The recycling of scrap has attracted more attention in recent years, and scrap can be used as iron-bearing material to smelt hot metal. The smelting practice of blast furnace (BF) with scrap addition in China was investigated, with the types of scrap being small pieces of scrap, such as crushed materials, light and thin materials, and small compacts which were easy to be added into BFs. The higher productivity of BFs with scrap addition was observed compared with that of BFs without scrap addition at the same volume, and the positive correlation between production increase rate and addition amount of scrap was found. The reducing agent rate of most BFs with scrap addition was lower than the average reducing agent rate at the same volume, while the gas utilization of BFs with scrap addition would not be reduced significantly. The theoretical analysis of cost saving was carried out as well, and the results indicated that the cost could be saved by scrap addition. The melting and carburizing were the two main processes of scrap in BF, in which three steps were involved in the melting process of scrap. The amount of carburization depended on the carbon content of hot metal in hearth and the original carbon content in scrap. The calculation showed that the coke rate could be reduced by 27 kg with 100 kg scrap addition per ton of hot metal, and the saving cost was decided by the amount of scrap and the actual situation of BF.

废钢的回收利用近年来引起了越来越多的关注，并且废钢可以用作含铁材料来熔炼铁水。研究了我国高炉加废的冶炼实践，废的类型为小碎屑，如碎料，轻薄料，易于压实的小粉粒。在相同体积下，与不添加废料的高炉相比，添加废料的高炉的生产率更高，并且发现生产率的提高与废料的添加量呈正相关。在相同体积下，大多数添加废渣的高炉还原剂率均低于平均还原剂率，而添加废屑的高炉煤气的利用率不会显着降低。进行了成本节约的理论分析，结果表明通过添加废料可以节省成本。高炉废钢的熔化和渗碳是废钢的两个主要过程，其中三个步骤涉及废钢的熔化过程。渗碳量取决于炉床中铁水的碳含量和废料中的原始碳含量。计算表明，每吨铁水加入100千克废铁可将焦炭率降低27千克，而节约成本则取决于废铁量和高炉的实际情况。其中三个步骤涉及废料的熔化过程。渗碳量取决于炉床中铁水的碳含量和废料中的原始碳含量。计算表明，每吨铁水加入100千克废铁可将焦炭率降低27千克，而节约成本则取决于废铁量和高炉的实际情况。其中三个步骤涉及废料的熔化过程。渗碳量取决于炉床中铁水的碳含量和废料中的原始碳含量。计算表明，每吨铁水加入100千克废铁可将焦炭率降低27千克，而节约成本则取决于废铁量和高炉的实际情况。