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Method for preparing ammonium polymolybdate solution based on bipolar membrane electrodialysis

A technology of bipolar membrane electrodialysis and ammonium polymolybdate, applied in electrodialysis, preparation of molybdenum compounds, chemical instruments and methods, etc., can solve the problems of high energy consumption, large consumption, and large equipment investment, and achieve equipment investment Low, low power consumption, high molybdenum yield effect

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

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Problems solved by technology

[0004] In order to solve the series of problems caused by the large consumption of inorganic acid in the existing preparation method of ammonium polymolybdate or the shortage of large equipment investment and high energy consumption, the present invention provides a method of using ammonium molybdate solution as raw material and adopting bipolar membrane electrodialysis A method for preparing ammonium polymolybdate solution; aims to realize the acid adjustment mode without adding acid in the preparation process, obtain high-quality ammonium polymolybdate solution, and then overcome the shortcomings of traditional processes, and provide a low investment and low energy consumption , Discontinuous or continuous production method of ammonium polymolybdate solution with high molybdenum direct yield

Method used

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  • Method for preparing ammonium polymolybdate solution based on bipolar membrane electrodialysis
  • Method for preparing ammonium polymolybdate solution based on bipolar membrane electrodialysis

Examples

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Effect test

Embodiment 1

[0067] 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 1 shown. Ammonium molybdate solution contains Mo 103.45g / L. The solution initially filled into the circulation tank of the acidification chamber is ammonium polymolybdate solution, in which Mo is 125.0g / L, the pH value is about 3.0, and the volume is 6.0L. The solution initially filled into the circulation tank of the alkali chamber is NH 4 HCO 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 NH 4 HCO 3 solution. The solution initially filled into the circulation ta...

Embodiment 2

[0069] 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. The ammonium molybdate solution contains Mo 62.6g / L. The solution initially filled into the circulation tank of the acidification chamber is obtained by diluting the ammonium polymolybdate solution prepared in Example 1 with deionized water, in which the Mo content is 62.5g / L, the pH value is about 2.0, and the volume is 6.0L.

[0070] The solution initially filled into the circulation tank of the alkali chamber is (NH 4 ) 2 CO 3 solution with a concentration of 0.1mol / L and a volume of 5L. The solution that is going to be continuously added to the alkali chamber is also a concentration of 0.1mol / L (NH 4 ) 2 CO 3 solution. The solution initially filled into the circulation tank of the electrode chamber is NH 4 OH solution with a concentration of 1.0mol / L and a volume of 5L. After the power-on operati...

Embodiment 3

[0072] The equipment used is the same as that of Example 1, except that the cathode and anode are platinum-plated titanium plate electrodes. Ammonium molybdate solution contains Mo 41.4g / L. The solution initially filled into the circulation tank of the acidification chamber is obtained by diluting the ammonium polymolybdate solution prepared in Example 2 with deionized water, wherein the Mo is 8.56g / L, the pH value is about 4.0, and the volume is 6.0L. The solution initially filled into the circulation tank of the alkali chamber is NH 4 NO 3 solution with a concentration of 0.5mol / L and a volume of 5L. The solution to be continuously added to the alkali chamber is NH with a concentration of 0.5mol / L 4 NO 3 solution. The solution initially filled into the circulation tank of the electrode chamber is NH 4 NO 3 solution with a concentration of 1.0 mol / L and a volume of 5 L. After the electrodialysis operation starts, the ammonium molybdate solution is continuously added t...

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Abstract

The invention discloses a method for preparing an ammonium polymolybdate solution based on bipolar membrane electrodialysis. The method comprises the following steps: taking an ammonium molybdate solution as a raw material and adopting a bipolar-membrane electrodialysis system with a two-chamber bipolar membrane electrodialysis membrane stack to remove one part of ammonium ions in the ammonium molybdate solution and reducing the pH (Potential of Hydrogen) value in a bipolar-membrane electrodialysis process under the action of a direct-current electric field force; directly obtaining the ammonium polymolybdate solution in an acidifying chamber of the bipolar-membrane electrodialysis system. According to the method disclosed by the invention, organic acid does not need to be consumed and impurity anions are not introduced; the method has the advantages of short flow, high direct recovery rate, low power consumption, environment friendliness and easiness of realizing industrialization.

Description

technical field [0001] The invention relates to a preparation method of ammonium polymolybdate solution, in particular to a method for preparing ammonium polymolybdate solution by using ammonium molybdate solution as raw material and adopting bipolar membrane electrodialysis technology. Background technique [0002] Ammonium molybdate is an important isopolyacid salt of molybdenum and an intermediate product. At present, the domestic ammonium molybdate products mainly include ammonium dimolybdate, ammonium tetramolybdate, ammonium heptamolybdate, ammonium polymolybdate, etc. Ammonium polymolybdate is an ammonium molybdate product mainly composed of ammonium tetramolybdate and a small amount of ammonium octamolybdate. It is the product variety with the most manufacturers and the largest output in the series of ammonium molybdate products. It is often used to prepare high-purity ammonium dimolybdate and high-purity ammonium heptamolybdate, and can also be directly used to prod...

Claims

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Application Information

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IPC IPC(8): B01D61/44B01D61/48B01D61/52B01D61/54C01G39/00
CPCB01D61/445B01D61/48B01D61/485B01D61/52B01D61/54C01G39/003
Inventor 张贵清关文娟王强姚琨曾理李青刚曹佐英肖连生
Owner CENT SOUTH UNIV
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