Bead Mill: The effective tool for grinding & dispersing

The grinding media or the beads are agitated within the cylindrical vessel for grinding or dispersing minute particles in the slurry is done with the help of an apparatus or bead mill. Shear force, along with the impact on the particles, is induced with the help of the rotor of the mill that is generating the bead motion here. Over a massive range of applications, including the grinding of the larger particles along with dispersing the nanoparticles are done with the help of the bead mill.

Reduction is made effectively into that of the finer particles as well as about tens of the nanometer with the particles that has the sizes of the submicron as well as the microns. The ideal condition for every material is adjusted here with the optimization of the size of the beads, rotor speed, along the kind of the rotor here in terms of the impact force as well as energy.

main parts of bead mill

main parts of bead mill

The importance of the size of the beads selected

In terms of the bead milling process here, the size of the bead is the vital factor included here. To grind the micron-sized particles into that of the submicron sizes, larger beads that are bigger than that of the 0.5mm are pretty adequate here. Smaller beads that are finer with about 0.3 mm are mainly applied to that of the grinding through the bead mill as well as the dispersing of the submicron or that of the nanometer-sized beads.

The smaller beads generally have processing rates that are quite fast here in terms of dispersing, where the larger impacts are not required here. The size of the bead, including the speed of the rotor and the mass of the beads here, are charged in the bead mill machine through the adequate energy impacted in the mill here. It is generally controlled with the help of the speed of the rotor along with the size of the bead affecting the rate of processing is considered as the frequency of the impact made between the particle as well as the bead.
nano Bead Mill

Lab Bead Mill

Bead selection in the process of dispersing

It is quite similar to that of the process involved with grinding with the help of the bead milling process is where the basic idea in terms of selecting the size of the bead is dispersed in the processes involved here. The damage made on the main particles with the impact over the beads here is highly vital among all. It can be enough to tear off the cluster into that of the main particles with the energy of the impact that is needed in terms of dispersion that is controlled here.
dyno mill

dyno mill

Selecting the kind of bead mill

It is extremely vital in terms of making the proper selection of the size of the bead in accordance with the purpose of processing here, as this is also explained in the earlier sections. It is the reason why you need to make the ideal selection through the method of separation of the beads, as it depends on the size of the bead here.

One of the highly vital factors involved in terms of selecting the kind of bead mill is the kind of separation processes of the beads here. They are basically grouped into the screen, slit as well as centrifugation methods since each of them have their own preferred size of the bead here in terms of the bead separation of the bead mill working principle.
horizontal sand mill

horizontal sand mill

Slit separator

This method of the separation of the beads from the slurry with the help of the smaller slit gap at the exit of the slurry is determined by the bead mill working principle. With the help of beads that are of sizes that are 0.3mm or even the larger ones is where the bead mill design comes equipped with the separator functions here. Since the gap here is smaller, it is well-suited for the beads that are of smaller sizes causing the entrapment of relatively coarser particles, and they need the much-required pressure for the slurry to be able to pass through the slits that are greatly rising here.
nano mill

nano mill

Screen separator

The geometry is used for the narrow passes here in terms of the screen at the exit of the slurry here with the help of the separator that is quite similar to that of the slit separator. In terms of separating the beads from the slurry here, the screen contains a mesh that has a texture in it for the metallic wired offering the narrower gaps as the screen has a larger opening area here for the passages for slurry. It also tends to clog due to the coarse particles within the slurry in itself in case of making use of the beads that are smaller here. The slit method can help here, which is less favorable for the higher viscous slurries here.
pearl mill

pearl mill

Centrifugal separator

In terms of separating the beads out from the slurry here, it is considered as the separator using the force of the center. There are plates that can line up in a circular way within the separator. They are quite favorable in terms of bead separation since the plates are inducing the rotation of the fluid here. The force here in the bead mill design is acting as the mode of gravitational screenings as it has a density that is 4 to 5 times in terms of the slurry. There is no clogging that can occur here, even with the beads that are quite small here. It can also be applied over the particles for grinding in terms of the size of the nanometers as well as the submicron.
main parts of bead mill

main parts of bead mill

Comparison of the types of separators

One should be determined initially in terms of the adequate size of the bead while planning for the operation of grinding and dispersing of the bead mill here. The size of the bead here is selected in accordance with the properties of the materials along with the purpose of the processing as offered by the bead mill manufacturers. The kind of separator also has to be selected in terms of the best fit for the kind of bead here after making the choice of the size of the bead here.

The kind of separator offered by the bead mill manufacturers like Franli is the one where they have their own weak and strong points and are chosen in accordance to the characteristics as well as the selected size of the bead.
bead mill

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This article only represents the author’s point of view.
This article is published under the authorization of the author.
Source: Franli

This article address: What is a bead mill?

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