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Catalytic oxidation method for converting ferrous iron into ferric iron at normal temperature and normal pressure

A technology for catalytic oxidation and ferric iron, applied in chemical instruments and methods, iron compounds, ferric halides, etc., can solve the problems of increasing costs, affecting the conversion efficiency of ferrous iron and ferric salt product quality, and difficult to guarantee product quality , to achieve the effect of low operating cost, stable product quality and simple operation

Inactive Publication Date: 2016-07-06
北京天下兴科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, because oxidizing agents such as hydrogen peroxide and sodium chlorate are usually easy to decompose at high temperatures, this affects the conversion efficiency of ferrous iron and the product quality of ferric salts, resulting in increased costs and difficult product quality assurance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Dissolve 90 kilograms of ferrous chloride in 210 kilograms of water, and configure 300 kilograms of ferrous chloride solution with a mass concentration of 30%.

[0017] 2) 45 kilograms of potassium permanganate, 4.5 kilograms of sodium nitrite, and 54 kilograms of sodium sulfate were added to 30% ferrous chloride solution, adjusted pH to 2.0 with 30% sodium hydroxide solution, and stirred for 4 hours.

[0018] After completing the above steps, 410 kilograms of ferric chloride solution were obtained, and the conversion rate of ferrous iron was greater than or equal to 99%.

Embodiment 2

[0020] 1) Dissolve 10 kilograms of ferrous nitrate in 90 kilograms of water, and configure 100 kilograms of ferrous nitrate solution with a mass concentration of 10%.

[0021] 2) Add 1 kg of sodium chlorate, 0.5 kg of ammonium nitrite and 2 kg of sodium carbonate to the 10% ferrous nitrate solution, adjust the pH to 2.5 with 10% sodium hydroxide solution, and stir for 1 hour.

[0022] After completing the above steps, 110 kg of ferric nitrate solution was obtained, and the conversion rate of ferrous iron was ≥99%.

Embodiment 3

[0024] 1) Dissolve 150 kilograms of ferrous sulfate in 450 kilograms of water, and configure 600 kilograms of ferrous nitrate solution with a mass concentration of 25%.

[0025] 2) 10 kilograms of potassium hypochlorite, 5 kilograms of hydrogen peroxide, 4.5 kilograms of potassium nitrite, 30 kilograms of sodium phosphate were added to the 25% ferrous nitrate solution, adjusted pH to 2.0 with 30% sodium hydroxide solution, and stirred for 3 hours.

[0026] After completing the above steps, 660 kg of ferric sulfate solution was obtained, and the conversion rate of ferrous iron was greater than or equal to 99%.

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Abstract

The invention discloses a catalytic oxidation method for converting ferrous iron into ferric iron at a normal temperature and a normal pressure. The method comprises the following steps: dissolving water-soluble ferrous salt in water to prepare a ferrous salt solution with a mass concentration of 10-30%; adding an oxidant, a catalyst and an additive to an aqueous solution of ferrous salt according to a mass ratio of the oxidant to the catalyst to the additive to the ferrous salt being (0.01-0.5): (0.01-0.1): (0.01-0.6): 1.0 to obtain a mixture; adjusting pH within a range of 2.0-3.0; and mixing and stirring the mixture in a reactor for 1.0-4.0 hours to obtain an aqueous solution of ferric iron.

Description

technical field [0001] The invention relates to a technology for oxidizing ferrous iron into ferric iron under normal temperature and pressure. Specifically, by adding an oxidant, a catalyst and an auxiliary agent to a water-soluble ferrous salt solution, and under normal temperature and pressure, after 1 The ferric salt can be converted into a ferric salt within ~4 hours of reaction. Background technique [0002] In industrial production, ferric salt is usually produced by oxidation reaction with ferrous salt as raw material. For example, ferrous chloride is oxidized to ferric chloride, ferrous nitrate is oxidized to ferric nitrate, and ferrous sulfate is oxidized to ferric sulfate. , ferrous thiocyanate is oxidized to ferric thiocyanate, etc. The oxidation reaction is the only way to convert dimethyl ferric salt into ferric salt. Commonly used oxidation techniques include: (1) catalytic oxidation, that is, in the catalyst (such as NaNO 2 , HNO 3 (2) Direct oxidation met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/10C01G49/00C01G49/14C01C3/20
CPCC01C3/20C01G49/00C01G49/10C01G49/14
Inventor 钟立春刘钟莘韬
Owner 北京天下兴科技有限公司