CO 2 sequestration by carbonation of olivine: a new process for optimal separation of the solids produced

Green Processing and Synthesis

article

Laura Turri¹  Daniel Meyer²  Anaëlle Cloteaux³  Antoine Gérard³  Salvatore Bertucci⁴  Karine Gérardin¹  Hervé Muhr¹  François Lapicque¹  Alvaro Saravia²  Stéphanie Szenknect²  Adel Mesbah²  Régis Mastretta²  Nicolas Dacheux² 

[1] Laboratoire Réactions et Génie des Procédés, CNRS-Université de Lorraine;Institut de Chimie Séparative de Marcoule, CEA-CNRS-Université Montpellier;Progepi – Process Lab;ArcelorMittal Research Center

关键词: CO2 sequestration;    olivine;    products separation;    carbonation;    direct/indirect processes;   

DOI  :  10.1515/gps-2019-0016

来源: De Gruyter

【 摘 要 】

CO 2 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 CO 2 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 CO 2 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 m 2 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.

【 授权许可】

CC BY