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预分离萃取法是首先用少量级数对待分离的原料进行预先分离,然后再流入级数较多的、进行相邻元素间分离的细分离工艺,从而减少进入级数较多的相邻元素分离工艺的料液量。因而,整体工艺的萃取槽体积减少25%～40%,有机相、水相及稀土金属的存槽量减少25%～40%,酸碱消耗也减少30%～40%,废水排放量大为减少。预分离工艺有多种形式,相邻元素间的细分离工艺也有多种类型。本文介绍了预分离萃取法的形成缘由、基本原理,使用这种方法的基本原则和它的各种工艺形式,以及用预分离萃取法分离低钇离子稀土矿的新工艺。
Pre-separation extraction is the first step with a small number of raw materials to be separated pre-separation, and then flow into the more series, the separation of adjacent elements of the fine separation process, thereby reducing the entry of more adjacent elements separation Process liquid volume. Therefore, the whole process of extraction tank volume reduced by 25% to 40%, organic phase, water phase and rare earth metal storage tank capacity decreased by 25% to 40%, acid-base consumption also reduced by 30% to 40%, wastewater discharge was cut back. Pre-separation process has many forms, there are many types of fine separation process between adjacent elements. This paper introduces the formation of pre-separation extraction reason, the basic principle, the basic principles of using this method and its various process forms, as well as the use of pre-separation extraction of low-yttrium rare earth ore new technology.