Industrial Application of Bottom–Blown CO₂ in Basic Oxygen Furnace Steelmaking Process

Abstract

A significant amount of CO 2 is emitted and utilized in the production processes engaged by iron and steel enterprises. Herein, the feasibility and principles of CO 2 participation in the steelmaking process are analyzed, and an industrial examination of bottom-blown CO 2 smelting in a 120 t converter is performed; this serves to summarize and verify the metallurgical advantages of CO 2 participation in the converter steelmaking process. The injection of CO 2 improves the effects of dephosphorization and denitrification, reduces the end-point oxygen content of molten steel, diminishes the consumption of the slagging agent, and contributes to a reduction in production costs and improvement in product quality. This study analyzes two different recycling paths of CO 2 in iron and steel enterprises, providing a new mechanism for CO 2 emission reduction.

High‐Efficiency Dephosphorization by Bottom‐Blown O2‐CaO Process for Semi‐Steelmaking

“…Therefore, low temperature, high basicity, and highly oxidizing slag are conducive to dephosphorization. [ 28,29 ]…”

“…Therefore, low temperature, high basicity, and highly oxidizing slag are conducive to dephosphorization. [28,29] The temperature of the molten steel required for slagging is reduced because the CaO powder melts and dephosphorization mainly occurs in the upward-floating process of the fire-spot zone. [18] The reduction in the required molten steel temperature and the increase in the slagging efficiency result in better thermodynamic conditions.…”

Method for Dynamic Prediction of Oxygen Demand in Steelmaking Process Based on BOF Technology

“…Oxygen is one of the most important energy sources in the BOF steelmaking process and plays an important role in the production rhythm and component temperature control [9,10]. Due to the function of different BOF modes, they have different oxygen demands.…”