Carbon dioxide capture by waste material of reductive slag

• Main Authors: Ping-Tse Yu, 余秉澤
• Other Authors: Dyi-Hwa Tseng
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/89420463285890169525

碩士 === 國立中央大學 === 環境工程研究所 === 102 === The objectives of this study were to evaluate the carbonation efficiencies, reaction rate and mechanism for carbon dioxide capture by waste material of reductive slag. The experiments were carried out at gas-liquid phase system and gas-liquid-solid phase system under different operation parameters, respectively. The results of extraction tests indicated that the maximum 79.4% of calcium was extracted from slag at pH 4 and solid/liquid ratio of 50 g/L. Then, the optimum 67.6% carbonation efficiency was obtained at gas flow rate of 0.5 L/min and inflow CO2 concentration of 100% during the 60 min reaction time for gas-liquid phase system. In addition, the test results of gas-liquid-solid phase system revealed that the optimum calcium conversion was about 51.3% at the conditions of solid-liquid ratio was 30 g/L, gas flow rate was 1 L/min, and inflow CO2 concentration was 20% during the reaction time of 90 min. The result of simulation kinetic studies showed that the carbonation reaction occurred in gas-liquid-solid phase system was well fitted to the surface coverage model. Also, the reaction rate constant of carbonation was increased with the increase of gas flow rate and CO2 concentration, and with the decrease of solid-liquid ratio, respectively.