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A kind of composite iron powder and its preparation method and application

A technology of iron powder and iron single substance, which is applied in the field of composite iron powder and its preparation, can solve the problems of inconvenient transportation and storage of finished products, poor flexibility of dosing methods, and difficulty in solidification and separation, so as to improve electron transfer efficiency and fast water purification effect , Strengthen the effect of adsorption and enrichment process

Active Publication Date: 2020-01-14
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of dangerous raw materials used in the preparation of existing iron-based reducing reagents, cumbersome preparation process, inconvenient transportation and storage of finished products, poor flexibility of dosing methods, and difficult solidification and separation, the invention provides a composite iron powder and its preparation method and application

Method used

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  • A kind of composite iron powder and its preparation method and application
  • A kind of composite iron powder and its preparation method and application
  • A kind of composite iron powder and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Preparation of composite iron powder:

[0048] Preparation of composite iron powder: Add 30g of zirconia balls with a particle size of 2mm into a 50mL ball mill tank, then add 0.75g of iron elemental raw materials with a particle size range of 50-200μm, and 0.35g of zirconia with a particle size range of 0.5-5μm Iron powder, 0.5g of ferrous chloride powder with a particle size range of 0.5-50μm, and then the ball mill jar is sealed and filled with nitrogen, and a planetary ball mill is used for high-energy ball milling at a speed of 600r / min, and the ball milling time is 30min. The ball milling is completed Finally, a 400-mesh screen is used to separate the grinding balls from the material to obtain composite iron powder. The ferrous chloride may contain crystal water, and after conversion, it is fed as anhydrous ferrous chloride. The mass ratio of zero-valent iron, ferric oxide and ferrous chloride in the finished product is 75:35:50, and the microscopic structure of ...

Embodiment 2

[0051] Preparation of composite iron powder

[0052] Preparation of composite iron powder: Add 35g of stainless steel balls with a particle size of 2mm into a 50mL ball mill tank, then add 0.60g of iron elemental raw material with a particle size range of 50-200μm, and 0.30g of trioxide with a particle size range of 0.5-5μm Iron powder, 0.25 g of ferrous chloride powder with a particle size range of 0.5-50 μm, and then the ball mill jar is sealed and filled with an inert gas, and the inert gas can be one of nitrogen, argon, and helium. A planetary ball mill was used for high-energy ball milling with a rotational speed of 400r / min and a ball milling time of 3 hours. After the ball milling was completed, a 400-mesh screen was used to separate the balls from the material to obtain composite iron powder. The mass ratio of zero-valent iron, ferric oxide and ferrous chloride in the finished product is 60:30:25. The composite iron powder is irregular polyhedron particles with fine p...

Embodiment 3

[0055] Preparation of composite iron powder

[0056] Preparation of composite iron powder: Add 8g of agate balls with a particle size of 5mm into a 50mL ball mill tank, then add 0.50g of iron elemental raw materials with a particle size range of 50-200μm, and 0.25g of trioxide tetroxide with a particle size range of 0.5-5μm Iron powder, 0.05g ferrous chloride powder with a particle size range of 0.5-50μm, and then cover the ball mill tank and fill it with nitrogen gas, use a planetary ball mill for high-energy ball milling, the speed is 200r / min, the ball milling time is 5h, and after the ball milling is completed, use 400 The mesh screen separates the grinding balls from the material to obtain composite iron powder. The mass ratio of zero-valent iron, ferric oxide and ferrous chloride in the finished product is 50:25:5. The composite iron powder is irregular polyhedron particles with fine particles embedded on the surface of the iron element. More than 80% of the weight. T...

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Abstract

The invention discloses composite iron powder and a preparation method and application thereof, and belongs to the field of water treatment. The composite iron powder is characterized in that an ironelement is treated as a main body, wherein ferroferric oxide particles and ferrous chloride particles are embedded into the surface of the iron element; the composite iron powder is in a form of irregular polygonal particles; the mass ratio of the iron element to ferroferric oxide to ferrous chloride in the composite iron powder is (50-75): (25-35): (5-50); the particle size of the composite ironpowder ranges from 3-30 microns, and the weight of the composite iron powder particles with the particle size ranging from 3-10 microns is beyond 80% of the total weight of the composite iron powder.According to the composite iron powder, the iron element, ferroferric oxide and ferrous chloride are used as the raw materials and are synthesized in one step by a ball milling method to prepare the composite iron powder. According to the composite iron powder, the used raw materials are safe and low in price; the preparation is simple; the adding is convenient; the water cleaning is quickly performed, and the water cleaning effect is obvious.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a composite iron powder and its preparation method and application. Background technique [0002] In the past two decades, zero-valent iron, as a cheap, highly reductive and environmentally friendly material, has been widely used to remove various pollutants such as heavy metals, reductive dechlorination of chlorinated organics, nitrobenzene and even nitrates. . At present, zero-valent iron technology has become one of the important technologies for sewage remediation and has a good application prospect. [0003] However, the large-scale application of zero-valent iron technology still faces many challenges. The passivation phenomenon of zero-valent iron is the biggest bottleneck in the application of zero-valent iron technology. Due to the effect of phase formation, a dense passivation layer will be formed on the surface of zero-valent iron after it is put into wate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/04
CPCB22F1/0003B22F9/04B22F2009/043
Inventor 潘丙才单超杨喆
Owner NANJING UNIV