Abstract
In the roasting process of chromite, the problems such as aggregation of pellets or sticking to the wall cause the irregular operation of the rotary kiln. In order to solve these problems, the duplex-pellet method was proposed for roasting of chromite ore. This pellet consists of core and shell. The shell is intended to play a role to prevent aggregation or sticking by the addition of much residue of roast. The residue which is produced in leaching of the roast of chromite ore has a higher melting point than the conventional roast charge.
In the present study, to research the basic problem of the duplex pellet technology, the conversion ratio of core and shell having various contents of residue was measured and identification of roast by X-ray analysis was also conducted. From these results, the appropriate compositions of core and shell were determined.
