Synergistic extractant 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 and high separation cost, and achieve the effects of reducing the amount of co-extraction, improving the separation coefficient, and improving the yield and purity.

Active Publication Date: 2017-12-26
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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  • Synergistic extractant for extracting and separating tungsten from molybdate solution and method for extracting and separating tungsten from molybdate solution
  • Synergistic extractant for extracting and separating tungsten from molybdate solution and method for extracting and separating tungsten from molybdate solution
  • Synergistic extractant for extracting and separating tungsten from molybdate solution and method for extracting and separating tungsten from molybdate solution

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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

[0066] When a single primary amine extractant extracts high-concentration tungsten, a small amount of third phase can be observed in the aqueous phase after extraction; it can be seen from Table 1 that the extraction rate of tungsten is significantly ...

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 (basic 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 extract...

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 synergistic extractant comprising a primary amine extractant and a pyridine carboxylate for extracting and separating tungsten from a molybdate solution. In addition, a method for deep tungsten removal by extraction from a tungsten-containing molybdate solution is disclosed; firstly, the pH value of the tungsten-containing molybdate solution is adjusted to 7.5-8.5, and then an acidified solution containing a synergistic extractant is combined with The organic phase is contacted for multi-stage extraction, and the detergent is an alkaline solution. During the multi-stage extraction process, tungsten is enriched in the loaded organic phase, and molybdenum is enriched in the raffinate to achieve deep tungsten removal in the molybdate solution. The loaded organic phase is back-extracted with an alkaline solution to obtain a tungsten-rich back-extraction solution. After the reaction, the organic phase was treated with an inorganic acid solution and then returned to extraction. The invention has good tungsten removal effect from the molybdate solution with high tungsten content, short process, low cost, and is easy to realize industrialization.

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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Patent Type & Authority Patents(China)
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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