| 摘要 |
To remove phosphorus from iron to a desired level, a charge of the iron is melted in a vessel followed by either (i) supplying gas such as 40% CO2+9% CO+51% H2 to the charge before melting is complete, or (ii) adding, to the charge, iron which is partly or wholly oxidized equivalent to adding iron ore of up to 8% of the charge weight, or a combination of (i) and (ii), such as would at 1600 DEG C. supply an oxygen partial pressure of at least 10-10 atmospheres. Then, when the surface of the charge is substantially molten but before the surface of the charge reaches 1550 DEG C., either (a) slag is removed from the surface of the charge or (b) a refractory oxide compatible with the vessel lining is added sufficient to form a viscous slag or (c) (permissible only with a basic vessel lining) basic oxide(s) and optionally a flux are added to form a fluid slag.
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