Studies on Dephosphorisation of Steel in Induction Furnace

Abstract

Steel melters who use recycled steel scrap in small induction furnaces have no control on phosphorus input from scrap. For furnaces of capacity less than 2T, dephosphorisation in external ladle is not possible owing to excessive heat loss. Studies on dephosphorisation were thus carried out in the induction furnace itself using lime based fluxes with and without addition of fluxing agents like CaF 2 and Na20. The fluxes were added directly and also added through injection. The effects of individual components of fluxes on dephosphorisation were estimated. Correlation were developed between dephosphorisation and different expressions of basicity values. An operator can easily use these correlation to predict dephosphorisation levels depending on type of flux used and mode of addition.

Effect of Fluorine on the Minerals Phase and Citric Acid Solubility of CaO&ndash;SiO₂&ndash;Fe_<i>t</i>O&ndash;P₂O₅&ndash;CaF₂ System

“…[4][5][6] Sen indicated that CaF 2 was the twice as effective as CaO for dephosphorization of steel in an induction furnace by using CaO-FeO-SiO 2 -CaF 2 slag. 7) Kitamura et al indicated that the higher CaF 2 /(CaOϩCaF 2 ) concentration ratio in flux were effective for the dephosphorization without the oxidization of chromium in chromium containing hot metal pretreatment. 8) Monaghan et al reported that CaF 2 had a positive effect on the reaction kinetics, and can increase the mass transfer coefficient of phosphorous in the slag.…”

MOOC Instruction Optimization in “Emergency and First Aid”—From the Perspective of the Knowledge Graph

“…The co-word analysis method combines the quantitative analysis with the qualitative analysis to reveal the core concepts and key contents and their relationships by counting the number of professional terms that are common to the curriculum. In order to prevent the division of professional vocabulary, we have all the chapters of the course subtitles in the psychological terms of artificial sorting to form a custom vocabulary [3]. In order to facilitate the keyword co-word analysis, we merge some of the same meaning of the key words and standardize the contents of the text according to the standard.…”