CARACTERIZAÇÃO TECNOLÓGICA DE METAPIROXENITO DA FORMAÇÃO CÓRREGO DOS BOIADEIROS, NOVA LIMA (MG), BRASIL

• Published in: Holos (Natal, RN) Vol. 37; no. 6; pp. 1 - 16
• Main Authors: Ferreira, B T, Santos, M M, Lima, R M F, Brito, H, Carmiganano, O R D R
• Format: Journal Article
• Language: English
• Published: Natal Instituto Federal de Educacao Ciencia e Tecnologia do Rio Grande do Norte 01.01.2021
• Subjects: Chromite; Dispersion; Ilmenite; Laboratories; Magnetic separation; Manufacturing; Metallizing; Microscopy; Mineralogy; Minerals; Optical microscopes; Optical microscopy; Raw materials; Software; Talc; Thermogravimetric analysis; Thermogravimetry; Tremolite; X ray analysis; Brazil
• ISSN: 1518-1634; 1807-1600
• DOI: 10.15628/holos.2021.9732

In the mineralogical characterization by X-ray diffraction, optical microscopy, SEM / EDS and thermogravimetry, the following minerals were identified: antigorite, chlorite, chromite, ilmenite, magnetite, rutile, talc and tremolite. For this reason, in this research, studies of technological characterization of this rock, aiming at the establishment of routes in talc purification for its application in other industrial segments of greater added value have been accomplished. 2 MATERIALS AND METHODS 2.1Materials For this study, metapyroxenite blocks of approximately 20cm X 40cm dimension were collected at several places in the quarry, Pedras Congonhas Extraçao Arte Industria Ltda., located in the municipality of Nova Lima - MG, about 20 km from the BR-040 highway. The remaining -147 |am material was size classified by a sieve of 74 |am aperture in order to produce the following fraction sizes: -147+74 ^m and -74^m that were used in magnetic separation tests, aiming to concentrate the talc. 2.2Methods 2.2.1 Mineralogical and Chemical Characterization of the Metapyroxenite Sample 2.2.1.1 Optical microscopy and scanning electron microscopy with dispersive X-ray analysis system For rock textural studies and identification of translucent mineral phases were performed by the analysis of polished thin sections, observed in transmitted light, using the Leica optical microscope, model DMLP. For the identification of the opaque minerals and confirmation of the minerals identified in transmitted light microscopy, the polished thin sections were metallized with a carbon film and analyzed by scanning electron microscope with an X-ray dispersive analysis system (JEOL Model JSM-6010LA, manufactured by the Analytical Scanning Electron Microscope), operating with a working distance of 10 mm and a voltage of 20 kV. 2.2.1.2X-ray diffraction and thermogravimetric analysis The identification of the main mineralogical phases was performed by the X-ray diffractometry - XRD (total powder method).