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Dephosphorization of Mn‐based alloys
Author(s) -
Ma Zhongting,
Ni Ruiming,
Zheng Chongjie,
Wang Jinshu
Publication year - 1992
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199200480
Subject(s) - oxidizing agent , manganese , slag (welding) , base (topology) , oxygen , refining (metallurgy) , chemistry , metallurgy , materials science , mathematics , organic chemistry , mathematical analysis
The critical oxygen partial potential of dephosphorization in liquid Mn‐base alloys under oxidizing or reducing conditions has been determined by thermodynamic analysis. Under oxidizing conditions, thermodynamic conditions to achieve dephosphorization and avoid manganese oxidizing were given. The results of thermodynamic analysis show that BaO‐base slag can be an effective dephosphorization agent for Mn‐base alloys. Under reducing conditions, the high degree of dephosphorization in Mn‐base alloys can be obtained based on thermodynamic analysis. In experimental work, BaCO 3 was added to remove phosphorus from Mn–Fe–C melts. The time needed for equilibration of the dephosphorization reaction of Mn–Fe–C melts was determined at 1573, 1623 and 1673 K. The refining results were experienced as dephosphorization efficiency ≠ p = (%[P] 0 − %[P])/%[P] 0 . Moreover, the effect of the initial content of Si and C on ≠ p was investigated. ≠ p in the Mn–Fe–C melts was also given as a function of temperature. Dephosphorization reaction in Mn–Fe–C melts is of first order.