Method for extracting and separating tungsten from aqueous solution containing tungsten

Abstract

Provided is a method for extracting and separating tungsten from an aqueous solution containing tungsten. Mainly, a nonionic surface active agent, the aqueous solution containing tungsten, a brine solution and deionized water are mixed and stirred uniformly; the mass fraction of the nonionic surface active agent is 10-20%, the mass fraction of tungsten is 0.1-3%, and the mass friction of salt is 6-12%; the pH value is adjusted to 2-3, after stirring is performed at 30-60 DEG C for 10-60 min, standing and phase splitting are performed, phase separation is performed for 10-60 min, and a dual-water-phase system with the upper phase being a nonionic surface active agent phase loaded with tungsten and the lower phase being a water phase is obtained; the reextraction temperature is 40-70 DEG C,time is 20-60 min, phase separation is performed for 20-60 min, the phase ratio of the nonionic surface active agent phase loaded with tungsten and the ammonium carbonate aqueous solution phase is 1-4: 1, and reextraction products are ammonium tungstate. The method is high in extraction speed and good in phase separation, the tungsten single-stage extraction rate reaches 98% or above, and the tungsten single-stage reextraction rate reaches 97% or above.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a method for extracting tungsten. Background technique [0002] Tungsten is a rare metal with a high melting point. The chemical properties of tungsten are very stable. It does not react with air and water at room temperature. It is insoluble in hydrochloric acid, sulfuric acid, nitric acid and alkaline solutions. Aqua regia can only oxidize the surface, but it is soluble in nitric acid and hydrofluoric acid. A mixture of acids; it can combine with chlorine, bromine, iodine, carbon, nitrogen, sulfur, etc. at high temperature, but not with hydrogen. It is precisely because of these characteristics that tungsten has been widely used in production and life. [0003] At present, the mainstream tungsten smelting process includes alkaline process including soda pressure cooking process and sodium hydroxide decomposition process. In China, it is mainly based on sodium hydroxide decomp...

AI Technical Summary

Problems solved by technology

However, there are still some problems in its pollution to the environment, and the extraction effect needs to be further improved.