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Method for preparing potassium ferrate by using waste liquid from acid washing steel

A technology for iron and steel pickling waste liquid, potassium ferrate, applied in chemical instruments and methods, iron compounds, sodium/potassium compounds, etc., can solve problems such as environmental pollution and resource waste, achieve a wide range of use, eliminate pollution, and The effect of the application foreground

Inactive Publication Date: 2007-05-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the operation process of its purification and separation, a large amount of potassium hydroxide should be added, and a large amount of waste lye will be produced after filtration, which is not only a great waste of resources, but also causes serious pollution to the environment.

Method used

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  • Method for preparing potassium ferrate by using waste liquid from acid washing steel

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Experimental program
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Effect test

Embodiment 1

[0022] A method for preparing potassium ferrate by utilizing iron and steel pickling waste liquor, it comprises the steps:

[0023] 1) Iron and steel pickling waste liquid (containing Fe 2+ The mass percentage is 0.1%, Fe 3+ The mass percentage is 0.1%, Cl - The mass percentage is 0.1%, and the acidity is 0mol / l) and the hydrochloric acid that the mass fraction is 21% is mixed with the volume ratio of 1000:6, and the mixed solution is aerated with an aerator, and heated to 40°C; when the temperature reaches 40°C , add NaNO with a weight concentration of 1‰ 2 , NaNO with a weight concentration of 1‰ 2 The dosage is 0.1% of the mass of the mixed liquid, continue to aerate, and maintain the system at 40°C for 1 hour; the reaction equation involved:

[0024] ,

[0025] ,

[0026] After the reaction was completed, the reaction solution was added to the alkali solution, and the Fe 3+ with Fe(OH) 3 Precipitated in the form of, among them, OH - The total amount of...

Embodiment 2

[0033] A method for preparing potassium ferrate by utilizing iron and steel pickling waste liquor, it comprises the steps:

[0034] 1) Iron and steel pickling waste liquid (containing Fe 2+ The mass percentage is 10%, Fe 3+ The mass percentage is 10%, Cl - The mass percentage is 20%, and the acidity is 3mol / l) and the hydrochloric acid that the mass fraction is 10% is mixed with the volume ratio of 1000:30, and the mixed solution is aerated with an aerator, and heated to 70°C; when the temperature reaches 70°C , add NaNO with a weight concentration of 30‰ 2 , NaNO with a weight concentration of 30‰ 2 The dosage is 2% of the mass of the mixture, continue to aerate, and maintain the system at 70°C for 4 hours; the reaction equation involved:

[0035] ,

[0036] ,

[0037] After the reaction was completed, the reaction solution was added to the alkali solution, and the Fe 3+ with Fe(OH) 3 Precipitated in the form of, among them, OH - The total amount of matte...

Embodiment 3

[0044] A method for preparing potassium ferrate by utilizing iron and steel pickling waste liquor, it comprises the steps:

[0045] 1) Iron and steel pickling waste liquid (containing Fe 2+ The mass percentage is 20%, Fe 3+ The mass percentage is 20%, Cl - The mass percentage is 35%, acidity 6mol / l) is mixed with the hydrochloric acid that mass fraction is 21% with the volume ratio of 1000:40, the mixed solution is aerated with an aerator, and heated to 90 ℃; when the temperature reaches 90 ℃ , add NaNO with a weight concentration of 50‰ 2 , NaNO with a weight concentration of 50‰ 2 The dosage is 5% of the mass of the mixed liquid, continue to aerate, and maintain the system at 90°C for 6 hours; the reaction equation involved:

[0046] ,

[0047] ,

[0048] After the reaction was completed, the reaction solution was added to the alkali solution, and the Fe 3+ with Fe(OH) 3 Precipitated in the form of, among them, OH - The total amount of matter is Fe 3+ 5...

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Abstract

This invention relates to a method preparing potassium ferrate from steel acid-washing waste liquid. The method comprises: oxidizing bivalent iron ions in steel acid-washing waste liquid into trivalent iron ions, precipitating trivalent iron ions to obtain Fe (OH) 3, and oxidizing Fe (OH) 3 by KClO in a strong alkaline condition to obtain potassium ferrate. The process mainly comprises: catalytically oxidizing, filtering the precipitate, oxidizing by KClO, recovering the filtrate, recrystallizing for purification, and washing with organic solvent. The method is environmentally friendly.

Description

technical field [0001] The invention belongs to the field of resource utilization of iron and steel pickling waste liquid, and in particular relates to a method for preparing potassium ferrate by using iron and steel pickling waste liquid. Background technique [0002] During the processing of iron and steel products, hydrochloric acid or sulfuric acid is often used to pickle and derust the surface, resulting in a large amount of pickling waste. At present, the treatment methods for this kind of waste acid mainly include neutralization method, high-temperature roasting method, electrodialysis, ion exchange membrane, nanofiltration, etc. The problems existing in these methods are mainly secondary pollution, high treatment cost, and social and economic benefits. Low or unable to fully recover and utilize the acid and iron in it. [0003] Ferrate (Fe(VI)) is a stronger oxidizing agent than potassium permanganate and chlorine gas. Potassium ferrate product with high purity is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00C01D13/00C02F9/04
Inventor 夏世斌罗斌华石华前
Owner WUHAN UNIV OF TECH
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