Development of glass-ceramic material using waste foundry sand and limestone

Reference Presenter Authors
(Institution)
Abstract
06-121 Silvio Rainho Teixeira Magalhães, R.d.(Universidade Estadual Paulista); Teixeira, S.R.(Universidade Estadual Paulista); Santos, L.F.(Universidade Estadual Paulista); Santos, G.T.(Universidade Estadual Paulista); Souza, A.E.(Universidade Estadual Paulista); Leme, T.S.(Universidade Estadual Paulista); The waste foundry sand (WFS) is one of the largest industrial solid waste volume generated by the foundries in the production of cast iron and steel parts. It has a high concentration of silicon dioxide and other elements important minority, who favor the use of waste for the production of glass-ceramic materials. Limestone is an abundant, low-cost mineral, calcium carbonate as major role and magnesium carbonate and silicon dioxide in smaller concentrations. In this paper a new composition of this waste was evaluated for glass-ceramics production, the base of calcium silicates. Sands were analyzed from different foundries companies dropped, with varied concentrations of SiO2, and limestone. To determine the composition of the glass-ceramic material used the ternary phase diagram of the system SiO2-CaO-Al2O3. The WFS and limestone were mixed with fondant, in different combinations, were merged and cooled in water, to obtain the glass (melting and cooling method). The glasses were milled and submitted to thermal differential analysis (TDA), for the determination of the glass transition temperature and crystallization. Powdered glass samples were crystallized, for formation of the ceramic material, in temperatures determined by TDA. The WFS, the limestone, glass and glass-ceramics were characterized using x-ray diffractometry (XRD). Were determined water absorption, porosity, and apparent density of glass-ceramic.
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