Carbonation and utilization of basic oxygen furnace slag coupled with concentrated water from electrodeionization
Journal
Journal of CO2 Utilization
Journal Volume
25
Pages
46-55
Date Issued
2018
Author(s)
Abstract
In this study, the integrated recycle process of basic oxygen furnace slag (BOFS) coupled with concentrated water from electrodeionization (CW-EDI) which was introduced into the direct carbonation process for the first time was investigated. The effects of different operating parameters on carbonation conversions of BOFS were studied and the reaction kinetics were determined via surface coverage model. Meanwhile, the changes of CW-EDI during leaching and carbonation processes were measured. Furthermore, the performance evaluation of BOFS applied as supplementary cementitious materials (SCMs) and a cost and benefits analysis of the whole process was conducted. The results indicated the feasibility of the integrated system to industrial solid waste, sewage, and exhaust treatments and the maximum achievable carbonation conversion of BOFS was approximately 60.9% with R2 of 0.958-0.982. A high level of calcium ion and the alkaline solution hindered the leaching of calcium ion from BOFS, whereas sodium ion was absorbed by BOFS simultaneously. The properties of the cement that used BOFS as SCMs met ASTM requirements. The suggested substitution ratios for fresh and carbonated BOFS in cement mortars were 15% and 10%, respectively. The economic results revealed the superiority of the carbonation and utilization process over traditional treatments in CO2 emission reduction, cost saving and profit gaining. © 2018 Elsevier Ltd. All rights reserved.
SDGs
Other Subjects
Basic oxygen converters; Calcium; Cements; Chemicals removal (water treatment); Cost benefit analysis; Electrodes; Emission control; Furnaces; Gas emissions; Ions; Leaching; Metal ions; Oxygen; Reaction kinetics; Sewage; Slags; Basic oxygen furnace slag; Carbonation process; CO2 emission reduction; Electro-deionization; Industrial solid wastes; Operating parameters; Performance evaluations; Supplementary cementitious material; Carbonation
Type
journal article