Analysis and calculation of steel scrap melting in multifunctional hot metal ladle

In order to improve the scrap ratio in the steel production process, the scheme of adding scrap to the multifunctional hot metal ladle before loading to the blast furnace was proposed. The process of steel scrap melting in the multifunctional hot metal ladle was analyzed and studied by thermodynamic calculation and numerical simulation. The results show that the steel scrap has enough time to get the ideal preheating temperature in the ladle. The impact potential energy of hot metal, discharged from blast furnace tapping hole, can effectively promote the melting process of large scrap steel. When the specific surface area of the steel scrap is 1.6 m2/t and the preheating temperature is 800 ℃, the melting time per ton of steel scrap is about 11.5 min. Meanwhile, the melting of steel scrap in ladle is also greatly affected by the preheating temperature. For medium sized steel scrap with specific surface area of 3.3 m2/t, the melting time per ton of steel scrap decreases from 8.5 min to 6.8 min when the preheating temperature increases from 300 ℃ to 800 ℃. © 2019, Central South University Press. All right reserved.