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Method for preparing high-performance rare earth magnetic refrigeration material by utilizing traditional Taylor reactor

A magnetic refrigeration material and reactor technology, applied in chemical instruments and methods, rare earth metal compounds, manganate/permanganate, etc., can solve the problems of complex process, high energy consumption, high temperature, etc. Simple, good sample uniformity, size controllable effect

Inactive Publication Date: 2020-03-27
杨杭福
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the rare earth magnetic refrigeration materials prepared by traditional high-temperature solid-state sintering have complicated process flow, long sintering time and high temperature, resulting in very high energy consumption and low uniformity of the prepared magnetic refrigeration materials.
[0004] In order to improve the uniformity of rare earth magnetic refrigeration materials and reduce energy consumption, the researchers used the sol-gel method and co-precipitation method to prepare nano-scale and micron-scale magnetic refrigeration materials, which improved the uniformity of the material and the refrigeration performance of the material. The degree has been improved, but the pollution caused by the sol-gel method is relatively large, and neither of these two methods can be widely used in actual industrial production

Method used

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  • Method for preparing high-performance rare earth magnetic refrigeration material by utilizing traditional Taylor reactor
  • Method for preparing high-performance rare earth magnetic refrigeration material by utilizing traditional Taylor reactor

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] (1) Ln is prepared by co-precipitation method in traditional Taylor reactor x A 1-x Mn (OH) 2 Precursor, Ln is lanthanum, A is calcium, where x=0.3, La is prepared by adjusting the molar concentration of sulfate 0.3 Ca 0.7 Mn (OH) 2 The precursor, the traditional Taylor reactor is such as figure 1 Shown.

[0024] Will La 2 (SO 4 ) 3 , CaSO 4 , MnSO 4 According to the molar ratio of 0.3:0.7:1, it is configured into a 2.5M 5L metal salt solution, with 3%~10% NH 4 A mixed solution of OH and 10%-15% NaoH is filled with deionized water in a 1L Taylor reactor.

[0025] Heat the Taylor reactor to 50~70 o C. Use a metering pump to inject the mixed solution of NH4OH and NaOH prepared in the reactor at 6-10 mL / min into the reactor, and use a metering pump to inject the prepared metal salt solution into the reactor at 3-8 mL / min, The pH of the solution in the reactor is controlled to be 11-12, and the stirring speed of the inner cylinder is 800-1500 rpm / min. During continuous stirring a...

Embodiment 2

[0028] (1) Ln is prepared by co-precipitation method in traditional Taylor reactor x A 1-x Mn (OH) 2 Precursor, Ln is praseodymium, A is strontium, where x=0.5, Pr is prepared by adjusting the molar concentration of sulfate 0.5 Sr 0.5 Mn (OH) 2 Precursor.

[0029] Pr 2 (SO 4 ) 3 , SrSO 4 , MnSO 4 According to the molar ratio of 0.5:0.5:1, it is configured into a 2.5M 5L metal salt solution, with 3%~10% NH 4 A mixed solution of OH and 10%-15% NaoH is filled with deionized water in a 1L Taylor reactor.

[0030] Heat the Taylor reactor to 50~70 o C. Use a metering pump to inject the mixed solution of NH4OH and NaOH prepared in the reactor at 6-10 mL / min into the reactor, and use a metering pump to inject the prepared metal salt solution into the reactor at 3-8 mL / min, The pH of the solution in the reactor is controlled to be 11-12, and the stirring speed of the inner cylinder is 800-1500 rpm / min. During the continuous stirring and solution injection process, the mixed solution overflow...

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Abstract

The invention discloses a method for preparing a high-performance rare earth magnetic refrigeration material by using a traditional Taylor reactor. The chemical composition formula of the rare earth magnetic refrigeration material is LnxA1-xMnO3, the element Ln in the compound is selected from rare earth elements such as La, Pr and Sm, the element A is selected from divalent metal elements of Ca and Sr, and x is larger than or equal to 0.3 and smaller than or equal to 0.7. The preparation method comprises the following steps: preparing an LnxA1-xMn(OH)2 precursor through a coprecipitation technology of a traditional Taylor reactor, and sintering the precursor in an oxygen atmosphere to obtain the rare earth magnetic refrigeration material. The precursor with good crystallinity and the sizeof 5-10 [mu]m can be obtained, the magnetic entropy of the rare earth magnetic refrigeration material obtained after sintering the precursor is increased, and the preparation can effectively reduce the high-temperature sintering temperature and time to save energy.

Description

Technical field [0001] The invention relates to a method for preparing high-performance rare earth magnetic refrigeration materials by using a traditional Taylor reactor, in particular to a method for preparing high-performance magnetic refrigeration materials with low energy consumption. . Background technique [0002] In recent years, room temperature magnetic refrigeration materials have been developed rapidly. Among them, rare earth manganese oxide magnetic refrigeration materials have large magnetic entropy changes under low fields, strong chemical stability, adjustable Curie temperature, high resistivity, and cost. The advantages of low, light specific gravity, non-toxic, easy to miniaturize, etc., have received extensive attention. [0003] However, the rare earth magnetic refrigeration material prepared by traditional high-temperature solid-phase sintering has a complicated process flow, long sintering time and high temperature, resulting in very high energy consumption an...

Claims

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Application Information

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IPC IPC(8): C01F17/32C01G45/12
CPCC01G45/1264C01P2006/42
Inventor 杨杭福黄霞妮吴琼泮敏翔葛洪良
Owner 杨杭福