METHOD FOR RECOVERING RARE-EARTH FROM FLUORESCENT POWDER OF CATHODE RAY TUBE

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Provided is a method for recovering rare-earth from the fluorescent powder of a cathode ray tube, comprising the following steps : (1) taking the fluorescent powder of the cathode ray tube, adding dilute sulfuric acid having a concentration of 5-15% to dissolve the fluorescent powder, stirring for 0.5-2 hours under the temperature of 85-90℃, and suction-filtrating to obtain a filtrate containing rare-earth ions; (2) adding a hydrofluoric acid solution into the filtrate containing rare-earth ions, reacting to generate a rare-earth fluoride, suction-filtrating to separate the filtrate, leaving the rare-earth fluoride in a filter cake, and washing the filter cake for 1-5 times to obtain a filter cake containing pure rare-earth fluoride. The present invention can effectively recover rare-earth resources from wastes, is reasonable and feasible, environmentally friendly and capable of being industrialized, thereby having higher economic benefit and social benefit.