CO2 sequestration by mineral carbonation of steel slags under ambient temperature: parameters influence, and optimization
2016
Ghacham, Alia Ben | Pasquier, Louis-César | Cecchi, Emmanuelle | Blais, Jean-François | Mercier, Guy
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.
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