A method for improving the grinding efficiency of permanent magnet ferrite calcined material

Abstract

A method for improving the grinding efficiency of permanent magnet ferrite calcined material. The method of the invention is to add ferric chloride or ferrous chloride to the calcined material before wet grinding, and then wet grind to obtain slurry. During the grinding process of permanent magnet ferrite calcined powder, due to the gradual refinement of the powder particles, the specific surface area and surface energy of the particles increase, the viscosity of the slurry increases, and the fluidity becomes poor, resulting in a decrease in grinding efficiency. The ferric chloride or ferrous chloride added by the method of the present invention can be adsorbed on the surface of the slurry particles during the grinding process, significantly reducing the surface energy of the slurry particles, overcoming the attraction between the particles, reducing the crushing resistance, and improving the slurry particle size. Fluidity, thereby improving grinding efficiency.

Description

technical field [0001] The invention relates to the technical field of permanent magnet ferrite preparation, in particular to a method for improving the grinding efficiency of permanent magnet ferrite calcined material. Background technique [0002] Permanent magnetic material, also known as hard magnetic material, is a material that can provide a constant magnetic field to the outside world after magnetization. It is mainly used in various motors and generators. The main process of manufacturing permanent ferrite magnets includes: metering of pre-sintered materials and formulas-grinding powder making-magnetic field forming-high temperature sintering-grinding and packaging. [0003] In recent years, with the tightening of energy-saving and environmental protection regulations and the demand for equipment miniaturization and light weight, the demand for high-performance ferrite has continued to expand. Due to the magnetic properties of permanent ferrite and single-domain part...

AI Technical Summary

Problems solved by technology

The total time of the process is more than 20h

[0005] CN102553683A discloses a crushing process of permanent magnet ferrite calcined material, which is divided into two stages, wherein in the first stage, the rotating speed of the ball mill is 26-35 rpm, and the grinding time of this stage is 6-9 hours; the second stage The rotation speed of the ball mill is 19-22 rpm, and the grinding time is 7-10 hours. The ribs on the two ends of the ball mill cylinder are convex upward in an arc shape. It is preferable to use 2 ball mills. The first stage controls the powder: ball : the mass ratio of water is 1: (4~6): (1.2~1.6), the second stage control material powder: ball: the mass ratio of water is 1: (4~6): (1.4~1.8); The grinding time of the process is shortened by 20% to 35%. This crushing process can shorten the grinding time to 13 hours at most. However, this process needs to improve the ball mill according to the parameters such as the particle size and hardness of the pre-fired material, and the cost is high. The scope of application narrower

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