Method for preparing pyrite type iron disulfide by high-temperature high-pressure one-step chemical method

A technology of pyrite type and iron disulfide, which is applied to the method of using atmospheric pressure to chemically change substances, chemical instruments and methods, iron sulfide, etc., which can solve the problem of reduced quality of reaction products, insufficient sulfide degree, and extremely long maintenance Time and other issues, to achieve the effect of easy control of reaction conditions, broad reaction conditions, and accelerated reaction speed

Pending Publication Date: 2020-04-10
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The meteorological synthesis method needs to ensure good vacuum conditions, the process control needs to be quite high precision, and the synthesis speed is also slow. It is often only suitable for a small amount of single crystal or thin film synthesis, and it is difficult to meet the needs of a large number of synthesis.
The thermochemical synthesis method adopts the method of reacting iron or ferrous sulfide directly with sulfur under heating conditions. This method has a large amount of synthesis and easy access to raw materials, but still requires airtight conditions.
In addition, due to the difficulty in the diffusion of sulfur in iron sulfide, the reaction needs to be maintained for a very long time, and the products of thermal vulcanization often contain a large amount of other impurities with insufficient sulfide, which seriously reduces the quality of the reaction product
[0006] In summary, due to the many defects in the existing technology of artificially preparing a large amount of pyrite-type iron disulfide, it cannot meet the needs of many fields for pyrite-type iron disulfide

Method used

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  • Method for preparing pyrite type iron disulfide by high-temperature high-pressure one-step chemical method
  • Method for preparing pyrite type iron disulfide by high-temperature high-pressure one-step chemical method
  • Method for preparing pyrite type iron disulfide by high-temperature high-pressure one-step chemical method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The raw materials are iron sulfide ferrous sulfide and sulfur powder, and the two are mixed in a molar ratio of 1:4. Among them, the iron sulfide ferrous sulfide has not been purified, and the XRD spectrum is as follows figure 1 shown. The mixed sample powder is pressed into a block. The block obtained by pressing the powder is assembled into a composite assembly with pyrophyllite as the external pressure transmission medium, metal oxide ceramics as the internal pressure transmission medium, and graphite tube as the heating element. A six-sided top press was used to provide pressure and temperature to the synthetic assembly. Ensure that the reactants in the synthesis assembly are kept at a high temperature of 550°C for 2 hours under a high pressure of 1GPa. The X-ray diffraction pattern of the product after the reaction is as follows figure 2 As shown, it can be seen from the figure that the synthesized product is pure phase pyrite type iron disulfide.

Embodiment 2

[0028] The raw materials are the same as in Example 1, and the molar ratio of the raw materials is adjusted to 1:3 for mixing, and the mixed sample powder is pressed into a block. The block obtained by pressing the powder is assembled into a composite assembly with pyrophyllite as the external pressure transmission medium, metal oxide ceramics as the internal pressure transmission medium, and graphite tube as the heating element. A six-sided top press was used to provide pressure and temperature to the synthetic assembly. Ensure that the reactants in the synthesis assembly are kept at a high temperature of 600°C for 1.5 hours under a high pressure of 2GPa. The product after the reaction can be known as pyrite type iron disulfide through XRD analysis, such as image 3 shown.

Embodiment 3

[0030] The raw materials are the same as in Example 1, and the molar ratio of the raw materials is adjusted to 1:2 for mixing, and the mixed sample powder is pressed into a block. The block obtained by pressing the powder is assembled into a composite assembly with pyrophyllite as the external pressure transmission medium, metal oxide ceramics as the internal pressure transmission medium, and graphite tube as the heating element. A six-sided top press was used to provide pressure and temperature to the synthetic assembly. Ensure that the reactants in the synthesis assembly are kept at a high temperature of 650°C for 2.5 hours under a high pressure of 5GPa. The product after the reaction can be known as pyrite type iron disulfide through XRD analysis, such as Figure 4 shown.

[0031] It can be seen from the above examples that the present invention has the characteristics of easy acquisition of raw materials, no need for purification, low cost, short reaction time, high prod...

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Abstract

The invention discloses a method for preparing pyrite type iron disulfide by a high-temperature high-pressure one-step chemical method, and belongs to the technical field of functional material preparation. The method mainly comprises the steps: uniformly mixing ferrous sulfide and sulfur powder to obtain a mixture; pressing and molding the mixture to prepare a block; and placing the block formedby powder pressing molding under a high pressure higher than one atmospheric pressure, and carrying out a reaction at a high temperature of higher than 300 DEG C to obtain the pyrite type iron disulfide. The reaction raw materials are easy to obtain and low in price, ferrous sulfide is directly selected as the raw material, the reaction process is simplified, the reaction raw materials and products are solid, intermediate products cannot be discharged into the environment, the anti-interference capacity of a reaction system is high, and reaction conditions are wide and easy to control.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and in particular relates to a high-temperature and high-pressure preparation method of pyrite-type iron disulfide. Background technique [0002] With the development of science and technology, human beings plunder a large amount of non-renewable resources, resulting in energy and environment has become a major issue in human development. In this severe situation, human beings have begun to spontaneously pursue efficient and clean energy, and high-quality energy materials are an indispensable factor for realizing these pursuits. Therefore, the development and utilization of energy materials has become an increasingly hot topic. [0003] Pyrite-type iron disulfide is a functional material with unique properties, which has a wide range of applications in the fields of energy and cleaning. First of all, it has a very high light absorption coefficient, is an ideal solar ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/12B01J3/06B01F13/10
CPCC01G49/12B01J3/062B01F33/80B01F33/8362
Inventor 贾晓鹏王遥马红安
Owner JILIN UNIV
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