Tungsten extraction process and application thereof

Abstract

The invention discloses a tungsten extraction process and application thereof. The tungsten extraction process comprises the following steps: mixing a tungsten ore raw material with a tungstate solution under an acidic condition, carrying out heating reaction to dissolve out tungsten, then carrying out solid-liquid separation, and carrying out post-treatment on the filtrate to obtain a tungsten product, wherein the post-treatment at least comprises the following steps: adsorbing cations in the filtrate by adopting cation exchange resin or an extracting agent to obtain a metatungstic acid solution, and then drying or pyrolyzing the metatungstic acid solution to obtain a tungsten elementary substance and / or tungsten oxide product. Tungsten in the tungsten ore raw material is directly and efficiently dissolved out by utilizing the strong self-coordination capability of tungstate ions under the acidic condition, and the dissolution extraction rate is high; and the extraction process flow is more simplified, and the economic value of the obtained tungsten product is higher; and the extraction process is scientific and reasonable in design, high in process controllability, good in economical efficiency and environmental protection property and wide in practical application prospect.

Description

technical field

[0001] The invention belongs to the technical field of extraction of nonferrous metals, and more specifically relates to a tungsten extraction process and its application. Background technique

[0002] As a strategic rare metal, tungsten is widely used in various industries; tungsten is mainly extracted from wolframite or scheelite.

[0003] The current mainstream tungsten smelting technology is to use alkali to cook tungsten ore or tungsten-containing raw materials to obtain crude sodium tungstate solution, then use ion exchange or solvent extraction to transform it into ammonium tungstate solution, and then obtain ammonium paratungstate through evaporation and crystallization; The above process can process various types of tungsten raw materials and has strong adaptability.

[0004] However, in order to prepare qualified tungsten products, the above process requires the use of ammonium (ammonia) reagents, resulting in the discharge of a large amount of amm...