Caracterização e classificação da Lama de Beneficiamento de Rochas Ornamentais (LBRO) de acordo com as etapas produtivas

Abstract

The State of Espírito Santo has a large number of companies that operate in the extraction and processing of dimension stones, and is currently the largest national producer, with an emphasis on the large share of revenues from Brazilian stone slab exports. These activities generate a significant volume of waste, among which, what draws the most attention is the dimension stone processing slurry (DSPS), from the phases of block sawing and plate polishing. Thus, the variation in the physical and chemical parameters of the DSPS depends on the technology used in the processing, the quality or type of component added to the process, in addition to the quantity, which varies considerably from one company to another. Compositional variations also occur depending on the type of processed rock, the stages of water reuse, among other factors. Having the classification and characterization of the LBRO is to provide necessary subsidies for the proper management of the sludge when it is discarded, both for companies and for environmental agencies. In this study, the objective is to characterize and classify the DSPS according to the processing steps (unfolding and polishing) from collections made in companies that have conventional and diamond wire looms, and polishing machines. Therefore, the information presented allowed to classify the DSPS samples and demonstrate that the metals tend to concentrate in the liquid phase of the sludge, and, in the solid phase, the concentrations are attenuated. This demonstrate the relevance of establishing a more detailed monitoring of the raw materials and inputs, which are the components for understanding the formation and composition of the DSPS and thus properly manage the processing of rocks and minimize the appearance of contaminants in the wastes generated