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Method for preparing steady composite potassium ferrate solution

A potassium ferrate and solution technology, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve problems such as preparation process optimization and screening, and achieve the effects of long storage time, difficult reduction of high iron content, and good stability.

Inactive Publication Date: 2008-12-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The document "The Stabilizing Effect of Hypochlorite on Ferrate Solution" (Jia Handong et al., Inorganic Salt Industry) affirmed the stabilizing effect of hypochlorite on ferrate, but did not optimize and screen its preparation process

Method used

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  • Method for preparing steady composite potassium ferrate solution
  • Method for preparing steady composite potassium ferrate solution
  • Method for preparing steady composite potassium ferrate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 120ml of 1.4mol / L sodium hypochlorite and 45.0g of sodium hydroxide in a reactor, control the temperature below 30°C with a water bath, suction filter after white matter is formed, and the obtained liquid is saturated alkaline sodium hypochlorite. Slowly add 25.1 g of finely ground ferric nitrate into the above liquid and stir, and control the reaction temperature at 25-35°C. After reacting for 1.5 hours, filter with suction to obtain sodium ferrate liquid. Add 40ml of saturated potassium hydroxide to the sodium ferrate solution, and stir for 10-15 minutes to obtain a composite potassium ferrate solution. Finally, add 1.7g of calcium hypochlorite, control the temperature in a water bath at 10-20°C, and stir for 10-20 minutes to obtain a stable composite potassium ferrate solution with a concentration of 0.16mol / L.

Embodiment 2

[0022] Take 180ml of 1.4mol / L sodium hypochlorite and 90.0g of sodium hydroxide in a reactor, control the temperature below 30°C with a water bath, and suction filter after white matter is formed, the obtained liquid is saturated alkaline sodium hypochlorite. Slowly add 40.1 g of finely ground ferric nitrate into the above liquid and stir, and control the reaction temperature at 25-35°C. After reacting for 1.5 hours, filter with suction to obtain sodium ferrate liquid. Add 40ml of saturated potassium hydroxide to the sodium ferrate solution, and stir for 10-15 minutes to obtain a composite potassium ferrate solution. Finally, add 2.5g of calcium hypochlorite, control the temperature in a water bath at 10-20°C, and stir for 10-20 minutes to obtain a stable composite potassium ferrate solution with a concentration of 0.17mol / L.

Embodiment 3

[0024] Take 150ml of 1.4mol / L sodium hypochlorite and 50.0g of sodium hydroxide in a reactor, control the temperature below 30°C with a water bath, and suction filter after white matter is formed, the obtained liquid is saturated alkaline sodium hypochlorite. Slowly add 30.0 g of finely ground ferric nitrate into the above liquid and stir, and control the reaction temperature at 25-35°C. After reacting for 1.5 hours, filter with suction to obtain sodium ferrate liquid. Add 50ml of saturated potassium hydroxide to the sodium ferrate solution, and stir for 10-15 minutes to obtain a composite potassium ferrate solution. Finally, add 2.20g of calcium hypochlorite, control the temperature in a water bath at 10-20°C, and stir for 10-20 minutes to obtain a stable composite potassium ferrate solution with a concentration of 0.24mol / L.

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Abstract

The invention relates to a method for preparing a composite potassium ferrate solution, which belongs to the chemistry and chemical industry and water treatment agent preparation process technical field. The method comprises the following preparation processes that: firstly, a sodium hypochlorite solution reacts with sodium hydroxide, a white salt substance is generated first and is subject to pumping filtration, then ferric nitrate is added according to a molar mass ratio of sodium hypochlorite to ferric nitrate being equal to between 1.5 and 2.0 to 1, the reaction temperature is between 20 and 45 DEG C, and the pumping filtration is performed after 1.5 to 2.0 hours of reaction; and then a filtrate is added with a saturated potassium hydroxide solution to ensure that the filtrate is transformed into a potassium ferrate solution. Then 0.06 to 0.16mol / L of calcium hypochlorite is added, the reaction temperature is controlled to between 10 and 30 DEG C, the reaction time is between 10 and 30 minutes, and finally the composite potassium ferrate solution with good stability is produced. The composite potassium ferrate solution prepared by the method has good stability, long preservation time, difficult decrease of high iron content, and easiness for industrialized production. The product can be widely used for purification treatment of algae-laden water, city domestic sewage and so on.

Description

technical field [0001] The invention relates to a method for preparing a composite potassium ferrate solution, belonging to the technical field of chemical engineering and water treatment agent preparation technology. Background technique [0002] Potassium ferrate was first discovered by Georg Stahl in Germany in 1702. In 1841, Fremy began to do real research on ferrate. More than a hundred years later, Schreye and Thompson first used hypochlorite to oxidize ferric iron in the laboratory to obtain high-purity and high-yield potassium ferrate. Since the 1950s, there has been a climax in the research on ferrate, mainly focusing on various preparation methods and applications of ferrate. Because it is a new and efficient multifunctional water treatment agent integrating oxidation, flocculation, sterilization, disinfection and deodorization, it can be widely used in water treatment and purification. It has a remarkable treatment effect on inorganic wastewater containing ammo...

Claims

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Application Information

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IPC IPC(8): C01G49/00C02F1/72C02F1/52C02F1/50
Inventor 邱慧琴张洁喻艳菁杨芳芳丁国际
Owner SHANGHAI UNIV
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