Processing and Reusing Technologies for Steelmaking Slag

About 40 million tons of steel slag a year, which is the by-product of iron and steel manufacture, is generated in Japan and the almost all the slag is reused for the materials, e.g. cement raw material, road base course material and civil engineering material, by effectively utilizing its characteristics such as chemical components and mechanical properties. Most of its purposes of uses are to replace the functions of the newly mined raw materials from nature and promoting the use of steel slag is an effort to contribute to environmental conservation in this regard. On the other hand, due to the changes in social situation, supply-demand structure in the steel slag market is changing and Nippon Steel Corporation is developing the technologies to create new features of steel slag and to utilize them, especially in the field of Basic Oxigen Furnace (BOF) slag. In this report, the current production and sales status, processing and reusing technologies of BOF steelmaking slag are mentioned. Table 1 Production and sales of steel slag (2010Fy)