Spheroidic ball mill barrel and method for fine pulverizing of permanent magnetic ferrite through spheroidic ball mill barrel

A permanent magnet ferrite and ellipsoid technology, used in grain processing and other directions, can solve the problems of large abnormal growth ratio of magnet crystals, unstable magnet performance, large loss of lining plates, etc., to achieve efficient grinding of raw materials, improve ball milling efficiency, Improve the effect of mechanical energy

Pending Publication Date: 2018-11-30
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After dismantling a scrapped ball mill, it was found that the liner plates on both sides of the conventional ball mill barrel had a large loss, and the slurry produced by the analysis generally had a wide particle size distribution, a long molding time, and a magnet after pressing and sintering. Problems such as large proportion of abnormal crystal growth and unstable magnet performance

Method used

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  • Spheroidic ball mill barrel and method for fine pulverizing of permanent magnetic ferrite through spheroidic ball mill barrel
  • Spheroidic ball mill barrel and method for fine pulverizing of permanent magnetic ferrite through spheroidic ball mill barrel
  • Spheroidic ball mill barrel and method for fine pulverizing of permanent magnetic ferrite through spheroidic ball mill barrel

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Embodiment 1

[0032] Such as figure 1 and figure 2 Said: an ellipsoidal ball mill cylinder, the inner wall of the cylinder 1 is provided with a number of reinforcing ribs 2 evenly distributed along the inner wall, and the reinforcing ribs extend from one end of the polar axis of the ellipsoidal cylinder to the other end, The surface of the reinforcing rib close to the inside of the barrel has an arc-shaped depression 3 . The ratio of the polar radius of the cylinder to the two equatorial radii is 1.5:2:1. The rib is in the shape of a cuboid, the ratio of the width of the rib to the longer pole radius is 1:50, and the ratio of the height of the rib to the longer pole radius is 1:40. The number of the reinforcing ribs is 12. The central angle of the concave arc-shaped surface is 80°.

[0033] A method for finely pulverizing permanent magnet ferrite with an ellipsoidal ball mill cylinder, comprising the following steps:

[0034] (1) Add 2.5T of the raw material to be ball milled into the...

Embodiment 2

[0039] The difference between embodiment 2 and embodiment 1 is that in the first stage, the rotating speed of 31r / min is adopted, the ball milling is rotated clockwise for 1 hour and then counterclockwise for 1 hour, and the ball mill is alternately circulated for 4 hours. In the second stage, use a rotating speed of 24r / min, rotate clockwise for 1 hour and then rotate counterclockwise for 1 hour, and alternately circulate the ball mill for 4 hours. In the third stage, use a rotating speed of 20r / min and rotate clockwise for 1 hour. All the other are with embodiment 1.

Embodiment 3

[0041] The difference between embodiment 3 and embodiment 1 is that in the first stage, the rotating speed of 33r / min is adopted, and the ball milling is rotated clockwise for 1 hour and then counterclockwise for 1 hour, and the ball mill is alternately circulated for 5 hours. In the second stage, use a rotating speed of 25r / min, rotate clockwise for 1 hour and then rotate counterclockwise for 1 hour, and alternately circulate the ball mill for 4 hours. In the third stage, use a rotating speed of 20r / min and rotate clockwise for 1 hour. All the other are with embodiment 1.

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Abstract

The invention relates to the technical field of fine pulverizing, and discloses a spheroidic ball mill barrel and a method for fine pulverizing of permanent magnetic ferrite through the spheroidic ball mill barrel. The inner wall of the spheroidic barrel is provided with a plurality of strengthening ribs evenly distributed along the inner wall of the spheroidic barrel. The strengthening ribs extend to the other end from one end of a spheroidic barrel pole axis. The surfaces, close to the interior of the barrel, of the strengthening ribs are provided with arc concave parts. Welding of a liner plate is not needed for the barrel, and the problems that losses of liner plates on the two sides in a traditional cylindrical ball mill barrel are large, and abrasion of linings of cover plates on thetwo sides is fast are solved. The spheroidic barrel can be adopted for well scattering impacts caused by movement of steel balls, raw materials and a dispersing agent towards the two ends of the barrel, the whole barrel is evenly stressed, ball milling uniformity is improved, and the ball milling efficiency is improved. By the adoption of the barrel and the fine pulverizing method, the ball milling time is shortened, grain size distribution of obtained slurry is centralized, the yield is improved by 10%, residual magnetism is improved by 1%-3%, and the intrinsic value is improved by 3%-5%.

Description

technical field [0001] The invention relates to the technical field of fine crushing, in particular to an ellipsoidal ball mill cylinder and a method for finely crushing permanent magnet ferrite. Background technique [0002] Fine crushing of ferrite is a very important link in the ferrite production process. It is to coarsely crush the pre-fired ferrite to obtain coarse powder, and then further finely crush to obtain a finer particle size slurry for molding. The raw material is a material with a low density and a relatively loose ferrite crystal structure, and the raw material is refined to obtain a slurry through a fine crushing process, so that it has a good particle size distribution and good chemical reactivity for secondary sintering. Better blank formability plays a very important role in obtaining magnets with good performance and high yield. [0003] The particle size distribution of the slurry after fine crushing is an important factor affecting the molding perfor...

Claims

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Application Information

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IPC IPC(8): B02C17/22B02C17/10
CPCB02C17/10B02C17/22
Inventor 李军华吴云飞杨武国金志洪
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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