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Method for producing high-concentration ferrate through step-by-step electrolytic process

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

Active Publication Date: 2017-06-27
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for producing high-concentration ferrate through step-by-step electrolytic process
  • Method for producing high-concentration ferrate through step-by-step electrolytic process
  • Method for producing high-concentration ferrate through step-by-step electrolytic process

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1 The structure of the secondary electrolytic cell of the present invention

[0025] figure 1 A schematic diagram of the secondary electrolysis device of the present invention is given. Both electrolyzers have the same structure as the prior art electrolyzers. Perfluorinated cation exchange membranes are used to separate the cathode chamber and the anode chamber. Wire mesh or other iron materials are used as anodes, and nickel mesh or other metal materials are used as cathodes. , Direct current is applied between the anode and the cathode. The first-level electrolyzer uses sodium hydroxide as the electrolyte, and the second-level electrolyzer starts to use the sodium hydroxide and ferrate obtained by electrolysis in the first-level electrolyzer 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 electrolytic cell to the second-stage electrolytic cell...

Embodiment 2

[0026] Example 2 The structure of the three-stage electrolytic cell of the present invention

[0027] figure 2 A schematic diagram of the three-stage electrolysis device of the present invention is given. The three electrolytic cells 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-level electrolyzer uses sodium hydroxide as the electrolyte, the second-level electrolyzer uses the sodium hydroxide and ferrate obtained by electrolysis in the first-level electrolyzer as raw material anolyte, and the third-level electrolyzer uses the second-level electrolysis The sodium hydroxide and ferrate obtained by electrolysis in the tank are used as the raw anolyte, and the three electrolytic tanks all use sodium hydroxide as the catholyte for electrolysis. The raw material anolyte obtained by the electrolysis of the first and second stage electrolyzers is transported by a pump, or circulated by heigh...

Embodiment 3

[0028] Example 3 Comparison between the production process of the present invention and the prior art

[0029] Using the same structure and size of the electrolysis cell and electrode, under the same current and bath temperature, under the same electrolyte volume flow, that is, the same output, using the production device process of the present invention, the product concentration is the original primary electrolysis The groove process is about twice or more. For example, a secondary or tertiary electrolysis process of the present invention (such as figure 1 , figure 2 ) The experimental results compared with the original first-level electrolysis process: the anode volume of the electrolytic cell is 150mL, and the current density is 40mA / cm at 48℃ 2 , The anolyte material flow rate is 2.5mL / min, that is, the residence time in the anode compartment of each electrolytic cell is 1 hour. With electrodes of the same material, structure and size, no matter the first, second or third st...

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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 kind of hexavalent iron salt that has both oxidation and flocculation effects. It has many functions such as disinfection, algae killing, decolorization and deodorization in water treatment. It is recognized as a "green" water treatment agent. Under acidic and alkaline conditions, ferrate has stronger oxidizing properties than permanganate and dichromate, and its reaction product ferric hydroxide has adsorption and flocculation effects. Compared with chlorine-containing disinfectants, the use of ferrate for water treatment will not produce harmful substances such as chlorinated alkanes and chlorophenols, and will not produce harmful ions and harmful derivatives, which is more safe. With the increasing emphasis of modern society on the use and treatment of water, people urgently ne...

Claims

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Application Information

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