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Solid potassium ferrate preparing method

A potassium ferrate and solid technology, applied in the electrolysis process, electrolysis components, etc., can solve the problems of increased process, reduced yield of ferrate, low purity and current efficiency, etc., easy to achieve process parameters, less production process, and space-time efficiency high effect

Inactive Publication Date: 2005-12-28
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only increases the number of procedures and reduces the yield of ferrate, but more seriously produces a large amount of KOH and NaOH mixed alkali solution, and this mixed alkali solution cannot be recycled for NaOH 2 FeO 4 The preparation stage of the solution, otherwise the utilization rate of hypochlorite or electric current will be reduced
In order to overcome this situation, a recently reported method using KOH, NaOH mixed alkali solution as the anolyte to electrolyze the iron anode to directly prepare solid K 2 FeO 4 method (Electrochemistry.Communication, 4, 2002, 764-766), but on the one hand, this article does not disclose detailed process parameters, on the other hand, the prepared solid K 2 FeO 4 The purity and current efficiency of the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Use a PVC square diaphragm electrolyzer, the volume of the anode chamber is 10×10×5cm 3 , the volume of the cathode chamber is 10×10×2cm 3 , the diaphragm is an effective area of ​​7 × 12cm 2 perfluorinated cationic membrane. The anode is 32 layers with an effective apparent area of ​​40cm 2 30 mesh ordinary braided iron mesh (wire diameter d = 0.14mm), the effective apparent area of ​​the cathode is 40cm 2 nickel foam. The anolyte volume is 200ml, and the catholyte volume is 100ml. Both anolyte and catholyte are 13M KOH solution. Add 2.5ml additive solution to the anolyte, CuCl in the additive solution 2 、KIO 3 、Na 2 SiO 3 The concentrations of , KI, and KOH are 0.015M, 0.015M, 0.3M, 0.015M, and 5M, respectively. The electrolytic cell was placed in a constant temperature water bath with an initial temperature of 60°C, and the temperature stabilized at 65°C after the current was applied for about half an hour. Vigorously stir the anolyte with an electric stir...

Embodiment 2

[0037] The K obtained by the method described in Example 1 with a purity of 95% 2 FeO 4 20 g of the solid was dissolved in 200 ml of 7M NaOH solution under ice-bath conditions. After vacuum filtration through a sand core funnel, the concentration of ferrate in the filtrate was determined to be 0.47M by the chromate method. Under the condition of ice bath, 20mL of filtrate and 10mL of saturated KOH were successively mixed in the same suction filter bottle through a sand core funnel, and reacted for 2 to 3min to make a mixture containing solid K 2 FeO 4 Seed mother liquor. Under the condition of magnetic stirring, add the remaining 180mL filtrate and 90mL saturated KOH solution alternately into the suction filtration flask at the speed of 5-8mL / min and 2.5-4mL / min respectively, keep the solution temperature below 20°C, and the whole feeding process is at 20°C. Complete within ~30min, then continue to stir for 5min. The K obtained from the reaction in the filter flask 2 FeO ...

Embodiment 3

[0039] Use a PVC square diaphragm electrolyzer, the volume of the anode chamber is 10×10×5cm 3 , the volume of the cathode chamber is 10×10×2cm 3 . The diaphragm is an effective area of ​​7 x 12cm 2 perfluorinated anion membrane. The anode is 32 layers with an effective apparent area of ​​40cm 2 30 mesh ordinary braided iron mesh (wire diameter d = 0.14mm), the effective apparent area of ​​the cathode is 40cm 2 nickel foam. The anolyte volume is 200ml, and the catholyte volume is 100ml. Both anolyte and catholyte are 13M KOH solution. Add 2.5ml additive solution to the anolyte, CuCl in the additive solution 2 、KIO 3 、Na 2 SiO 3 The concentrations of , KI, and KOH are 0.015M, 0.015M, 0.3M, 0.015M, and 5M, respectively. The electrolytic cell is placed in a constant temperature water bath, the initial temperature is 60°C, and the temperature stabilizes at 66°C after the current is applied for about half an hour. Vigorously stir the anolyte with an electric stirrer, el...

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Abstract

The present invention provides a method for preparing solid K without using any chemical oxidant 2 FeO 4 Methods. That is, using a diaphragm electrolytic cell, in a KOH solution containing a stabilizer, and direct current electrolysis, the iron-containing material electrode is directly anodized in one step to directly obtain a solid K with a purity greater than 90wt%. 2 FeO 4 . The solid K prepared by this method 2 FeO 4 It can be used as a treatment agent for sewage or drinking water and an oxidant for organic synthesis. It can also be used as a positive electrode active material for alkaline ferrate batteries after being purified. The process of the invention can run continuously, the electrolyte can be recycled, has high efficiency, low cost and no pollution.

Description

Technical field [0001] The invention belongs to the preparation technology of ferrate, be specifically related to solid potassium ferrate (K 2 FeO 4 ) preparation method. Background technique [0002] Ferrate, which has strong oxidizing properties, has attracted more and more attention because of its unique environment-friendly characteristics. As a treatment agent for sewage and drinking water, it does not have the "three hazards" of chlorine-containing disinfectants; as an organic synthesis oxidant, it does not have secondary pollution caused by permanganate or dichromate reduction products; as an alkaline battery positive electrode The active material not only has the advantages of environmental friendliness and abundant resources, but also has high voltage and large capacity. However, there is currently no preparation process suitable for industrial production in terms of economy, scale, and product form, which slows down the application of ferrate in various fields. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00C25B1/14
Inventor 杨长春高杰
Owner ZHENGZHOU UNIV
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