Short Rotary Furnaces typically employ batch feeding in a cycle of tapping slag and bullion. The mechanical mechanism of feeding depends on the type of feed and sophistication of infrastructure, but usually is one of;
- Dosing hoppers feeding a drag link or belt conveyor.
- Fork Lift Truck with turntable emptying a cylindrical pod.
- Dosing hoppers feeding a screw conveyor housed within an overhead crane.
- Vibratory feeder, which inserts and retracts into the SRF port via rails.
Inprotec Ltd has developed an SRF furnace feeding system which can accept material from skips, and hoists the skip and empties into a vibratory feeder. This mechanism has been employed on a railed system and wheeled with steering system. The wheeled system is particularly useful if the SRF has an open area at the feeding port which needs to be kept clear inbetween feed cycles.
TBRC Vibratory Feeder (Batch)
Inprotec Ltd has developed a retractable vibratory feeder for the TBRC which allows the operator to charge the feeder using our pneumatic clam shell hoppers and then retract from the port of the TBRC so it can tilt back to the firing angle.
TBRC Screw Feeder (semi-continuous)
Inprotec Ltd has developed a water cooled retractable screw feeder which can enter the TBRC port during the firing/blowing cycle and gradually enter charge under the close control of the operator. The screw feeder is dosed using loss in weight feeders, which in turn are charged using our pneumatic clam shell hoppers. Feeding semi-continuously is advantageous when the process cycle requires a high process temperature, such as PGM treatment using Iron as the carrier metal. For batch feeding there is a process cool down while the TBRC burner is extinguished and the vessel is tilted to a pouring station, tilted back to the firing position and the burner is reignited. The charge then needs to melt. In semi-continuous feeding, the TBRC fires continuously and the charge is added slowly so that the process heat can be used to melt the charge almost instantly. This can continue during the blowing cycle as the exothermic oxidation reaction heat is used to melt the charge.
TBRC Clam Shell Hopper
Inprotec Ltd have developed a pneumatic clam shell hopper which can be used to charge the TBRC directly from the roof platform while it is in the vertical position, or it can be used to feed vibratory feeders or dosing hoppers.