title: CO2 sequestration by mineral carbonation of steel slags under ambient temperature: parameters influence, and optimization.
abstract: This work focuses on the influence of different parameters on the efficiency of steel slag carbonation in slurry phase under ambient temperature. In the first part, a response surface methodology was used to identify the effect and the interactions of the gas pressure, liquid/solid (L/S) ratio, gas/liquid ratio (G/L), and reaction time on the CO2 removed/sample and to optimize the parameters. In the second part, the parameters' effect on the dissolution of CO2 and its conversion into carbonates were studied more in detail. The results show that the pressure and the G/L ratio have a positive effect on both the dissolution and the conversion of CO2. These results have been correlated with the higher CO2 mass introduced in the reactor. On the other hand, an important effect of the L/S ratio on the overall CO2 removal and more specifically on the carbonate precipitation has been identified. The best results were obtained L/S ratios of 4:1 and 10:1 with respectively 0.046 and 0.052 gCO2 carbonated/g sample. These yields were achieved after 10 min reaction, at ambient temperature, and 10.68 bar of total gas pressure following direct gas treatment.
authors.affiliation: INRS-ETE, 490 rue de la Couronne, Québec, QC, G1K 9A9, Canada.
authors.forename: Alia Ben
authors.initials: AB
authors.lastname: Ghacham
authors.affiliation: INRS-ETE, 490 rue de la Couronne, Québec, QC, G1K 9A9, Canada. louis-cesar.pasquier@ete.inrs.ca.
authors.forename: Louis-César
authors.initials: LC
authors.lastname: Pasquier
authors.affiliation: INRS-ETE, 490 rue de la Couronne, Québec, QC, G1K 9A9, Canada.
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Cecchi
authors.affiliation: INRS-ETE, 490 rue de la Couronne, Québec, QC, G1K 9A9, Canada.
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Blais
authors.affiliation: INRS-ETE, 490 rue de la Couronne, Québec, QC, G1K 9A9, Canada.
authors.forename: Guy
authors.initials: G
authors.lastname: Mercier
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D002254:Carbonates / Q000737:chemistry*; D008903:Minerals / Q000737:chemistry*; D013232:Steel / Q000737:chemistry*; D013696:Temperature
chemical_list: D002254:Carbonates; D008903:Minerals; D013232:Steel; D002245:Carbon Dioxide
keywords: Aqueous mineral carbonation; Parameters’ influence; Response surface methodology; Steel slag