CaO-SiO2-TiO2-Na2O-Al2O3 Slag

Name: CaO-SiO2-TiO2-Na2O-Al2O3 Slag
Diagram No.: 1138
Type of diagram: TTT
Chemical composition in weight %: See the table
Group: Slag
Note: TTT diagrams for slags in the CaO-SiO2-TiO2-Na2O-Al2O3 system obtained from SHTT and for a F-bearing industrial slag [5] (continuous line also obtained from SHTT). TTT diagrams: For the CSTNA slags the samples were maintained at 1600 C for 60 seconds after heating at a rate of 1000 C/min. At this high temperature, the samples are completely melted within a few seconds. It was clearly observed that if the same sample is used to do many determinations at the same temperature the incubation times became longer. The reason for this effect is Na2O loss at high temperatures, assuming that the higher the %Na2O content the higher the crystallisation tendency. To avoid this problem the maximum number of measurements per sample was ten. The slag CSTNA_1 was designed to have basicity and TiO2 content similar to the slag CST_2; see Table 5. The TTT diagrams for the slags CST_2 and CSTNA_1 are in Figure 34, in logarithmic scale. The Na2O-bearing slag CSTNA_1 has higher crystallisation rate. Na2O addition shortens intensely the incubation times from the CaO-SiO2-TiO2 slag system.
With this new finding i.e. the fact that there is a great increase of the crystallisation rate when adding Na2O in the CaO-SiO2-TiO2 system, other slags were produced with a lower Na2O content to study the possibility of controlling the crystallisation. From CSTNA_1 were produced CSTNA_2 and CSTNA_3, maintaining basicity and TiO2 content in similar levels. As expected shorter incubation times were observed, especially to CSTNA_3 which has lower Na2O content. Industrial mould slags contain Al2O3 and because of this fact CSTNA_4 was also produced, which is a slag with composition similar to CSTNA_1 but containing more Al2O3. Despite of having a higher Al2O3 content the incubation times are similar, except at lower temperatures where there is some difference.
Additional links: No. 1135, No. 1136, No. 1137, No. 1139, No. 1140
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