Please use this identifier to cite or link to this item:
Title: Treatment of ladle furnace slag by carbonation: carbon dioxide sequestration, heavy metal immobilization, and strength enhancement
Authors: Xu, Bo
Yi, Yaolin
Keywords: Engineering::Civil engineering
Issue Date: 2022
Source: Xu, B. & Yi, Y. (2022). Treatment of ladle furnace slag by carbonation: carbon dioxide sequestration, heavy metal immobilization, and strength enhancement. Chemosphere, 287 Pt 3, 132274-.
Journal: Chemosphere
Abstract: Ladle furnace slag (LFS) is a by-product of the steel industry and is difficult to be reused due to its weak cementitious property, low strength, and potential leaching of heavy metals. The emission of carbon dioxide (CO2) is also a concern for the steel industry. Therefore, the aim of this study was to use CO2 to immobilize heavy metals in LFS and enhance its strength. The LFS specimens were carbonated with different initial water contents, CO2 pressures, and carbonation periods. The carbonated LFS were then studied by leaching test, unconfined compressive strength (UCS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), fourier transform infrared spectroscopy (FTIR), and field emission scanning electron microscopy (FESEM) with energy dispersive X-ray spectroscopy (EDX). The results showed that LFS had carbonation reactivity and could sequester CO2 up to 9.6% of its own mass. The carbonation also effectively reduced the leaching of heavy metals from LFS, especially Pb and Zn. The concentrations of leached Pb and Zn of carbonated LFS were significantly reduced from 2760 and 1460 μg/L to 0.11 and 0.56 μg/L, respectively, being one order of magnitude (Pb) or three orders of magnitude (Zn) lower than limits of inert waste and three drinking water regulations. The strength of the carbonated LFS also remarkably increased and was two orders of magnitude higher than that of the uncarbonated LFS. Following the carbonation, calcium carbonate, nesquehonite, and hydromagnesite were produced; these carbonates filled pores and bound LFS particles, which enhanced the strength of LFS.
ISSN: 0045-6535
DOI: 10.1016/j.chemosphere.2021.132274
Schools: School of Civil and Environmental Engineering 
Rights: © 2021 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

Citations 20

Updated on May 26, 2023

Web of ScienceTM
Citations 20

Updated on May 20, 2023

Page view(s)

Updated on May 29, 2023

Google ScholarTM




Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.