| abstract |
Metals are recovered from spent solid oxide fuel cells. A first step 11 for pulverizing a used cell, a second step 12 for mixing a fine powder of the first step 11 and water, and producing a slurry having a pulp concentration of 10 to 20% by mass; The third step 13 in which acid is added to the slurry prepared in the second step 12 to adjust the pH to 2 to 4 , and the slurry adjusted in pH in the third step 13 has a concentration of 1 to 2.2 × 10 −4 mol / l. A fourth step 14 for adding the agent, a fifth step 15 for causing the slurry of the fourth step 14 to foam, attaching the first metal fine particles to the foam, and precipitating the remaining second metal fine particles, and a fifth step 15 Filter the precipitate of the second metal fine particles obtained in step 6 to obtain the precipitate, and wash and dry the precipitate obtained in the sixth step 16a to obtain La, Sr, Ga, Mg, Co Obtained in the seventh step 16b and the seventh step 16b to obtain a solid material mainly composed of The solid comprises an eighth step 17 to ground to a fine powder. [Selection] Figure 1 |