Process for the treatment of a quartz sand or quartz glass grain

摘要

Method for treating a quartz sand or quartz glass grain (11) with a specific angle of repose (β) in the range of 25 to 36 degrees, in which the grain (11) is fed continuously via a grain inlet (7) to a heated treatment space (2), heated and gravity transported to a Körnungsauslass (8) and continuously discharged from the treatment chamber (2), wherein the grain (11) over at least a portion between Grannungseinlass (7) and Körnungsauslass (8) as a grain layer (18; 45) on a within the treatment chamber (2) arranged first chute (3; 43) which ends at a transfer opening (6) above the Körnungsauslasses (8), wherein the grain (11) one between a gas inlet (9) and a gas outlet (10) is subjected to flowing treatment gas, wherein the granulation layer (18; 45) has a minimum thickness of less than 5 cm and the first chute (3; Sliding surface which includes a cascade angle (α) with the horizontal, which is greater than 5 degrees greater than the specific angle of repose (β) of the grain (11).