Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Mineral carbonation (5)
- Blast furnace slag (2)
- Precipitated calcium carbonate (2)
- AOD slag (1)
- Acetic acid (1)
-
- Aragonite polymorph (1)
- Bacteria (1)
- Bioleaching (1)
- Calcium succinate (1)
- Chemoorganotrophic (1)
- Compressive strength (1)
- Fungi (1)
- Hydrothermal conversion (1)
- Leaching (1)
- Leaching additive (1)
- Magnesium chloride (1)
- Microstructure (1)
- Mineralogy analysis (1)
- Nickel (1)
- Olivine (1)
- Succinic acid (1)
- Ultrasonic treatment (1)
- Ultrasoundintensification (1)
- Valorization (1)
- Zeolitic materials (1)
Articles 1 - 6 of 6
Full-Text Articles in Engineering
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 …
Chemoorganotrophic Bioleaching Of Olivine For Nickel Recovery, Yi Wai Chiang, Rafael M. Santos, Aldo Van Audenaerde, Annick Monballiu, Tom Van Gerven, Boudewijn Meesschaert
Chemoorganotrophic Bioleaching Of Olivine For Nickel Recovery, Yi Wai Chiang, Rafael M. Santos, Aldo Van Audenaerde, Annick Monballiu, Tom Van Gerven, Boudewijn Meesschaert
Faculty Publications and Scholarship
Bioleaching of olivine, a natural nickel-containing magnesium-iron-silicate, was conducted by applying chemoorganotrophic bacteria and fungi. The tested fungus, Aspergillus niger, leached substantially more nickel from olivine than the tested bacterium, Paenibacillus mucilaginosus. Aspergillus niger also outperformed two other fungal species: Humicola grisae and Penicillium chrysogenum. Contrary to traditional acid leaching, the microorganisms leached nickel preferentially over magnesium and iron. An average selectivity factor of 2.2 was achieved for nickel compared to iron. The impact of ultrasonic conditioning on bioleaching was also tested, and it was found to substantially increase nickel extraction by A. niger. This is credited to an enhancement …
Effect Of Accelerated Carbonation On Aod Stainless Steel Slag For Its Valorisation As A Co2-Sequestering Construction Material, Muhammad Salman, Özlem Cizer, Yiannis Pontikes, Rafael M. Santos, Ruben Snellings, Lucie Vandewalle, Bart Blanpain, Koen Van Balen
Effect Of Accelerated Carbonation On Aod Stainless Steel Slag For Its Valorisation As A Co2-Sequestering Construction Material, Muhammad Salman, Özlem Cizer, Yiannis Pontikes, Rafael M. Santos, Ruben Snellings, Lucie Vandewalle, Bart Blanpain, Koen Van Balen
Faculty Publications and Scholarship
Non-stabilized Argon Oxygen Decarburisation (AODNS) slag in powdered form was examined for its carbon dioxide sequestration capacity and for its potential utilization in the fabrication of high value building materials. The curing of the sample was carried out in two accelerated carbonation environments: i) in a carbonation chamber, maintained at atmospheric pressure, 22 °C, 5 vol.% CO2 and 80% RH; and ii) in a carbonation reactor, where the CO2 partial pressure (pCO2) and temperature could be further increased. In the carbonation chamber, an average compressive strength of over 20 MPa, on a 64 cm …
Magnesium Chloride As A Leaching And Aragonite-Promoting Self-Regenerative Additive For The Mineral Carbonation Of Calcium-Rich Materials, Rafael M. Santos, Marius Bodor, Paul N. Dragomir, Andreea G. Vraciu, Maria Vlad, Tom Van Gerven
Magnesium Chloride As A Leaching And Aragonite-Promoting Self-Regenerative Additive For The Mineral Carbonation Of Calcium-Rich Materials, Rafael M. Santos, Marius Bodor, Paul N. Dragomir, Andreea G. Vraciu, Maria Vlad, Tom Van Gerven
Faculty Publications and Scholarship
Two approaches for the intensification of the mineral carbonation reaction are combined and studied in this work, namely: (i) the calcium leaching and aragonite promoting effects of magnesium chloride (MgCl2), and (ii) the passivating layer abrasion effect of sonication. The alkaline materials subjected to leaching and carbonation tests included lime, wollastonite, steel slags, and air pollution control (APC) residue. Batch leaching tests were conducted with varying concentrations of additives to determine extraction efficiency, and with varying solids-to-liquid ratios to determine solubility limitations. Aqueous mineral carbonation tests, with and without the use of ultrasound, were conducted applying varying concentrations of magnesium …
Impacts Of Nickel Nanoparticles On Mineral Carbonation, Marius Bodor, Rafael M. Santos, Yi Wai Chiang, Maria Vlad, Tom Van Gerven
Impacts Of Nickel Nanoparticles On Mineral Carbonation, Marius Bodor, Rafael M. Santos, Yi Wai Chiang, Maria Vlad, Tom Van Gerven
Faculty Publications and Scholarship
This work presents experimental results regarding the use of pure nickel nanoparticles (NiNP) as a mineral carbonation additive. The aim was to confirm if the catalytic effect of NiNP, which has been reported to increase the dissolution of CO2 and the dissociation of carbonic acid in water, is capable of accelerating mineral carbonation processes. The impacts of NiNP on the CO2 mineralization by four alkaline materials (pure CaO and MgO, and AOD and CC steelmaking slags), on the product mineralogy, on the particle size distribution, and on the morphology of resulting materials were investigated. NiNP-containing solution was found to reach …