| Autor: |
Assunção ARS; Federal Institute of Education, Science and Technology of Maranhão, Av. Getúlio Vargas-04, Monte Castelo, São Luís 65025-001, Brazil., Correia GS; Federal Institute of Education, Science and Technology of Maranhão, Av. Getúlio Vargas-04, Monte Castelo, São Luís 65025-001, Brazil., Vasconcelos NDSLS; Federal Institute of Education, Science and Technology of Maranhão, Av. Getúlio Vargas-04, Monte Castelo, São Luís 65025-001, Brazil., Cabral AA; Federal Institute of Education, Science and Technology of Maranhão, Av. Getúlio Vargas-04, Monte Castelo, São Luís 65025-001, Brazil., Angélica RS; Graduate Program in Geology and Geochemistry, Institute of Geosciences, Federal University of Pará, Av. Augusto Correa-01, Guamá, Belém 66075-110, Brazil., da Costa FP; Graduate Program in Materials Science and Engineering (PPG-CEMat), Federal University of Campina Grande, Av. Aprígio Veloso-882, Bodocongó, Campina Grande 58429-900, Brazil., Menezes RR; Graduate Program in Materials Science and Engineering (PPG-CEMat), Federal University of Campina Grande, Av. Aprígio Veloso-882, Bodocongó, Campina Grande 58429-900, Brazil., de Araújo Neves G; Graduate Program in Materials Science and Engineering (PPG-CEMat), Federal University of Campina Grande, Av. Aprígio Veloso-882, Bodocongó, Campina Grande 58429-900, Brazil., Rodrigues AM; Graduate Program in Materials Science and Engineering (PPG-CEMat), Federal University of Campina Grande, Av. Aprígio Veloso-882, Bodocongó, Campina Grande 58429-900, Brazil., Rivas-Mercury JM; Federal Institute of Education, Science and Technology of Maranhão, Av. Getúlio Vargas-04, Monte Castelo, São Luís 65025-001, Brazil. |
| Abstrakt: |
Mineralogical and technological characterization of ceramic raw materials from a new deposit located at Caxias city, Maranhão State-Brazil, was accomplished to determine their potential as raw materials for the ceramics industry in northeastern Brazil. The ceramic raw materials were collected from three different locations on the site and characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), differential thermal analysis (DTA), and thermogravimetry (TG). The XRF analysis of the fraction < 2 μm revealed that most samples had SiO 2 (35-51 wt%), Al 2 O 3 (19-29 wt%), Fe 2 O 3 (2-21 wt%), MgO (0.7 to 4.5 wt%) and K 2 O (0.9 to 5 wt%) as components. Quartz, kaolinite, illite, hematite and montmorillonite were the main mineral phases identified. DTA and TG analysis confirmed the mineral identification. The technological potential of the ceramic raw materials was investigated by: cation exchange capacity (CEC), plastic behavior (Atterberg Limits), linear shrinkage at 950 °C (LS F ), flexural strength (FS), apparent porosity (AP), water absorption (WA) and bulk density (BD). The main experimental results-WA (9-17%), AP (19-31%), FS (2.0-23 MPa), and the Atterberg limits-indicated that the ceramic raw materials investigated have high potential to be used to develop mass for red or structured ceramics, such as bricks and roof tiles. |
