Preparation method of nanoscale hercynite

Abstract

The invention relates to a preparation method of nanoscale hercynite. The method comprises steps as follows: (1) a mixed solution of N,N-dimethyl formamide and water is prepared, wherein the volume fraction of the N,N-dimethyl formamide ranges from 65% to 85%; (2) an aluminum-containing compound, terephthalic acid and ferric acetylacetonate with the molar ratio being 15:10:3 are added to the solution prepared in Step (1) and evenly stirred, and a reactant solution is prepared; (3) the reactant solution prepared in Step (2) is aged in an airtight manner, then cooled to the room temperature and subjected to solid-liquid separation, and a hercynite precursor product is obtained; (4) the hercynite precursor product is placed in a high-temperature furnace for calcination and then cooled to the room temperature, and the nanoscale hercynite is obtained. Compared with the prior art, the preparation method has the advantages that the synthesis process is simple, the method is convenient to operate, the cost is low, the energy consumption is low and the like.

Description

technical field [0001] The invention relates to a preparation method of nanometer materials, in particular to a preparation method of nanoscale iron-aluminum spinel. Background technique [0002] There are many kinds of spinel-type composite oxides and they are widely used. Different cations entering the spinel structure can have many different charge combinations. The distribution of cations in the spinel structure is not only related to the chemical composition, but also related to the charge of the constituent cations, crystal chemistry and the physicochemical environment during formation. Spinel composite oxides can be used as pigments, catalytic materials, magnetic materials and other applications. With the continuous deepening of people's understanding and research, its application range in practice is also becoming more and more extensive. Recent studies have shown that oxygen-deficient spinel ferrite has a good prospect in the control of air pollution, which can b...

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Problems solved by technology

The sintering method uses metallic iron and alumina as starting materials. Iron can only form ferrous oxide in a weakly reducing atmosphere, and then react with alumina to form iron-aluminum spinel. The key to the synthesis is to strictly control the reaction atmosphere to be weakly reducing. The reaction conditions are not easy to control during the specific implementation of this method (patent publication number: CN102583462A), and in order to be applicable to high-temperature tunnel kilns, rotary kilns and shaft kilns commonly used in industrial production, etc. cannot guarantee good sealing, the obtained iron-aluminum The yield of spinel products is not high, and the particle size is not uniform

The iron-aluminum spinel synthesized by electrofusion has the advantages of high purity and large crystal size, but the obtained iron-aluminum spinel has high thermal conductivity (patent publication number: CN102503478A)

At present, the electric melting method is mostly used to produce iron-aluminum spinel at home and abroad, but the electric melting method consumes a lot of energy and is expensive. It is more and more urgent to find a suitable synthetic method for iron-aluminum spinel.

[0005] However, there is little research on the method of preparing nano-scale spinel. The key to preparing nano-scale spinel is to control the size of the particle size and obtain a narrow particle size distribution. The existing research methods cannot obtain ideal nano-scale spinel. grade spinel

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