COMBINATION WASTE LIGHT EMITTING DIODE PACKAGING MATERIAL PYROLYSIS TREATMENT AND METHOD OF RECOVERY

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A combination waste light emitting diode packaging material pyrolysis treatment and a method of recovery of rare earth elements from phosphor powder. On the basis of the pyrolysis characteristics of organic macromolecular compounds, pyrolysis of organic macromolecular material in a light emitting diode is catalyzed, and carbon in the pyrolysis residue is converted into water gas, thus achieving efficient disassembly of the light-emitting diode, solving the problems in traditional mechanical disassembly methods that light emitting diode components are intermixed, and rare earth elements in phosphor powders are difficult to recover. Meanwhile, on the basis of the mechanism of chemical dissolution of the phosphor powder, joint alkali fusion-acid leaching processing is used to efficiently recover rare earth elements in light emitting diode phosphor powders, thus being able to achieve graded leaching of rare earth elements from light emitting diode phosphor powders, precipitate and recover rare earth oxalates, and greatly reduce the difficulty of subsequent separation and purification.