Process for preparing superfine, high-purity praseodymium oxide by using Pr-Nd riched materials

Abstract

The invention relates to a method to make praseodymium oxide that includes the following steps: mixing raw material, taking ultrasonic fractional extraction to gain enriched liquid containing Pr(NO3)3, taking ultrasonic to gain refined liquid of Pr(NO3)3, taking adsorption and trash extraction, taking solid-liquid separation, taking ultrasonic crystal deposition to gain Pr2(CO3)3 crystal deposit, taking solid-liquid separation, drying and burning to gain the superfine high purity praseodymium oxide product that has content over 99.99%, and the particle diameter is 0.01-10.0um. The advantages of the invention are that it improves leaching and extracting speed, and the particle diameter is small, and particle size distribution equal.

Description

technical field [0001] The invention relates to a method for preparing praseodymium oxide, in particular to a method for preparing ultrafine high-purity praseodymium oxide by using praseodymium-neodymium Pr-Nd enrichment as a raw material, belonging to the field of hydrometallurgy. Background technique [0002] Ultra-fine high-purity praseodymium oxide (Pr 6 o 11 ) products refer to praseodymium oxide products with a praseodymia content of ≥99.99% and a particle size of ≤10.0 μm. Ultra-fine high-purity praseodymium oxide is used in pigments, optical filters, magnets and other materials, and is expanding to other fields, especially in intelligence devices, such as computers, mobile phones, etc., and the rare earths required for magnets, capacitors, etc. The quantity and purity requirements of oxides are also constantly increasing. Ultra-fine high-purity praseodymium oxide can meet the requirements of high-grade products and is an important light rare earth oxide product, wh...

AI Technical Summary

Problems solved by technology

The main problems existing in these separation and preparation methods at present are: (1), extraction and separation rate and efficiency are low: the equipment used in the extraction and separation method at present is mixing and settling tank, centrifugal extractor equipment etc., rare earth extraction rate and separation efficiency are low, extraction time long, which leads to an increase in production costs, and it is difficult to increase production capacity

Improving the extraction and separation speed and separation efficiency of rare earth has been a problem that has been difficult to solve for a long time in the extraction and separation process of praseodymium-neodymium fractionation, and it is also an urgent problem to be solved; Adding oxalic acid as a precipitating agent to generate praseodymium oxalate crystals and precipitation is the crystallization and precipitation method of rare earth elements commonly used in industrial production

Oxalic acid is used as a precipitant, the production cost is high, and oxalic acid is highly toxic and pollutes the environment

It is difficult for the rare earth element praseodymium to form crystalline carbonate. Usually, the prepared praseodymium carbonate is an amorphous flocculent precipitate with a large volume, which contains a large amount of water and impurities. It is difficult to wash and filter, and the product quality is poor and the loss of rare earth is large. , production is difficult

(3), poor product quality: the praseodymium oxalate product obtained by the traditional crystallization precipitation method commonly used at present, the quality of the praseodymium oxide product prepared through solid-liquid separation, drying, and burning is unstable, and it is generally difficult to obtain Pr 6 o 11 The content is as high as 99.99% purity, especially the particle size of the product is large, and the particle size distribution is uneven, it is difficult to meet the requirements of the product used in the high-tech field

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