Effect of
Impurities on the Decarbonization of Calcium
Carbonate Using Aqueous Sodium Hydroxide
Posted on 2022-08-26 - 21:29
Decarbonizing calcium carbonate (CaCO3) is
a crucial
step for a wide range of major industrial processes and materials,
including Portland cement (PC) production. Apart from the carbon footprint
linked to fuel combustion, the process CO2 embodied within
CaCO3 represents the main concern for the sustainability
of production. Our recent works demonstrated that it is possible to
avoid both the fuel and process CO2 by reacting CaCO3 with aqueous NaOH and obtain Ca(OH)2 and Na2CO3·xH2O (x = 0 and 1). This present study provides a further understanding
of the process by testing different raw calcareous sources. A high
decarbonization (∼80%) of CaCO3 was achieved for
silica-rich chalk, whereas a lower extent was obtained (∼50%)
for limestone. To understand the difference in their reaction behavior,
the effect of impurities was studied. The effects of the major impurities
(Si, Al, and Fe) were found to be marginal, which is advantageous
to process industrial grade materials, while the morphology of the
raw materials presents a significant impact. The applicability of
our decarbonization technology was also demonstrated on magnesite
(MgCO3).
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Simoni, Marco; Hanein, Theodore; Woo, Chun Long; Provis, John; Kinoshita, Hajime (2022). Effect of
Impurities on the Decarbonization of Calcium
Carbonate Using Aqueous Sodium Hydroxide. ACS Publications. Collection. https://doi.org/10.1021/acssuschemeng.2c02913
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AUTHORS (5)
MS
Marco Simoni
TH
Theodore Hanein
CW
Chun Long Woo
JP
John Provis
HK
Hajime Kinoshita
KEYWORDS
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