制取荧光级氧化铕新的联合工艺

报导了锌还原、P_(204)单级萃取富集稀土料液中的铕,再用萃取包层分离纯制荧光级氧化铕的工艺。通过条件试验,探索到还原,萃取及萃淋的最佳条件,探讨了萃取色层反应机理。经小型试制,各批产品纯度皆>99.98％,回收率皆>97％,工艺简短,设备简单,所耗原料价廉易得,且各项要求均达生产指标。

A New combination Process for Production of Europium Oxide of Fluorescence Grade

In this paper, an attempt is made to explore a new process for the production of high purity europium oxide. The process developed consists of a zinc reduction of europium to divalent state on a zinc column, follow by a single stage solvent extraction to remove major part of the trivalent rare earths, leaving the divalent europium in the raffinate, which is then subjected to extraction chro-matographic separation on a D2EHPA loaded resin column. Without the use of expensive chelating agents, as in the case of classical ion exchange technique, simple elution with dilute hydrochloric acid gives very high purity europium. Chemical analysis indicates that the separation from its neighboring rare earths is sharp enough to warrant its use in the preparation of various fluorescent materials. All trial runs in the laboratory achieved yields above 97 %. Raw materials required are easily available in the market. Its potential for commercial production is quite apparent.