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http://dx.doi.org/10.9727/jmsk.2015.28.1.39

The Effect of Chloride Additives and pH on Direct Aqueous Carbonation of Cement Paste  

Lee, Jinhyun (Department of Geological Sciences, Pusan National University)
Hwang, Jinyeon (Department of Geological Sciences, Pusan National University)
Lee, Hyomin (Department of Geological Sciences, Pusan National University)
Son, Byeongseo (Department of Geological Sciences, Pusan National University)
Oh, Jiho (Department of Geological Sciences, Pusan National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.28, no.1, 2015 , pp. 39-49 More about this Journal
Abstract
Recently, carbon capture and storage (CCS) techniques have been globally studied. This study was conducted to use waste cement powder as an efficient raw material of mineral carbonation for $CO_2$ sequestration. Direct aqueous carbonation experiment was conducted with injecting pure $CO_2$ gas (99.9%) to a reactor containing $200m{\ell}$ reacting solution and the pulverized cement paste (W:C = 6:4) having particle size less than 0.15 mm. The effects of two additives (NaCl, $MgCl_2$) in carbonation were analyzed. The characteristics of carbonate minerals and carbonation process according to the type of additives and pH change were carefully evaluated. pH of reacting solution was gradually decreased with injecting $CO_2$ gas. $Ca^{2+}$ ion concentration in $MgCl_2$ containing solution was continuously decreased. In none $MgCl_2$ solution, however, $Ca^{2+}$ ion concentration was increased again as pH decreased. This is probably due to the dissolution of newly formed carbonate mineral in low pH solution. XRD analysis indicates that calcite is dominant carbonate mineral in none $MgCl_2$ solution whereas aragonite is dominant in $MgCl_2$ containing solution. Unstable vaterite formed in early stage of experiment was transformed to well crystallized calcite with decreasing pH in the absence of $MgCl_2$ additives. In the presence of $MgCl_2$ additives, the content of aragonite was increased with decreasing pH whereas the content of calite was decreased.
Keywords
$CO_2$ sequestration; mineral carbonation; cement paste; carbonate mineral; pH;
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Times Cited By KSCI : 1  (Citation Analysis)
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