Method for preparing high-purity gadolinium through refining and removing aluminum in rare earth gadolinium solution by ionic liquid method

Abstract

The invention relates to a method for preparing high-purity gadolinium through refining and removing aluminum in a rare earth gadolinium solution by an ionic liquid method, and belongs to the field ofextraction separation. The method is characterized in that functional ionic liquid with a specific structure is used as an extraction agent, an organic solvent is a diluent, an organic phase with selective extraction of the aluminum is formed, and efficient aluminum removal of the rare earth gadolinium solution is realized through cascade extraction. The aluminum content of impurity aluminum ina GdCl3 solution after aluminum removal is less than 10 ppm, the rare earth yield is greater than 99.5%, and the impurity content requirement of the high-purity gadolinium (greater than 4N5) is met. Compared with an existing rare earth solution aluminum removal method, the method has the advantages that saponification is not needed, the process is simple, the cost is low, the aluminum removal efficiency is high, and the rare earth loss is low.

Description

【Technical field】

[0001] The invention relates to a method for preparing high-purity gadolinium by refining rare earth gadolinium solution and removing aluminum, in particular to a method for refining rare earth gadolinium and removing aluminum by an ionic liquid method, which belongs to the field of extraction and separation. 【Background technique】

[0002] The rare earth element gadolinium can form a strong magnetic moment due to its multi-unpaired electronic structure. Significant, intrinsic electronic properties, so the higher the purity of gadolinium is required, the better. Generally, the purity is required to be greater than 99.995%. Solvent extraction is commonly used in industry to extract and purify rare earth gadolinium. In the typical rare earth extraction and separation process of P507-HCl system, the coordination ability of aluminum ions and gadolinium and extraction agent P507 is equivalent, resulting in the impurity aluminum in gadolinium products often excee...

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