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Method for extracting and separating tungsten and molybdenum from aqueous solution

An aqueous solution and extraction technology, applied in the field of metallurgy, can solve problems such as human health hazards and environmental pollution

Active Publication Date: 2021-06-04
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solvent extraction separation method is a relatively mature separation technology of tungsten and molybdenum in the industry at present, but most of the solvents are organic solvents, which are not only harmful to human health, but also cause environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Mix nonionic surfactant PEG4000, tungsten-containing aqueous solution (paratungstic acid B solution), molybdenum-containing aqueous solution (sodium molybdate solution), complexing agent solution (sodium tartrate solution), sodium sulfate aqueous solution and deionized water Stir evenly to obtain a mixed solution. In the mixed solution, the mass fraction of nonionic surfactant PEG4000 is 20%, the mass fraction of tungsten is 2.0%, the mass fraction of molybdenum is 0.5%, the mass fraction of sodium tartrate is 5%, and the mass fraction of sodium sulfate is 6%. %, with a concentration of 6mol / L sulfuric acid to adjust the pH value of the mixed solution to 1.0, to obtain a two-phase extraction system;

[0042] (2) Put the two-phase extraction system of step (1) into a constant temperature magnetic stirrer to stir, set the temperature to 80°C, and stir for 30 minutes. phase, the phase separation time is 120min, and an upper phase and a lower phase are obtained, the upp...

Embodiment 2

[0045] (1) Combine non-ionic surfactant PEG2000, tungsten-containing aqueous solution (paratungstic acid B solution), molybdenum-containing aqueous solution (sodium molybdate solution), complexing agent solution (sodium citrate solution), sodium sulfate aqueous solution and deionized The water is mixed and stirred evenly to obtain a mixed solution. In the mixed solution, the mass fraction of nonionic surfactant PEG2000 is 20%, the mass fraction of tungsten is 2.0%, the mass fraction of molybdenum is 0.5%, the mass fraction of sodium citrate is 3%, and the mass fraction of sodium sulfate The mass fraction is 8%, and the pH value of the mixed solution 1 is adjusted to 2.0 with sulfuric acid with a concentration of 6 mol / L to obtain a two-phase extraction system;

[0046] (2) Put the two-phase extraction system of step (1) into a constant temperature magnetic stirrer to stir, set the temperature to 70°C, and stir for 60 minutes. After stirring, place it in a constant temperature w...

Embodiment 3

[0049] (1) Combine nonionic surfactant L35, tungsten-containing aqueous solution (paratungstic acid B solution), molybdenum-containing aqueous solution (sodium molybdate solution), complexing agent solution (sodium citrate solution), sodium sulfate aqueous solution and deionized Water is mixed and stirred evenly to obtain a mixed solution. In the mixed solution, the mass fraction of nonionic surfactant L35 is 10%, the mass fraction of tungsten is 3.0%, the mass fraction of molybdenum is 0.1%, the mass fraction of sodium citrate is 4%, and the mass fraction of sodium sulfate The mass fraction is 7%, and the pH value of the mixed solution is adjusted to 3.0 with sulfuric acid with a concentration of 6 mol / L to obtain a two-phase extraction system;

[0050] (2) Put the two-phase extraction system of step (1) into a constant temperature magnetic stirrer to stir, set the temperature to 80°C, and stir for 30 minutes. phase, the phase separation time is 60min, and the upper phase and...

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PUM

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Abstract

The invention relates to the technical field of metallurgy, and provides a method for extracting and separating tungsten and molybdenum from an aqueous solution. According to the method, a tungsten-molybdenum mixed aqueous solution, a nonionic surfactant, a complexing agent, sodium sulfate and water are mixed, the pH value of the mixed solution is adjusted to be smaller than or equal to 3, an aqueous two-phase extraction system is obtained, an upper phase and a lower phase are obtained through stirring and standing phase splitting, the upper phase is a tungsten-rich nonionic surfactant phase, and the lower phase is a molybdenum-rich aqueous phase. Under the acidic condition, tungsten mainly exists in the form of paratungstate B anions, molybdenum exists in the form of paramolybdate ions, a hydrophilic complex is formed by the complexing agent and the paramolybdate ions, therefore, molybdenum is left in the aqueous phase, the paratungstate B anions enter the nonionic surfactant phase by means of the high hydrophobicity of the paratungstate B anions, and efficient separation of tungsten and molybdenum is achieved. The method provided by the invention has the advantages of high extraction rate, high separation efficiency, no emulsification phenomenon, no use of any toxic, harmful, flammable, explosive and volatile organic solvents, simple operation and environmental protection.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for extracting and separating tungsten and molybdenum from aqueous solution. Background technique [0002] Both tungsten and molybdenum are rare metals with high melting points, which are indispensable for industrial development. Because both have good high temperature strength, wear resistance and corrosion resistance, thermal conductivity, low thermal expansion coefficient and stable chemical properties, they are widely used in many technical fields, such as metallurgy, petrochemical, welding, electronics, aerospace, etc. field. With the development of science and technology, the application fields of tungsten and molybdenum continue to expand, and the prospect is very broad. [0003] Tungsten, which has the reputation of "industrial teeth", is famous for its high melting point and high hardness. We are most exposed to tungsten products than the filaments in light...

Claims

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Application Information

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IPC IPC(8): C22B34/36C22B34/34C22B3/26
CPCC22B34/36C22B34/34Y02P10/20
Inventor 张永强孙晓秦茹车相静李睿思张艳娟陈莹玮
Owner YANSHAN UNIV
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