Laboratory Investigation of the High Phosphorus Hot Metal Dephosphorization Pretreatment Using Multi Phase Flux

Abstract:

The difficult problems in dephosphorization pretreatment of the high phosphorous hot metal are extremely high flux consumption and very large temperature drop. Dephosphorization with multi phase flux would be helpful to solve these difficulties. In this paper, 2CaO·SiO₂ was used as the solid phase and the effect of slag composition and solid/slag mass ratio on dephosphorization efficiency of the high phosphorus hot metal was investigated in the laboratory. Dephosphorization capacity of nine multi phase fluxes was determined by means of equilibrium experiment and it is revealed that dephosphorization capacity of the multi phase fluxes is controlled by the slag composition when solid/slag mass ratio is within 0.30; as solid/slag mass ratio exceeds 0.30, dephosphorization capacity of the multi phase fluxes increases with increasing the ratio. Pretreatment experiments of Fe-0.5%P-0.15%Si-4.5%C were conducted with multi phase flux at 1400 °C (1673.15 K). The test results show that replacement of slag with 2CaO.SiO₂ particles on mass ratio of 50:50 brings about smaller finale [%P], suggesting dephosphorization of the high phosphorus hot metal with multi phase flux is beneficial to the reduction of flux consumption. Moreover, the experimentally determined equilibrium MgO concentration in the multi phase fluxes decreases with increasing solid/slag mass ratio when the ratio exceeds 0.30, implying dephosphorization with multi phase fluxes of higher solid/slag mass ratios is beneficial to the control of reactor linings corrosion.

• Periodical: Advanced Materials Research (Volumes 785-786)
• Pages: 31-37
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.785-786.31
• Online since: September 2013
• Authors: Jin Dong Zhou, Xue Gong Bi, Fu Yang
• Keywords: Dicalcium Silicate, High Phosphorus Hot Metal, Multi Phase Dephosphorization Flux

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