An apparatus for removing fluids and/or solids from a mixture of particulate materials, with • a container forming an annular process chamber with a plurality of cells separated from one another by walls comprising an inlet cell, intermediate cells and an outlet cell, • an introduction device for introducing the mixture to be treated into the inlet cell of the process chamber, • a discharge device for discharging the treated mixture from the outlet cell of the process chamber, • a fan device (7, 7') for supplying a first fluidizing agent, in particular in the form of superheated steam, from below into the process chamber through an inflow bottom (24, 24', 24", 24''') for generating a fluidized bed in the process chamber, • a heating device for preparing the first fluidizing agent in flow direction upstream of the fan device (7, 7'), • swirl vanes for conditioning the flow in the container from the process chamber to the heating device and partly to a steam outlet, and • a dust removal device in the flow path between the process chamber and the heating device, wherein dust can be guided to the outlet cell via the dust removal device, wherein for supporting a transport of the mixture from the inlet cell to the outlet cell and/or a swirling of the mixture in the process chamber • the inflow bottom has first irregularities, and/or • at least temporarily a second fluidizing agent, in particular in the form of superheated steam, can be injected substantially parallel to the inflow bottom by means of first nozzles at least into the inlet cell, and/or • first flow guiding members are provided above the inflow bottom and/or second flow guiding members (501, 502, 503, 600, 700) are provided below the inflow bottom (24', 24", 24'''), characterized in that the introduction device for the mixture is connected to the container in the area of the inlet cell, the introduction device supplies the mixture in a loosened state to the inlet cell by a mechanical transport by means of mechanically acting paddles of a screw conveyor, and preheated by applying a third fluidizing agent, in particular in the form of superheated steam by steam injection, into the screw conveyor, wherein the surface of the inflow bottom in the inlet cell is greater than, preferably twice as large as, the respective surface of the inflow bottom of the intermediate cells, and for supporting a transport of the mixture from the inlet cell to the outlet cell and/or a swirling of the mixture in the process chamber first flow guiding members are provided above the inflow bottom and/or second flow guiding members (501, 502, 503, 600, 700) are provided below the inflow bottom (24', 24", 24'''). • a container forming an annular process chamber with a plurality of cells separated from one another by walls comprising an inlet cell, intermediate cells and an outlet cell, • an introduction device for introducing the mixture to be treated into the inlet cell of the process chamber, • a discharge device for discharging the treated mixture from the outlet cell of the process chamber, • a fan device (7, 7') for supplying a first fluidizing agent, in particular in the form of superheated steam, from below into the process chamber through an inflow bottom (24, 24', 24", 24''') for generating a fluidized bed in the process chamber, • a heating device for preparing the first fluidizing agent in flow direction upstream of the fan device (7, 7'), • swirl vanes for conditioning the flow in the container from the process chamber to the heating device and partly to a steam outlet, and • a dust removal device in the flow path between the process chamber and the heating device, wherein dust can be guided to the outlet cell via the dust removal device, • the inflow bottom has first irregularities, and/or • at least temporarily a second fluidizing agent, in particular in the form of superheated steam, can be injected substantially parallel to the inflow bottom by means of first nozzles at least into the inlet cell, and/or • first flow guiding members are provided above the inflow bottom and/or second flow guiding members (501, 502, 503, 600, 700) are provided below the inflow bottom (24', 24", 24'''),