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Nano zero-valent iron prepared by using iron and steel acid-cleaning wastewater and preparation method and application thereof

A nano-zero-valent iron and steel pickling technology, which is applied in the direction of protection devices against harmful chemicals, can solve the problems of high operating conditions and equipment requirements, cumbersome operation, etc., and achieve high environmental and economic benefits and enterprise benefits. Time-consuming Short, low energy consumption effect

Active Publication Date: 2010-09-29
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese invention patent with the application number 200610016272.6 discloses "the method of recycling waste hydrochloric acid from pickling in the iron and steel industry and recovering nano-iron powder and carbon monoxide". Although this method can effectively recycle pickling wastewater, its operation is cumbersome and requires Conditions and high equipment requirements

Method used

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  • Nano zero-valent iron prepared by using iron and steel acid-cleaning wastewater and preparation method and application thereof
  • Nano zero-valent iron prepared by using iron and steel acid-cleaning wastewater and preparation method and application thereof
  • Nano zero-valent iron prepared by using iron and steel acid-cleaning wastewater and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] (1) Pretreatment of pickling wastewater in the iron and steel industry: the pickling wastewater in the iron and steel industry (taken from Guangzhou Jinlai Cold Rolled Strip Steel Co., Ltd.) without removing iron ions is suction-filtered to filter out solid residues, and then use a concentration of 1.0mol The sodium hydroxide solution of / L regulates the pH value of filtrate to be 4, and plasma inductively coupled emission spectrometry records the content of each element in the waste water, as shown in table 1:

[0042] Table 1

[0043]

[0044] (2) Preparation of sodium borohydride solution: absolute ethanol and water are mixed uniformly at a volume ratio of 3:7; L of sodium borohydride solution.

[0045](3) Preparation of nanometer zero-valent iron: at 25°C, get 4.8ml of pickling waste water filtered in step (1), join in 50ml of alcoholic aqueous solution (ethanol: water=3:7), then add 0.58g poly Vinylpyrrolidone, stir to mix. Then add the whole sodium borohydri...

Embodiment 2

[0051] (1) Pretreatment of pickling wastewater in the iron and steel industry: the pickling wastewater in the iron and steel industry (taken from Guangzhou Jinlai Cold Rolled Strip Co., Ltd.) without removing iron ions is suction filtered to filter out solid residues, and then use a concentration of 2.0mol / L of sodium hydroxide solution to adjust the pH value of the filtrate is 6.5, and adopt atomic absorption method to measure the content of total iron ion in the waste water simultaneously, record the content of total iron ion to be 122g / L.

[0052] (2) Preparation of sodium borohydride solution: absolute ethanol and water are mixed uniformly in a volume ratio of 3:7; L of sodium borohydride solution.

[0053] (3) Preparation of nanometer zero-valent iron: at 30°C, take 7.2ml of pickling waste water filtered in step (1), join in 50ml of alcoholic aqueous solution (ethanol: water=3:7), then add 0.87g poly Vinylpyrrolidone, stir to mix. Then add the whole sodium borohydride ...

Embodiment 3

[0057] (1) Pretreatment of pickling wastewater in the iron and steel industry: Suction filter the pickling wastewater in the iron and steel industry (taken from Guangzhou Jinlai Cold Rolled Strip Co., Ltd.) without removing iron ions, filter out the solid residue, and then use a concentration of 0.5mol / L of sodium hydroxide solution to adjust the pH value of the filtrate to be 5, and adopt atomic absorption method to measure the content of total iron ions in the waste water simultaneously, record the content of total iron ions to be 122g / L.

[0058] (2) Preparation of sodium borohydride solution: absolute ethanol and water are mixed uniformly at a volume ratio of 3:7; L of sodium borohydride solution.

[0059] (3) Preparation of nanometer zero-valent iron: at 20°C, take 3.6ml of the pickling waste water filtered in step (1), join in 50ml of alcoholic aqueous solution (ethanol: water=3:7), then add 0.44g Polyvinylpyrrolidone, stir to mix. Then add whole sodium borohydride so...

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Abstract

The invention discloses nano zero-valent iron prepared by using iron and steel acid-cleaning wastewater and a preparation method and application thereof. The preparation method comprises the following steps: filtering acid-cleaning wastewater without removing iron ions in the iron and steel industry; regulating pH value of filtrate; successively adding ethanol solution and polyvinylpyrrolidone; adding sodium borohydride, absolute ethanol and water to prepare into sodium borohydride solution; stirring under protection of inert gas for reaction; and carrying solid-liquid separation, collecting, washing and drying solid to obtain the nano zero-valent iron. In the invention, addition of polyvinylpyrrolidone is equivalent to the mass of total iron ions in a reaction system; and the mole number of sodium borohydride is as at least three times as that of the iron ions in the total reaction system. The method can effectively convert the iron ions in the acid-cleaning wastewater in the iron and steel industry into the nano zero-valent irons, and the conversion rate reaches up to over 99%; sizes of the nano zero-valent iron particles prepared by the method are between 50-80 nm; and the nano zero-valent iron particles are spherical particles, and have good crystal forms and strong capability of degrading polybrominated diphenyl ethers.

Description

technical field [0001] The invention belongs to the two technical fields of waste utilization and waste water treatment in environmental engineering, and in particular relates to a nanometer zero-valent iron prepared by using steel pickling waste water, a preparation method and application thereof. Background technique [0002] As we all know, the treatment of pickling wastewater in the iron and steel industry has always been a hot research direction of world environmental problems. In China, this type of wastewater has been designated as a hazardous pollutant and it is strictly forbidden to discharge it into natural water bodies without treatment. For a long time, the treatment method of this kind of wastewater has been mainly based on sedimentation treatment, and subsequent treatment processes are required, and the cost is relatively high. Because this type of wastewater contains a large amount of metals, especially iron ions, some new methods for treating and recovering ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24A62D3/37A62D101/28
Inventor 方战强邱心泓陈金红丘秀琪黄华坚
Owner SOUTH CHINA NORMAL UNIVERSITY
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