Abstract
The influence of hydrothermal pretreatment temperature on the hydration products and carbonation efficiency of Al-rich LF slag was investigated. The results showed that the carbonation efficiency was strongly dependent on the morphology of hydration products and the hydration extent of the raw slag. Hydrothermal pretreatment at 20 °C or 80 °C favored the formation of flake-shaped products with a higher specific surface area and therefore resulted in a higher CO2 uptake of 20 °C and 80 °C-pretreated slags (13.66 wt% and 10.82 wt%, respectively). However, hydrothermal pretreatment at 40 °C, 60 °C or 100 °C led to the rhombohedral-shaped calcite layer surrounding the unreacted core of the raw slag and the formation of fewer flake-shaped products, resulting in a lower CO2 uptake of 40 °C, 60 °C and 100 °C-pretreated slags (9.21 wt%, 9.83 wt%, and 6.84 wt%, respectively).
Highlights
The growth of global greenhouse gas emissions was 2.0% in 2018 and there is no sign that any of these emissions are peaking yet
Given that the morphology of the hydration product of C12A7 has a significant effect on the carbonation efficiency of ladle furnace refining slag (LF slag) and the type of hydration product produced is related to temperature, the aim of this study was to investigate the influence of hydrothermal pre-treatment temperature on the hydration properties and the carbonation efficiency of Al-rich LF slag at ambient temperature and pressure
This study investigated the temperature of hydrothermal pretreatment on the hydrate formation and carbonation efficiency of Al-rich LF slag at ambient temperature and pressure
Summary
The growth of global greenhouse gas emissions was 2.0% in 2018 and there is no sign that any of these emissions are peaking yet. CO2, either in gaseous or in aqueous phase [3] Alkaline solid wastes such as red mud, steel slag, blast furnace slag, fly ash, etc., are used for direct mineral carbonation as efficient and economically available capturers of CO2 [4,5,6,7,8,9]. In our previous study [11], the improvement in the direct carbonation efficiency of Al-rich ladle furnace refining slag (LF slag) by hydrothermal pretreatment was investigated. Given that the morphology of the hydration product of C12A7 has a significant effect on the carbonation efficiency of LF slag and the type of hydration product produced is related to temperature, the aim of this study was to investigate the influence of hydrothermal pre-treatment temperature on the hydration properties and the carbonation efficiency of Al-rich LF slag at ambient temperature and pressure. The relation between the morphology of the hydration product and the carbonation efficiency was clarified in this work
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