zaisheng Pang Xi Yu Chunhui Yu Shanshun Zha Youhao Liu Xiaofei Yi Ming Yue | 2021 | Journal of Rare Earths2021，39，11： | 0 |
| 5 | Electronic and magnetic stability in correlated transportations of rare-earth nickelate perovskites显示文摘Although the thermistor and metal to insulator transition bi-functionalities were discovered for rareearth nickelates(RENiO3),the electronic stability in their correlated transports under impulse voltage or magnetic field remain as open questions.Herein,we demonstrate the thermistor transportations of the electron correlated rare-earth nickelates under impulse direct current voltage and in magnetic environment.The insulating phase of RENiO3 shows zero crossing linear I-V characters,indicating their stable electronic resistance is independent of the imparted voltage up to 10 V and pulse width down to1 us,in spite of their sensitive electronic structures to polarizations.In addition,the high electronic stability associated with the thermistor transportation of RENiO3 is also demonstrated in magnetic fields up to 9 T(i.e.,MR<0.2%).The high electronic stability further paves the way to applying RENiO3 as a broad temperature range thermistor in temperature sensing or circuit protections for correlated electronics. | Jinhao Chen Jikun Chen Zengyao Ren Dandan Zhao Mengxi Wang Jun Miao Xiaoguang Xu Yong Jiang Nuofu Chen | 2021 | Journal of Rare Earths2021，39，2： | 0 |
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