HKP using Carrier-gas Assisted Discharging

摘要

The Simoloyer-mill is well known as a horizontakotary-ballmill that allows high-kinetic energy impact at relative velocity of the grinding media up to 14 ms~(-1). This often leads to very short processing times in the range of some seconds to some minutes for particle- size-reduction, particle-shape-deformation and reactive -milling. If the device is applied for a batch-process, these short processing times result in a major barrier for the scaling up res. the commercialization of the process. The reason is the needed discharging procedure that often needs similar or longer time sometimes even at similar velocity. Thus the material that is discharged e.g. after 1 minute is expected to be different from the material discharged after 2, 3,4 etc. minutes. To solve this problematic, a carrier-gas-discharging unit TGD20 has been developed to rapidly unload processed material out of the vessel of a CM20-Simoloyer (20 liter chamber volume) at low rotational speed in a closed gas circuit under severe oxygen measurement and control. The present paper explains the new device and describes the initial testing after particle size reduction of a glass-system under air as well as soft-MA of a metal-system under inert gas. Results will be given in terms of powder yield/time relation, different gas-flow-velocities and rotational speeds. The materials were characterized by SEM and laser diffraction.