Method of preparing high-purity cesium carbonate and high-purity rubidium carbonate

Abstract

The invention relates to a method of preparing high-purity cesium carbonate and high-purity rubidium carbonate. According to the content of rubidium and cesium in mixed alum, almost potassium in alum is removed by a recrystallizing method, so that the mixed alum meets the index which is appropriate for extraction separation and is then extracted and separated. By fully utilizing the advantages of recrystallization and extraction separation, overcoming the defects and organically combining the two, the high-purity cesium carbonate and high-purity rubidium carbonate are prepared by the most efficient and economical method. The method of recrystallizing and extracting provided by the invention can be used for preparing high-purity cesium carbonate and high-purity rubidium carbonate in high price by using low price mixed alum as a raw material, so that the cost is saved and the resources are protected.

Description

technical field

[0001] The invention relates to a method for preparing high-purity cesium carbonate and high-purity rubidium carbonate by using mixed alum containing cesium and rubidium as raw materials. Background technique

[0002] When lepidolite is treated with sulfuric acid, a by-product of mixed alum containing rubidium, cesium and potassium can be obtained. At present, there is no report in China to prepare high-purity cesium carbonate and high-purity rubidium carbonate from this mixed alum. Domestic manufacturers of lithium salts using lepidolite as raw materials often ignore the extraction of rubidium and cesium salts while extracting lithium, and the obtained by-products containing rubidium and cesium are often sold at low prices, resulting in a waste of resources. The invention adopts the method of recrystallization and extraction, and uses low-priced mixed alum as raw materials to prepare high-priced high-purity cesium carbonate and high-purity rubidium carbonat...