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A kind of preparation method of iron-ferrous sulfide complex

A ferrous sulfide and composite technology, which is applied in the field of preparation of iron-ferrous sulfide composites, can solve the problems of high cost of raw materials, dangerous synthesis process, hydrogen generation and the like, and achieves simple preparation method, low cost of raw materials, and catalytic activity. high effect

Active Publication Date: 2020-05-29
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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  • A kind of preparation method of iron-ferrous sulfide complex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The planetary ball mill is used to prepare the iron-ferrous sulfide composite, and the steps are as follows: (1) Put 20% of the cavity volume of zirconia ball milling beads (with a diameter of 0.6mm) into the ball mill tank as a grinding medium; (2) call 0.256 g elemental sulfur powder and 2.244g zero-valent iron powder (particle size 38 microns to 74 microns) (the mass ratio of ferrosulfur is 1:8.76) are placed in a ball mill tank, and the tank is filled with nitrogen; (3) Turn on the ball mill, The grinding speed was adjusted to 500 rpm and the grinding was performed for 5 hours; (4) In a nitrogen atmosphere, the iron-ferrous sulfide composite was separated from the grinding medium with a screen to obtain the finished iron-ferrous sulfide composite.

[0033] Take trichloroethylene as an example to investigate the activity of the above materials. Add 4.25g of iron-ferrous sulfide complex to the 425mL reagent bottle, fill it up with deionized water, cover it tightly with a...

Embodiment 2

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

[0036] Take trichloroethylene as an example to investigate the activity of the above materials. Add 4.25g of iron-ferrous sulfide complex to the 425mL reagent bottle, fill it up with deionized water, cover it tightly w...

Embodiment 3

[0038] A planetary ball mill is used to prepare iron-ferrous sulfide composites. The steps are as follows: (1) Put 20% of the cavity volume of steel ball milling beads (with a diameter of 0.8mm) into the ball mill tank as the grinding medium; (2) Weigh 0.069g elemental sulfur powder and 2.43g zero-valent iron powder (particle size 38 micron ~ 74 micron) (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 Using a ball mill, adjust the grinding speed to 500 rpm, and grind for 5 hours; (4) In a nitrogen atmosphere, the prepared particles are separated from the grinding medium with a screen to obtain the iron-ferrous sulfide composite product.

[0039] Take trichloroethylene as an example to investigate the activity of the above materials. Add 4.25g of iron-ferrous sulfide complex to the 425mL reagent bottle, top up with deionized water, cover tightly with a lid with Teflon septum, and t...

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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 composite, and more specifically, a method for preparing an iron-ferrous sulfide composite with high efficiency and environmental protection. [0003] (2) Background technology [0004] Zero-valent iron, as a new groundwater in-situ repair technology, has received extensive attention at home and abroad. However, there are still many problems in the actual application of zero-valent iron. For example, strong magnetism and high surface energy will make it aggregate into large particles, which will make some active sites unable to be effectively released, and the utilization of active ingredients is very low; at the same time, zero A dense oxide film on the surface of iron-valent iron will greatly hinder the contact of active ingredients with target pollutants, thereby reducing the activity of zero-valent iron; in addition, hydrophilic zero-valent iron has poor affinity with hydro...

Claims

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Application Information

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Patent Type & Authority Patents(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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