METHOD FOR RECOVERING RARE EARTH FROM WASTE RARE-EARTH-CONTAINING LIGHT-EMITTING MATERIAL

文件类型：PDF文档
文件大小：1594K
A method for separating and recovering rare earth from a waste rare-earth-containing light-emitting material comprises the following process steps : collecting of a waste rare-earth-containing light-emitting material, comprising quick identification and dismantling and breaking of rare-earth containing fluorescent lamps, breaking of CRT displays, separating of the waste rare-earth-containing light-emitting material from glass substrates and collecting of same; pretreatment of the waste rare-earth-containing light-emitting material, comprising removal of mercury, oxidation, precipitation, alkali-based fusion, and acidolysis; extraction-based separation of the rare earth elements to obtain a rare earth chloride concentrate; extraction-based purification of the rare earth elements to obtain highly pure rare earth chlorides; precipitation-based separation of the rare earth elements to obtain a precipitate of rare earth oxalate or rare earth carbonate; baking of the precipitate of rare earth oxalate or rare earth carbonate to obtain highly pure rare earth oxides. The method separates the rare earth elements Ce, Eu, Tb and Y from impurity elements such as Mg, Ba, and Ca, completely separates and recovers light, medium, and heavy rare earth elements, and obtains highly pure rare earth oxides through purification, so as to comprehensively recover and use resources. The process is reasonable, economical, and practical, the recovery rate of the rare earth is high, and the product has a high added value.