| 摘要 |
<p>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% C0<Sub>2</Sub> + 9% CO + 51% H<Sub>2</Sub> to the charge before melting is complete, or (ii) adding, to the charge, iron which is partly or wholly oxidised 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°C supply an oxygen partial pressure of at least 10<Sup>-10</Sup> atmospheres. Then, when the surface of the charge is substantially molten but before the surface of the charge reaches 1550°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.</p> |
