| 简介 |
Solution : One or more mineral acid compounds selected from the group consisting of powdered or particulate magnet alloys and mineral acids and iron mineral acids are mixed into a wet clay or muddy hydrous mixture with a moisture content of 40% by mass or less, and a clay or muddy water-containing mixture is contacted with a gas containing air or oxygen, dilute rare earth elements and iron, and disperse the reaction product in water with mineral acid, An acidic slurry is produced, the acid slurry is solid-liquid separated, an aqueous solution containing rare earth elements is recovered, iron is separated from a magnet alloy containing rare earth elements and iron, and rare earth elements are recovered. [Effect]By efficiently hydroxideing rare earth elements and iron in the magnet alloy using inexpensive mineral acids and iron mineral acid salts from residual powder (scrap) generated at the time of the production of rare earth magnets and magnet scrap, and treating them with mineral acids, rare earth elements can be separated into the aqueous solution side and iron to the solid side, and rare earth elements can be recovered in a method excellent in economy and safety. [Selection figure]None |
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