期刊
ACTA GEOLOGICA SINICA-ENGLISH EDITION
卷 94, 期 3, 页码 861-876出版社
WILEY
DOI: 10.1111/1755-6724.14291
关键词
basalt-water-CO(2)interaction; carbon capture and storage; CO(2)mineralization; leachate chemistry; normalized mass loss; secondary silicates
资金
- Department of Science and Technology [IS-STAC/CO2-SR-79/10/G]
Investigating the immobilization of CO2, previous basalt-water-CO(2)interaction studies revealed the formation of carbonates over a short period, but with the extensive formation of secondary silicates (SS). The mechanisms involved in these processes remain unresolved, so the present study was undertaken to understand secondary mineral formation mechanisms. XRPD and Rietveld refinement data for neo-formed minerals show a drastic decrease in the Ca-O bond length, with the calcite structure degenerating after 80 h (hours). However, SEM images and EDS data revealed that a longer interaction time resulted in the formation of chlorite and smectite, adjacent to basalt grains which prevent basalt-water-CO(2)interaction to form carbonates, thus restricting carbonate formation. As a result of this, the CO(2)mineralization rate is initially high (till 80 h), but it later reduces drastically. It is evident that, for such temperature-controlled transformations, low temperature is conducive to minimizing SS surface coating at the time of mineral carbonation.
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