中钇富镧稀土物料处理流程的选择

将一摩尔物质穿过液—液界面所需的能量对各种金属来说大体上是一个常数。选择设计的流程做到了萃取过程在相间传递的物质摩尔数尽可能减少。对中钇（含Ｙ２Ｏ３２０～４０％）富镧（含Ｌａ２Ｏ３２０～４０％）稀土物料，采用环烷酸进行镧钇和其它稀土的切割分离，再用Ｐ＿（５０７）分离镧钇，其它稀土用Ｐ＿（５０７）分组，后续的单一稀土分离流程可以方便地衔接。不仅流程简捷，技术先进，经济上也最为节省。

Selection of the Flowsheet for Extracting Rare Earth

The consumed power is nearly a constant for any element per mole,when it passesthrough the interface in liquid-liquid solvent extraction. If the mole number to be transfered fromone phase to other phase can be reduced to the minimum,the solvent extraction processes de-signed will be better in economy. A process designed fOr extracting rare earth was optimized in both technique and economy.Itfollows that yttrium and lanthanum are separated from other rare earth first by naphthenic acid(HA).And then the yttrium extracted from lanthanum with EHEHPA( P_(507)),a orgnophosphorousacid.Other RE removed La and Y are divided into several groups,then separated into individualones with P_(507).