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Preparation method for iron-ferrous sulfide composite

A technology for ferrous sulfide and composites, which is applied in the field of preparation of iron-ferrous sulfide composites, which can solve the problems of expensive raw material costs, dangerous synthesis process, and hydrogen generation, and achieves simple preparation methods, low raw material costs, and high catalytic activity. high effect

Active Publication Date: 2017-03-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the composites of iron and ferrous sulfide prepared by chemical methods are small in size, there are many shortcomings in the preparation process: (1) the synthesis method is cumbersome; (2) iron is easily oxidized during the synthesis process; (3) the cost of raw materials is expensive, And will produce a large amount of waste water; (4) borohydride will produce hydrogen, there is a certain danger in the synthesis process

Method used

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  • Preparation method for iron-ferrous sulfide composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Adopt planetary ball mill to prepare iron-ferrous sulfide composite body, the steps are as follows: (1) zirconia ball milling beads (particle diameter 0.6mm) with 20% cavity volume are packed in ball mill jar as grinding medium; (2) Weigh 0.256 g elemental sulfur powder and 2.244g zero-valent iron powder (38 microns to 74 microns in particle size) (the sulfur-iron mass ratio is 1:8.76) are placed in the ball mill jar, and are filled with nitrogen in the jar; (3) open the ball mill, and Adjust the grinding speed to 500rpm, and grind for 5 hours; (4) under a nitrogen atmosphere, use a screen to separate the prepared iron-ferrous sulfide composite from the grinding medium to obtain the finished iron-ferrous sulfide composite.

[0033] Taking trichlorethylene as an example, the activity of the above materials was investigated. Add 4.25g of iron-ferrous sulfide complex to a 425mL reagent bottle, fill it up with deionized water, cover it tightly with a cap with a Teflon septu...

Embodiment 2

[0035] A planetary ball mill is used to prepare iron-ferrous sulfide composites, and the steps are as follows: (1) zirconia ball milling beads (0.6 mm in diameter) with 20% cavity volume are packed into a ball mill jar as a grinding medium; (2) 0.135g of elemental sulfur powder and 2.365g of zero-valent iron powder (particle size 38 microns to 74 microns) (the mass ratio of sulfur to iron is 1:17.5) are continuously stirred and mixed in the ball mill tank, and the tank is filled with nitrogen; (3) Turn on the ball mill, adjust the grinding speed to 500rpm, and grind for 5 hours; (4) under a nitrogen atmosphere, use a screen to separate the prepared particles from the grinding medium to obtain the finished iron-ferrous sulfide complex.

[0036] Taking trichlorethylene as an example, the activity of the above materials was investigated. Add 4.25g of iron-ferrous sulfide complex to a 425mL reagent bottle, fill it up with deionized water, cover it tightly with a cap with a Teflon ...

Embodiment 3

[0038]A planetary ball mill is used to prepare iron-ferrous sulfide composites, the steps are as follows: (1) steel ball milling beads (0.8 mm in diameter) with 20% of the cavity volume are packed into a ball mill jar as a grinding medium; (2) 0.069g of elemental sulfur powder and 2.43g of zero-valent iron powder (particle size 38 microns to 74 microns) (the mass ratio of sulfur to iron is 1:35.2) are continuously stirred and mixed in the ball mill tank, and the tank is filled with nitrogen; (3) open In a ball mill, adjust the grinding speed to 500rpm, and grind for 5 hours; (4) under a nitrogen atmosphere, use a screen to separate the prepared particles from the grinding medium to obtain the finished iron-ferrous sulfide complex.

[0039] Taking trichlorethylene as an example, the activity of the above materials was investigated. Add 4.25g of iron-ferrous sulfide complex to a 425mL reagent bottle, fill it up with deionized water, cover it tightly with a cap with a Teflon sept...

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Abstract

The invention discloses a preparation method for an iron-ferrous sulfide composite. The method comprises the steps that elemental sulfur powders and iron sulfide powders are mixed at a a mass ratio of 1: 5-60 or pyrite powders and micron-grade iron powders are mixed at a mass ratio of 1: 5-60; the obtained mixed raw materials are put into a ball mill tank of a ball mill; the ball mill tank is filled with grinding media, and the ball mill tank is in a vacuum environment or inert gas atmosphere; and the ball mill is started, the grinding speed is 400-4000 rpm, the grinding time is 2-30 hours, the grinding media and a product are separated after grinding, and the iron-ferrous sulfide composite is obtained. The grain size of the prepared iron-ferrous sulfide composite is below 10 micrometers. The preparation method is simple, the raw materials are low in cost, and poisonous and harmful dangerous chemicals are not used or generated. The prepared iron-ferrous sulfide composite can efficiently purify chlorine-contained organic pollutants and heavy metals in water, and is especially suitable for in-situ repairing of polluted underground water.

Description

[0001] (1) Technical field [0002] The invention relates to a method for preparing an iron-ferrous sulfide complex, in particular to a method for preparing an efficient and environment-friendly iron-ferrous sulfide complex. [0003] (2) Background technology [0004] As an emerging in-situ remediation technology for groundwater, zero-valent iron has attracted widespread attention at home and abroad. However, there are still many problems in the practical application of zero-valent iron, such as strong magnetism and high surface energy, which will cause it to aggregate into large particles, which will prevent some active sites from being released effectively, and the utilization rate of active components is very low; at the same time, zero-valent iron A dense oxide film on the surface of valent iron will greatly hinder the contact between active ingredients and target pollutants, thereby reducing the activity of zero-valent iron; in addition, the hydrophilic zero-valent iron ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04
CPCB22F9/04B22F2009/043
Inventor 何锋谷亚威万顺利
Owner ZHEJIANG UNIV OF TECH
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