Abstract
This paper describes the present status of coal utilization in ironmaking.The two main processes of coal injection into blast furnace have been developed to save expensive metallurgical coke;1) The colloidal fuel mixture injection2) The pulverized coal injection (PCI)The development of the former process, that is coal oil mixture (COM) and coal tar mixture (CTM) injection into blast furnace, was completed by Sumitomo Metal Industries and other Japanese steel works in 1982.As for the latter one, the first PCI equipment in Japan has been operated in Oita No.1 BF of Nippon Steel Corporation since 1981. It was successfully completed by modifing the ARMCO system. The number of blast furnace with PCI system operation has come up to sixteen in Japan, which implies remarkable development of the system.The present technology of coal utilization in iron and steel industry is focused on the development of both coal water mixture (CWM) injection into blast furnace and coal addition into steelmaking vessels.
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