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Process for producing potassium permanganate doped potassium ferrate

A technology of potassium permanganate and potassium ferrate, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of poor stability of potassium ferrate, low yield of potassium ferrate, thermal decomposition, etc. The effect of good chemical properties, high discharge specific capacity, and good stability

Inactive Publication Date: 2009-05-13
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the prior art can improve the stability of potassium ferrate in the synthesis process to a certain extent, the synthesized solid potassium ferrate is still easy to absorb moisture and be decomposed by heat; Severe discharge and poor cycle performance; the existing technology obviously cannot fundamentally improve the stability of potassium ferrate and improve the electrochemical performance of high-iron batteries
[0005] Although potassium ferrate has many excellent characteristics and wide application prospects, due to the low yield of synthetic potassium ferrate in the prior art, the poor stability of the potassium ferrate synthesized in the prior art, it is difficult to transport and long-term storage and other factors, So far, the large-scale industrialization and wide application of potassium ferrate have not really been formed.

Method used

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  • Process for producing potassium permanganate doped potassium ferrate
  • Process for producing potassium permanganate doped potassium ferrate
  • Process for producing potassium permanganate doped potassium ferrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The first step mixes ferric nitrate and sodium silicate uniformly in a ratio of 1:0.005 in molar ratio of iron to sodium silicate;

[0034] The second step is that the above mixture is dissolved in a concentration of 3.0M potassium hydroxide solution;

[0035] In the third step, under the condition of stirring, the potassium hypochlorite solution containing the same concentration of KOH as the second step is added to the above potassium hydroxide solution in a ratio of 1:3 by the molar ratio of Fe and potassium hypochlorite, and the temperature is controlled at 0°C. React for 10 minutes, filter under reduced pressure under the condition of less than 100Kpa, and separate the purple suspended solid product prepared by the reaction;

[0036] The fourth step dissolves the above-mentioned purple solid product in a mixed solution of potassium hydroxide (concentration is 3.0M) and potassium permanganate (concentration is 5.0g / L) whose volume is 0.2 times the volume of the reac...

Embodiment 2

[0040] The first step ferric chloride and cupric chloride are mixed evenly in the ratio of 1:0.008 by the mol ratio of ferric ion and copper ion;

[0041] The second step is that the above mixture is dissolved in a concentration of 4.0M potassium hydroxide solution;

[0042] In the third step, under the condition of stirring, add the sodium persulfate solution containing the same concentration KOH as the second step in the ratio of 1:4 by the molar ratio of Fe and sodium persulfate to the above potassium hydroxide solution, and the temperature is controlled at 45 ℃, react for 20 minutes, separate the purple suspended solid product prepared by the reaction, and filter under reduced pressure under the condition of less than 100Kpa;

[0043] In the 4th step, the above-mentioned purple solid product is mixed with a mixed solution of potassium hydroxide (concentration is 12.0M) and potassium permanganate (concentration is 1.0g / L) that is 0.25 times the volume of the reaction system...

Embodiment 3

[0047] The first step mixes ferric nitrate and sodium silicate uniformly in a ratio of 1:0.01 in molar ratio between iron and sodium silicate;

[0048] The second step is that the above mixture is dissolved in a potassium hydroxide solution with a concentration of 6.0M;

[0049] In the third step, under the condition of stirring, the sodium hypochlorite solution containing the same concentration of KOH as the second step is added to the above potassium hydroxide solution in a ratio of 1:6 by the molar ratio of Fe and sodium hypochlorite, and the temperature is controlled at 25 ° C. The reaction is 45 Minutes, filter under reduced pressure less than 100Kpa, separate the purple suspended solid product prepared by the reaction;

[0050] In the 4th step, the above-mentioned purple solid product is mixed with a mixed solution of potassium hydroxide (concentration is 6.0M) and potassium permanganate (concentration is 25.0g / L) that is 1.5 times the volume of the reaction system solut...

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Abstract

The invention discloses a method for preparing potassium permanganate-doped potassium ferrate. The method comprises the following steps: firstly, mixing a ferrous compound and a stabilizer by the proportion of Fe and the stabilizer; secondly, dissolving the mixture in a potassium hydroxide solution; thirdly, stirring, adding an oxidizer to the potassium hydroxide solution by a certain proportion of Fe and the oxidizer at the temperature controlled within a certain range, reacting for a certain time, separating the purple suspended solid product prepared from the reaction, decompressing and filtering; fourthly, mixing the purple solid product with the mixed solution of potassium hydroxide and potassium permanganate in a certain proportion, stirring and separating the purple solid to obtain the purple solid product; and fifthly, rinsing the purple solid product with cyclohexane, absolute alcohol and ether respectively, decompressing and filtering, and vacuum drying until the weight is constant to obtain the potassium ferrate solid. The invention has the advantages that the purity of synthesis is high, the thermal stability of the synthesis is high, the purity of potassium ferrate is higher than 98%, the content of the potassium ferrate is higher than 96%; the obtained potassium ferrate has good electrochemical performance; and the conservation rate of the charge / discharge cycle discharge capacity is up to 90.5%.

Description

technical field [0001] The invention relates to the fields of water treatment agent and chemical power supply manufacturing, and more specifically relates to a preparation method of potassium ferrate doped with potassium permanganate. The potassium permanganate-doped potassium ferrate prepared by the invention can be used as a water treatment agent, a positive electrode active material of a chemical power source, and can also be used as an oxidant for organic synthesis. Background technique [0002] Potassium ferrate has strong oxidizing properties and high standard electrode potential (its standard electrode potential E 0 =0.77V). Potassium ferrate can oxidize many organic pollutants in various media, and its reduction product colloidal ferric hydroxide can simultaneously remove lead, cadmium, mercury and other heavy metal ion pollutants through adsorption and flocculation, so it is widely used in It is a new, efficient and safe multi-functional water treatment agent that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
Inventor 周环波程凡胡远强葛杏莉库宗军
Owner STATE GRID CORP OF CHINA
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