Carbon Capture and Utilization as Cement Replacement Using Electric Arc Furnace Slag (EAFS) in a High-gravity Carbonation (HiGCarb) Process
Date Issued
2016
Date
2016
Author(s)
Chung, Tai-Chun
Abstract
In this study, CO2 capture experiments were conducted by accelerated carbonation in a rotating packed bed (RPB). EAF slag was selected as feedstock in this research due to its high calcium content and high CO2 capture capacity. In term of sustainability, the carbonated EAFS can be regarded as not a waste but a resource. On the other hand, many studies have been conducted on the use of slags as supplementary cementitious materials. The predicted optimal conversion which was determined by response surface methodology was 83.7% is corresponding to a capacity of 0.382 kg CO2 per kg EAFS. In the cement replacement experiments, the results reveal that the HiGCarb process appears to accelerate the hydration of the silicates to form a C–S–H-like gel and calcite which can enhance the performance of blended cement with EAF Slag. It has a particular influence of cement replaced by fresh EAFS on the setting time. The strength of cement replaced by carbonated EAFS was higher than the cement replaced by fresh EAFS in all curing age. The performance of blended cement with different kind of supplementary cementitious materials (EAFS、BOFS、FA) was also compared in this study. In addition, the concept of new generation HiGCarb process was proposed. To construct a complete production chain, the automatic control system should be established.
Subjects
Carbon Capture
Electric Arc Furnace Slag
High-gravity Carbonation Process
Cement Replacement
SDGs
Type
thesis
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