Iron dust and mudSolid waste obtained from wet dust removal and wastewater treatment during the process of steel production, including raw material preparation, sintering, pelletizing, ironmaking, steelmaking, and rolling, accounting for about 10% of steel production. Mainly includes: sintering dust sludge, pelletizing dust sludge, blast furnace gas sludge, steelmaking dust sludge, converter sludge, etc. The total iron content in these dust sludges is generally between 30-70%.

　　Dust ash:The metallurgical process of China's steel enterprises primarily focuses on the sintering—blast furnace—converter—steel rolling long production line, accounting for over 70% of the total steel production capacity. Dust and by-products generated in various processes such as sintering, blast furnace ironmaking, converter, and electric arc steelmaking are collectively referred to as dust removal ash. Mainly including: blast furnace gas slag, electric furnace dust removal ash, raw material yard dust collection, and slag field dust collection, etc.

　Iron oxide skinIt is an iron oxide formed on the surface of steel after it is rapidly cooled with water during the rolling process in a rolling mill. It accounts for 3% to 5% of the processed steel, with a w(Fe) content of up to 80% to 90%. Steel forging and hot rolling,Hot processingDue to the reaction between steel and oxygen in the air, iron oxide scales often form in large quantities, leading to accumulation and waste of resources. Proper utilization of these resources can reduce production costs while also contributing to environmental protection and energy conservation.