Device for colour optimisation of activated clays

A device for thermal activation of mineral materials, comprising:

• a calciner;
• a reduction device;
• and
• a material cooler;
• wherein the calciner and the reduction device are connected to one another via a first connection for transfer of calcined material;
• wherein the reduction device is connected to the material cooler at least via a second connection for transfer of color-optimized material;
• wherein the reduction device is a fluidized bed reactor;
• wherein the reduction device includes a first material output and a second material output;
• wherein the first material output and the second material output are each connected to one another to the material cooler for transfer of color-optimized material;
• wherein the reduction device includes a gas outlet connected to a gas purification device via a fourth connection;
• wherein the gas purification device includes a solids outlet;
• wherein the material cooler includes at least a first inlet for material to be cooled, a second inlet for material to be cooled, an outlet for cooled material, a cooling gas inlet and a cooling gas outlet;
• wherein the first inlet for material to be cooled is arranged fluidically closer than the second inlet for material to be cooled to the cooling gas inlet;
• wherein the solids outlet is connected to the first inlet for material to be cooled via a third connection for transfer of material precipitated in the gas purification device;
• wherein the first material output and/or the second material output is connected to the second inlet for material to be cooled via the second connection for transfer of color-optimized material.