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Preparation method of manganese-arsenic compound

An arsenic compound and manganese powder technology, applied in the fields of manganese compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of restricting the application of manganese arsenic compounds, difficult to control the preparation process, and volatile arsenic element, so as to ensure the arsenic content, High stability and low cost effect

Inactive Publication Date: 2020-08-07
XIANDAO THIN FILM MATERIALS GUANGDONG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current preparation process of manganese-arsenic compound powder is relatively cumbersome, and because arsenic element is volatile and easy to react with oxygen, the preparation process is not easy to control, and it is easy to cause arsenic deficiency, which restricts the application of manganese-arsenic compound in magnetic refrigeration materials. Applications

Method used

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  • Preparation method of manganese-arsenic compound
  • Preparation method of manganese-arsenic compound
  • Preparation method of manganese-arsenic compound

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A preparation method of manganese arsenic compound, comprising the following steps:

[0037] (1) Under the protection of helium, 150g of manganese powder with a manganese content≥99.9% and a particle size of 100 mesh and 150g of arsenic powder with an arsenic content≥99.999% and a particle size of 150 mesh are mixed in a mixer for 0.5h to obtain Mixture;

[0038] (2) Put the mixture obtained in step (1) into a tube furnace, continuously feed helium, and heat it to 200°C at a heating rate of 5°C / min, keep it warm for 1h, and then heat it at a heating rate of 7°C / min Heating to 450°C, keeping it warm for 5 hours, cooling with the furnace, scraping off the unalloyed part on the surface of the reactant to obtain the manganese-arsenic compound;

[0039] (3) Crushing the manganese-arsenic compound obtained in step (2) into powder, and passing through a 100-mesh sieve to obtain the manganese-arsenic compound powder.

[0040] The X-ray diffraction pattern of the surface layer...

Embodiment 2

[0045] A preparation method of manganese arsenic compound, comprising the following steps:

[0046] (1) Under the protection of nitrogen, mix 150 g of manganese powder with a manganese content ≥ 99.9%, a particle size of 200 mesh, and 120 g of arsenic powder with an arsenic content ≥ 99.999%, and a particle size of 170 mesh in a mixer for 0.8 hours to obtain a mixed material;

[0047](2) Put the mixture obtained in step (1) into a tube furnace, continuously feed nitrogen, and heat to 300°C at a heating rate of 8°C / min, keep it warm for 2 hours, and then heat at a heating rate of 10°C / min To 600 ℃, keep warm for 4 hours, cool with the furnace, scrape off the unalloyed part on the surface of the reactant, and obtain the manganese-arsenic compound;

[0048] (3) Crushing the manganese-arsenic compound obtained in step (2) into powder, passing through a 200-mesh sieve to obtain the manganese-arsenic compound powder.

[0049] The X-ray diffraction pattern of the surface layer of t...

Embodiment 3

[0054] A preparation method of manganese arsenic compound, comprising the following steps:

[0055] (1) Under the protection of argon, mix 150 g of manganese powder with a manganese content ≥ 99.9% and a particle size of 325 mesh and 100 g of arsenic powder with an arsenic content ≥ 99.999% and a particle size of 325 mesh in a mixer for 1 hour to obtain a mixture material;

[0056] (2) Put the mixture obtained in step (1) into a tube furnace, continuously feed argon, and heat it to 400°C at a heating rate of 10°C / min, keep it warm for 3h, and then heat it at a heating rate of 15°C / min Heating to 800°C, keeping it warm for 3 hours, cooling with the furnace, scraping off the unalloyed part on the surface of the reactant to obtain the manganese-arsenic compound;

[0057] (3) Crushing the manganese-arsenic compound obtained in step (2) into powder, and passing through a 325-mesh sieve to obtain the manganese-arsenic compound powder.

[0058] The X-ray diffraction pattern of the ...

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Abstract

The invention relates to a preparation method of a manganese-arsenic compound, which comprises the following steps: (1) uniformly mixing manganese powder and arsenic powder to obtain a mixture; and (2) putting the mixture obtained in the step (1) into a reactor, perofrming heating to 200-400 DEG C, carrying out heat preservation for 1-3 hours, then heating to 450-800 DEG C, carrying out heat preservation for 3-5 hours, and carrying out furnace cooling to obtain the manganese-arsenic compound. According to the method, a two-stage heating method is adopted in the reaction process, the uniformlymixed mixture is put into a tubular furnace under the protection of nitrogen or inert gas, and the reaction temperature and the reaction time are controlled, so that the manganese-arsenic compound powder with high arsenic content and high stability can be obtained. The method is low in cost, simple to operate and easy to control in reaction process, not only can prevent the formation of arsenic oxide, but also can ensure the arsenic content, and greatly reduces the volatilization of arsenic.

Description

technical field [0001] The invention relates to a preparation method of a manganese-arsenic compound, belonging to the technical field of magnetic refrigeration materials. Background technique [0002] Refrigeration technology is widely used in modern society, involving various fields of daily life. However, the commonly used traditional gas refrigeration technology has many disadvantages such as low efficiency and high noise, and the leakage of refrigerant Freon into the atmosphere will destroy the ozone layer and expose human beings to stronger ultraviolet rays. Therefore, it is imperative to seek new green and energy-saving refrigeration technologies. Compared with the traditional gas compression / expansion refrigeration technology, the magnetic refrigeration technology based on the magnetocaloric effect has the advantages of high efficiency, energy saving, green environmental protection, stability and reliability, etc. The core principle of this technology is to use the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/00
CPCC01G45/00C01P2004/60C01P2004/61
Inventor 吴彩红文崇斌王鹏飞朱刘胡智向
Owner XIANDAO THIN FILM MATERIALS GUANGDONG CO LTD
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