Van Beek has developed the vertical silo mixer for mixing and homogenising free flowing, dry substances of different sizes and with different bulk densities. The silo mixer creates mass flows within the mixing silo; its operation can be compared to that of a chocolate fountain.
The silo acts as a mixing vessel containing a vertical central tube fitted with a mixing screw. The mixing screw transports the product to be mixed from the bottom to the top and carries it upwards, after which an (optional) distribution plate spreads the product. By gravity and because the mixing screw creates space at the bottom the product next to the mixing screw falls down on its own.
Using a silo as a mixing vessel enables one to mix large capacities and at the same time no residual product is left behind from the previous batch. The diameter of the silo is 3.5 metres and it can hold a maximum capacity of 60-70 m3/hour. Some of the suitable materials that can be homogenised in the silo are dry cattle feed, recycled plastic, grinding stock, etc.