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Method for treating wastewater by using steelmaking converter dust sludge as heterogeneous Fenton catalyst

A technology for heterogeneous Fenton and steel-making converters, applied in chemical instruments and methods, special compound water treatment, oxidized water/sewage treatment, etc. Wide range of process parameters, simple method and good catalytic performance

Pending Publication Date: 2020-11-10
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main synthesis method of the catalyst is hydrothermal reaction and high-temperature firing. The metal ratio and process conditions are strictly controlled. Washing wastewater and sintering flue gas will also be generated, and the cost is relatively high.

Method used

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  • Method for treating wastewater by using steelmaking converter dust sludge as heterogeneous Fenton catalyst
  • Method for treating wastewater by using steelmaking converter dust sludge as heterogeneous Fenton catalyst
  • Method for treating wastewater by using steelmaking converter dust sludge as heterogeneous Fenton catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Obtain dust from converter steelmaking flue gas purification from a certain iron and steel plant, wash it with 1:10 water at 50°C, wash twice for 0.5h. Under stirring conditions, add 0.5g / L of pre-washed converter dust into 50mg / L methylene blue solution, add 0.35ml / L hydrogen peroxide, adjust the pH value to 4.5, and react under visible light for 3h. After the reaction, adjust the pH to 8.5, settle for 0.5h, and the supernatant is recovered by magnetic separation and then effluents. The decolorization rate of methylene blue reaches 99.1%. The result is as Figure 6 , Methylene blue has a characteristic absorption peak at 664nm, and the characteristic absorption peak disappears after 3 hours of reaction.

Embodiment 2

[0030] Under the condition of stirring, add the pretreated dust sludge obtained in Example 1 into the methylene blue solution of 100mg / L at 3.5 g / L, add hydrogen peroxide 1.2ml / L, adjust the pH value to 4, and Reaction 1.8h. After the reaction, adjust the pH to 7.5, settling for 2 hours, and the supernatant was recovered by magnetic separation, and the water was discharged. The decolorization rate of methylene blue reached 98.75%. Ultraviolet light irradiation is beneficial to increase the generation rate of hydroxyl radicals, improve the catalytic efficiency and shorten the reaction time.

Embodiment 3

[0032] Obtain converter steelmaking flue gas purification dust collection mud from a steel plant, wash it with 1:20 water at 90°C, and wash once for 2 hours. Under stirring conditions, add 3.8 g / L of washed dust into 65 mg / L of methyl orange solution, add 0.8 ml / L of hydrogen peroxide, adjust the pH value to 2.8, and react under visible light for 3 hours. Adjust the pH=7.8 at the end of the reaction, settling for 3 hours, the supernatant was recovered by magnetic separation, and the water was discharged, and the dust was collected by settling and magnetic separation. Under this condition, the first reaction is an activation process. After activation, the collected dust and sludge are treated twice under the same conditions. The decolorization effect is as follows: Figure 7 , the decolorization rate has reached 98.87% and 98.21% at 2.5h for the second and third times, indicating that after activation, the catalytic decolorization efficiency of converter dust and sludge has bee...

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Abstract

The invention discloses a method for treating wastewater by using steelmaking converter dust sludge as a heterogeneous Fenton catalyst, which comprises the following steps: (1) pretreating the converter dust mud for washing off salt and alkali metal oxide; (2) carrying out heterogeneous Fenton sewage treatment by using the pretreated dust sludge as a catalyst; and (3) carrying out sedimentation and magnetic separation on the dust sludge catalyst in the treated slurry to recover and reuse the dust sludge. The industrial by-product converter dust sludge is used as a heterogeneous Fenton catalystto treat sewage, so that solid-liquid separation and catalyst recovery are facilitated, wherein the recycled converter dust mud can be recycled, and the same catalytic effect can be kept; in addition, the leaching rate of metal ions is low, and secondary pollution to effluent is avoided.

Description

technical field [0001] The invention belongs to the technical field of solid waste utilization and water treatment, and relates to a method for treating waste water by using steelmaking converter dust as a heterogeneous Fenton catalyst. Background technique [0002] The Fenton method is a kind of advanced oxidation technology, which uses Fe 2+ Or Fe acts as a catalyst to decompose hydrogen peroxide to generate OH, thereby oxidizing organic matter and achieving the purpose of organic matter degradation or mineralization. The homogeneous Fenton reaction has strict requirements on pH conditions. Improper pH control can easily cause iron circulation to be blocked, and a large amount of iron sludge will be produced after neutralization in the effluent, which requires subsequent treatment. The iron ions formed by the catalyst cannot be reused after being consumed. Compared with the homogeneous Fenton reaction, the heterogeneous Fenton reaction has a wider range of reaction pH con...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F101/34C02F101/36C02F101/38
CPCC02F1/722C02F1/725C02F2101/36C02F2101/38C02F2101/40C02F2101/34C02F2305/026
Inventor 熊果刘欣何峰陈彤周云花邱军付熊嘉郑自豪
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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