Abstract
In integrated steel plants, the removal of phosphorous normally takes place during the primary basic oxygen furnace (BOF) steelmaking process. Phosphorous is usually introduced to the integrated steelmaking process through blast furnace additions, such as iron ore, coke, sinter, and fluxes. Among the others parameters such as optimizing the charging system, oxygen supply system, oxygen lance parameters of the converter, the flux quality in combination with temperature process control can improve the BOF efficiency of Dephosphorization. Phosphorus partition ratio (LP) is usually used to evaluate the thermodynamic efficiency of the dephosphorization of slags with different compositions in steelmaking processes. However, this parameter is only useful in equilibrium conditions, and it is not accurate when used to evaluate slag efficiency in industrial processes. Because of this, the aim of this work was to study the phosphorus partition ratio estimated from the experimental results in real plant conditions of two different BOF steel plants and compare them with well-known published models. In the present study, data from two steel plants (further Plant A and Plant B) were evaluated applying Healy’s, Suito and Inoui’s, Zhang’s as well as Assis’s equations. The calculated values were compared against measured values.
Highlights
A long time ago, phosphorus was recognized as a deleterious trace element in steel, which must be strictly controlled
Phosphorous is primarily introduced to the integrated steelmaking process through blast furnace additions, such as iron ore, coke, sinter, and fluxes [1,2,3]
The removal of phosphorus from the furnace charge is a well understood process. It can be described by the DePhos coefficient LP = (%P2O5)/[%P], which represents the distribution between slag – (%P2O5), and metal – [%P]
Summary
A long time ago, phosphorus was recognized as a deleterious trace element in steel, which must be strictly controlled. Reducing phosphorus content in the steel is one of the critical factors to enhance the steel properties. In recent times, lowering phosphorus content has become a critical requirement for steels used in thin sheets for deep drawn applications, automobile exteriors, pipelines for transporting natural gas and petroleum products, or heavy plates for shipbuilding. Phosphorous is primarily introduced to the integrated steelmaking process through blast furnace additions, such as iron ore, coke, sinter, and fluxes [1,2,3]. Raw material selection is crucial in maintaining the desired phosphorous level in the final product [4]. Effect of phosphorus on the properties of steels
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