The iron and steel industries have been ranked as the largest industrial source of environmental contamination in China.The steel making process(including,but not limited to,blast furnace and coke oven out put)emits large amounts of smoke dust containing flue gas,slag, fly ashes,etc.When purifying the exhaust,large quantities of filter bags are consumed.As a result of the continuous exposure to high temperatures,large amounts of
fly ash adhere to both the surfaces of,and vacated spaces between,the filter bags.