The raw material that is required for the cement production process is quarried in accordance with the characteristic raw material data by blasting, extraction by hydraulic excavators or ripping. The pre-reduction plant breaks the extracted material to the particle size required by the downstream raw mill.

The raw material to be broken is delivered to the feed hoppers of the crushing plant by heavy trucks or other transport machines. The discharge device underneath the feed hopper then conveys the material at a controlled flow rate to the crusher.

Depending on the material's properties and the method of extraction, very different types of crushing plant are used for breaking the raw material. Polysius installs crushers from renowned manufacturers, often using the products of our affiliated company Fördertechnik.