Silicate glasses obtained from fine silica powder modified with galvanic waste addition

This work presents a study of waste incorporation in silicate glass process based on the formulations of soda-lime glass compositions using two different industrial solid residues. Glass silicates were produced from the residue of silica powders retained in the filter sleeves of sanitary ceramic factories. An other waste also used as the starting material was the solid galvanic residue from metallurgical processes. Besides part of the silica contents was replaced by boron oxide to improve melting of the glasses and the behavior of both the formulations was analyzed. The temperatures for the fusion were selected based on the equilibria diagrams and the flux characteristics of the melting as a function of the glass compositions. Temperatures up to 1500 °C and annealing treatments were used. The composition and the structure of the glass specimens were studied using X-ray fluorescence and X-ray diffraction methods. The resistances of the glasses at environmental conditions by hydrolysis, acid and alkaline attack experiments were analyzed. Glasses with up to 40 wt% of added galvanic solid waste and 28 wt% of fine silica powder with a good chemical resistance were obtained.