Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
ACID DISSOLUTION STUDIES USING BRAZILIAN SERPENTINITE ROCKS APPLIED MINERAL CARBONATION
Submission Author:
Kely Vieira , SP
Co-Authors:
Kely Vieira, Gretta Larisa Aurora Arce Ferrufino, Ivonete Ávila, Carlos Manuel Romero Luna, João Carvalho, Turibio Soares Neto
Presenter: Kely Vieira
doi://10.26678/ABCM.ENCIT2016.CIT2016-0400
Abstract
Indirect Mineral carbonation through pH-swing is an attractive option for Carbon Capture technology (CCS). This technology can to fix the CO2 emission into carbonates. Thus, indirect mineral carbonation through pH-swing considers two stage, such as, extraction stage and carbonation stage. The extraction stage involves acid dissolution process of the silicate rocks, such as, serpentinite, in order to extract magnesium (Mg) contains into the rocks. The main aim of this study was investigate the uses of the brazilian serpentinite rocks in indirect mineral carbonation. For this, was used two serpentinite rocks. One serpentinite rock from Goiás state (S-GO) and the other from Minas Gerais state (S-MG). This samples were undergoes to different characterization tests. For extraction stage was used a Design of experiment (DoE) by Taguchi method, this DoE uses an L9 orthogonal matrix, in order to, evaluate four factors and its levels, such as, temperature process (T°C), HCl concentracion (M), particle size (µm) and HCl excess (E). The choice of these factors and levels is based on their influences in the dissolution process. The results shown that experimental tests using: particle size of 69 µm, temperature of 70°C, 2 M HCl, and four times the stoichiometric amount resulted in the highest Mg extraction for S-GO and S-MG. However, the Mg extracted for S-GO was more efficient that for S-MG, so, 76 % and 29 % of Mg extracted were obtained for S-GO and S-MG, respectively. The low efficiency on Mg extracted from S-MG was probably to the chemical composition, once that, S-MG contains 30 percent more of silicon oxide (SiO2) than S-GO. The statistical analysis shown the main factor on dissolution process is the temperature. The worth mentioned that the acid excess was the factor less significant.
Keywords
Carbon dioxide capture, Serpentinite rocks, Indirect mineral carbonation, Acid dissolution, Extraction efficiency, Carbon dioxide capture, Serpentinite rocks, Indirect mineral carbonation, Acid dissolution, Extraction efficiency, Carbon dioxide capture, Serpentinite rocks, Indirect mineral carbonation, Acid dissolution, Extraction efficiency, Carbon dioxide capture, Serpentinite rocks, Indirect mineral carbonation, Acid dissolution, Extraction efficiency
