Central Cone Blending Silo

The blending silo is simultaneously used for a continuous blending process as well as for raw meal storage. The feeding of the silo takes place via a novel type of parallel distributor (1) ensuring a controlled build-up of the different material layers. Homogenizing of the raw meal is achieved by causing the layers of different CaCO3 content (2) to flow together by funneling (3) flows and thus merging with one another.

The gravity flow in the funnels produces the blending effect. The bottom of the silo is divided into aeration sections (9). Each section has a flow control gate and an air valve assigned to it. Blowers are available for aerating the silo bottom. As a result, funnels are formed simultaneously developing relatively slowly from the silo bottom to the upper surface of the stored material. The controlled funnel formation process avoids that the fresh raw meal which has just been fed into the silo cannot rush straight through to the silo outlet. The power consumption amounts to 0.1 - 0.3 KWh/t of raw mix.