Method for extracting and separating tungsten from aqueous solution containing tungsten

An aqueous solution and extraction technology, applied in the field of materials, can solve problems such as environmental pollution, and achieve the effects of non-toxic and harmless environment, high extraction efficiency and mild operating conditions

Inactive Publication Date: 2018-07-06
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in its pollution to the en

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Mix and stir nonionic surfactant Triton X-100, tungsten-containing aqueous solution, sodium sulfate aqueous solution and deionized water evenly to obtain mixed solution 1, and the mass fraction of nonionic surfactant Triton X-100 in mixed solution 1 is 10%, the mass fraction of tungsten (VI) is 0.1%, the mass fraction of sodium sulfate is 10%, and the pH value of the mixed solution 1 is adjusted to 2 with sulfuric acid to obtain the mixed solution 2;

[0018] (2) Put the mixed solution 2 of step (1) into a constant temperature magnetic stirrer to stir, set the temperature to 30°C, and stir for 60 minutes. After stirring, place it in a constant temperature water bath at 30°C for phase separation. The phase separation time is 20 minutes, and a two-phase aqueous system in which the upper phase is a nonionic surfactant phase loaded with tungsten and the lower phase is an aqueous phase is obtained;

[0019] (3) the nonionic surfactant phase solution of loading tungsten i...

Embodiment 2

[0022] (1) Mix and stir nonionic surfactant Triton X-102, tungsten-containing aqueous solution, lithium sulfate aqueous solution and deionized water to obtain mixed solution 1, and the mass fraction of nonionic surfactant Triton X-102 in mixed solution 1 is 15%, the mass fraction of tungsten (VI) is 5.0%, the mass fraction of lithium sulfate is 8%, and the pH value of the mixed solution 1 is adjusted to 3 with hydrochloric acid to obtain the mixed solution 2;

[0023] (2) Put the mixed solution 2 of step (1) into a constant temperature magnetic stirrer to stir, set the temperature to 40°C, and stir for 30 minutes. After stirring, place it in a constant temperature water bath at 40°C for phase separation. The phase separation time is 40min, and a two-phase aqueous system in which the upper phase is a nonionic surfactant phase loaded with tungsten and the lower phase is an aqueous phase is obtained;

[0024] (3) the nonionic surfactant phase solution of loading tungsten in step ...

Embodiment 3

[0027] (1) Mix and stir nonionic surfactant Triton X-114, tungsten-containing aqueous solution, ammonium sulfate aqueous solution and deionized water evenly to obtain mixed solution 1, and the mass fraction of nonionic surfactant Triton X-114 in mixed solution 1 is 20%, the mass fraction of tungsten (VI) is 2.55%, the mass fraction of ammonium sulfate is 12%, and the pH value of the mixed solution 1 is adjusted to 3 with nitric acid to obtain the mixed solution 2;

[0028] (2) Put the mixed solution 2 of step (1) into a constant temperature magnetic stirrer to stir, set the temperature to 50°C, and stir for 10 minutes. After stirring, place it in a constant temperature water bath at 50°C for phase separation. The phase separation time is 60 minutes, and a two-phase aqueous system in which the upper phase is a nonionic surfactant phase loaded with tungsten and the lower phase is an aqueous phase is obtained;

[0029] (3) the nonionic surfactant phase solution of loading tungste...

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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...

Claims

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Application Information

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IPC IPC(8): C22B34/36C22B3/26
CPCC22B34/36C22B3/26Y02P10/20
Inventor 张永强王萍张帆孙婷婷李攀潘雅静
Owner YANSHAN UNIV
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