In present paper there are presented such correlations for the silica-alkali systems (M2O – SiO2)
where reliable thermodynamic data exists from the thermal equilibrium diagrams. It was observed
that with the saturation of SiO2 tetrahedron with metal ions, the difference in basicity between the
reactants is diminished, in the order SiO2 → disilicate → metasilicate → orthosilicate, and that
confirms the role of driving force for these reactions of the acid-base interaction between oxides
and the intermediate silicates formed. Also, there were proposed some correlations between the
standard formation Gibbs free energy, (Gº298), and basicity percentage, pB, for the binary
compounds from the same oxide systems.
Considering the fact that for a system at equilibrium, reaction constant Kp depends on the
reaction free Gibbs energy (rG0
298) and temperature, a correlation between basicity difference
through basicity percentage, pB, and rG0
298 is proposed.
The paper follows both the national preservation and durable managing policy, as well as
the European laws for the area of environmental protection (UE’s Directive 1999/31/EC – „landfill
of waste” an the Council’s Directive no. 94/62/CE regarding the packaging and the packaging
waste, amended by the Council’s Directive no. 2004/12/CE). The proposed technologies lead to
reducing the need of both raw materials and energy in the process of obtaining various types of
glass. The study proposes new ways of retrieving and eliminating waste that contains heavy metals
alongside borosilicate shards. This paper also aims to increase the responsibility of the waste
generating companies and to make the potential users more sensible.
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