| 摘要 |
<p>PURPOSE:To make a scrap ratio in raw material to increase markedly and to decrease the cost of raw materials for steel making using converter which provides top-blowing lance having nozzles used for blowing granular carbon materials, oxygen gas and slag forming agents. CONSTITUTION:On refining steel by means of converter, the production cost of steel can be decreased by lowering the ratio of expensive molten steel used and by increasing that of inexpensive steel scrap. To this end, refining is conducted by charging both steel scrap and molten steel into the converter 1, followed by top-blowing using lanch providing nozzles a1, a2 and a3, subsequently pulverised carbon and other carbonaceous raw materials are blown to develop decomposed H2 and CO gas into converter. With this gasification heat, raw materials in the furnace are heated, furthermore heat quantity is increased owing to the development of heat on secondary combustion of H2 and CO, which permits the amount of scrap to increase markedly, resulting in reduced cost of steel making.</p> |
