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Synergic extraction agent for extracting and separating tungsten from molybdate solution, and method for extracting and separating tungsten from molybdate solution

A molybdate and extractant technology, applied in the field of rare metal extraction and separation, can solve the problems of difficult separation and removal of tungsten, high separation cost, and achieve the effect of reducing co-extraction amount, improving separation coefficient and good operating environment.

Active Publication Date: 2017-02-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problems of difficulty in separating and removing tungsten from molybdate solution and high separation cost in the prior art, the present invention provides a synergistic extractant for extracting and separating tungsten from molybdate solution

Method used

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  • Synergic extraction agent for extracting and separating tungsten from molybdate solution, and method for extracting and separating tungsten from molybdate solution
  • Synergic extraction agent for extracting and separating tungsten from molybdate solution, and method for extracting and separating tungsten from molybdate solution
  • Synergic extraction agent for extracting and separating tungsten from molybdate solution, and method for extracting and separating tungsten from molybdate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Feed liquid: ammonium molybdate solution containing tungsten, WO 3 19.34g / L, Mo 36.82g / L, WO 3 / Mo=0.525, pH value is 7.95.

[0062] Organic phase: see Table 1 for the composition. 0.23mol / LHNO before extraction 3 acidification.

[0063]The acidification time is 30min, the acidification ratio is O / A=1:2 (V / V), the extraction ratio is O / A (the volume ratio of the acidified organic phase and the solid liquid)=1:1, and the temperature is 25°C. The equilibration time was 10 minutes, and the experimental results obtained are listed in Table 1.

[0064] Table 1 Synergistic effect of primary amines and pyridine carboxylates on the extraction and separation of tungsten and molybdenum

[0065] Organic phase number 1 (comparative example 1) 2 (comparative example 2) 3 Primary amine (V / V%) 10 0 10 Pyridine carboxylate (V / V%) 0 20 20 Second-octanol (V / V%) 10 10 10 Sulfonated kerosene (V / V%) 80 70 60 Extraction rate of tungst...

Embodiment 2

[0068] Feed liquid: ammonium molybdate solution containing tungsten, WO 3 43.56g / L, Mo 24.82g / L, WO 3 / Mo=1.755, pH value is 10.5.

[0069] Organic phase: 10% by volume of N1923+4% by volume of n-octyl picolinate+20% by volume of 2-octanol+66% by volume of sulfonated kerosene, with 0.2mol / L of H before extraction 2 SO 4 The organic phase is acidified according to O / A=1 / 2 (volume ratio of organic phase to acid) (acidified organic phase is obtained).

[0070] Acidifying agent (for acidifying the organic phase and the organic phase after stripping): 0.2mol / L H 2 5O 4 aqueous solution

[0071] Detergent (alkaline lotion): 0.8mol / L (NH 3 ) 2 CO 3 aqueous solution

[0072] Stripping agent (alkaline stripping solution): 3.0mol / L NH 3 ·H 2 O aqueous solution

[0073] Operation: Firstly, the feed liquid is heated to volatilize and deammoniate, so that the pH value of the feed liquid drops to 7.9, and after cooling to room temperature, it is used as the feed liquid for extr...

Embodiment 3

[0078] Feed liquid: sodium tungsten molybdate solution, WO 3 5.11g / L, Mo 251.2g / L, WO 3 / Mo=0.020, the pH value is 9.0.

[0079] Organic phase: 5% by volume of Primene JMT+30% by volume of n-decyl 4-pyridinecarboxylate+10% by volume of isooctyl alcohol+55% by volume of sulfonated kerosene, the organic phase was compared with HCl of 2mol / L before extraction O / A=10 / 1 for acidification.

[0080] Detergent (alkaline lotion): 2mol / L Na 2 CO 3 aqueous solution

[0081] Stripping agent (alkaline stripping solution): 5.0mol / L NaOH aqueous solution

[0082] Operation: first add hydrochloric acid to the feed liquid to lower its pH value to 7.5, and store it as feed liquid for extraction and removal of tungsten.

[0083] The feed liquid and the acidified organic phase are subjected to multi-stage fractional distillation extraction. During the fractional distillation extraction process, tungsten is enriched in the loaded organic phase (extraction layer), and molybdenum is enriched ...

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Abstract

The invention discloses a synergic extraction agent for extracting and separating tungsten from a molybdate solution. The synergic extraction agent for extracting and separating the tungsten from the molybdate solution comprises a primary amine extracting agent and pyridine carboxylic acid. In addition, the invention further discloses a method for extracting and separating the tungsten from the tungstenic molybdate solution. The method comprises the following steps of firstly adjusting a pH value of the tungstenic molybdate solution to be 7.5 to 8.5, and then contacting with an organic phase containing the synergic extraction agent subjected to acidizing so as to carry out multistage extraction, wherein a detergent is an alkaline solution, and during a multistage extraction process, the tungsten is enriched in the loaded organic phase, and molybdenum is enriched in raffinate, so that further removal of the tungsten in the molybdate solution is realized. The loaded organic phase adopts the alkaline solution for re-extracting to obtain a strip liquor rich in the tungsten. The re-extracted organic phase is treated through an inorganic acid solution so as to return to extraction. According to the synergic extraction agent for extracting and separating the tungsten from the molybdate solution and the method for extracting and separating the tungsten from the molybdate solution provided by the invention, the effect on removal of the tungsten in the molybdate solution with high tungsten content is good, the process flow is short, the cost is low, and the industrialization can be realized easily.

Description

technical field [0001] The invention belongs to the field of extraction and separation of rare metals in hydrometallurgy, and specifically relates to a synergistic extractant for extracting and separating tungsten from a molybdate solution, and also relates to using the synergistic extractant to extract and separate molybdenum acid containing tungsten The method of tungsten in saline solution. Background technique [0002] As important strategic metals of the country, tungsten and molybdenum are widely used in industrial production, national defense construction and other fields. Tungsten and molybdenum are strictly controlled impurity metals in molybdenum and tungsten metallurgical products respectively. For example, the national standard GB10116-2007 stipulates that the molybdenum content in grade 0 APT (ammonium paratungstate) is not more than 20ppm, and the national standard GB / T3460-2007 stipulates that MSA-0 grade ammonium molybdate The tungsten content in the product...

Claims

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Application Information

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IPC IPC(8): C22B3/40C22B34/34C22B34/36
CPCC22B34/34C22B34/36C22B3/406Y02P10/20
Inventor 张贵清关文娟曾理肖连生李治华王傲难李青刚曹佐英
Owner CENT SOUTH UNIV
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