| 摘要 |
Continuous production of liquid steel or alloy is performed in a closed loop melt circulation system comprised of a reduction arm (1) and a post-combustion arm (2) with product molten metal being circulated by gas-lift pump (3) and siphon (4). Preheated reducing gas (12) is passed countercurrently to the melt with thermochemical energy requirements being transported by the metal from the post-combustion arm. Ore fines (5) are distributed onto the surface of the melt at (10) to form a thin layer of molten oxidic material, which is transported along whilst undergoing gaseous reduction. An overflow weir (7) and phase disengagement region (8) removes slag (9). Carbon and hydrogen containing gases are not permitted direct access to the metal, so decarburisation and desiliconisation are not required. If natural gas is the reductant, neither is desulphurisation necessary. Accordingly, excess refined liquid metal (11) can be withdrawn or overflown directly as product. |
