Phosphorus equilibrium between BaO-BaF2-MnO fluxes and ferro-manganese melts |
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Authors: | Xiaoya Liu Olle Wijk Roger Selin John Olof Edstrm |
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Affiliation: | Xiaoya Liu,Olle Wijk,Roger Selin,John Olof Edström |
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Abstract: | The equilibrium distribution ratio of phosphorus between BaO-BaF2-MnO slags and Mn(62–73%)-Fe-Csat-P melts has been determined for different slag compositions, oxygen partial pressures and at 1573–1673 K. The results showed that with a certain content of BaO in the slags, the phosphorus distribution ratio increased with increasing oxygen partial pressure up to about 10?17 atm. A high oxygen partial pressure resulted in a substantial oxidation of manganese from metal to slag. The phosphate capacity of BaO-BaF2-MnO slags increased with the BaO content and decreased with the MnO content in the investigated slag composition range. A high temperature resulted in a low phosphorus distribution ratio. For a BaO(50%)-BaF2(47%)-MnO(3%) slag, the effect of temperature on the phosphate capacity in the range of 1573–1673 K could be expressed as: (1) The heat of reaction: (2) was estimated to be ?1107 kJ/mole. |
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