Process for preparing solid potassium ferrate

A potassium ferrate and solid technology, applied in chemical instruments and methods, iron compounds, sodium/potassium compounds, etc., can solve problems such as large alkali consumption, high cost, and environmental pollution, and achieve reduced alkali consumption and raw material reduction The effect of cost and simple operation

Inactive Publication Date: 2006-03-22
SHENZHEN POLYTECHNIC
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for preparing solid potassium ferrate, which can effectively solve the problems of large alkali consumption, high cost and environmental pollution in the traditional potassium ferrate preparation process, and realize the clean synthesis of potassium ferrate Production Process

Method used

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preparation example Construction

[0016] The invention provides a kind of solid potassium ferrate preparation method, mainly comprises the following steps:

[0017] The step of preparing chlorine gas is to prepare chlorine gas by reacting potassium permanganate and concentrated hydrochloric acid at room temperature;

[0018] In the step of preparing a hypochlorite solution, the pre-prepared chlorine gas is introduced into the purified waste lye to react to prepare a hypochlorite solution;

[0019] The purification process of hypochlorite is to dissolve a certain amount of potassium hydroxide solid in the prepared hypochlorite solution under the condition of controlled temperature in an ice bath. After the potassium hydroxide is dissolved, pass the hypochlorite solution through the sand Core funnel filter to remove chloride impurities;

[0020] In the step of preparing potassium ferrate solution, a small amount of ferric nitrate is added to the hypochlorite solution prepared above within a certain period of ti...

example

[0030] The concrete technological process of the present invention is described in detail below with an example:

[0031] 1. Chlorine is produced by reacting potassium permanganate and concentrated hydrochloric acid at room temperature, wherein the ratio of the amount of potassium permanganate to concentrated hydrochloric acid is 1:8 to 1:12.

[0032] 2. Pass the obtained chlorine gas into 50ml of purified spent lye, and prepare a hypochlorite solution under ice bath conditions.

[0033] 3. Purify the hypochlorite solution before use, dissolve 40-50g of potassium hydroxide solid in the hypochlorite solution, and control the temperature with an ice bath at 0°C; after the potassium hydroxide is dissolved, the hypochlorite The solution was filtered through a sand core funnel to remove chloride impurities.

[0034] 4. Weigh a small amount of 15-20g ferric nitrate and add it to the hypochlorite solution prepared above within a certain period of time. During the reaction, use an ic...

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Abstract

The preparation process of solid potassium ferrate includes the following steps: introducing chlorine into purified waste alkali solution to prepare hypochlorite solution; adding ferric nitrate into the solution to prepare potassium ferrate solution; adding solid potassium hydroxide, dissolving and filtering to obtain coarse potassium ferrate product; washing coarse potassium ferrate product with potassium hydroxide solution; filtering to obtain re-crystallized potassium ferrate product; washing with organic solvent and vacuum drying to obtain stable solid potassium ferrate product; collecting all the filtrate and treating for reuse. The present invention has the circulated utilization of waste alkali solution, low cost and less environmental pollution.

Description

【Technical field】 [0001] The invention relates to a method for preparing potassium ferrate, in particular to a method for preparing solid potassium ferrate for recycling spent caustic soda. 【Background technique】 [0002] Potassium ferrate exists in the form of hexavalent ions of iron, and its Fe element can transfer 3 electrons in the electrode reaction, which can be used as an electrode material to produce high-energy batteries. Due to the special chemical properties of potassium ferrate, its application potential in water treatment is huge. Tests have shown that potassium ferrate is a highly efficient multifunctional water purifier integrating disinfection, oxidation, flocculation, adsorption and coagulation assistance. And in the process of treating water with potassium ferrate, no toxic and harmful substances will be introduced or caused. However, at present, due to the limitation of product synthesis, relevant research is limited to disinfection, ecotoxicology and ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D13/00C01G49/00
Inventor 姜成春刘臣邓爱华樊雪红
Owner SHENZHEN POLYTECHNIC
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