Extracting agent for rare earth extraction separation, preparing method thereof and extraction separation method using same

Abstract

The invention discloses an extracting agent for rare earth extraction separation, a preparing method thereof and an extraction separation method using the extracting agent. The extraction separation method comprises the following steps of (1), mixing one or a plurality of diluents in an extracting agent which is represented by a formula (I) and/or a formula (II), and obtaining an organic phase; (2), mixing the organic phase obtained in the step (1) with yttrium-containing rare earth material solution, performing selective extraction for keeping the yttrium in a water phase and making poor-yttrium rare earth enter an organic phase, namely realizing extraction of rare earth yttrium. The extracting agent and the extraction separation method are advantageous in that 1, high selectivity of theextracting agent in rare earth extraction separation is realized, not only is a separation coefficient between light rare earth and yttrium kept, but also a separation range between heavy rare earth and the yttrium is improved; 2, the organic phase of the process can be cycled by more than one year without remarkable concentration reduction; 3, high extraction phenomenon and no emulsification arerealized; and 4, simple synthesis and low cost of the extracting agent are realized.

Description

technical field [0001] The invention belongs to the technical field of rare earth extraction and separation, and relates to an extraction agent for rare earth extraction and separation, a preparation method thereof and an extraction and separation method using the extraction agent, in particular to an extraction agent for extraction and separation of yttrium-containing rare earths, a preparation method thereof and An extraction and separation method for extracting yttrium-containing rare earths by using the extractant. Background technique [0002] As a type of heavy rare earth, yttrium is widely used in rare earth aluminum alloys, functional ceramics, lasers, phosphors and other fields. In the existing technology, the separation of yttrium mainly adopts the extraction and separation method based on naphthenic acid (code name NA). Using naphthenic acid-mixed alcohol-kerosene as the organic phase, high-purity yttrium oxide is prepared from a rare earth mixture with a yttrium...

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Problems solved by technology

Although this extraction method can produce high-purity and high-yield yttrium oxide, there are many shortcomings in the extraction process of naphthenic acid, mainly because it is a by-product of the petroleum industry, its composition is complex, and it is easy to slowly undergo esterification with mixed alcohols. As a result, the extraction capacity is significantly reduced, and it needs to be replaced every few years, which not only wastes resources, but also may pollute the environment and greatly increase economic costs.

Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, designed and synthesized a carboxylic acid type extractant code-named CA12 (Ye Weizhen, Xu Qingren, Qian Yunfang, "Extractant for Separation of Rare Earth Metals" 93112500.6, 1994-03-30); invented by China Patent CN 99118261.8 discloses a process for separating yttrium oxide based on CA12, practice shows that the separation coefficient of CA12 to heavy rare earths (such as Er, Tm, Yb, Lu) and Y is not high enough

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