Yttrium stabilized zirconium beads: wear-resistant zirconia beads for various sand mills
The initial prototype of the sand mill is the traditional horizontal rolling ball mill and vertical stirring ball mill. Its advantage is that the particle size range of the initial material processed is wide, and both coarse and fine grinding are available in some fields, but the disadvantage is high energy consumption and high noise. Grinding beads (such as ceramic balls, zirconia beads, etc.) with a diameter of 3-100mm are usually used.
Centrifugal sand mill: The high-speed rotating grinding cylinder and the low-speed rotating shaft generate radial centrifugal force to force the material to complete dispersion and grinding in the shear zone away from the shaft separator, which can process ultra-fine and low-viscosity materials, grinding beads The particle size can be selected in the range of 0.05-0.80mm. Zirconia beads are recommended.
Open vertical sand mill: It is improved from the vertical stirring ball mill, and adopts the method of bottom feeding and top open discharging to realize continuous production of large flow. The volume can reach 5000L, and the compressive strength of the beads is low. It is recommended to use ceramic beads for 2.0-3.0mm vertical sand mill.
Traditional horizontal sand mill: It can be considered that the grinding cylinder of the closed vertical sand mill is horizontally formed, which increases the filling amount of beads and improves the grinding efficiency. Use zirconia beads with a size of 1.0-3.0 mm of grinding beads.
Bar pin horizontal sand mill: one of the revisions of the traditional horizontal sand mill, changing the dispersing disc into a bar pin. Typically zirconia beads of 0.6-2.0mm particle size are used.
Closed vertical sand mill: The discharge port at the top of the open vertical sand mill is limited to flow, and it works with pressure, which can handle materials with relatively high viscosity. Small, usually use grinding beads with a size of 0.6-3mm, which can be configured with zirconium silicate beads or zirconia beads.
Turbine horizontal sand mill: It is one of the revisions of the traditional horizontal sand mill, changing the flaky dispersion disc into a thick turbine with an inner cavity. Grinding beads with a size of 0.4-2.0mm are usually used, and zirconium silicate beads or zirconia beads are recommended.
Special-shaped dispersing disc sand mill: By using different shapes of dispersers, such as gear-shaped, eccentric and tower-shaped, to change the way of transmission capacity, the ultimate goal is to change the direction of movement of the beads and increase the return rate, thereby reducing the beads. Generation of stacking and delamination. Grinding beads of 0.6-2.5mm diameter can be used. Depending on the shear force, zirconium silicate beads or zirconia beads can be selected.
Special-shaped cylinder sand mill: there are usually two types: conical horizontal type and octagonal vertical type, which can improve the useful work ratio of grinding beads by changing the flow gradient and direction of grinding beads and slurry. Usually 1.0-2.0mm zirconium silicate beads are used as grinding media.
Basket-type sand mill: The grinding basket with agitator is immersed in a closed cylinder, and the high-speed rotating turboprop generates eddy current to make the material continuously disperse and grind through the high-speed moving grinding beads in the basket. The particle size of the grinding beads can be selected between 1.0-3.0mm. Usually zirconium silicate beads or zirconia beads are used.
Ring type sand mill: The "W" grinding channel is formed by the rotor (shaft) and the stator (grinding cylinder with special structure). On the one hand, the residence time of the material in the grinding cylinder is increased by increasing the grinding channel, and on the other hand, the cooling system is increased The heat dissipation area can reduce the discharge temperature and improve the grinding efficiency. Beads of 0.4-1.5mm are commonly used sizes. Zirconia beads are recommended.
