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The glazed glaze is sent to the roller kiln for firing by the conveyor belt. The main fuel of the roller kiln can be diesel, natural gas or producer gas, and the firing temperature can reach above 1200 °C. The kiln can be divided into three zones from the whole temperature change: pre-tropical zone, firing zone, cooling zone, and the firing time and temperature of each zone are strictly controlled by computer. The bricks that have been fired at high temperatures have undergone a qualitative change, and this has become a true tile.