Phosphorus Distribution Equilibrium between CaO-FeO*-SiO₂-P₂O₅(15%)-CaF₂(B₂O₃) Slag System and Carbon-Saturated Hot Metal at 1573K

Abstract:

In order to understand the equilibrium condition of phosphorus between slag and hot metal saturated with carbon in the high phosphorus hot metal dephosphorization process, the dephosphorization capacity of CaO-FeO*-SiO₂-P₂O₅(15%) -CaF₂(B₂O₃) slag system at 1573 K was studied, by applying the method that phosphorus distribution ratio between slag and solid iron was firstly measured and the one between slag and hot metal was then calculated. The results showed that phosphorus distribution ratio decreased with increase in basicity of CaO/(SiO₂ +P₂O₅), a proper increase in SiO₂ content is helpful to the absorption of phosphorus into slag, an increase in FeO* content from 10.52% to 13.40% resulted in a dramatic reduction of phosphorus distribution ratio from 126.43 to 33.25, by completely substituting CaF₂ with B₂O₃ at 2.5 of basicity and 0.07 of B₂O₃/CaO ratio not only was acquired a high phosphorus distribution ratio of 171, but also was decreased pollution to the environment.

• Periodical: Advanced Materials Research (Volume 402)
• Pages: 227-234
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.402.227
• Online since: November 2011
• Authors: Jin Dong Zhou, Xue Gong Bi, Zhi Cheng Huang, Zhi Jun Wen, Fu Yang, Yan Jin
• Keywords: Boron Oxide, Dephosphorization Capacity, Equilibrium Distribution Ratio, Hot Metal Pretreatment

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