Process for the recovery of rare earths from rare earth-containing phosphors

摘要

A process for the recovery of rare earths from rare earth-containing phosphors with the following process steps: a) adding solid ammonium chloride in a 1 to 2 times mass ratio, based on the amount of chlorinatable metals, to the rare earth-containing phosphors, b) chlorinating the chlorinatable metals to metal chlorides in a rotary kiln or a sublimation plant at a temperature of 250-350 ° C in a period of 1 to 5 hc) adding an acidic solution to the metal chlorides to a pH of 1 to 4.5, wherein solid constituents are suspended in a solution, the metal chlorides dissolving, d) separating the solid constituents from the solution, e) adding an acid to the separated solid constituents to a pH of less than 1, solid components in suspension f) separation of the solid components from the suspension, g) addition of a precipitant to the separated solution and the abgeget ran liquid, precipitating a rare earth-containing precipitate, h) separating the rare earth-containing precipitate.