Reaction between CO2 and CaO under dry grinding

Muhd Nor, Nik Hisyamudin and Yokoyama, Seiji and Kawakami, Masahiro and Umemoto, Minoru (2009) Reaction between CO2 and CaO under dry grinding. Powder Technology, 196 (2). pp. 156-162. ISSN 0032-5910

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Official URL: http://dx.doi.org/10.1016/j.powtec.2009.07.014

Abstract

This study was carried out to investigate the reaction between CO2 and materials that contain CaO under dry grinding. Chemical reagent CaO was used in this experiment, and waste concrete was also tested to examine the feasibility of CO2 sorption into it. Samples were ground in a CO2 atmosphere by a centrifugal ball mill. The reaction was measured with the constant volume method. The effects of amount of sample, the number and diameter of balls, the concentration of CO2 in the mixture of CO2 and air and the rotational speed on the CO2 sorption were examined. The amount of the CO2 sorption under grinding was larger than that without grinding. The grinding enhanced the reaction between CaO and CO2. The CO2 sorption steeply increased with time in the early stage of grinding. After that, it increased gradually. The CO2 reacted with the CaO at the surface layer of the newly exposed surface of the CaO particles during the grinding. The initial sorption rate of CO2 was related with the shear force. In the latter stage of grinding, the grinding process caused the CaO particles to agglomerate. As a result, the sorption of CO2 became slow. It was found that the waste concrete had high potential for sorption of CO2 by means of dry grinding. Behavior of reaction between CO2 and materials that contain CaO was studied. The CO2 sorption occurred on the new surface area of CaO that was exposed by the grinding process. The amount of CO2 linearly increased as the newly exposed surface area increased. Waste concrete was also found to be possible to absorb CO2 under dry grinding. Display Omitted

Item Type:Article
Subjects:T Technology > TN Mining engineering. Metallurgy
Divisions:Faculty of Mechanical and Manufacturing Engineering > Department of Materials Engineering and Design
ID Code:3814
Deposited By:Normajihan Abd. Rahman
Deposited On:07 Aug 2017 17:43
Last Modified:07 Aug 2017 17:43

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