Preheating Kiln

Remove water and other volatile components from the smelting furnace charge material with Metso's Outotec Preheating Kiln.

Preheating stabilizes conditions in the smelting furnace, decreasing specific energy consumption.

Uses CO gas from the electric furnace as fuel
Preheats up to 600ºC, with every 100ºC saving 70 kWh per metric ton of metal in smelting
Increases smelting furnace capacity by up to 20%
Results in more stable smelting furnace operation while minimizing coke and electrode paste consumption
Offers a gas-tight structure and clean working environment

Operation

Preheating Kiln

Metso's Outotec Preheating Kiln is a refractory-lined, shaft-type kiln where smelting charge materials are preheated to 600°C by burning cleaned carbon monoxide (CO) gas from the closed smelting furnace. Every 100°C increase in preheating saves approximately 70 kWh of power consumption per ton of metal in smelting. Preheating can increase furnace capacity by up to 20%, and it minimizes coke and electrode paste consumption. Furthermore, the gas-phase pressure of the furnace is also easier to control when using a dry, preheated charge.