Method for decreasing pH (potential of hydrogen) value of vanadium precipitation qualified liquid

A vanadium-precipitating qualified liquid and qualified liquid technology, which is applied in the electrolysis process, electrolytic components, etc.

Inactive Publication Date: 2013-03-06
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The various improvements to the vanadium precipitation process involved in the prior art mostly focus on the process of ammonium salt vanadium precipitation and the treatment o

Method used

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  • Method for decreasing pH (potential of hydrogen) value of vanadium precipitation qualified liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] in such as figure 1The ion-exchange membrane electrolysis device shown performs electrolysis, and the cation-exchange membrane used is a perfluorinated ion-exchange membrane purchased from Asahi Glass Co., Ltd., model number F-8020SP. Among them, 500mL of vanadium-precipitating qualified liquid containing 38.25g / L of vanadium and a pH value greater than 14 is introduced into the anode chamber through pump A, and 500mL of sodium hydroxide solution with a concentration of 0.2% by weight is introduced into the cathode chamber through pump B, and the voltage is controlled. At 5-12V, with a current of 0.05-1.45A, the pH of the solution in the anode compartment reached 2 within 10 hours.

Embodiment 2

[0032] in such as figure 1 The ion-exchange membrane electrolysis device shown performs electrolysis, and the cation-exchange membrane used is the cation-exchange membrane of Zhejiang Qianqiu Environmental Protection Water Treatment Co., Ltd. Among them, 500mL of vanadium-precipitating qualified liquid containing 38.25g / L of vanadium and a pH value greater than 14 is introduced into the anode chamber through pump A, and 500mL of sodium hydroxide solution with a concentration of 0.1% by weight is introduced into the cathode chamber through pump B, and the voltage is controlled. At 5-10V, with a current of 0.05-1.45A, the pH of the solution in the anode compartment reached 2 within 12 hours.

Embodiment 3

[0034] in such as figure 1 The shown ion membrane electrolysis device performs electrolysis, and the cation exchange membrane used is the Nafion117 ion membrane of DuPont Company. Among them, 500mL of vanadium-precipitating qualified liquid containing 38.25g / L of vanadium and a pH value greater than 14 is introduced into the anode chamber through pump A, and 500mL of sodium hydroxide solution with a concentration of 0.5% by weight is introduced into the cathode chamber through pump B, and the voltage is controlled. At 5-15V, with a current of 0.05-1.45A, the pH of the solution in the anode compartment reached 2 within 9 hours.

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Abstract

The invention provides a method for decreasing a pH (potential of hydrogen) value of vanadium precipitation qualified liquid. The method is characterized by including: under the condition of ion-exchange membrane electrolysis, introducing the vanadium precipitation qualified liquid into an anode chamber of an ion-exchange membrane electrolyzer, and introducing electrolyte water solution into a cathode chamber of the ion-exchange membrane electrolyzer so that ion-exchange membrane electrolysis is performed. By the method, the pH value of the vanadium precipitation qualified liquid is decreased while acid radical negative ions cannot be introduced. During electrolysis, the vanadium precipitation qualified liquid is disposed in the anode chamber, water of the anode chamber is electrolyzed to oxygen and hydrogen ions, water of the cathode chamber is electrolyzed to hydrogen and hydroxyl ions, sodions in vanadate in the anode chamber enter the cathode chamber by penetrating through a positive ion membrane, the sodions and the hydroxyl ions produced in the cathode chamber produce sodium hydroxide, vanadate ions are retained in the anode chamber, and the vanadate ions and the hydroxyl ions produced in the anode chamber are combined into vanadic acid (or acidic vanadate). Therefore, the purpose of decreasing the pH value of the vanadium precipitation qualified liquid in a non-acid manner is achieved by means of ion-exchange membrane electrolysis.

Description

technical field [0001] The invention relates to a method for lowering the pH value of qualified solution for vanadium precipitation. Background technique [0002] In the traditional production of vanadium oxide, the process of sodium salt roasting and ammonium salt vanadium precipitation is usually adopted. Vanadium can exist in a variety of aggregation states in solution, and the composition of various vanadium compounds is different. The existence state of vanadium in the solution has a great relationship with the pH value of the solution. Therefore, in the existing vanadium precipitation process, the pH value of the vanadium solution (qualified vanadium precipitation solution) is first adjusted to change the polymerization state of vanadium, and then ammonium salt is added for precipitation. [0003] At present, the general method to adjust the pH value of the vanadium precipitation qualified solution is to add inorganic acid, such as sulfuric acid. The various improve...

Claims

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Application Information

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IPC IPC(8): C25B1/10C22B34/22
CPCY02E60/366Y02E60/36
Inventor 李千文马伟刘丰强程子洪王小江王天罡王英宋小燕
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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