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Magnetic grinding machine magnetic material manufacturing process

The production of magnetic materials is based on materials, and sintering is the key. In materials production and manufacturing processes, crushing is the key.
1, the particle size is more fine, more efficient
The vertical ball mill has a stirring speed of about 50-60 rpm, and the magnetic grinder has a stirring speed of more than 900 rpm. Because the use of media smaller than the vertical sand mill, the smaller the media diameter, the more the number of particles per unit volume, the greater the total surface area, the greater the specific surface area ratio, the greater the actual friction contact area during crushing, The higher the smashing efficiency is, the higher the smashing efficiency is. On the one hand, because the medium ball is relatively large, the maximum average particle size D50 of the vertical ball mill is about 1um, while the average particle size D50 of the magnetic grinder is 0.5um. Actual demand particle size, control. On the other hand, compared with the vertical ball mill, the sanding time can be greatly shortened due to the improvement of the sanding efficiency. Unit energy consumption is reduced. Taking a 1L sand mill as an example, vertical sanding requires more than 60 minutes of sanding to achieve the corresponding particle size requirements. Generally, a magnetic mill can achieve the same particle size requirements in 15 minutes.
2, uniform particle size distribution, no secondary peak
aBecause of the vertical ball mill, there is a certain distance between the agitating stick and the bottom, and the center of gravity of the steel ball in the bottom area is larger. Without the agitating force of the agitating stick, the medium ball stops. The slurry in this area is especially far away from the discharge port. Slurry formation crushing dead angle. The particle size distribution of the slurry is large. When the same D50 particle size, it is easy to form a multi-peak state, the pattern difference is very large, resulting in unstable material quality, as shown below:
The X axis is the size distribution of the slurry, the unit is um, and the Y axis is the percentage of each particle size. unit(%)
The structure of the B magnetic mill is a cavity seal, and the chamber is designed with reasonable media without stacking and dead angles. The particle size distribution is better after the slurry is crushed. When the same D50, the particle size distribution pattern is a unimodal form. Therefore, the material quality is compared. stable,
3, energy consumption
The current vertical ball mill power is generally 45Kw/tablet (high and low speed), the material processing capacity per hour is 400kg, while the existing 50L power of the magnetic grinder is 45kw/set, the material processing capacity per hour is 800kg, and the production capacity is increased by 100%. Reduced energy consumption by about 50%

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