Method for preparing spinel type ferrite under mild condition

A technology of spinel type and ferrite, which is applied in the field of preparation of spinel type ferrite, can solve the problems of difficult control of microemulsion process operation, harsh operating conditions, environmental pollution, etc., and achieve low equipment requirements, Easy to operate and no pollution to the environment

Inactive Publication Date: 2008-01-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the preparation process of spray pyrolysis is often accompanied by a large amount of toxic gas, which will cause serious pollution to the environment; the process operation of the microemulsion method is difficult to control; the supercrit...

Method used

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  • Method for preparing spinel type ferrite under mild condition
  • Method for preparing spinel type ferrite under mild condition
  • Method for preparing spinel type ferrite under mild condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A. Weigh 8.461 grams of Mg(NO 3 ) 2 ·6H 2O, 9.174 g FeSO 4 ·7H 2 O and 6.600 g Fe 2 (SO 4 ) 3 Place in a three-necked flask, add deoxygenated deionized water and stir until the solid mixture is fully dissolved. Preparation of NaOH and NaCO with deoxygenated deionized water 3 A mixed alkaline solution in which the concentration of NaOH is 2.0M, NaCO 3 The concentration is 1.5M. Under nitrogen protection and vigorous stirring, the mixed lye was slowly added dropwise to the salt solution until the pH of the reaction system was ≈11, and then the stirring was continued for 2 hours.

[0032] B. After the stirring is completed, the obtained product is left to stand for crystallization at room temperature for 4 hours, and then placed in a water bath at a constant temperature of 90° C. for crystallization for 18 hours.

[0033] C. Filter the above mixture, and wash with deionized water and absolute ethanol several times successively.

[0034] D. Put the filtered solid...

Embodiment 2

[0038] A, weigh 4.231 grams of Mg (NO 3 ) 2 ·6H 2 O, 4.595 g FeSO 4 ·7H 2 O and 3.300 g Fe 2 (SO 4 ) 3 Place in a three-necked flask, add deoxygenated deionized water and stir until the solid mixture is fully dissolved. Prepare NaOH and NaCO with deoxygenated deionized water 3 A mixed alkaline solution in which the concentration of NaOH is 1.5M, NaCO 3 The concentration is 1.0M. Under nitrogen protection and vigorous stirring, the lye was slowly added dropwise to the above-mentioned salt solution until the pH ≈ 10.5, and then continued to stir for 2 hours.

[0039] B. After the stirring is completed, the product is left to stand for crystallization at room temperature for 5 hours, and then placed in a water bath at a constant temperature of 80° C. for crystallization for 20 hours.

[0040] C. Filter the above mixture, and wash it several times with deionized water and absolute ethanol successively.

[0041] D. Put the filtered solid in a conical flask, add an approp...

Embodiment 3

[0045] A. Weigh 4.075 grams of Co(NO 3 ) 2 ·6H 2 O, 3.892 g FeSO 4 ·7H 2 O and 2.828 g Fe 2 (SO 4 ) 3 Place in a three-necked flask, add deoxygenated deionized water and stir until the solid mixture is fully dissolved. Prepare NaOH and NaCO with deoxygenated deionized water 3 A mixed alkaline solution in which the concentration of NaOH is 2.5M, NaCO 3 The concentration is 1.8M. Under nitrogen protection and vigorous stirring, the mixed lye was slowly added dropwise to the above-mentioned three-neck flask containing the salt solution until pH ≈ 11, and then continued to stir for 2 hours.

[0046] B. After the stirring is completed, the product is left to stand for crystallization at room temperature for 4 hours, and then placed in a water bath at a constant temperature of 95° C. for crystallization for 20 hours.

[0047] C. Filter the above mixture, and wash it several times with deionized water and absolute ethanol successively.

[0048] D. Put the filtered solid in...

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Abstract

This invention relates to method for preparing spinel-type ferrite at mild condition. Fist, LDH micro-crystal is synthesized by using single-dropping method, then proceeded is crystal-type transmission under 80-100deg.C, after that proceeded are: washing, negative filtration, drying to obtain single crystalline-phase spinel-type ferrite. This invention method has advantages of: no need of pre-product of hydrotalcite with better crystallization degree, no need of high temperature sintering, the reaction needs only ambient pressure and temperature lower than 100deg.C. The invention has advantages of: simple operation, simple equipment, safety, low consumption, less pollution.

Description

technical field [0001] The invention relates to a preparation method of spinel type ferrite, in particular to a method for preparing spinel type ferrite under normal pressure and 80-100 DEG C crystallization conditions. The material has certain application value in catalysis, catalyst carrier and electromagnetism. Background technique [0002] With the development of miniaturization of electronic products, it is particularly important to prepare high-density, uniform, nano-sized soft ferrite. The structural formula of spinel ferrite is AB 2 o 4 (A and B respectively represent divalent metal ions and trivalent metal ions), the soft magnetic ferrite nanomaterial has low melting point, high specific heat, large expansion coefficient, low saturation magnetic moment, high magnetic susceptibility, wide light absorption frequency, The advantages of superparamagnetism, high coercive force, low Curie temperature, high magnetic susceptibility and good magnetic spectrum characterist...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/626
Inventor 徐庆红魏亚波刘耀
Owner BEIJING UNIV OF CHEM TECH
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