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

The technology of a two-phase system and aqueous solution is applied in the field of materials to achieve the effects of simple and easy process, good phase separation and fast extraction rate

Active Publication Date: 2018-09-28
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the extraction efficiency of this invention still 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 PEG1000, tungsten-containing aqueous solution, sodium sulfate aqueous solution and deionized water evenly to obtain mixed solution 1. In mixed solution 1, the mass fraction of PEG1000 is 10%, the mass fraction of tungsten is 0.1%, and the mass fraction of sodium sulfate is 10%. %, adjust the pH value of the mixed solution 1 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 20min, and a two-phase aqueous system is obtained in which the upper phase is a PEG1000 phase loaded with tungsten (VI), and the lower phase is an aqueous phase;

[0019] (3) Mix the PEG1000 phase solution loaded with tungsten (VI) in step (2) with the ammonium carbonate aqueous solution, so that the rati...

Embodiment 2

[0022] (1) Mix and stir PEG2000, tungsten-containing aqueous solution, lithium sulfate aqueous solution and deionized water evenly to obtain mixed solution 1. In mixed solution 1, the mass fraction of PEG2000 is 15%, the mass fraction of tungsten is 5.0%, and the mass fraction of lithium sulfate is 8. %, adjust the pH value of the mixed solution 1 to 2 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 is obtained in which the upper phase is a tungsten-loaded PEG2000 phase and the lower phase is an aqueous phase;

[0024] (3) Mix the PEG2000 phase solution loaded with tungsten (VI) in step (2) with the ammonium carbonate aqueous solution, so that the ratio of th...

Embodiment 3

[0027] (1) Mix and stir PEG4000, tungsten-containing aqueous solution, ammonium sulfate aqueous solution and deionized water evenly to obtain mixed solution 1. In mixed solution 1, the mass fraction of PEG4000 is 20%, the mass fraction of tungsten is 2.55%, and the mass fraction of ammonium sulfate is 12% %, adjust the pH value of the mixed solution 1 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 tungsten-loaded PEG4000 phase and the lower phase is an aqueous phase is obtained;

[0029] (3) Mix the PEG4000 phase solution loaded with tungsten (VI) with the ammonium carbonate aqueous solution in step (2), so that the ratio of...

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Abstract

The invention relates to a method for extracting and separating tungsten in an aqueous solution from an aqueous two-phase system. The method is characterized in that polyethylene glycol, a tungsten-containing aqueous solution, a saline solution, and deionized water are mixed and uniformly stirred, the mass fraction of a nonionic surfactant is 10-20%, the mass fraction of tungsten is 0.1-5%, and the mass fraction of salt is 6-12%; a pH value is adjusted to 2-3, the material is stirred for 10-60 min at the temperature of 30-60 DEG C, standing is carried out for phase splitting for 10-60 min, andthe aqueous two-phase system having an upper phase being a nonionic surfactant phase loaded with phase and a bottom phase being an aqueous-phase; the back extraction temperature is 40-70 DEG C, the stirring time is 20-60 min, and the phase separating time is 20-60 min, the phase ratio (A:O) of the nonionic surfactant phase loaded with phase to an ammonium carbonate aqueous solution is 1:1-4:1, and the back-extraction product is ammonium tungstate. The method has the advantages of fast extraction rate and good phase separating, tungsten single-stage extraction yield can achieve more than 98%,and the tungsten single-stage back-extraction yield can achieve more than 97%.

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 non-ferrous metal and an important strategic metal in the world. Tungsten ore was called "heavy stone" in ancient times. In 1781, Swedish chemist Carl William Sheyer discovered scheelite and extracted a new elemental acid - tungstic acid. In 1783, the Spanish Depuria discovered wolframite and extracted tungstic acid. In the same year, The reduction of tungsten trioxide with carbon yielded tungsten powder for the first time and named the element. The content of tungsten in the earth's crust is 0.001%. There are 20 kinds of tungsten-containing minerals that have been discovered. Tungsten deposits are generally formed with the activity of granitic magma. After smelting, tungsten is a silvery-white shiny metal with a very high melting point and high hardness. [0003] At present, the mainstream tungs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/26C22B34/36
CPCC22B34/36C22B3/262Y02P10/20
Inventor 张永强王萍张帆孙婷婷李攀潘雅静
Owner YANSHAN UNIV
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