| 简介 |
Provided is a rare earth element recovery method in which rare earth elements, particularly including Nd and Dy, are efficiently leached from a leaching raw material containing rare earth elements, and then separated and recovered. A rare earth element recovery method comprising : a leaching step in which an acidic slurry, which is a leaching raw material containing raw earth elements, is maintained under prescribed conditions and subjected to a rare earth element leaching process, then subjected to solid-liquid separation, and a leached solution containing rare earth elements is obtained; and a separation step in which rare earth elements are separated and recovered from the leached solution obtained. Therein : the leaching raw material contains, in the solid components (S) thereof, 4-15 mass% Ca in the form of CaO, and 2-13 mass% Ti in the form of TiO2; an acid solution is an acid solution of hydrochloric acid and/or nitric acid; the leaching process carried out during the leaching step is a warm extraction carried out under heat and pressure conditions of 160-300°C and 0.65-10MPa, and rare earth elements are leached together with Ca in said leaching step. |
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