92
S. Takaya et al.
Fig. 1 Process chart of Shisaka smelter
Fig. 2 Changes in amount
of EAF dust treated
is a recovery loss, leading to increased processing cost. Under circumstances where
the amount of incoming EAF dust is decreasing, it is especially important to improve
the zinc recovery rate for cost improvement.
Initially, the granulation process preceding the reduction roasting process was
extremely inefficient. It was performed using a crusher with a ball mill, a granulator
with a pan-type pelletizer, and a dryer and was connected on-line to the reduction
roasting process. However, the pellets were weak and often burst in the RRK, so the
granulation process was changed to one in which the EAF dust was directly charged
S. Takaya et al.
Fig. 1 Process chart of Shisaka smelter
Fig. 2 Changes in amount
of EAF dust treated
is a recovery loss, leading to increased processing cost. Under circumstances where
the amount of incoming EAF dust is decreasing, it is especially important to improve
the zinc recovery rate for cost improvement.
Initially, the granulation process preceding the reduction roasting process was
extremely inefficient. It was performed using a crusher with a ball mill, a granulator
with a pan-type pelletizer, and a dryer and was connected on-line to the reduction
roasting process. However, the pellets were weak and often burst in the RRK, so the
granulation process was changed to one in which the EAF dust was directly charged