Improved room-temperature-selectivity between Nd and Fe in Nd recovery from Nd-Fe-B magnet
Y. Kataoka, T. Ono, M. Tsubota and 1 more
AIP Advances · 2015
doi:10.1063/1.4935570 (opens in a new tab)
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Abstract
The sustainable society requires the recycling of rare metals. Rare earth Nd is one of rare metals, accompanying huge consumption especially in Nd-Fe-B magnets. Although the wet process using acid is in practical use in the in-plant recycle of sludge, higher selectivity between Nd and Fe at room temperature is desired. We have proposed a pretreatment of corrosion before the dissolution into HCl and the oxalic acid precipitation. The corrosion produces γ-FeOOH and a Nd hydroxide, which have high selectivity for HCl solution at room temperature. Nd can be recovered as Mn2O3-type Nd2O3. The estimated recovery-ratio of Nd reaches to 97%.
Abstract licence: CC BY
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