Abstract

TANG, K.; JAKOBSSON, L.K.  and  HILDAL, K.. Thermodynamic evaluation of Sr-containing Si metals and silicate melts for Si-Sr alloy production. J. S. Afr. Inst. Min. Metall. [online]. 2018, vol.118, n.6, pp.601-605. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2018/v118n6a7.

Reliable thermodynamic descriptions of the Si-based Sr-Al-Ca-Fe-Mg metal system and SiO₂-SrO-CaO-MgO-Al₂O₃ oxide system are essential for the understanding and optimizing the production of Si-Sr alloys. Phase relations of all SrO containing binary and ternary subsystems were evaluated and thermodynamically modelled based on the existing literature data. Phase equilibria in the SiO2-SrO-CaO-MgO-Al2O3 higher-order oxide system were thus possible to calculate by the CALPHAD method. A thermodynamic description of the Si-Sr-Al-Ca-Fe-Mg metal system was developed based on assessment of all binary systems as well as all Si containing ternary subsystems. The newly developed thermochemical databases can be used to calculate the equilibrium distribution of Sr between metal and slag. The theoretical Sr distribution maps for both pure Si and 75FeSi alloys in different SrO-containing slags are reported.

Keywords : thermodynamic evaluation; Si-Sr-Al-Ca-Fe-Mg metal; SiO2-SrO-CaO-MgO-Al2O3 oxide; Sr equilibrium distribution.

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