Abstract: A grain size and/or pulverulent-matter drying apparatus for the treatment of suspended mineral particles, at least 90% in weight of which have a size less than 60 mm, primarily includes a substantially vertical gas pipe with an ascending flow provided with a gas inlet, a lower opening and an upper opening between which a supply opening is also provided for insertion of matter. A portion of the matter, or so-called “fines”, can escape with the gas through the upper opening due to the bearing capacity of the ascending flow, while another coarser portion of the matter is not carried away by the gas and falls into the lower opening. The apparatus also has a device for creating turbulence, which favors the separation of the different grain sizes and the suspension of matter, provided at the internal wall of the pipe and located between the lower opening and the supply opening.

Abstract: A grain size and/or pulverulent-matter drying apparatus for the treatment of suspended mineral particles, at least 90% in weight of which have a size less than 60 mm, primarily includes a substantially vertical gas pipe with an ascending flow provided with a gas inlet, a lower opening and an upper opening between which a supply opening is also provided for insertion of matter. A portion of the matter, or so-called “fines”, can escape with the gas through the upper opening due to the bearing capacity of the ascending flow, while another coarser portion of the matter is not carried away by the gas and falls into the lower opening. The apparatus also has a device for creating turbulence, which favors the separation of the different grain sizes and the suspension of matter, provided at the internal wall of the pipe and located between the lower opening and the supply opening.