Method for preparing spinel ferrite powder

Abstract

This invention relates to a method for preparing spinel-type ferrite powder. The procedures are: (1) weighing, according chemometrics ratio of the components, the raw materials: Zn(NO3)2, Fe(NO3)3, Mn(NO3)2 and rare-earth metals nitrates, mixing them evenly to produce metals nitrates solution; (2), mixing egg-white and distilled water with ratio of 3:2, under room temperature agitating to produce egg-white water solution, (3), adding said nitrates solution into egg-white solution slowly and agitating, (4), strong agitation for 1.5-2.5hrs, until the solution is changed from thick paste into yellow brown emulsion, (5), putting the same in a water-bath under temperature of 80+-5deg.C, for heating 8-12hrs, to obtain pre-product, (6), milling the same, and then being sintered under temperature 450-700deg.C for 3-7hrs, (7), it is then quickly cooled in ice-water, (8), drying the same under 100deg.C to obtain the final product. This invention has advantages: simple operation, low cost, mild condition, low toxity and low corrosion.

Description

(1) Technical field [0001] The invention relates to a method for preparing an inorganic non-metallic magnetic material, in particular to a method for preparing spinel ferrite powder. (2) Background technology [0002] Because ferrite has good performance, low cost, simple process and can save a lot of precious metals, it has become a promising magnetic material in the field of high frequency and weak current. Spinel ferrite is a ferrite material with wide application, large quantity, many varieties and high output value. It is mainly used in various inductive components, such as filter cores, transformer cores and tape recording and video recording. Fields such as magnetic cores of recording heads, etc. However, in the current preparation method of spinel ferrite, the chemical co-precipitation method is easy to introduce impurities, and colloidal precipitation often occurs in the precipitation process, which is difficult to wash and easily causes the agglomeration between p...

AI Technical Summary

Problems solved by technology

However, in the current preparation method of spinel ferrite, the chemical co-precipitation method is easy to introduce impurities, and colloidal precipitation often occurs in the precipitation process, which is difficult to wash and easily causes the agglomeration between particles, so that larger particles are formed after sintering; spray heat The gas produced during pyrolysis in the solution method is often corrosive, which directly affects the service life of the equipment, and at the same time has extremely high requirements on the reaction device (such as the atomization chamber, etc.); the traditional sol-gel method needs to adjust the pH value to form a complex , the introduction of new substances will increase the cost of the reaction, and this will often cause a large amount of air pollution, which will seriously affect the health of the staff; the hydrothermal synthesis method uses water as the medium for heterogeneous reactions, and the required raw materials are of high purity and relatively low cost. High, an autoclave is needed in the reaction, and the process is complicated; the ball milling method has developed various ball milling methods for different purposes, but this method is difficult to achieve high purity standards

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