Composição química e mineralógica de diferentes frações granulométricas dos finos de beneficiamento de rochas ornamentais

Chemical and mineralogical composition of different particle size fractions of fines from dimension stone processing

Abstract

The processing for dimension stone production generates a residue called Fines from Dimension Stone Processing – FIDSP. This material is considered a potential raw material for manufacturing "ecoproducts", motivating detailed studies of its composition. The aim of this work was to analyze the chemical and mineralogical characteristics of different particle size fractions of the FIDSP. Samples were analyzed for particle size fractions, chemical and mineralogical composition, the last two carried out after particle fractionation. Results show that the fraction passing the 0,053 mm aperture sieve had a relevant increasing in the loss on fire and in Ca an K contents, in addition to decrease in concentrations of Mg, Na, and Fe. Synthetic diamonds that can be reused were preserved in coarser fractions and it is necessary to control the entry of dirt that could worsen the quality of the FIDSP, if it is used as raw material.