A DEVICE AND A METHOD FOR CARRYING OUT CHEMICAL AND/OR PHYSICAL REACTIONS BETWEEN A SOLID MATERIAL AND A GAS AS WELL AS A PLANT FOR CEMENT MANUFACTURE

The device according to the invention for performing chemical and/or phys ical reactions between a solid material and a gas, particularly for preheati ng, cooling, and/or calcining fine-grained materials, is made substantially of a helical and/or spiral pipe in which the gas-solid suspension is separat ed into a solid stream and a gas stream by centrifugal forces, and at least one deposition area connected to the end of the helical or spiral pipe, a so lid material pipe for removing the solid stream and a gas pipe for removing the gas stream being connected to said deposition area. The deposition area is formed by a lower part of the gas pipe, the deposition area in the area o f the opening of the helical and/or spiral pipe and the part of the gas pipe connecting thereabove having the same diameter. The helical and/or spiral p ipe opens to form a twisting flow tangential to and at an angle of at least 30° to the horizontal in the deposition area.