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Chlorine evolution anode

a technology of chlorine evolution and anode, applied in the field of chlorine evolution anode, can solve the problems of increasing the potential of the anode, increasing the electrolytic voltage, and reducing the service life and durability of the anod

Inactive Publication Date: 2014-08-21
DOSHISHA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides various technical effects that include reducing the chlorine evolution potential, restraining side reactions, eliminating or reducing the work to remove the oxide or other chemical compounds, decreasing the distance between the anode and the cathode, preventing metal growth, and reducing the cost of the anode and the process of forming the catalytic layer. These effects allow for stable electrolysis with reduced energy consumption, prolonged anode service life, and decreased maintenance and replacement of the anode.

Problems solved by technology

However, since cobalt oxyhydroxide has a low catalytic activity for chlorine evolution, it inhibits the chlorine evolution reaction on the anode, increases a potential of the anode as a result, and causes an increase in electrolytic voltage.
The above-described deposition and accumulation of a metal oxide on the anode due to the side reaction raise the electrolytic voltage and at the same time cause a reduction in service life and durability of the anode.

Method used

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  • Chlorine evolution anode

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0052]A commercially available titanium plate (5 cm in length, 1 cm in width, 1 mm in thickness) was immersed and etched in a 10% oxalic acid solution at 90° C. for 60 minutes and then washed and dried. Next, prepared was a coating solution which was obtained by adding ruthenium trichloride trihydrate (RuCl3.3H2O) and tantalum pentachloride (TaCl5) to a butanol (n-C4H9OH) solution containing 6 vol % concentrated hydrochloric acid so that the mole ratio of ruthenium to tantalum is 90:10 and the total of ruthenium and tantalum is 50 g / L in terms of metal. This coating solution was applied to the titanium plate dried as mentioned above, dried at 120° C. for 10 minutes, and then thermally decomposed for 20 minutes in an electric furnace that was held at 260° C. This series of application, drying, and thermal decomposition was repeated five times in total in order to prepare a chlorine evolution anode of Example 1, the anode having a catalytic layer formed on the titanium plate that was ...

example 2

[0064]A commercially available titanium plate (5 cm in length, 1 cm in width, 1 mm in thickness) was immersed and etched in a 10% oxalic acid solution at 90° C. for 60 minutes and then washed and dried. Next, prepared was a coating solution which was obtained by adding ruthenium trichloride trihydrate (RuCl3.3H2O) and tantalum pentachloride (TaCl5) to a butanol (n-C4H9OH) solution containing 6 vol % concentrated hydrochloric acid so that a mole ratio of ruthenium to tantalum was 30:70 and a total of ruthenium and tantalum was 50 g / L in terms of metal. This coating solution was applied to the titanium plate dried as mentioned above, dried at 120° C. for 10 minutes and then, thermally decomposed for 20 minutes in an electric furnace that was held at 280° C. This series of application, drying and thermal decomposition was repeated five times in total in order to prepare a chlorine evolution anode in which a catalytic layer was formed on the titanium plate that was a conductive substrat...

example 3

[0069]The chlorine evolution anode of Example 2 was used to measure cyclic voltammograms under the same conditions except that the cobalt electrowinning solution of Example 2 was changed to a hydrochloric acid electrolytic solution, the pH of which was adjusted to 1.6 by adding only hydrochloric acid to distilled water and the scan rate was changed to 50 mV / s.

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Abstract

Provided is a chlorine evolution anode in which a main reaction of the anode is chlorine evolution, and the chlorine evolution anode which is low in potential of the anode for chlorine evolution, thereby being able to decrease an electrolytic voltage and lower an electric energy consumption rate. The chlorine evolution anode of the present invention is a chlorine evolution anode in which chlorine evolution from an aqueous solution is a main reaction of the anode and also in which a catalytic layer containing amorphous ruthenium oxide and amorphous tantalum oxide is formed on a conductive substrate.

Description

TECHNICAL FIELD[0001]The present invention relates to a chlorine evolution anode which is used in electrowinning a desired metal at a cathode by electrolysis and also to a chlorine evolution anode which is used in generating chlorine from a chloride based aqueous solution by brine electrolysis, hydrochloric acid electrolysis, sea water electrolysis, etc. More specifically, the present invention relates to a chlorine evolution anode which is used in electrowinning, brine electrolysis, hydrochloric acid electrolysis, sea water electrolysis, etc., in which an aqueous solution is used as an electrolytic solution and a main reaction of the anode is generation of chlorine.BACKGROUND ART[0002]Electrowinning is performed by a current flow between an anode and a cathode placed in an aqueous solution which contains ions of a metal to be extracted (hereinafter, referred to as an electrowinning solution), thereby depositing the metal on the cathode. Electrowinning includes a method for producin...

Claims

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Application Information

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IPC IPC(8): C25B11/04C25C7/02
CPCC25C7/02C25B11/0484C02F1/4674C02F2001/46142C02F2103/08C25B1/26C02F2001/46147C25B11/051C25B11/093C25B11/097
Inventor MORIMITSU, MASATSUGU
Owner DOSHISHA CO LTD
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