Composition and structure of the mineral and combustion residues of high-ash coal

Resumo

Elemental composition and infrared spectra of mineral and cindery residuals of high-ash coal coming from a deposit of northern Kazakhstan is under consideration. New concepts about the structural transformations in mineral substance of coal during combustion are presented. The combustion, as shown, is leading to changes of elemental composition and distortions of symmetry of SiO₄-tetrahedrons, which form a basis of silicates.