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Oxygen, silicon, and aluminum together account for 90% of the elements in the earth’s crust , These, together with other minerals compounds of oxygen, constitute the greatest bulk of naturally occurring ceramic raw materials.
A roller tunnel kiln for firing a drying refractory material advanced along the refractory rotatable rollers includes an upper section comprising a prefiring zone, a firing zone, a first forced cooling zone, a natural cooling zone and a second forced cooling zone.
Roller Hearth Kiln Firing zone Gear system Entrance