Mould Flux

Name: Mould Flux
Diagram No.: 995
Type of diagram: CCT, TTT
Chemical composition in weight %: 70% (CaO and SiO2), 0–6% MgO, 2–6% Al2O3, 2–10% Na2O (+ K2O), 0–10% F with varying additions of TiO2, ZrO2, B2O3 Li2O, and MnO.
Group: Slags
Note: Continuous cooling curves compared with isothermal TTT curves [46].
Time-temperature-transformation (TTT) curves have been studied by several workers using double hotthermocouple and quenching techniques. T-T-T curves determine the amount of crystalline phase formed in a certain time and temperature. A typical example is shown in Figure where it can be seen that for the slag to attain 50% crystalline fraction at 800°C, it will take >300 s.
Rocabois et al.studied the theoretical background to crystallization and reported that although Tnose= 0.77 Tliq is the usually accepted relation for calculating the temperature of the ‘nose’ in the TFT curve, the constant for mould fluxes had values around 0.86 ± 0.06.
They also concluded that the calculated critical quenching rate (Rc = {Tnose- Tliq }/tnose where t = time) was useful for classifying crystallization for different compositions but did not provide a quantitative predictions of crystallization47. It has always been assumed that the initial solid layer was glassy and that subsequent annealing of this glassy layer would result in crystallization in the hotter regions (on the shell side) of the slag layer.
It has been reported that cuspidine (3CaO.2SiO2.CaF2) is formed in the primary crystallization and nepheline or carnegieite in the secondary phase.
Reference: Not shown in this demo version.

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