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Method for preparing zinc molybdate by using cationic membrane electrolysis method

A cationic membrane, zinc molybdate technology, applied in the electrolysis process, electrolysis components, organic diaphragms, etc., can solve the problems of long reaction time with additives, difficulty in large-scale production, complicated preparation process, etc., and achieves reduced preparation cost and easy operation. , The effect of the preparation process is simple

Inactive Publication Date: 2015-03-04
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned preparation methods all have problems such as complex preparation process (such as equipment requiring high temperature and high pressure), high production cost, difficulty in large-scale production, presence of additives, or long reaction time (up to several hours or even days).

Method used

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  • Method for preparing zinc molybdate by using cationic membrane electrolysis method
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  • Method for preparing zinc molybdate by using cationic membrane electrolysis method

Examples

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Effect test

Embodiment 1

[0035] A kind of method utilizing cationic membrane electrolysis to prepare zinc molybdate, concrete steps are as follows:

[0036] (1) Use zinc sheet as anode, inert electrode as cathode, 95ml of sodium molybdate aqueous solution with a concentration of 0.01mol / L as anolyte, 90ml of alkali solution as catholyte, and double-chamber electrolysis with cationic membrane as diaphragm In the tank, the method of constant voltage electrolysis is adopted, and the temperature range is controlled from room temperature to 50°C. Constant voltage electrolysis of sodium molybdate aqueous solution for 10 minutes, namely Na + The ions are all transferred to the cathode chamber;

[0037] The inert electrode is a titanium mesh;

[0038] Described alkali solution is the sodium hydroxide aqueous solution that concentration is 0.01mol / L;

[0039] The cationic membrane is Nafion perfluorosulfonic acid 212 type cationic exchange membrane;

[0040] The voltage of the constant voltage electrolysis ...

Embodiment 2

[0045] A kind of method utilizing cationic membrane electrolysis to prepare zinc molybdate, concrete steps are as follows:

[0046] (1) Use zinc sheet as anode, inert electrode as cathode, 95ml of sodium molybdate aqueous solution with a concentration of 0.01mol / L as anolyte, 90ml of alkali solution as catholyte, and double-chamber electrolysis with cationic membrane as diaphragm In the tank, the method of constant current electrolysis is adopted, and the temperature range is controlled from room temperature to 50°C to electrolyze the sodium molybdate aqueous solution for 5.1min, that is, Na + The ions are all transferred to the cathode chamber;

[0047] The inert electrode is a titanium mesh;

[0048] Described alkali solution is the sodium hydroxide aqueous solution that concentration is 0.01mol / L;

[0049] The cationic membrane is Nafion perfluorosulfonic acid 212 type cationic exchange membrane;

[0050] The current density of the constant current electrolysis is 75mA / c...

Embodiment 3

[0055] A kind of method utilizing cationic membrane electrolysis to prepare zinc molybdate, concrete steps are as follows:

[0056] (1) Use zinc sheet as anode, inert electrode as cathode, 95ml of sodium molybdate aqueous solution with a concentration of 0.01mol / L as anolyte, 90ml of salt solution as catholyte, and double-chamber electrolysis with cationic membrane as diaphragm In the tank, the method of constant current electrolysis is adopted, and the temperature range is controlled from room temperature to 50°C to electrolyze the sodium molybdate aqueous solution for 5.1min, that is, Na + The ions are all transferred to the cathode chamber;

[0057] The inert electrode is a titanium mesh;

[0058] Described salt solution is the sodium chloride aqueous solution that concentration is 0.01mol / L;

[0059] The cationic membrane is Nafion perfluorosulfonic acid 212 type cationic exchange membrane;

[0060] The current density of the constant current electrolysis is 75mA / cm 2 ...

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Abstract

The invention discloses a method for preparing zinc molybdate by using a cationic membrane electrolysis method. The method comprises the following steps: by taking a zinc piece as a positive electrode, an inert electrode as a negative electrode, a sodium molybdate solution as anolyte, and an acid solution, an alkali solution or a salt solution as catholyte, electrolyzing the sodium molybdate solution at a temperature between the room temperature and 90 DEG C in a double-chamber electrolysis bath with a cationic membrane as a diaphragm in a constant-current electrolysis or constant-voltage electrolysis mode till Na+ ions are completely transferred to a negative electrode chamber; after the electrolysis is completed, washing the obtained product with deionized water and filtering at the same time; drying the obtained filter cake, heating to 450-600 DEG C at the heating rate of 2.5-10 DEG C / min in an air atmosphere, performing high-temperature roasting for 1-5 hours; and naturally cooling to room temperature, thus obtaining zinc molybdate which is high in purity and free of impurity phases. According to the method, the electrolysis function of a cationic membrane is adopted, and Na+ is transferred to the negative electrode chamber, so that the influence of Na+ is eliminated and the reaction time is shortened.

Description

technical field [0001] The invention belongs to the field of inorganic material preparation, in particular to a method for preparing zinc molybdate by cationic membrane electrolysis. technical background [0002] Zinc molybdate material has become a function that can be widely used in the fields of electromagnetic materials, aerospace, power storage and conversion due to its unique crystal structure and nano-effects, quantum effects and surface effects that are different from traditional bulk materials. Material. [0003] Zinc molybdate has low expansion coefficient, flame retardancy, processability and thermal resistance. In 2013, Mitsubishi Gas Co., Ltd. used molybdenum composite powder containing zinc molybdate for electrical insulation materials and prepregs, pressure plates and metal foil laminates on brushed circuit boards. In addition, molybdenum compounds such as zinc molybdate are recognized as the best smoke and flame retardants. The combination of zinc borate, ...

Claims

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Application Information

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IPC IPC(8): C25B1/00C25B13/08
CPCC25B1/00C25B13/08
Inventor 张全生贾李李闵凡奇党国举李细方李硕王淼王昭勍李海燕
Owner SHANGHAI INST OF TECH
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