Method for separating and preparing rare earth yttrium enrichment from marine rare earth sulfuric acid leaching solution

Abstract

The invention discloses a method for separating and preparing rare earth yttrium enrichment from a marine rare earth sulfuric acid leaching solution. The method comprises the following steps that (1) cross-flow extraction is carried out on a first organic phase and the marine rare earth sulfuric acid leaching solution to obtain a primary loaded organic phase and a primary raffinate, and the first organic phase is composed of N235, TBP and sulfonated kerosene; (2) counter-current extraction is carried out on a second organic phase and the primary raffinate obtained in the step (1) to obtain a secondary loaded organic phase and a secondary raffinate, and the second organic phase is composed of Cyanex 272 and sulfonated kerosene; and (3) the secondary loaded organic phase obtained in the step (2) is added into an oxalic acid solution, stirring is carried out, and after complete phase splitting, a lower-layer water phase is taken and filtered to obtain the rare earth yttrium enrichment. According to the method for separating and preparing the rare earth yttrium enrichment from the marine rare earth sulfuric acid leaching solution, rare earth yttrium is efficiently separated and enriched from the marine rare earth sulfuric acid leaching solution, the method is simple and easy to implement, and the content of non-rare earth impurities in the recycled rare earth yttrium enrichment is smaller than 1%.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for separating and preparing rare earth yttrium enrichment from marine rare earth sulfuric acid leaching solution. Background technique [0002] Rare earth elements have rich and unique properties such as magnetism, light, and electricity. They are indispensable or substitute strategic materials for the development of high-tech and cutting-edge defense technologies and the transformation of traditional industries in various countries in the world today. They are also precious non-renewable resources. [0003] my country is the world's largest reserve country of terrestrial rare earth resources. In the past few decades, it has almost assumed the role of rare earth supply in the world. Now countries around the world have begun to search for new rare earth resources, and marine rare earth resources have been discovered and proposed. The emergence of marine rare eart...

AI Technical Summary

Problems solved by technology

Due to the complex composition of marine rare earths and the low grade of rare earth yttrium, the obtained sulfuric acid leaching solution has high acidity, many types of impurity ions and high concentration (especially Fe 3+ ), Y 3+ The typical characteristics such as low concentration greatly increase the technical difficulty of separating and enriching rare earth yttrium, which restricts the recovery and utilization of yttrium in marine rare earths