Method for preparing MxR1-xFe2O4 nanometer powder quickly

Abstract

The invention provides a method for preparing MxR1-xFe2O4 nanometer powder quickly, which is characterized by comprising the following steps of: (1) mixing ferrous sulfate heptahydrate and one or more of crystal water-containing metal sulfates according to a molar ratio of M<2+> to R<2+> to Fe<3+> of x:(1-x):2 in a chemical structural formula MxR1-xFe2O4, and putting the mixture in a planet mill,and mixing and grinding for 3 to 5 minutes, wherein x is equal to 0.5 to 1; (2) adding a NaOH solid according to a molar ratio of Fe<2+> to OH<-> of 1:3, performing dry grinding by using the planet mill at two stages, wherein the dry grinding is performed for 8 to 10 minutes at the first stage, and is performed for 5 to 10 minutes at the second stage; and (3) adding deionized water, so that the mass ratio concentration of slurry is between 40 and 50 percent, performing wet grinding by using the planet mill for 5 to 10 minutes, and performing centrifugal separation, washing and drying sequentially to obtain the MxR1-xFe2O4 nanometer powder. In the method, the MxR1-xFe2O4 nanometer powder with an excellent crystal structure and high purity can be synthesized directly without calcining, so the method is high in operability and repeatability, the phenomenon of unstable hand lapping process of mortars in the conventional low-temperature solid-phase reaction method is prevented, energy consumption is reduced, and the method is suitable for industrial production.

Description

technical field [0001] The present invention relates to a M x R 1-x Fe 2 o 4 The invention relates to a rapid preparation method of nanometer powder, which belongs to the technical field of soft magnetic ferrite nanomaterials. Background technique [0002] At present, soft magnetic ferrite nanopowders are prepared by low-temperature solid-state reaction, which adopts the method of artificial grinding, so that the reactant completes part of the solid-state reaction in an agate mortar to form a precursor. Moreover, in the process of grinding and preparation, there will be a phenomenon of strong adhesion to the wall of the grinder, which will cause the reaction to fail or be incomplete. Therefore, the subsequent low-temperature heat treatment process is usually used to heat the precursor to promote the solid phase reaction. Completely, the desired product is prepared. This is also the reason why the traditional low-temperature solid-state reaction preparation technology us...

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Problems solved by technology

This is also the reason why the traditional low-temperature solid-state reaction preparation technology uses manual grinding to control the wall sticking phenomenon instead of mechanical grinding.

However, due to manual grinding, there will be more errors in the experimental process, and the single processing volume is small, and there are certain differences in the experimental conclusions obtained by different operators. The reproducibility is not good, resulting in unstable product performance and cannot be industrialized. Production

Moreover, the subsequent heat treatment process will cause the agglomeration and growth of particles, resulting in uneven particle size and increasing energy consumption.

The traditional high-energy ball milling to prepare soft magnetic ferrite nanopowder is to use Fe 2 o 3 And other oxide powders as raw materials usually require a longer high-energy ball milling time, generally more than 10 hours, to cause the reactants to pulverize the mechanochemical effect, generate the target product, increase energy consumption, and the product purity is not high

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