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Electrode and preparation method and application thereof

An electrode and anode technology, applied in the field of electrodes, can solve the problems of increased cell voltage, high cost, and reduced current efficiency.

Active Publication Date: 2018-05-18
JIANGYIN ANCAN ELECTROCHEM EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the electrolytic production of chlorate, the coated electrode of Ru-Ti or Ru-Ir-Ti is traditionally used as the anode, that is, the electrode substrate (such as titanium) is coated with a mixed oxide coating of ruthenium and titanium or coated with ruthenium , iridium and titanium mixed oxide coating, Ru-Ti is low in cost, the current efficiency is 97%, and the service life is 3-4 years. Ru-Ir-Ti has higher corrosion resistance, and the service life is 7-8 years, but High cost, 96% current efficiency
In actual production, since the electrolyte contains Fe 3+ and PO 4 3- Ions, the above-mentioned coated electrodes all have deposited FePO during the production process 4 The problem of reducing the current efficiency and increasing the voltage of the cell makes the chlorate production enterprises stop production every 1-3 months to remove the FePO on the surface of the anode 4

Method used

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  • Electrode and preparation method and application thereof
  • Electrode and preparation method and application thereof
  • Electrode and preparation method and application thereof

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preparation example Construction

[0023] The preparation method of the upper electrode includes coating the precursor compounds of ruthenium, titanium and lead and / or tantalum on the surface of the electrode substrate, and decomposing through sintering to obtain the electrode.

[0024] Preferably, the precursor compounds of ruthenium, titanium and lead and / or tantalum are dissolved in a solvent to obtain a coating liquid, and then the coating liquid is coated on the surface of the electrode substrate. Coating methods can be spray coating, dip coating or spin coating.

[0025] Preferably, the precursor compounds of ruthenium, titanium and lead and / or tantalum are ruthenium nitrate, ruthenium trichloride, titanium tetrachloride, butyl titanate, lead acetate and tantalum pentachloride.

[0026] Preferably, the sintering temperature is 400-600° C. for 5-60 minutes.

[0027] Application of the above electrode as an anode for the electrolytic production of chlorate.

[0028] An electrolytic cell for producing chlo...

Embodiment 1

[0032] According to Ru:Pb:Ti=25%:20%:55% (mass percentage), ruthenium nitrate, butyl titanate and lead acetate are dissolved in ethylene glycol to prepare a coating solution, and the coating solution is coated on the titanium electrode substrate (Each coating amount is 15-20ml / m 2 ), after coating, it is dried at 100°C for 60 minutes, and then fired at 400°C for 60 minutes. During the firing process, O 2 To provide an oxygen-rich atmosphere (to ensure that ruthenium nitrate, butyl titanate and lead acetate are completely thermally decomposed and converted into corresponding oxides), repeat the above action 10-20 times to control the load of ruthenium oxide (calculated as Ru) on the titanium electrode substrate The amount is 10g / m 2 .

Embodiment 2

[0034] Press Ru:Pb:Ta:Ti=20%:20%:15%:45% (mass percentage), dissolve ruthenium trichloride, titanium tetrachloride, lead acetate and tantalum pentachloride by ethylene glycol, make coating liquid, coating the coating liquid on the titanium electrode substrate (each coating amount is 15-20ml / m 2 ), after coating, it was dried at 120°C for 60 minutes, then fired at 600°C for 5 minutes, and O 2 , repeat the above action 10-20 times, control the load of ruthenium oxide (calculated as Ru) on the titanium electrode substrate to be 5g / m 2 .

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Abstract

The invention discloses an electrode. The electrode comprises an electrode substrate and a coating covering the surface of the electrode substrate; the coating is composed of oxides of ruthenium, titanium, lead or / and tantalum; the coating comprises the following oxides of, by weight, 20-30% of the ruthenium oxide by Ru, 10-55% of the titanium oxide by Ti, and the balance lead and / or tantalum oxides; wherein the mass percent content of the lead oxide is recorded by Pb, the mass percent of the tantalum oxide is recorded by TA. According to the electrode, the problem that the coating electrodesof existing Ru-Ti or Ru-Ir-Ti are easy to deposit FePO4 in the electrolysis production of chlorate is overcome, so that the influence on production caused by FePO4 deposition is reduced.

Description

technical field [0001] The present invention relates to an electrode, and more particularly to an electrode for the electrolytic production of chlorate. Background technique [0002] Chlorates are important chemicals widely used as raw materials for chlorine dioxide for bleaching. Chlorate is usually obtained by electrolysis of the corresponding chloride, and the reaction process of electrolysis is: MCl+H 2 O→MClO 3 +H 2 , M is a metal ion, such as an alkali metal ion. [0003] In the electrolytic production of chlorate, the coated electrode of Ru-Ti or Ru-Ir-Ti is traditionally used as the anode, that is, the electrode substrate (such as titanium) is coated with a mixed oxide coating of ruthenium and titanium or coated with ruthenium , iridium and titanium mixed oxide coating, Ru-Ti is low in cost, the current efficiency is 97%, and the service life is 3-4 years. Ru-Ir-Ti has higher corrosion resistance, and the service life is 7-8 years, but High cost, 96% current eff...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B1/26
CPCC25B1/265C25B11/051C25B11/093
Inventor 徐坚唐宏陈晓丽
Owner JIANGYIN ANCAN ELECTROCHEM EQUIP