The ladle slag formed in ladle metallurgy (II. Metallurgy) has transportation and storage problems and it leads to environmental pollution by creating 30 million tons of waste annually in the world. Transforming this slag into a product that does not cause environmental problems would play an important role in the solution of this problem. This study has been carried out to increase the density of ladle slag which occurs in ladle metallurgy and to improve slag by converting it into a transportable by-produ1 studies were carried out in the Gebze Dilovasi facilities of Diler Iron and Steel Plant which has a production capacity of 1.300.000 tons/year of low and medium carbon steel. A transportable and denser slag has been obtained by adding colemanite in different ratios to the ladle slag, which was originally occurred in the form of [gama-dicalcium silicate gamma-Ca2(SiO4)] during cooling phase, and it is converted to [beta- dicalcium silicate beta-Ca2(SiO4)] form during the cooling. The chemical analyses, density measurements, physical analysis about slag surface appearance, chemical composition in compact points and product phase transformation analyses of the obtained slags were conducted by means of XRD and SEM/EDS devices. According to results of this study, a compact ladle slag structure was occurred by addition of colemanite and the starting ratio of B203/Slag (kg/kg) was 1%, the bulk density of the obtained slag was increased from 1.36 to 2.64 tons/m3, and a maximum 9 ppm B was industrially determined within the steel body.
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