BF Slag

Name: BF Slag
Diagram No.: 975
Type of diagram: TTT
Chemical composition in weight %: 42.99% CaO, 33.52% SiO2, 13.77% Al2O3, 6.28% MgO, 0.37% FeO, <0.02% P2O5.
Group: Slags
Note: TTT diagram of blast furnace slag obtained by Kashiwaya et al. [3].
Figure depicts the TTT (time–temperature-transformation) diagram of BF slag measured by Kashiwaya et al.) It was observed that two kind of crystals, Gehlenite (2CaO·Al2O3·SiO2) and Merwinite (3CaO ·MgO·2SiO2), precipitate in BF slag. The nose of the TTT diagram depicted in Fig. occurs at 1100°C and 4 s, which corresponds to the area of Merwinite, whereas the area of Gehlenite is covered by the area of Merwinite. In Fig., the glassy area is expressed until 0.001 s. When the multi-nozzle rotary cylinder was operated at 3 000 rpm with a 1.3-mm diameter nozzle, the slag spouted from the nozzle consisted of a string shape that quickly separated in particles. During this fabrication process, if a slag particle hit the wall of the container, its shape was not spherical. In a previous paper, it was observed that the temperature of slag particles decreased from 1 450 to 800°C within 0.0085 s, which is not hot enough to deform the slag sphere.
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