Agitated Small Wet Milling Machine Comminution / Emulsifying Adjustable Speed

Wet milling ,Comminution and Emulsifying Equipment ,Bead mill machine

Product Description

Grinding media using 

Agitated small media mills are the final link in the evolutionary chain to reach nanometer particle size distributions and will be covered more thoroughly (by small media, we are not referring to the size of the mill, but the size of the media). This type consists of a vertical or horizontal grinding chamber, an agitator that is a rotating shaft equipped with agitator elements, a drive motor, and a media separator (located at the mill’s discharge). The agitator elements are typically disks or pins. The grinding chamber is filled with grinding media up to 95 percent of the mill volume. The grinding media can be made from materials such as stainless steel and glass, as well as advanced ceramic materials such as yttrium-stabilized zirconium oxide and cerium-stabilized zirconium oxide, and can range from as large as 10 mm dam to as small as 30 microns diam. The grinding media charge is activated by the rotation of the agitator shaft to create mechanical hydraulic shearing and particle impact. In agitator bead mills, the forces tear apart the solids suspended in a suspension as they are pumped through the grinding chamber.
 

Product  Advantages

• Ultrafine grinding and dispersing technology, applicable for materials with different viscosities
• Ceramic (zirconia/ carborundum) grinding chamber to avoid pollution and improve purity of the material
• Mechanical seal with special design to facilitate stable operation
• Patented centrifugal discharge solution of Boyee which solves the blockage problem
• Better evenness for grinding with narrower peak of the distribution curve
• Independent electric box, optimized process control system and intellectual technology to help monitor the operation data
• Unique design for profile with reasonable structure and small space occupancy
• Equipment remain stale and quiet with little noise while running
• Ultrafine grinding media (as fine as 0.05mm) can be utilized without leakage or damage to the surface properties of the material

Description

In operation, a premix suspension containing the coarse material is pumped through the mill from a feed tank. The material flows into the grinding chamber and downward into the spaces between the grinding media. The agitator rotates at typical tip speeds between 4 and 20 m/s. The media move around the chamber and impart impact, compression, and shear forces to the suspended particles, fracturing or dispersing them. The suspension can be recirculated multiple times (known as high flow recirculation) with each pass having a short residence time in the mill chamber (approximately 30 seconds) until reaching the end product fineness specification, or pass only once (passage mode) through the mill to a product tank with a longer residence time in the mill chamber (1–2 minutes).

Each mode has advantages and disadvantages. The main advantage of passage mode is simplicity for those applications where the end particle size can be reached in a single pass or at most two passes. However, there’s no guarantee that every particle passes through the mill’s highest-energy zones; therefore the final particle size distribution (PSD) may be wider than desired.

There are two variations of passage mode--pendular and serial mode--to potentially address this issue. Pendular mode ensures that more of the particles pass through the bead mill’s highest-energy zones. Using a high flow rate and two or more passes, the required particle size and a steeper PSD may be reached with a lower total residence time. This mode’s higher flow rate also results in less material heating, but the material is handled two or more times, which is undesirable in some applications.

The serial mode allows the use of two mills with different grinding media sizes a larger size in the first mill takes a coarse feed material to a size that allows the next mill to use finer media to reach the final desired particle size. In this way two-step grinding is accomplished in a single process.

If the material requires more than two or three passes, the high flow circulation mode may be the best option. In this mode, all particles ultimately pass through the bead mill’s highest-energy zones and achieve the steepest PSD and finest particle size. The circulation mode’s high flow rate also gives the material a short residence time, keeping both the material and the mill cooler and allowing accurate control of the material temperature.

Operational safty

     For increased operationaly safety,The mechanical seal fluid is monitored continously.These data can be documented and used for predictive maintenance to ensure high availability of the machine

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