Improved room-temperature-selectivity between Nd and Fe in Nd recovery from Nd-Fe-B magnet
Source abstract
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%.
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Research context
OpenAlex topics: Extraction and Separation Processes · Geochemistry and Elemental Analysis · Advancements in Battery Materials
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Affiliations
Faculty of Engineering, Fukuoka Institute of Technology 1 Department of Electrical Engineering, , 3-30-1 Wajiro-higashi, Higashi-ku, Fukuoka 811-0295, Japan
Physonit Inc. 2 , 6-10 Minami-Horikawa, Kaita Aki, Hiroshima 736-0044, Japan
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