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The distribution ratio of phosphorous between the CaO―CaF 2 (―SiO 2 ) flux and SiMn alloy melts at 1 823 K was measured under strongly reducing atmosphere. Furthermore, thermodynamic and kinetics analyses were carried out for the environmental stability of reducing refining slags containing Ca 3 P 2 under wet cooling conditions from the effect of slag composition on the evolution of PH 3 (phosphine) gas. The distribution ratio of phosphorous between the CaO―CaF 2 (―SiO 2 ) flux and SiMn metal phases increased with increasing CaO concentration in the flux, followed by a constant value. The composition for the saturating distribution ratio of phosphorous was in good accordance to the saturation content of CaO in the CaO― CaF 2 flux at 1 823 K. When the Vee ratio (= CaO/SiO 2 ) of the dephosphorization slag was greater than about 1.35, the lime and dicalcium silicate phases precipitated during solidification, resulting in an increase in the evolution rate of PH 3 gas under wet and dry conditions due to an increase in the reaction area. However, when the Vee ratio of the slag was lower than about 1.35, fluorite, cuspidine, and wollastonite phases precipitated from the phase diagram, resulting in less amount of PH 3 evolution during cooling because the reaction between Ca 3 P 2 and H 2 O was restricted to the surface of bulk slag.

Effect of Atmosphere and Slag Composition on the Evolution of PH3 Gas during Cooling of Reducing Dephosphorization Slags