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A kind of method utilizing sodium vanadate solution electrolysis to prepare ammonium polyvanadate

A technology of ammonium polyvanadate and sodium vanadate, applied in electrolysis components, electrolysis process, cells and other directions, can solve the problems of clean production, high production cost and long process flow of unfavorable environmental protection products, and achieve efficient utilization of resources. , easy operation, simple process effect

Active Publication Date: 2020-09-08
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it needs to consume a large amount of acid and ammonium salt in the vanadium precipitation process, resulting in a large amount of Na + and NH 4 + High-salt ammonia-nitrogen wastewater not only wastes resources, but also is difficult to treat, causing potential environmental problems
The whole technological process is long, the process is complicated, and the production cost is high, which is not conducive to the protection of the environment and the clean production of products

Method used

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  • A kind of method utilizing sodium vanadate solution electrolysis to prepare ammonium polyvanadate

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Effect test

Embodiment 1

[0046] (1) The solution after vanadium slag sodium roasting is used as electrolytic anolyte, the anolyte composition is: Na 81g / L, V 28g / L; catholyte composition: NaOH 60 / L; The anode chamber and cathode chamber of the chamber electrolyzer are electrolyzed, the electrolysis temperature is 30°C, and the current density is 1000A / m 2 , the two chambers are separated by a DuPont N117 cation exchange membrane, and the titanium ruthenium-plated electrode and the Ni electrode are respectively used as the electrolytic anode and cathode;

[0047] (2) After 4 hours of electrolysis, the solution in the anode chamber is transferred out and ammonium metavanadate is added for heating and stirring to control the amount of NH in the ammonium metavanadate 4+ The molar ratio of V in the anode chamber solution is 1:3, and the stirring speed is 300r / min, ammonium polyvanadate crystallizes out rapidly, after the obtained slurry is filtered, the solid phase is dried to obtain the ammonium polyvanad...

Embodiment 2

[0050] (1) Use NaOH solution to directly pressurize the leaching solution of vanadium slag as electrolysis anolyte, anolyte composition: Na79g / L, V 31g / L, catholyte composition: NaOH 90g / L; add anolyte and catholyte respectively The anode chamber and cathode chamber of the three-chamber electrolytic cell are electrolyzed, the electrolysis temperature is 70°C, and the current density is 950A / m 2 , the electrolytic chamber is separated by DuPont 2050 cation exchange membrane, and the ruthenium-plated Ti electrode and Ni electrode are respectively used as electrolytic anode and cathode;

[0051] (2) After 3 hours of electrolysis, return the leached vanadium raw material after the NaOH solution in the cathode chamber is concentrated, transfer the solution in the anode chamber and add ammonium metavanadate for heating and stirring, and control the NH in the ammonium metavanadate 4+ The molar ratio of V in the anode chamber solution is 1:2.5, and the stirring speed is 200r / min. Ammo...

Embodiment 3

[0054] (1) The solution after vanadium-titanium magnetite sodium roasting is used as the electrolytic anolyte, the anolyte composition is: Na 70g / L, V24g / L; the catholyte composition: NaOH 120g / L, the anolyte and the catholyte are respectively Add the anode chamber and cathode chamber of the two-chamber electrolytic cell for electrolysis, the electrolysis temperature is 50°C, and the current density is 900A / m 2 , the electrolysis chamber is separated by Asahi Glass F8080 cation exchange membrane, and the platinum-plated titanium electrode and the carbon steel electrode are respectively used as the electrolysis anode and cathode;

[0055] (2) After electrolysis for 6 hours, the solution in the anode chamber is transferred out and ammonium metavanadate is added for heating and stirring to control the amount of NH in the ammonium metavanadate 4+ The molar ratio of V in the anode chamber solution is 1:1.5, the stirring speed is 100r / min, ammonium polyvanadate crystallizes out rapi...

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Abstract

The invention relates to a method for preparing ammonium polyvanadate by electrolysis of sodium vanadate solution. The method is as follows: adding sodium vanadate solution into the anode chamber of the electrolytic cell, adding NaOH solution into the cathode chamber of the electrolytic cell, and passing the anode chamber and the cathode chamber The cation exchange membrane is separated, and electrolysis is started; after the electrolysis is completed, the solution in the anode chamber is transferred out, mixed with ammonium metavanadate and heated for reaction, and the resulting slurry is separated from solid and liquid to obtain ammonium polyvanadate and sodium vanadate solution. The present invention achieves the purposes of enriching vanadium and recovering alkali through the membrane electrolysis method, and can directly produce ammonium polyvanadate products by adding ammonium metavanadate, greatly reducing the amount of ammonium salt used in the traditional vanadium precipitation process. The whole process route is simple and easy, can realize the full recovery of vanadium and alkali, no waste water is discharged during the treatment process, achieves the purpose of clean production and recycling, and has good economic benefits and application prospects.

Description

technical field [0001] The invention belongs to the field of preparation of vanadium products, in particular to a method for preparing ammonium polyvanadate by electrolysis of sodium vanadate solution. Background technique [0002] Ammonium polyvanadate is light yellow crystal powder, mainly used as chemical reagent, catalyst, drier, mordant, etc. It is widely used as glaze in ceramic industry, and is an important raw material for producing vanadium pentoxide and vanadium trioxide. [0003] In industrial production, ammonium polyvanadate is generally prepared from a vanadium-containing solution by ammonium salt precipitation. For example, CN106629846A discloses a method for preparing ammonium polyvanadate from a sodiumized roasting leachate, said method comprising: adding an alkaline substance to the sodiumized roasting leachate, filtering after stirring to obtain a sodium vanadate solution; adjusting the pH, and then adding impurity removal agent, stirring and filtering to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00C25B9/08C25B9/19
CPCC25B1/00C25B9/19
Inventor 杜浩刘彪潘博王少娜郑诗礼
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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