Tungsten extraction process and application thereof

An extraction process and tungsten ore technology, which is applied in the field of non-ferrous metal extraction, can solve the problems of ammonia nitrogen wastewater discharge, environmental pollution, and low value, and achieve high economic value, high dissolution extraction rate, and scientific and reasonable design.

Active Publication Date: 2021-11-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 ammonia nitrogen wastewater, causing environmental pollution; moreover, only metallurgical products of tungsten can be produced, with low value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The embodiment of the present invention provides a tungsten extraction process, which specifically includes the following steps:

[0038] S1. Mix the sodium metatungstate solution with a concentration of 200g / L and a pH of 2.8 (a tungstate solution with a pH value between 1-4 is also called a metatungstate solution) and powdered artificial scheelite (trioxide The tungsten content is 72wt%) mixed and stirred according to the liquid-solid ratio of 5mL: 1g, and the reaction temperature is controlled at 90°C for 2 hours;

[0039] S2, after the reaction is completed, the solid-liquid separation, the calcium metatungstate filtrate that obtains tungsten trioxide concentration is 340.8g / L and the filter residue that tungsten trioxide content is 0.48wt%;

[0040] S3. Adsorb the calcium metatungstate filtrate obtained in step S2 with commercially available 732 resin to obtain the ion-exchanged metatungstic acid solution, then separate the metatungstic acid solution by 60%, dilute...

Embodiment 2

[0043] The embodiment of the present invention provides a tungsten extraction process, which specifically includes the following steps:

[0044] S1. Mix and stir the potassium tungstate solution with a concentration of 150g / L and a pH of 5.5 and powdered scheelite (with a tungsten trioxide content of 50wt%) at a liquid-solid ratio of 8mL: 1g, and control the reaction temperature to 185 ℃, reaction 0.5h;

[0045] S2, after completion of the reaction, solid-liquid separation, the calcium paratungstate filtrate that obtains tungsten trioxide concentration and the filter residue that tungsten trioxide content is 0.72wt% are 212g / L;

[0046] S3, the calcium paratungstate filtrate obtained in step S2 is extracted with commercially available P204 extractant, obtains the metatungstic acid solution after extraction, then separates 60% of the metatungstic acid solution, dilutes to 150g / L and adjusts the pH to 5.5, return to step S1 to react with scheelite, the remaining 40% metatungsti...

Embodiment 3

[0049] The embodiment of the present invention provides a tungsten extraction process, which specifically includes the following steps:

[0050] S1. Mix and stir the ammonium metatungstate solution with a concentration of 250g / L and a pH of 3.5 and powdered artificial wolframite (tungsten trioxide content is 68wt%) at a liquid-solid ratio of 3mL: 1g, and control the reaction temperature 120°C, react for 0.5h;

[0051] S2, after completion of the reaction, solid-liquid separation, the calcium metatungstate filtrate that obtains tungsten trioxide concentration is 485.2g / L and the filter residue that tungsten trioxide content is 0.35wt%;

[0052] S3, the calcium metatungstate filtrate obtained in step S2 is extracted with commercially available P507 extractant, obtains the metatungstic acid solution after extraction, then separates 60% of the metatungstic acid solution, dilutes to 250g / L and adjusts the pH to 3.5, return to step S1 to react with scheelite, and the remaining 40% ...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/36C22B3/06C22B3/24C22B3/26
CPCC22B34/36C22B3/06C22B3/24Y02P10/20
Inventor 陈星宇赵中伟刘旭恒王鸿刘朋远李江涛何利华孙丰龙
Owner CENT SOUTH UNIV
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