Production Practice of Using Low Grade Lump Ore in BF to Reduce Cost at ZNIS
Faced with the increasingly severe situation of domestic iron and steel enterprises,blast furnaces urgently need to reduce the cost of pig iron by optimizing the structure of the charge at ZNIS,especially by using some low-grade lump ore.On the basis of the comprehensive evaluation of the metallurgical performance of low-grade lump ore,the technical personnel of ZNIS adopted the method of the combination of Changxian main lump PB lump and low-grade lump ore in the production.The small proportion of PB lump was used first,and then the proportion of PB lump was adjusted according to the running condition of the blast furnace.After careful adjustment of the blast furnace operation,the condition of the fur-nace was ensured.The cost of hot metal was reduced by replacing Changxian PB lump ore with low grade lump ore by strengthening screening and adjusting material.