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CO2 sequestration by carbonation of olivine: a new process for optimal separation of the solids produced

Authors :
Turri Laura
Gérardin Karine
Muhr Hervé
Lapicque François
Saravia Alvaro
Szenknect Stéphanie
Mesbah Adel
Mastretta Régis
Dacheux Nicolas
Meyer Daniel
Cloteaux Anaëlle
Gérard Antoine
Bertucci Salvatore
Source :
Green Processing and Synthesis, Vol 8, Iss 1, Pp 480-487 (2019)
Publication Year :
2019
Publisher :
De Gruyter, 2019.

Abstract

CO2 sequestration by reaction with abundant, reactive minerals such as olivine has often been considered. The most straightforward, direct process consists in performing the reaction at high temperature and CO2 pressure, in view to producing silica, magnesium and iron carbonates and recovering the traces of nickel and chromite contained in the feedstock mineral. Most of direct processes were found to have an overall cost far larger than the CO2 removal tax, because of incomplete carbonation and insufficient properties of the reaction products. Similar conclusions could be drawn in a previous investigation with a tubular autoclave. An indirect process has been designed for high conversion of olivine and the production of separate, profitable products e.g. silica, carbonates, nickel salts, so that the overall process could be economically viable: the various steps of the process are described in the paper. Olivine particles (120 μm) can be converted at 81% with a low excess of acid within 3 h at 95°C. The silica quantitatively recovered exhibits a BET area over 400 m2 g-1, allowing valuable applications to be considered. Besides, the low contents of nickel cations could be separated from the magnesium-rich solution by ion exchange with a very high selectivity.

Details

Language :
English
ISSN :
21919550
Volume :
8
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Green Processing and Synthesis
Publication Type :
Academic Journal
Accession number :
edsdoj.fb3b09e17da649098d4cbeca3c4c1819
Document Type :
article
Full Text :
https://doi.org/10.1515/gps-2019-0016