Preparation method of high-purity nano neodymium phosphate powder

Abstract

The invention relates to a preparation method of high-purity nano neodymium phosphate powder, which comprises the following steps: (1) adding neodymium carbonate, basic neodymium carbonate, neodymium oxide or neodymium hydroxide into deionized water or deionized water containing a dispersing agent, and stirring the components to obtain a neodymium-containing suspension; (2) preparing a phosphoric acid solution, adding a strong acid solution into the phosphoric acid solution, and adding a dispersing agent; and (3) adding a neodymium-containing suspension into the phosphoric acid solution obtained in the step (2) under a stirring condition, filtering the solution, and washing and drying the precipitate after the constant-temperature reaction is finished, thereby obtaining neodymium phosphate powder. The purity of the high-purity nano neodymium phosphate prepared by the method is greater than 99.995%, the dispersity is good, and the primary particle size of the high-purity nano neodymium phosphate is spherical-like powder of 100nm-500nm.

Description

technical field [0001] The invention relates to a preparation method of high-purity nano neodymium phosphate powder. Background technique [0002] Neodymium is a rare earth element, which is widely used in the fields of magnetic materials, luminescent materials, grinding materials, laser glass materials and catalytic materials. Neodymium phosphate exists in the monazite structure in nature. Due to its unique and excellent properties, neodymium phosphate is widely used in ceramics, luminescence, catalysis and other fields. However, in these application fields, neodymium phosphate is required to have high purity, small particle size and uniform distribution. nature. [0003] Existing methods for preparing high-purity nano-neodymium phosphate powders, such as "A Method for Preparing Rod-shaped Nanocrystals of Neodymium Phosphate Dihydrate" disclosed in the Chinese patent application with the application number CN202010691796.5, use neodymium oxide, deionized Water, glacial ac...

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Problems solved by technology

In the paper "Solid Synthesis of Neodymium Phosphate Nanocrystals" published by Mo Guowei and others, they used neodymium phosphate and ammonium phosphate as raw materials and PEG 400 as a dispersant to synthesize nano-neodymium phosphate crystals in solid phase, which would produce a large amount of nitrogen during calcination Oxygen compounds, serious pollution

[0004] For the synthesis of neodymium phosphate, the main methods are precipitation method, hydrothermal method, and solid-phase method. For the precipitation method, soluble neodymium salt is first reacted with phosphate, and the pH value is adjusted to obtain the precipitation of neodymium phosphate, which will produce waste water and products. Disadvantages such as low purity

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