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Method for extracting and separating tungsten from tungsten-containing aqueous solution through aqueous two-phase system

A two-phase system and aqueous solution technology, applied in the field of materials, can solve problems such as environmental pollution, and achieve the effects of non-toxic and harmless environment, wide concentration range and high extraction efficiency

Inactive Publication Date: 2018-06-29
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 environment, and the extraction effect needs to be further improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Mix and stir nonionic surfactant Tween 80, tungsten-containing aqueous solution, sodium sulfate aqueous solution and deionized water evenly to obtain mixed solution 1, and the mass fraction of nonionic surfactant Tween 80 in mixed solution 1 is 10% , the mass fraction of tungsten is 0.1%, the mass fraction of sodium sulfate is 10%, the pH value of the mixed solution 1 is adjusted to 2 with sulfuric acid, and the mixed solution 2 is obtained;

[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 in step (2...

Embodiment 2

[0022] (1) Mix and stir nonionic surfactant Tween 60, tungsten-containing aqueous solution, lithium sulfate aqueous solution and deionized water evenly to obtain mixed solution 1, and the mass fraction of nonionic surfactant Tween 60 in mixed solution 1 is 15% , the mass fraction of tungsten is 5.0%, the mass fraction of lithium sulfate is 8%, the pH value of the mixed solution 1 is adjusted to 2 with hydrochloric acid, and the mixed solution 2 is obtained;

[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 (2...

Embodiment 3

[0027] (1) Mix and stir nonionic surfactant Tween 40, tungsten-containing aqueous solution, ammonium sulfate aqueous solution and deionized water evenly to obtain mixed solution 1, and the mass fraction of nonionic surfactant Tween 40 in mixed solution 1 is 20% , the mass fraction of tungsten is 2.55%, the mass fraction of ammonium sulfate is 12%, and the pH value of the mixed solution 1 is adjusted to 2 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 tungsten in step (2...

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PUM

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Abstract

The invention provides a method for extracting and separating tungsten from a tungsten-containing aqueous solution through an aqueous two-phase system. The method mainly comprises the steps that a non-ionic surfactant of the Twain series, the tungsten-containing aqueous solution, a saline solution and deionized water are evenly mixed and stirred, specifically, the mass fraction of the non-ionic surfactant is 10%-20%, the mass fraction of the tungsten is 0.1%-5%, and the mass fraction of salt is 6-12%; the pH value is adjusted to be 2-3, after being stirred for 10-60 min at the temperature of 30-60 DEG C, the mixture is subjected to standing for phase splitting, the phase splitting time is 10-60 min, and then the aqueous two-phase system with the upper phase being the tungsten-loaded non-ionic surfactant phase and the lower phase being the aqueous phase is obtained; and the back extraction temperature is 40-70 DEG C, the back extraction time is 20-60 min, the phase splitting time is 20-60 min, the phase ratio of the tungsten-loaded non-ionic surfactant phase to the ammonium carbonate aqueous solution phase is 1-4:1, and the back extraction product is ammonium tungstate. By the adoption of the method for extracting and separating the tungsten from the tungsten-containing aqueous solution through the aqueous two-phase system, the extraction speed is high, the phase splitting is good, the single-stage extraction rate of tungsten (VI) reaches 97% or over, and the single-stage back extraction rate of the tungsten (VI) reaches 96% or over.

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 known as a strategic metal with excellent physical and chemical properties, so tungsten is widely used in various fields such as national defense industry, mechanical processing, and electronics industry. The tungsten industry is China's dominant industry. China's tungsten resource reserves, output and export volume rank first in the world. [0003] In terms of tungsten smelting process, the most widely used is the alkaline process including soda pressure cooking process and sodium hydroxide decomposition process. In China, the sodium hydroxide decomposition process is the main one. After tungsten minerals are processed by these processes, the obtained tungsten-containing solutions are alkaline or weakly alkaline. Usually, the feed solution contains impurities such as P, As, Si, and Mo that must be dee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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