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Method for preparing solid state powder of potassium ferrate by adopting one-step method and electricity chemistry

A potassium ferrate, solid powder technology, applied in the electrolysis process, electrolysis components, electrode shape/type and other directions, can solve the problems of low current efficiency, etc., and achieve the effects of high space-time efficiency, simple additive composition, and safe production process

Inactive Publication Date: 2009-09-09
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is the low current efficiency at high current densities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] First, 14.5mol / L KOH solution is added to the electrolytic cell as the anolyte and catholyte respectively. The anode uses 10 layers of ordinary wire mesh with an iron content above 98%, and the effective surface area of ​​immersion is 600cm 2 , the cathode is a planar area of ​​10 × 10cm 2 Nickel foam; the anolyte volume is 90mL, and then add 1.5mL sodium hydroxide solution containing 0.16mol / L potassium iodate additive to the anolyte; the electrolytic cell is placed in a 65°C water bath at constant temperature, and electrolyzed at 0.60A constant DC for 8.75 hours Finish. The tank voltage ranges from 1.7 to 1.9V. After the electrolysis, the anolyte was taken out, separated by suction filtration, dehydrated and dealkalized, and the filter cake was dried in a vacuum oven at 80°C for 1.5 hours. got K 2 FeO 4 The solid is 5.09g, the purity is 97.6%, the current efficiency is 79.6%, and the electrosynthesis rate is 6.3g.L -1 .h -1 , power consumption 1.9kWh / (kg K 2 Fe...

Embodiment 2

[0037] First, 14.5mol / L KOH solution is added to the electrolytic cell as anolyte and catholyte respectively, and the anode adopts 10 layers of ordinary barbed wire with an iron content above 98%, and the effective surface area is 600cm 2 , the cathode is a planar area of ​​10 × 10cm 2 Nickel foam. The volume of the anolyte is 90mL, and then 2mL of sodium hydroxide solution containing 0.16mol / L potassium iodate is added to the anolyte. The electrolytic cell was placed in a constant temperature water bath at 65°C and electrolyzed at 1.50A constant direct current for 3.50 hours to end. The tank voltage ranges from 2.0 to 2.2V. After the electrolysis, the anolyte was taken out, separated by suction filtration, dehydrated and dealkalized, and the filter cake was dried in a vacuum oven at 80°C for 1.5 hours. got K 2 FeO 4 Solid 4.86g, purity 97.5%, current efficiency 76.2%, electrosynthesis rate 15.5g.L -1 .h -1 , power consumption 2.3kWh / (kg K 2 FeO 4 ).

Embodiment 3

[0039] First, 14.5mol / L KOH solution is added to the electrolytic cell as anolyte and catholyte respectively, and the anode adopts 10 layers of ordinary barbed wire with an iron content above 98%, and the effective surface area is 600cm 2 , the cathode is a planar area of ​​10 × 10cm 2 Nickel foam; anolyte volume 90mL, then add 0.39mmol solid potassium iodate to the anolyte. The electrolytic cell was placed in a 65°C water bath at a constant temperature, and the electrolysis was completed at 2.50A constant direct current for 2.10 hours. The tank voltage ranges from 2.2 to 2.4V. After the electrolysis, the anolyte was taken out, separated by suction filtration, dehydrated and dealkalized, and the filter cake was dried in a vacuum oven at 80°C for 1.5 hours. got K 2 FeO 4 Solid 4.39g, purity 96.7%, current efficiency 67.5%, electrosynthesis rate 23.1g.L -1 .h -1 , power consumption 2.75kWh / (kg K 2 FeO 4 ).

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Abstract

The invention provides a method for preparing solid state powder of potassium ferrate by adopting a one-step method and electricity chemistry; a diaphragm type electrobath can directly prepare the solid state powder of potassium ferrate with the purity of 94.0%-98.1% with anodes of electrolytic irons with the direct current density of 0.10-0.42 A / dm<2> by the one-step method in a concentrated potassium hydroxide solution containing additive, the corresponding current efficiency is 79.6%-67.5%, and the electric power consumption is 1.9-2.8 kWh / (kg K2FeO4). The product prepared by the invention is suitable for serving as a high-effective water treatment agent, organic synthetic oxidizer and anode active material of alkaline super-iron battery; the method can be used for continuous raw material production, has high efficiency and low cost; the electrolyte can be recycled and has no pollution to environment.

Description

technical field [0001] The invention belongs to the preparation technology of ferrate, in particular to a method for electrochemically preparing potassium ferrate (K 2 FeO 4 ) method of solid powder. Background technique [0002] Ferrate is a kind of oxidizing agent with excellent performance. Among them, K 2 FeO 4 (or Na 2 FeO 4 ) As a water treatment agent, it has the synergistic function of oxidation, adsorption and flocculation to remove pollutants and has a stronger sterilization and disinfection effect than chlorine-based oxidants. The reaction product is iron oxide or iron hydroxide, which will not cause secondary pollution and will not damage the atmospheric ozone layer. It is the best choice to replace the current chlorine water purifier. K 2 FeO 4 And other ferrates have many unique properties as oxidants, and have high selectivity and wide adaptability to many organic reactions. K 2 FeO 4 Or other ferrates as positive electrode materials for environmen...

Claims

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Application Information

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IPC IPC(8): C25B1/14C25B13/02C25B13/04C25B11/03
Inventor 何伟春
Owner HENAN UNIVERSITY OF TECHNOLOGY
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