The paper deals with the characteristics of synthesized glass-ceramics
obtained by sintering a mixture of final flotation waste (FFW) with tuff at
1260?C for 7 h, followed by the annealing of pressed samples at 1080oC for
36 h. The experiments were done in order to find the possibility for the
valorization of waste material (FFW). By thermal treatment of mixtures of
T20 (20 % tuff, 80 % FFW) and T40 (40 % tuff, 60 % FFW) to a temperature of
1260oC over a period of 7 hours, is obtained glass-ceramics with dendritic
structure. The synthesized glass-ceramics consists of two phases: iron oxide
crystals (maghemite, magnetite, and hematite) and glass with an approximate
ratio of phases 32/68 (T20) and 23/77 (T40), respectively. The relatively
small shrinkage of the synthesized material (up to 7 %) enables reliable
control when designing a given shape indicating that such glass-ceramics can
be used as a basis for obtaining construction material. The synthesis of
pressed samples of mixtures (T20 and T40) at 1080oC for 36 h produces
glass-ceramics that have a high coefficient of sound attenuation, which
indicates good acoustic insulating properties.