Method for preparing zinc tungstate by using cationic membrane electrolysis process

A cationic membrane, zinc tungstate technology, applied in the electrolysis process, electrolysis components, cells, etc., can solve the problems of long (several hours or even days, the reaction time of additives, etc., to achieve short reaction time, easy operation, high purity effect

Inactive Publication Date: 2015-02-18
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the solid-state synthesis method has a lot of metal oxide impurities because the raw material mixing cloth is uniform; The shortcoming of sol-gel method, aqueous phase precipitation method, hydrothermal method, microwave method etc. is that the existence of additive is arranged or reaction time is longer (up to hours or even days)

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  • Method for preparing zinc tungstate by using cationic membrane electrolysis process
  • Method for preparing zinc tungstate by using cationic membrane electrolysis process
  • Method for preparing zinc tungstate by using cationic membrane electrolysis process

Examples

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Effect test

Embodiment 1

[0034] A kind of method utilizing cationic membrane electrolysis to prepare zinc tungstate, concrete steps are as follows:

[0035] (1) Using zinc sheet as anode, inert electrode as cathode, 95ml of sodium tungstate 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 tungstate aqueous solution for 10 minutes, namely Na + The ions are all transferred to the cathode chamber;

[0036] The inert electrode is a titanium mesh;

[0037] Described alkali solution is the sodium hydroxide aqueous solution that concentration is 0.01mol / L;

[0038] The cationic membrane is Nafion perfluorosulfonic acid 212 type cationic exchange membrane;

[0039] The voltage of the constant voltage electroly...

Embodiment 2

[0044] A kind of method utilizing cationic membrane electrolysis to prepare zinc tungstate, concrete steps are as follows:

[0045] (1) Using zinc sheet as anode, inert electrode as cathode, 95ml of sodium tungstate 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 tungstate aqueous solution for 5.1min, that is, Na + The ions are all transferred to the cathode chamber;

[0046] The inert electrode is a titanium mesh;

[0047] Described alkali solution is the sodium hydroxide aqueous solution that concentration is 0.01mol / L;

[0048] The cationic membrane is Nafion perfluorosulfonic acid 212 type cationic exchange membrane;

[0049] The current density of the constant current electrolysis is 75mA...

Embodiment 3

[0054] A kind of method utilizing cationic membrane electrolysis to prepare zinc tungstate, concrete steps are as follows:

[0055] (1) Using zinc sheet as anode, inert electrode as cathode, 95ml of sodium tungstate 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 tungstate aqueous solution for 5.1min, that is, Na + The ions are all transferred to the cathode chamber;

[0056] The inert electrode is a titanium mesh;

[0057] Described salt solution is the sodium chloride aqueous solution that concentration is 0.01mol / L;

[0058] The cationic membrane is Nafion perfluorosulfonic acid 212 type cationic exchange membrane;

[0059] The current density of the constant current electrolysis is 75mA / cm ...

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Abstract

The invention provides a method for preparing zinc tungstate by using a cationic membrane electrolysis process. The method comprises the steps of utilizing a zinc sheet as an anode, a noble electrode as a cathode, an aqueous solution containing sodium tungstate as an anode liquor, and an acid/alkali/salt solution as a cathode liquor; in a double-compartment electrolytic cell with a cationic membrane as a diaphragm, controlling the temperature from room temperature to 90 DEG C to electrolyze the aqueous solution containing sodium tungstate in a constant-current electrolysis or constant-voltage electrolysis manner till all Na<+> ions are transferred to a cathode compartment; simultaneously cleaning and filtering products from the anode by using deionized water to obtain a filter cake, drying the filter cake, and then increasing the temperature to 450-600 DEG C under air atmosphere at the speed of 2.5-10 DEG C/min to perform high-temperature roasting on the dried filter cake for 1-5 hours; naturally cooling the roasted product to the room temperature, and then obtaining the zinc tungstate with high purity and no impure phase. According to the method for preparing the zinc tungstate by using the cationic membrane electrolysis process, all the Na<+> ions are transferred to the cathode compartment under the action of the cationic membrane electrolysis, so that the Na<+> influence is eliminated and the reaction time is short.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and in particular relates to a method for preparing zinc tungstate by using cationic membrane electrolysis. technical background [0002] ZnWO with wolframite structure 4 It is an important inorganic material, because of its excellent chemical stability, high refractive index, high X-ray absorption coefficient, high quantum yield and good photoelectric activity, it is used in X-, γ-ray scintillators, photoelectric Applications include luminescence, microwave systems, solid-state lasers, gas and humidity sensors, photocatalysis, acousto-optic fibers, and magnetic materials. [0003] In ZnWO 4 In terms of synthesis, the most widely used methods mainly include: sol-gel method, solid-state synthesis, molten salt method, mechanochemical synthesis method, ultrasonic method, solvothermal method, hydrothermal method, etc. But the solid-state synthesis method has a lot of metal oxide impurities becau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C25B9/10C25B9/23
CPCC25B1/00C25B9/23
Inventor 张全生闵凡奇李细方党国举李硕王淼王昭勍李海燕贾李李
Owner SHANGHAI INST OF TECH
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