Comparação dos produtos de moagem para produção de membrana porosa composto de vidro temperado reutilizado

Abstract

The present work aims at comparing the influence of different types of grinding for the fragmentation of borosilicate glass bottles and containers that have been discarded in laboratories and their use in the production of porous membranes for microfiltration, produced by filling sintering. Two types of grinding are compared: the conventional ball mill and the SPEX type high energy mill. The main difference from conventional to high energy mill is that the vibratory mill works in both circular and three-dimensional motions simultaneously, as well as acting at high frequency and impact velocity, providing a smaller particle size than the conventional mill. Glass fragments were obtained from the glassware for disposal, stored in UTFPR and processed in mills with a milling power of 2: 1 for 14 hours. In a proportion of 20% by mass of the glass, the agent responsible for the non-sintering phase, sodium chloride (NaCl), was added, being compacted in three pressures 108 MPa, 123 MPa and 139 MPa. The results are based on membrane characterization by field emission scanning electron microscope (SEM-FEG), water absorption, porosity and density. The membranes produced by the material fragmented by the high energy mill presented this low absorption index, presented a mirroring in their surfaces, appearing vitrification in their structures. As the particle size used in this membrane was smaller, the reduction of the particle size, the larger the surface area of the particle. Consequently the study shows that there was a reduction in the sintering temperature of the membranes produced by the post processed in the high energy mill. Among the pressures used, the pressure of 123 Mpa presented the highest values of density, both for the material fragmented by the SPEX mill and for the conventional mill. However, with increasing densification, the porosity and absorption parameters are inversely proportional, due to densification in the closure of sample pores. It is concluded that the process of producing membranes using tempered glass from laboratory disposal using the SPEX high-energy mill is a cost-effective alternative for the production of a material with numerous applications.