A method for preparing ultra-high-purity rare earth oxides by ion exchange at room temperature and high pressure

Abstract

The invention relates to a method for preparing ultra-high-purity rare earth oxides by normal temperature and high pressure ion exchange. Steps such as the second separation of ions are characterized in that a pressure of 5-40 Mpa is applied during the rare earth ion adsorption, washing, and separation processes, and the effluent containing rare earth ions obtained by ion exchange is precipitated with a saturated oxalic acid solution to obtain a rare earth oxalate precipitate. Washing, drying and burning to obtain ultra-high purity rare earth oxides with a purity of 99.9999‑99.99999%. The invention overcomes the problems of long period, low yield, high cost and relatively low purity of the traditional normal temperature and normal pressure ion exchange method, and the non-rare earth impurities are less than 100 PPM, wherein Fe<1ppm, Ca<3ppm, Si<3ppm, the product quality Very good, with good production efficiency.

Description

technical field [0001] The invention belongs to the technical field of rare earth material preparation, and in particular relates to a method for preparing ultrahigh-purity rare earth oxides by ion exchange at normal temperature and high pressure. Background technique [0002] my country is a country rich in rare earth resources, and its output ranks first in the world. Rare earth elements have excellent physical, chemical, magnetic, optical and electrical properties due to their special material structure, and have a wide range of uses. They are called strategic elements in the 21st century. With people's continuous research and understanding of the properties and applications of rare earth elements and the advantages of rich rare earth resources and low prices in my country, rare earths are being used in household appliances, daily chemicals, iron and steel metallurgy, petrochemicals, laser technology, superconducting materials, medical treatment, etc. It has been widely u...

AI Technical Summary

Problems solved by technology

However, the ion exchange method under normal temperature and pressure has the disadvantages of long cycle and low yield, which leads to low production efficiency and high cost of rare earths.