Preparation method of large-particle neodymium oxalate

Abstract

The invention relates to a preparation method of large-particle neodymium oxalate, belonging to the process of powdery materials. The preparation method comprises the following steps: adding an oxalic acid solution serving as a precipitator into neodymium chloride reverse extraction raffinate containing a trace organic phase, adding seed crystals to generate a neodymium oxalate precipitate, aging, washing, filtering and drying to finally obtain neodymium oxalate particles with a central particle size D50 of 55-200mu m, wherein the particle sizes of the neodymium oxalate particles are in normal distribution. The preparation method disclosed by the invention is simple in process and can be put into industrial production easily; the obtained neodymium oxalate can be further used for preparing neodymium oxide with a central particle size D50 of 25-95mu m and uniform particle distribution.

Description

technical field [0001] The invention belongs to the preparation process of powder materials, in particular to a preparation method of large-grain neodymium oxalate whose particle size is normally distributed. Background technique [0002] Neodymium oxide is widely used in the fields of glass, ceramics and magnetic materials, and is an important raw material for the manufacture of metallic neodymium and strong magnetic NdFeB. With the continuous development of science and technology, rare earth oxides with large particle size and uniform particle distribution have attracted more and more attention, and have good market prospects. For example, in the preparation of neodymium metal, in order to reduce the fine particle dust in the workshop and increase the electrolysis yield, it is generally required that the particle size of neodymium oxide reaches 50 μm and the particle distribution is uniform. In the glass industry, in order to increase the refractive index, reduce scatteri...

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Problems solved by technology

[0004] It can be seen that some patents use ammonium bicarbonate as a precipitant, which makes it difficult to filter rare earth precipitates, and the particle size of the prepared oxides cannot meet the current industrial needs

Some preparation methods also need to add ammonium chloride, resulting in a large amount of ammonia nitrogen wastewater, polluting the environment and increasing production costs

There is no document or patent report on the method of preparing large-grain neodymium oxalate by using a trace amount of organic phase neodymium chloride strip raffinate as raw material, oxalic acid as precipitant, and adding neodymium oxalate seed crystals

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