Phosphorous Partition between 2CaO SiO2 Particles and CaO-SiO2-FetO Slags

Mass Transfer of P2O5 between Liquid Slag and Solid Solution of 2CaO·SiO2 and 3CaO·P2O5

“…Measurements of the equilibrium distribution ratio of P 2 O 5 between the solid solution and the liquid phase of the slag have revealed that P 2 O 5 is concentrated in the solid solution with a high distribution ratio. 2,3) Ito et al measured the distribution ratio of P 2 O 5 for the CaO-SiO 2 -P 2 O 5 -FeO and CaO-SiO 2 -P 2 O 5 -Fe 2 O 3 systems. 2) They clarified that the measured distribution ratio, expressed by equation (1), is proportional to the T · Fe content in the liquid phase and that this relation remains unchanged, irrespective of the type of iron oxide, i.e., FeO where the subscripts SS and L denote solid solution and liquid phase, respectively.…”

“…Inoue et al have measured the mass transfer rate under this mechanism. 3) In their experiment, the C 2 S particles, which were stabilized by B 2 O 3 , were mixed with the C 2 S-saturated molten slag containing 1 to 5 % P 2 O 5 . Initial size of C 2 S particles was 20-50 mm, and the experimental temperature was changed from 1 573 to 1 833 K. It was clarified that the mass transfer rate by this mechanism was very high and that the distribution ratio of P 2 O 5 reached equilibrium in less than 10 s.…”

Phosphorous Partition in Dephosphorization Slag Occurring with Crystallization at Initial Stage of Solidification

“…Several investigations have been carried out to clarify the reaction of solid CaO in a molten slag. [1][2][3][4][5][6][7][8] The process of dissolving CaO is quite complicated because the melting point changes in accordance with the CaO content. When the melting point increases, some crystal-phase precipitation occurs.…”

Magnetic Separation of Phosphorus Enriched Phase from Multiphase Dephosphorization Slag

“…There have been an increasing number of reports on solid-liquid phosphorus distribution, 6,7) phase equilibrium, 8) thermodynamic properties, 9) and solid-liquid reaction mechanisms 10) in the multi-phase flux. However, dephosphorization slag is a complex system involving many solid solutions with many aspects still to be elucidated.…”