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Distinguishing Between Carbonate And Non-Carbonate Precipitates From The Carbonation Of Calcium-Containing Organic Acid Leachates, Rafael M. Santos, Yi Wai Chiang, Jan Elsen, Tom Van Gerven
Distinguishing Between Carbonate And Non-Carbonate Precipitates From The Carbonation Of Calcium-Containing Organic Acid Leachates, Rafael M. Santos, Yi Wai Chiang, Jan Elsen, Tom Van Gerven
Faculty Publications and Scholarship
Two organic acids were trialled for the extraction of calcium from steelmaking blast furnace slag for the purpose of precipitated calcium carbonate (PCC) production: succinic and acetic acids. While the leaching performance of succinic acid was superior, carbonation of its leachate did not result in the production of PCC, but rather the precipitation of calcium succinate, and only after the use of pH buffering agents (sodium hydroxide or bicarbonate). In contrast, carbonation of the acetic acid leachate resulted in the production of PCC, also with the aid of buffering agents. This discrepancy highlights the need for a combination of chemical, …
Towards Zero-Waste Mineral Carbon Sequestration Via Two-Way Valorization Of Ironmaking Slag, Yi Wai Chiang, Rafael M. Santos, Jan Elsen, Boudewijn Meesschaert, Johan A. Martens, Tom Van Gerven
Towards Zero-Waste Mineral Carbon Sequestration Via Two-Way Valorization Of Ironmaking Slag, Yi Wai Chiang, Rafael M. Santos, Jan Elsen, Boudewijn Meesschaert, Johan A. Martens, Tom Van Gerven
Faculty Publications and Scholarship
A three-stage process was developed to transform blast furnace slag (BFS) into two valuable products: precipitated calcium carbonate (PCC) and zeolitic materials. The conceptualized process aims to simultaneously achieve sustainable CO2 sequestration and solid waste elimination. Calcium is first selectively extracted by leaching with an organic acid, followed by carbonation of the leachate to precipitate CaCO3. In parallel, the hydrothermal conversion of the extracted solid residues in alkali solution induces the dissolution/precipitation mechanism that leads to the formation of micro- and meso-porous zeolitic materials. Leaching selectivity was identified as a key factor in the valorization potential of both products. Acetic …