The hydrolysis of the rare-earth carbides

Svec, Harry J.; Capellen, J.; Saalfeld, F. E.

doi:10.1016/0022-1902(64)80315-8

Cited by 13 publications

(3 citation statements)

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“…After the VIM process, the morphology of the as-cast NdFeBC sat alloy was measured by SEM, as shown in Figure a. The rare earth carbides phase is easily hydrolyzed during the preparation of the samples under normal atmosphere, , and the rare earth hydroxides will fall apart from the sample. Therefore, the dark scallops appeared on the surface of the samples, as marked by green arrow.…”

Section: Resultsmentioning

confidence: 99%

“…Among which, the gases of hydrogen, ethene and ethyne are the dominant component of the hydrolysis gas. Normally, the rare earth (Nd, Pr and La) sesquicarbides and dicarbides may be classified as acetylides; however, they do not yield pure C 2 H 2 . , After about 20 min, the reaction of hydrolysis was coming to an end at the experimental conditions of the ratio of alloy powders to water controlled at 10 g/200 mL. In the hydrolysis process, the alloy particles were smaller than 100 μm.…”

Section: Resultsmentioning

confidence: 99%

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Recovery of Rare Earth Elements from NdFeB Magnet by VIM-HMS Method

Bian

Guo

Jiang

et al. 2016

ACS Sustainable Chem. Eng.

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A novel method to recover rare earth elements (REEs) from NdFeB magnets was developed. This method involves three basic steps, i.e., the vacuum induction melting (VIM) process, the hydrolysis process and the magnetic separation process (HMS). In the VIM process, the NdFeB magnets were melted in a graphite crucible under vacuum (<1 Pa), in which way the rare earth carbides formed by the reaction of REEs and carbon, and the carbon saturated NdFeBCsat alloy was obtained. On the basis of the hydrolysis of rare earth carbides, the REEs were separated from the NdFeBCsat alloy by the reaction of the rare earth carbides phase with water. Thus, the rare earth hydroxides and iron-based metal residues were produced. Magnetic separation was further used to remove the iron residues from the rare earth hydroxides. Through this method, the optimal recovery ratio reached 93%, and the purity of the rare earth hydroxides was as high as 99.7%. Along with the VIM-HMS process, the investigation of NdFeBCsat alloy, the morphology of the rare earth hydroxides and the conversion of rare earth hydroxides to rare earth oxides are also presented in this paper. In this research, the X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), inductive-coupled plasma spectroscopy (ICP), mass spectrum analyses, CS analyses, magnetic properties analyses and nitrogen physisorption analyses were applied.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Recovery of Rare Earth Elements from NdFeB Magnet by VIM-HMS Method

Bian

Guo

Jiang

et al. 2016

ACS Sustainable Chem. Eng.

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show abstract

“…(I963) andSvec ejfc al. (1964) report the appearance of 1-butene, 1,2-butadiene, and 2-butyne among the reaction products of the hydrolysis reactions Svec et al (1964). hydrolyzed the rare earth sesquicarbides with 1.0 N HCl.…”

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confidence: 99%