Passive Mineral Carbonation of Mg-rich Mine Wastes by Atmospheric CO2
| Autor: | John Molson, Xavier Maldague, El Hadji Babacar Kandji, Jean-Michel Lemieux, Richard Fortier, Ali Nowamooz, Marc Constantin, Ali Entezari, Antoine Gras, Gnouyaro P. Assima, Akué-Sylvette Awoh, Faïçal Larachi, Micha Horswill, Sara Turcotte, Christian Dupuis, Georges Beaudoin, Josée Duchesne, Bruno Bussière, René Therrien, Benoît Plante, K. Lechat |
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| Rok vydání: | 2017 |
| Předmět: |
Exothermic reaction
Mineral Waste management Brucite Carbonation Carbonate minerals 010501 environmental sciences engineering.material 010502 geochemistry & geophysics 01 natural sciences Tailings Permeability (earth sciences) engineering General Earth and Planetary Sciences Environmental science Dissolution 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Energy Procedia. 114:6083-6086 |
| ISSN: | 1876-6102 |
| DOI: | 10.1016/j.egypro.2017.03.1745 |
| Popis: | Mg-rich process tailings and waste rocks from mining operations can react spontaneously with atmospheric CO 2 to form stable carbonate minerals by exothermic reactions. Over the last decade, we have conducted a number of laboratory and field experiments and surveys on both mine waste rocks and different types of mine tailings from Ni-Cu, chrysotile, and diamond mines. The experiments and surveys cover a wide range of time (10 3 to 10 8 s) and mass (1-10 8 g) scales. Mine waste rich in brucite or chrysotile enhances the mineral carbonation reactions. Water saturation, but more importantly, watering frequency, are highly important to optimize carbonation. Adjusting the chemical composition of the interstitial water to favour Mg dissolution and to prevent passivation of the reaction surfaces is crucial to ensure the progress of the carbonation reactions. Preservation of the permeability structure is also critical to facilitate water and CO 2 migration in the rock wastes and tailings. In field experiments, CO 2 supply controled by diffusion in the mining waste is slower than the reaction rate which limits the capture of atmospheric CO 2 . Industrial implementation of passive mineral carbonation of mine waste by atmospheric CO 2 can be optimized using the above parameters. |
| Databáze: | OpenAIRE |
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