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Method used for preparing ammonium polyorthovanadate from sodium vanadate solution through electrolysis

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

Active Publication Date: 2019-02-26
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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  • Method used for preparing ammonium polyorthovanadate from sodium vanadate solution through electrolysis

Examples

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Effect test

Embodiment 1

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

[0047] (2) after electrolysis 4h, the anode chamber solution is turned out and adds ammonium metavanadate to carry out heating and stirring, and controls NH in ammonium metavanadate 4+ The molar ratio of V to the anode chamber solution is 1:3, the stirring speed is 300 r / min, and the ammonium polyvanadate is rapidly crystallized and precipitated. After the obtained slurry is filtered, the...

Embodiment 2

[0050] (1) The leaching solution of the NaOH solution directly pressurized and leaching the vanadium slag is used as the electrolytic anolyte, the anolyte composition is: Na 79g / L, V 31g / L, the catholyte composition: NaOH 90g / L; The anolyte and catholyte are added respectively The anode chamber and cathode chamber of the three-chamber electrolysis cell are electrolyzed at a temperature of 70°C and a current density of 950A / m 2 , the electrolysis chamber is separated by DuPont 2050 cation exchange membrane, and the ruthenium-plated Ti electrode and the Ni electrode are used as electrolysis anode and cathode respectively;

[0051] (2) after electrolysis for 3h, return the leaching vanadium raw material after concentrating the NaOH solution in the cathode compartment, turn out the anode compartment solution and add ammonium metavanadate to heat and stir, control the NH in the ammonium metavanadate 4+ The molar ratio of V to the anode chamber solution is 1:2.5, the stirring speed ...

Embodiment 3

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

[0055] (2) after electrolysis 6h, the anode chamber solution is turned out and adds ammonium metavanadate to carry out heating and stirring, and controls NH in ammonium metavanadate 4+ The molar ratio of V to the anode chamber solution is 1:1.5, the stirring speed is 100 r / min, and the ammonium polyvanadate is rapidly crystallized and precipitated. After the obtained slurry i...

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Abstract

The invention relates to a method used for preparing ammonium polyorthovanadate from sodium vanadate solution through electrolysis. The method comprises following steps: a sodium vanadate solution isintroduced into an electrolytic tank anode chamber, a NaOH solution is introduced into an electrolytic tank cathode chamber, and electrolysis is carried out, wherein the electrolytic tank anode chamber and the electrolytic tank cathode chamber are isolated by a cation exchange membrane; after electrolysis, the solution in the anode chamber is discharged, and is mixed with ammonium metavanadate forheating reaction, a slurry material obtained through reaction is subjected to solid liquid separation so as to obtain ammonium polyorthovanadate and an ammonium vanadate solution. According to the method, membrane electrolysis is adopted for enrichment of vanadium and recycling of alkali, and ammonium polyorthovanadate products can be directly prepared through adding of ammonium metavanadate, sothat the using amount of ammonium salt in conventional vanadium precipitation technology is reduced greatly, the whole technical process is simple and convenient, vanadium and alkali complete recycling is realized, no waste water is discharged in processing process, clean production and recycling is realized, and excellent economic benefit and promising application prospect are achieved.

Description

technical field [0001] The invention belongs to the field of vanadium product preparation, and in particular relates to a method for utilizing sodium vanadate solution electrolysis to prepare ammonium polyvanadate. Background technique [0002] Ammonium polyvanadate is light yellow crystalline 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 the preparation of vanadium pentoxide and vanadium trioxide. [0003] In industrial production, ammonium polyvanadate is generally prepared from vanadium-containing solution by the method of ammonium salt precipitation. For example, CN106629846A discloses a method for preparing ammonium polyvanadate from sodium roasting leaching solution. The method includes: adding alkaline substances to the sodium roasting leachate, stirring and filtering to obtain sodium vanadate solution; adjusting pH, and then adding Impurity remover, stirring...

Claims

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Application Information

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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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