among non-ferrous and ferrous metallurgy, iron, aluminum, copper, zinc, tin, nickel, tungsten, chromium, burrs and so on metals, use rotary kiln as smelting equipment, sinter, roast and direct return the ore, concentrate and intermediate. For example, during aluminum production, this is used to roast aluminum hydroxide to produce alumina; during iron making this is used to produce pellets for blast furnace.
