Steelworks dust recent years, environmental pollution problems in the steel industry more and more people's attention. Waste gas from steel industry critical: 1, raw materials, transportation fuels, handling and processing of a large number of dust exhaust process appear; 2, a large number of dust in the process of all kinds of steel plant furnace again appear and harmful consumption 3, gas consumption process chemical reaction process emissions, such as smelting, burning, chemical products and steel pickling process occurring in the exhaust gas; gas vapor body. Exhaust emissions from iron and steel enterprises are very large, wide surface contamination; metallurgy kiln exhaust gas temperature is high, the steel smelting process emissions, mostly iron oxide dust, small particle size, strong adsorption, increasing the difficulty of the exhaust gas management; In the blast furnace, the slag and steel-making process in a few steps, which appear flue gas emissions have paroxysmal, and because much to fugitive emissions. Iron and steel industry has recycled consumer waste gas values, such as high temperature exhaust heat recovery, coking and iron making, steel-making process in the use of gas appeared, and the recovery of dust containing iron oxide.