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黑色金属再生资源——废钢铁是社会的产物,同时也是能源的结晶。它在国民经济中的地位和作用是不容忽视的。一、废钢铁是炼钢和铸造生产的重要原料废钢铁和生铁是炼钢和铸造生产的主要炉料。废钢铁与生铁相比,金属含量高4～5％,含碳量低3～4％,硫、磷等杂质少。因此,用废钢铁代替生铁炼钢,耗用的熔剂较少,冶炼时间较短,耗能少,成本低,金属收得率高,而且排出的钢渣少,对环境的污染较轻。本世纪初,废钢铁主要作为平炉炼钢的原料,通常与生铁或热铁水配合使用,废钢配比为30～50％。60
Black metal renewable resources - scrap steel is a product of society, but also the crystallization of energy. Its status and role in the national economy can not be ignored. First, scrap steel is an important raw material for steelmaking and foundry scrap and pig iron are the main charge for steelmaking and foundry production. Compared with pig iron scrap metal, high metal content of 4 to 5%, low carbon content of 3 to 4%, sulfur, phosphorus and other impurities less. Therefore, the use of scrap steel instead of pig iron steelmaking, less flux consumption, smelting time is shorter, less energy consumption, low cost, high metal recovery rate, and the discharge of steel slag less pollution to the environment lighter. At the beginning of this century, scrap steel was mainly used as a raw material for open hearth steelmaking. It was usually used in combination with pig iron or hot metal with a scrap ratio of 30-50%. 60