Abstract
Recently, many large-sized blast furnaces have been constructed also in Japan, whish capacities of pig iron are more than2, 000t per day, These blast furnaces are superior to those of foreign countries in not only iron productivity, but also coke consumption,
In this article, it is clarified that the capacity limit of a blast furnace is influenced by the properties of coke used, and the various conditions for the increase of iron productivity, the arrangement of works, the structures of large-sized blast furnaces, the charging equipments of raw matercals and the furnace operations are described in detail.
Lastly, the recent problems of heavy oil injection into blast furnaces have also been reviewed.
