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Method of preparing sodium metatungstate solution based on bipolar membrane electrodialysis

A bipolar membrane electrodialysis and sodium metatungstate technology, applied in electrodialysis, chemical instruments and methods, membrane technology, etc., can solve the problems of high energy consumption and large equipment investment, and achieve low energy consumption and high tungsten yield. , to ensure high efficiency

Inactive Publication Date: 2017-08-22
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the series of problems caused by the large consumption of inorganic acid in the existing preparation method of sodium metatungstate or the shortage of large equipment investment and high energy consumption, the present invention provides a method of using sodium tungstate solution as raw material and adopting bipolar membrane electrodialysis A method for preparing sodium metatungstate solution; aims to realize the acid adjustment mode without adding acid in the preparation process, obtain high-quality sodium metatungstate solution, and then overcome the shortcomings of traditional processes, and provide a low investment and low energy consumption Discontinuous or continuous production method of sodium metatungstate solution with high direct yield of tungsten

Method used

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  • Method of preparing sodium metatungstate solution based on bipolar membrane electrodialysis
  • Method of preparing sodium metatungstate solution based on bipolar membrane electrodialysis

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Embodiment 1

[0065] Using a basic structure such as figure 2 In the electrodialysis system shown, the membrane stack of the electrodialyzer includes 20 two-chamber units, and the effective area of ​​a single membrane is 0.02m 2 , the bipolar membrane is NEOSEPTA BP-1, the cation exchange membrane is NEOSEPTA CMB, the anode and cathode are both titanium-plated nickel-plated electrodes, and the membrane stack structure is as follows figure 1shown. Sodium tungstate solution containing WO 3 252g / L. The solution initially filled into the circulation tank of the acidification chamber is sodium metatungstate solution, where WO 3 300.8g / L, pH value around 3.2, volume 6.0L. The solution initially filled into the circulation tank of the alkali chamber is NaHCO 3 solution with a concentration of 1.0 mol / L and a volume of 5 L. The solution continuously added to the alkali chamber is 1.0mol / L NaHCO 3 solution. The solution initially filled into the circulation tank of the electrode chamber is ...

Embodiment 2

[0067] Using a basic structure such as figure 2 The electrodialysis system shown, wherein the membrane stack of the electrodialyzer is the same as that of embodiment 1. Sodium tungstate solution containing WO 3 150.1g / L,. The solution initially filled into the circulation tank of the acidification chamber is obtained by diluting the sodium metatungstate solution prepared in Example 1 with deionized water, wherein WO 3 145.2g / L, pH value around 2.0, volume 6.0L.

[0068] The solution initially filled into the circulation tank of the alkali chamber is Na 2 CO 3 solution with a concentration of 0.1mol / L and a volume of 5L. The solution to be continuously added to the alkali chamber is also Na with a concentration of 0.1mol / L 2 CO 3 solution. The solution initially filled into the circulation tank of the electrode chamber is NaOH solution with a concentration of 1.0 mol / L and a volume of 5 L. After the power-on operation starts, the sodium tungstate solution is continu...

Embodiment 3

[0070] The equipment used is the same as that of Example 1, except that the cathode and anode are platinum-plated titanium plate electrodes. Sodium tungstate solution containing WO 3 98.9g / L. The solution initially filled into the circulation tank of the acidification chamber is obtained by diluting the sodium metatungstate solution prepared in Example 2 with deionized water, wherein WO 3 51.1g / L, pH value around 4.0, volume 6.0L. The solution initially filled into the circulation tank of the alkali chamber is NaOH solution with a concentration of 0.5mol / L and a volume of 5L. The solution to be continuously added to the alkali chamber is NaOH solution with a concentration of 0.5mol / L. The solution initially filled into the circulation tank of the electrode chamber is NaOH solution with a concentration of 1.0 mol / L and a volume of 5 L. After the electrodialysis operation starts, the sodium tungstate solution is continuously added to the inlet pipeline of the acidification...

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Abstract

The invention discloses a method of preparing a sodium metatungstate solution based on bipolar membrane electrodialysis. The method comprises the following steps: by taking a sodium tungstate solution as a raw material, under the action of a direct-current electric field, removal of a part of sodium ions in the sodium tungstate solution and lowering of a pH value of the sodium tungstate solution are realized through a bipolar membrane electrodialysis process by adopting a bipolar membrane electrodialysis system with two rooms of bipolar membrane electrodialysis packs, and directly obtaining the sodium metatungstate solution in an acidification chamber of the bipolar membrane electrodialysis system. Without consuming inorganic acid and introducing impurity anions, the method has the advantages of short flow, high direct recovery, low power consumption, environmental protection and easiness in realizing industrialization.

Description

technical field [0001] The invention relates to a method for preparing sodium metatungstate solution, in particular to a method for preparing sodium metatungstate solution by using bipolar membrane electrodialysis technology with sodium tungstate solution as raw material. Background technique [0002] Sodium metatungstate is an important tungsten chemical product, its molecular formula is [Na 6 (H 2 W 12 o 40 )·3H 2 O]. High-concentration sodium metatungstate solution can reach as high as 3.1g / cm 3 Density, this highly concentrated solution can be used in oil drilling, as an important intermediate in the manufacture of heteropolysalts, as electrodes in fuel cells and in cigarette filters. In addition, it is also used in fireproof textiles. [0003] Sodium metatungstate solution can be prepared by acidifying sodium tungstate solution. Acidify sodium tungstate solution to n(H+) / n(WO 4 2- )=1.5, the metastable φ metatungstate anion is initially formed, which cannot be...

Claims

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Application Information

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IPC IPC(8): C01G41/00B01D61/48B01D61/52
CPCC01G41/00B01D61/485B01D61/52
Inventor 关文娟张贵清姚琨尚广浩曹佐英曾理李青刚肖连生
Owner CENT SOUTH UNIV
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