M. Mebtoul et al., HIGH-VELOCITY IMPACT OF PARTICLES ON A TARGET - AN EXPERIMENTAL-STUDY, International journal of mineral processing, 44-5, 1996, pp. 77-91
Citations number
11
Categorie Soggetti
Mineralogy,"Mining & Mineral Processing","Engineering, Chemical
In order to study communition in a jet mill, an experimental rig was b
uilt to investigate the breakage phenomena. Particles were accelerated
with air in a nozzle to velocities ranging from 120 to 250 m/s and co
llided with a target. Energy loss during impact was evaluated by measu
ring particle velocities before and after impact. Two different system
s for measuring particle velocities were implemented, ?The first one w
as designed to work at very low loading (particles are considered to h
it the target individually). The velocities are measured by a high shu
tter speed video camera (up to 1 mu s) The particle traces on a frame
were analysed by an image analyser. The second method, used for medium
to high solid loading, consists of two sets of emitter-receptor optic
fibres. Signals, collected by a 500kHz acquisition card, are cross-co
rrelated in order to obtain the velocity. Influence of solid loading a
nd initial air flowrate on characteristics of broken particles were ev
aluated, The influence of target nature and orientation were establish
ed.