Abstract
Blast furnace slag (BFS), a calcium-rich industrial byproduct, has been utilized since 2005 as a mineral carbonation feedstock for CO2 sequestration, producing calcium carbonate precipitates. In this study, the conditions for the dissolution of Ca and Si in acetic acid, and subsequent carbonation, were elaborated. For this purpose, the retardation of the polymerization of silicon was attempted by varying the concentration of acetic acid, temperature, and leaching time. An inductively coupled plasma (ICP) analysis revealed that both the Ca and Si dissolved completely within 30 min in 5% acetic acid at room temperature. This high dissolution value can be attributed to the fact that Ca was bound to O rather than to Si, as determined by X-ray photoelectron spectroscopy (XPS). The use of CO2-absorbed monoethanolamine enabled the complete carbonation of BFS at ambient conditions without the need for a pH swing. The presence of dissolved silica was found to affect the polymorphs of the precipitated CaCO3. We believe that this process offers a simple method for manipulating the composites of products obtained by mineral carbonation diminishing the leaching residues.
Highlights
Slag is the general term for the non-metallic product resulting from the separation of a metal from its raw ore
The presence of dissolved silica was found to affect the polymorphs of the precipitated CaCO3. We believe that this process offers a simple method for manipulating the composites of products obtained by mineral carbonation diminishing the leaching residues
Blast furnace slag (BFS) is one of the steelmaking slags produced at high temperatures by the blast furnace route, in which a flux is injected to separate the iron from silicates or other impurities in the primary materials
Summary
Slag is the general term for the non-metallic product resulting from the separation of a metal from its raw ore. Blast furnace slag (BFS) is one of the steelmaking slags produced at high temperatures by the blast furnace route, in which a flux (limestone or dolomite) is injected to separate the iron from silicates or other impurities in the primary materials. Ground BFS is generally recycled as a cementitious material for use in blended Portland cements [2]. Instead of this recycling method, the recovery of certain components from the slag has attracted the attention of industry with the goal of utilizing this industrial waste. The recycled components have been restricted to silica and alumina [1], but calcium has recently gained attention as another valuable element to be used in mineral carbonation [3]
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