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A method for producing high-concentration ferrate by step-by-step electrolysis

A ferrate, high concentration technology, applied in the field of electrochemistry, can solve the problems of low ferrate concentration, easy passivation of electrodes, and low current efficiency, and achieve high product concentration, high reaction efficiency, and high current efficiency Effect

Active Publication Date: 2018-12-04
NORTHEAST DIANLI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to comprehensively solve the problems of low current efficiency, low concentration of ferrate, low output and easy passivation of electrodes in the process of electrolytic production of ferrate solution, the present invention provides a method that can relieve iron anode oxidation and improve current efficiency. At the same time, the concentration of ferrate is enriched, and the process method is suitable for large-scale industrial production

Method used

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  • A method for producing high-concentration ferrate by step-by-step electrolysis
  • A method for producing high-concentration ferrate by step-by-step electrolysis
  • A method for producing high-concentration ferrate by step-by-step electrolysis

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Embodiment 1

[0023] Embodiment 1 The structure of the secondary electrolyzer of the present invention

[0024] figure 1 A schematic diagram of the secondary electrolysis device of the present invention is given. Both electrolyzers have the same structure as the electrolyzers of the prior art. The cathodic chamber and the anode chamber are separated by perfluorinated cation exchange membranes, barbed wire or other iron materials are used as anodes, and nickel mesh or other metal materials are used as cathodes. , passing direct current between the anode and cathode. The first-stage electrolytic cell uses sodium hydroxide as the electrolyte, and the second-stage electrolytic cell starts to use the sodium hydroxide and ferrate obtained by electrolysis in the first-stage electrolytic cell as the raw material anolyte, and still uses sodium hydroxide as the catholyte. Continue electrolysis. The raw material anolyte can be transported from the first-stage electrolyzer to the second-stage electr...

Embodiment 2

[0025] Embodiment 2 The structure of the three-stage electrolyzer of the present invention

[0026] figure 2 A schematic diagram of the three-stage electrolysis device of the present invention is given. Three electrolytic cells all have the same structure as the electrolytic cell of the prior art, and the specific structure is the same as that of embodiment 1. The first-stage electrolyzer uses sodium hydroxide as the electrolyte, the second-stage electrolyzer uses the sodium hydroxide and ferrate obtained by electrolysis in the first-stage electrolyzer as raw material anolyte, and the third-stage electrolyzer uses the second-stage electrolyzer The sodium hydroxide and ferrate obtained by electrolysis in the tank are used as the raw material anolyte, and the three electrolytic cells all use sodium hydroxide as the catholyte for electrolysis. The raw material anolyte obtained by the electrolysis of the first and second electrolyzers is transported by a pump, or circulated by ...

Embodiment 3

[0027] Embodiment 3 Production technique of the present invention and the comparison of prior art

[0028] Using electrolyzers and electrodes of the same structure and size, under the same current and water bath temperature, under the same electrolyte volume flow rate, that is, the same output, using the production device technology of the present invention, the product concentration is the same as that of the original first-level electrolysis About 2 times more than the tank process. For example a secondary or tertiary electrolytic process of the present invention (asfigure 1 , figure 2 ) compared with the original one-stage electrolysis process: the anode volume of the electrolytic cell is 150mL, at 48°C, the current density is 40mA / cm 2 , the material flow rate of the anolyte is 2.5mL / min, that is, the residence time in the anode chamber of each electrolytic cell is 1 hour, and with electrodes of the same material, structure, and size, regardless of whether the primary, s...

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Abstract

The invention discloses a method for producing high-concentration ferrate through a step-by-step electrolytic process, and belongs to the technical field of electrochemistry. Two or more stages of electrolytic baths are adopted. After first-stage electrolytic production is carried out in the first-stage electrolytic bath. Ferrate products in an anode chamber flow into an anode chamber of the second-stage electrolytic bath for second-stage electrolysis, and in this way, more stages of electrolytic baths can be sequentially connected in series for electrolysis. A filtering or cooling device can be added in the middle of each stage of electrolytic bath. Accordingly, ferrate is produced through two or more stages of electrolytic reaction, and the problems that the product concentration is low and production efficiency is low when ferrate is produced through the electrolytic process can be simultaneously solved. The method is efficient, easy and convenient to implement, and capable of being used for producing high-concentration liquid ferrate or producing crystal ferrate.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a process for preparing liquid ferrate by electrolysis. Background technique [0002] Ferrate is a hexavalent iron salt, which has both oxidation and flocculation functions. It has multiple functions such as disinfection, algae killing, decolorization, and deodorization in water treatment. It is a recognized "green" water treatment agent. Under acidic and alkaline conditions, ferrate has stronger oxidizing properties than permanganate and dichromate, and its reaction product, ferric hydroxide, also has adsorption and flocculation effects. Compared with chlorine-containing disinfectants, the use of ferrate for water treatment does not produce harmful substances such as chlorinated alkanes and chlorophenols, nor does it produce harmful ions and harmful derivatives, and is safer. With the increasing emphasis on the use and treatment of water in modern society, people are in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00C25B9/18
CPCC25B1/00C25B9/70
Inventor 孙旭辉齐原
Owner NORTHEAST DIANLI UNIVERSITY
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