Preparation method for separating and purifying single heavy rare earth by using full-extraction process

Abstract

The invention relates to a preparation method for purifying heavy rare earth, in particular to a preparation method for separating and purifying the heavy rare earth by using a full-extraction process. The technical scheme adopted by the invention comprises the steps of adopting thulium, ytterbium and lutetium concentrate as a raw material, and carrying out non-rare earth impurity purification by using N235 and then carrying out full-extraction separation and purification by using a double extracting agent system of P507 and C272 so as to respectively obtain high-purity single rare earth products of Tm2O3, Yb2O3 and Lu2O3. Compared with the prior art, the preparation method for separating and purifying the heavy rare earth by using the full-extraction process, provided by the invention, has the following advantages of: strong adaptability to raw material distribution variation of the input and output process parameters specified by the full-extraction separating and purifying process compared with the input and output process parameters in the production of a traditional ion exchanging method, an extraction chromatographic method or a single P507 extraction method have the advantages of, low balancing acid value, less acid and alkali raw material consumption, continuous production, large capacity, low comprehensive production cost, high product purity, stable quality and the like.

Description

technical field [0001] The invention relates to a preparation method for purifying heavy rare earths, in particular to a preparation method for separating and purifying heavy rare earths by a total extraction process. Background technique [0002] In recent years, thulium and ytterbium have emerged in the two fields of optical fiber communication and laser technology, and have developed rapidly. Today, Tm rare earth glass laser materials and up-conversion laser materials. Ytterbium and its compounds can be used in thermal shielding coating materials, magnetostrictive materials, electronic calculator memory element additives, glass fiber flux and optical glass additives, etc. Lutetium is also favored by more and more research units in special alloys, crystal materials, high-efficiency catalysts, superconducting and semiconductor materials. Therefore, it is very important for the separation and purification of heavy rare earth elements such as thulium, ytterbium and lutetium. ...

AI Technical Summary

Problems solved by technology

[0003] At present, in the complete separation process of southern rare earth minerals, heavy rare earth components are produced in groups in the form of thulium, ytterbium and lutetium concentrates, and Yb 2 o 3 The content is very high (up to 85%), and the traditional single extraction agent is used as P 507 Separation process, organic operation capacity is small, separation coefficient is small. Extraction separation requires long extraction tank stages, high tank equilibrium acidity and large consumption of raw materials; at the same time, the raw material Yb 2 o 3 The content is very high (>70%), because it is a system of a large number of main components and a small amount of adjacent main components, the separation factor between the main element and the adjacent impurity elements is greatly reduced, and the separation effect is poor, such as the previous thulium / ytterbium and For the separation of ytterbium / lutetium, a large number of main elements need to increase the number of series by as much as 50, and the amount of organic phase is large, and the concentration of rare earths at the outlet is also reduced. Once the raw material thulium, ytterbium and lutetium components fluctuate, the tank Body production control is very difficult

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