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Carbon dioxide sequestration using NaHSO.sub.4 and NaOH: A dissolution and carbonation optimisation study
The use of NaHSO.sub.4 to leach out Mg fromlizardite-rich serpentinite (in form of MgSO.sub.4) and the carbonation of CO.sub.2 (captured in form of Na.sub.2CO.sub.3 using NaOH) to form MgCO.sub.3 and Na.sub.2SO.sub.4 was investigated. Unlike ammonium sulphate, sodium sulphate can be separated via precipitation during the recycling step avoiding energy intensive evaporation process required in NH.sub.4-based processes. To determine the effectiveness of the NaHSO.sub.4/NaOH process when applied to lizardite, the optimisation of the dissolution and carbonation steps were performed using a UK lizardite-rich serpentine. Temperature, solid/liquid ratio, particle size, concentration and molar ratio were evaluated. An optimal dissolution efficiency of 69.6% was achieved over 3 h at 100 [degrees]C using 1.4 M sodium bisulphate and 50 g/l serpentine with particle size 75-150 [mu]m. An optimal carbonation efficiency of 95.4% was achieved over 30 min at 90 [degrees]C and 1:1 magnesium:sodium carbonate molar ratio using non-synthesised solution. The CO.sub.2 sequestration capacity was 223.6 g carbon dioxide/kg serpentine (66.4% in terms of Mg bonded to hydromagnesite), which is comparable with those obtained using ammonium based processes. Therefore, lizardite-rich serpentinites represent a valuable resource for the NaHSO.sub.4/NaOH based pH swing mineralisation process.
Carbon dioxide sequestration using NaHSO.sub.4 and NaOH: A dissolution and carbonation optimisation study
The use of NaHSO.sub.4 to leach out Mg fromlizardite-rich serpentinite (in form of MgSO.sub.4) and the carbonation of CO.sub.2 (captured in form of Na.sub.2CO.sub.3 using NaOH) to form MgCO.sub.3 and Na.sub.2SO.sub.4 was investigated. Unlike ammonium sulphate, sodium sulphate can be separated via precipitation during the recycling step avoiding energy intensive evaporation process required in NH.sub.4-based processes. To determine the effectiveness of the NaHSO.sub.4/NaOH process when applied to lizardite, the optimisation of the dissolution and carbonation steps were performed using a UK lizardite-rich serpentine. Temperature, solid/liquid ratio, particle size, concentration and molar ratio were evaluated. An optimal dissolution efficiency of 69.6% was achieved over 3 h at 100 [degrees]C using 1.4 M sodium bisulphate and 50 g/l serpentine with particle size 75-150 [mu]m. An optimal carbonation efficiency of 95.4% was achieved over 30 min at 90 [degrees]C and 1:1 magnesium:sodium carbonate molar ratio using non-synthesised solution. The CO.sub.2 sequestration capacity was 223.6 g carbon dioxide/kg serpentine (66.4% in terms of Mg bonded to hydromagnesite), which is comparable with those obtained using ammonium based processes. Therefore, lizardite-rich serpentinites represent a valuable resource for the NaHSO.sub.4/NaOH based pH swing mineralisation process.
Carbon dioxide sequestration using NaHSO.sub.4 and NaOH: A dissolution and carbonation optimisation study
Sanna, Aimaro (author) / Steel, Luc / Maroto-Valer, M. Mercedes
2017
Article (Journal)
English
BKL:
43.00
Carbon dioxide sequestration using NaHSO4 and NaOH: A dissolution and carbonation optimisation study
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