从荧光粉废料中提取稀土工艺研究

Technical Study on Rare Earth Recovery from Fluorescent Powder Scrap

采用4种方案从荧光粉废料中提取稀土元素,并考查了盐酸法提取稀土时盐酸和双氧水用量对稀土浸出率的影响,随后采用碳酸钠焙烧法提取渣中较难浸出的铈、铽,最后采用中和法对酸浸出液进行除杂。结果表明,100g物料盐酸最佳用量为150mL,双氧水用量为20mL,钇、铕浸出率可达99%。经碳酸钠焙烧—盐酸浸出后铽浸出率达到55%,除杂后铁、硅、铝含量分别降至11.47mg/L、15.93mg/L和150mg/L。

Rare earths （RE） were recovered from fluorescent powder scrap with four schemes, the effects ot hydrochloric acid and hydrogen peroxide dosage on the leaching rate of RE were studied. Then Ce and Tb was extracted from waste residue with sodium carbonate roasting process, at last the leaching solution was edulcorated with neutralization process. The results show that the leaching rate of Y and Eu can reach 99% with the optimum dosage of hydrochloric acid of 150 mL and hydrogen peroxide of 20 mL for 100 g materials. The leaching rate of Tb can reach 55% after sodium carbonate roasting; Fe, Si and A1 are re-duced to 11.47 mg/L, 15.93 mg/L and 0. 15 g/L after edulcorating.