Holmium oxide separation process

Abstract

The invention provides a holmium oxide separation process which comprises the following steps: carrying out saponification reaction on a mixture of P507 and sulfonated kerosene to obtain an organic load A, and adding the organic load A into a 1# extraction tank; dissolving southern ion ore with acid, adding the dissolved southern ion ore into a 2# extraction tank communicated with a 1# extractiontank for separation and extraction, and respectively leading out an organic load B and an organic load C; washing the organic load B in a 3# extraction tank to obtain medium rare earth and enriched holmium feed liquid containing a small amount of yttrium; introducing into a 4# extraction tank for separation and extraction, and leading out an organic load D; adding the mixture into a 5# extractiontank for separation and extraction to obtain a mixture of yttrium chloride and holmium chloride; adding a light rare earth organic load E into the 6# extraction tank, and introducing a mixture of yttrium chloride and holmium chloride for separation and extraction to respectively obtain enriched substances of pure holmium chloride and yttrium chloride; sequentially subjecting pure holmium chlorideto oxalic acid precipitation, cleaning and firing, and obtaining holmium oxide. The holmium oxide separation process is low in energy consumption, high in efficiency and low in cost.

Description

technical field [0001] The invention relates to the technical field of separation and purification of rare earth oxides, in particular to a holmium oxide separation process. Background technique [0002] Holmium is one of the rare earth elements, which is easily oxidized to form holmium oxide at high temperature. Holmium oxide is the most paramagnetic substance known and can be used as an additive for new magnet materials. With the popularization and popularization of LED technology, the demand for yttrium oxide decreases, while the growth rate of magnetic materials is faster, and the demand for holmium increases. However, the content of holmium in mixed rare earths is as low as about 0.75%, so it is more difficult to separate. [0003] The existing rare earth element separation process generally obtains a group of heavy rare earths (holmium, erbium, thulium, ytterbium, lutetium, and yttrium) mixed rare earths through extraction and grouping. The 5N yttrium oxide and holmiu...

AI Technical Summary

Problems solved by technology

In order to obtain holmium products, it must go through the yttrium oxide extraction line of naphthenic acid system, and then separate holmium / erbium to obtain pure holmium, but this process consumes a lot of acid and alkali, high energy consumption, long purification route, high cost, and low efficiency.

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