Study for vitreous waste recovery in the formulation of heavy clay ceramics

摘要

The study was to analyze the technical feasibility of the incorporation of vitreous waste, from enamel decanters, into a heavy clay mass for fired clay ceramic structural block production. The analyzed waste is considered as class I–Dangerous due to the presence of toxic elements in the leachate above the Brazilian waste classification standard. Six formulations made the standard mass and others with different percentages (2, 5, 10, 15 and 20%) of the added waste. Chemical and mineralogical characterization tests of the raw materials carried out. The technological properties evaluated were linear thermal retraction of drying and firing, loss on fire, water absorption and mechanical resistance. The results presented in the formulations demonstrated the feasibility of using up to 20% by weight in standard mass. Where it was possible to decrease the water absorption and increase the mechanical strength. This work also contributes to the reduction of the environmental impact and favors the sustainable development of the heavy clay ceramics contributing to the improvement of the quality of the pieces.