| 摘要 |
<p>Process for the treatment of ores containing rare earths, consisting in performing a sulphuric digestion of the ore in a reactor 1, then in taking up the digestion mass with an aqueous solution of a calcium nitrate in a reactor 3. After removal of the insolubles in 7, the rare-earth values are recovered by precipitation in the reactor 10 and the filter 12. The aqueous solution purified in respect of rare earths is recycled into the reactor 3 for taking up the digestion mass. <IMAGE></p> |
