Device for the thermal treatment of mineral material with a tendency to form dust

The present invention relates to a device 10 for the thermal treatment of mineral material, the device 10 having a main preheater 20 and a main treatment reactor 30, the main preheater 20 and the main treatment reactor 30 being connected for transferring the mineral material heated in the main preheater 20, the device 10 further has a first dedusting device 40, with the main preheater 20 being connected to the first dedusting device 40 in a gas-carrying manner, characterized in that the device 10 has a secondary preheater 50 and a secondary treatment reactor 60, with the secondary preheater 50 and the secondary treatment reactor 60 for transferring the in the secondary preheater 50 heated mineral material are connected, wherein the first dedusting 40 and the auxiliary preheater 50 are connected to transfer the separated in the first dedusting 40 material.