Carbonation of Electric Arc Furnace Slag for Cement Replacement

• Main Authors: Chieh-Li Chen, 陳劼立
• Other Authors: Pen-Chi Chiang
• Format: Others
• Language: en_US
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/72825895120581982691

碩士 === 國立臺灣大學 === 環境工程學研究所 === 103 === In this study, an integrated process of waste-to-resource technology was developed. Carbon dioxide (CO2) sequestration using the accelerated carbonation of electric arc furnace (EAF) slag under various operational conditions in a high-gravity rotating packed bed (RPB) was investigated. Moreover, wastewater neutralization and product utilization were investigated as well. The performance of CO2 capture by EAFS were evaluated under various levels of reaction time, reaction temperature, rotational speed and liquid-to-solid ratio. The samples of reacted slurry were analyzed quantitatively and qualitatively by using thermogravimetric analysis (TGA) and X-ray diffraction (XRD), respectively. Furthermore, the morphology and microstructure of samples were also examined using scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX). Furthermore, utilization of electric arc furnace (EAF) slag as cement replacing materials for Portland cement has been examined. Both fresh and carbonated EAF slag were blended in the cement with the percentages of 5, 10, 15 and 20% replacements of Ordinary Portland Cement (OPC) were tested for compressive strength. According to ATSM C109 regulation, the cement mortars were tested at 3, 7 and 28 days of curing age with the 50 mm x 50 mm x50 mm molds. The physico-chemical characteristics and structure of the hardened cement mortars were studied. In addition, the performance of EAF slag as a filler in the OPC-EAF slag mortars was examined.