| 摘要 |
<p>Basic steel is made from low iron acid ores by an acid smelting process followed by treatment of the metal in a hot blast cupola operating under reducing conditions with more fuel than that required for melting and an acid slag containing more basic constituents than normal acid slag, the iron being superheated to 1500-1600 DEG C. and of low sulphur and silicon contents, the metal being finally blown in a basic converter. The basic lined cupola may be charged with liquid iron from the blast furnace or from a mixer and solid scrap may be added as part of the charge. The whole of the charge may be granulated and the fuel may be a low grade fuel. Alloying elements, e.g. manganese or phosphorus may be added in the cupola as ores, oxides or slags. The base/acid ratio of the slag may be 0.8 to 1.</p> |
