Paper No. 5
Presentation Time: 9:00 AM-6:30 PM

A FUNDAMENTAL STUDY ON CO2 FIXATION BY MINERAL CARBONATION OF WASTE LIME


MIN, Kyoung-Won1, LEE, Hyun-Cheol1 and SEO, Eui-Young2, (1)Energy and Resources Engineering, Kangwon National University, 1 Kangwon daehak-gil, Chuncheon, Gangwon-do, 200-701, South Korea, (2)Energy and Resources Engineering, Kangwon National University, 1 Kangwon daehak-gil, Chuncheon, 200-701, South Korea, kwmin@kangwon.ac.kr

Mineral carbonation, one of the CO2 fixation methods, involves converting gaseous CO2 to a geologically stable solid by combining CO2 with CaO or MgO to form carbonate minerals such as calcite, vaterite, aragonite. In this study, waste lime was evaluated its potential applicability as a material for CO2 fixation. Tested waste lime mainly of calcite and bassanite is chemically composed of CaO, SO3, MgO, SiO2 and others in amounts of 43.6%, 24.8%, 20.8%, 3.58% and 7.11%, respectively. Laboratorial tests under various experimental conditions such as reaction time, stirring speed, CO2 injection rate, temperature, and etc. were carried out for fixation of gaseous CO2 by reaction with waste lime. The content of CO2 in waste lime after CO2 injection, identified by the TG-DTA test, was increased up to 30% in comparison with 18.4% of its original content before reaction. Experimental results showed that waste lime can be used as a potential material for CO2 fixation by mineral carbonation.