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“ACEME”: Synthesis and characterization of reactive silica residues from two stage mineral carbonation Process
Author(s) -
Benhelal E.,
Rashid M.I.,
Rayson M.S.,
Oliver T.K.,
Brent G.,
Stockenhuber M.,
Kennedy E.M.
Publication year - 2018
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.13066
Subject(s) - carbonation , dissolution , silica fume , amorphous silica , portland cement , residue (chemistry) , solubility , cement , materials science , nuclear chemistry , nitric acid , pozzolan , extraction (chemistry) , chemical engineering , chemistry , mineralogy , metallurgy , organic chemistry , engineering
In this experimental work we synthesized, characterized, and investigated the reactivity of silica‐enriched residue materials produced from low pressure, low temperature dissolution applicable to a two stage mineral carbonation process. XRF and XRD analysis indicated that 66 wt % of silica‐enriched residue (SER) produced from dissolution of heat activated lizardite comprised amorphous silica. We also treated SER with nitric acid to produce amorphous acid treated silica‐enriched residue (ATSER) with over 88 wt % silica. Dissolving these synthesized materials in highly alkaline solution with pH similar to cement paste pore solution for 28 days showed that all synthesized materials displayed some level of Si solubility. ATSER showed the most rapid rate of Si extraction, higher than silica fume (a commercial pozzolanic cement substitute), followed by silica‐enriched residue (SER) which had a faster rate of Si extraction compared with Portland cement as a standard. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13066, 2019