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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Influence of physicochemical properties of Brazilian serpentinites on the leaching process for indirect CO2 mineral carbonation

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Author(s):
Arce, Gretta L. A. F. ; Neto, Turibio G. S. ; Avila, I. ; Luna, Carlos M. R. ; dos Santos, Jose C. ; Carvalho, Jr., Joao A.
Total Authors: 6
Document type: Journal article
Source: HYDROMETALLURGY; v. 169, p. 142-151, MAY 2017.
Web of Science Citations: 10
Abstract

pH-swing mineral carbonation is kinetically favorable and requires a short reaction time. It must also obtain a high extraction rate for reactive elements in the leaching process. The main purpose of this study is to investigate the behavior of different serpentinite rocks in the leaching processes; the reactivity of Brazilian serpentinite rocks (such as: S-GO and S-MG) is analyzed based on physicochemical properties in order to understand their relationship to leaching efficiency. Surface area-to-volume ratio (S-BET/V-p) and metals-to-silicon ratio (Sigma(Mg, Ca)/Si) were used to measure reactivity. Leaching was carried out to determine Mg and Fe extraction. Reaction conditions for both serpentinite rocks were: 355-250 pm particle size, 4 M HCI concentration, 100 degrees C, and 2 h of reaction time. Characterization results show that both serpentinite rocks (S-GO and S-MG) have high magnesium (Mg) content S-BET/V-p was 36 for S-GO and 29 for S-MG, while Sigma(Mg, Ca)/Si was 2.64 for S-GO and 120 for S-MG. These results suggest that S-GO is approximately 50% more reactive than S-MG, and that S-MG is limited by low accessible surface (S-BET/V-p) and the high mineralogical complexity (Sigma(Mg, Ca)/Si). Leaching results confirmed the reactivity; Mg and Fe extraction from S-GO was 94 +/- 1%. However, results for S-MG were 34% for Mg and 60% for Fe. In order to increase the reactivity of S-MG, particle size was reduced to 75-63 mu m. Even though S-MG was mechanically activated, Mg and Fe extraction has not increased significantly. (C) 2017 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 11/19920-7 - Carbon dioxide capture by carbonation process
Grantee:João Andrade de Carvalho Junior
Support Opportunities: Regular Research Grants
FAPESP's process: 13/21244-5 - EXPERIMENTAL ESTUDY OF CO2 MINERAL SEQUESTRATION BY pH-SWING PROCESS
Grantee:Gretta Larisa Aurora Arce Ferrufino
Support Opportunities: Scholarships in Brazil - Post-Doctoral