GRAIN SIZE SELECTION AND/OR MATTER DRYING APPARATUS

摘要

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, the apparatus (30) being primarily constituted of a substantially vertical gas pipe (1) with an ascending flow (Fa) provided with a gas inlet at its base and provided with a lower opening (2) and an upper opening (3) between which a supply opening (4) is also provided for insertion of matter, wherein a portion of the matter, or so-called "fines", can escape with the gas through the upper opening (3) due to the bearing capacity of the ascending flow (Fa), while another coarser portion of the matter is not carried away by said gas and falls into the lower opening (2). According to the invention, the apparatus (30) also has means (5) for creating turbulences, which favor the separation of the different grain sizes and the suspension of matter, and provided at the internal wall of said gas pipe (1), and located between the lower opening (2) and the supply opening (4) of the said pipe (1).