Explanation

Modern ironmaking method with blast furnace as the main equipment. Iron ore (natural rich ore block, sintering, pellet), coke and flux are added into the furnace from the furnace top according to the predetermined proportion of ingredients and move downward. Hot air preheated to 800-1350 ° C is blown into the furnace hearth from the tuyere to generate a large amount of reducing gas and move upward when coke and other auxiliary fuels combustion. A series of physical and chemical reactions occur during the process of blast furnace gas heating the furnace charge, so that the iron ore is reduced to liquid iron. Released through the tap hole, used for steelmaking or direct casting castings; The gangue and flux in the ore form slag, which is discharged from the slag outlet and quenched into water slag to produce slag cement; In addition, the blast furnace gas discharged from the furnace top can be used as an important gas fuel. In order to improve production efficiency, reduce production costs and save energy, advanced technologies such as pulverized coal injection, oxygen enriched blast and high furnace residual pressure recovery are widely used. The process of blast furnace ironmaking is relatively simple, with large output, high productivity and low energy consumption. The pig iron produced accounts for more than 95% of the world's iron output.

Classification