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>Reaction Mechanism of Wollastonite In Situ Mineral Carbonation for CO2 Sequestration: Effects of Saline Conditions, Temperature, and Pressure
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Reaction Mechanism of Wollastonite In Situ Mineral Carbonation for CO2 Sequestration: Effects of Saline Conditions, Temperature, and Pressure
The research presented here investigates the reaction mechanism of wollastonite in situ mineral carbonation for carbon dioxide (CO_(2)) sequestration. Because wollastonite contains high calcium (Ca) content, it was considered as a suitable feedstock in the mineral carbonation process. To evaluate the reaction mechanism of wollastonite for geological CO_(2) sequestration (GCS), a series of carbonation experiments were performed at a range of temperatures from 35 to 90 °C, pressures from 1500 to 4000 psi, and salinities from 0 to 90,000 mg/L NaCl. The kinetics batch modeling results were validated with carbonation experiments at the specific pressure and temperature of 1500 psi and 65 °C, respectively. The results showed that the dissolution of calcium increases with increment in pressure and salinity from 1500 to 4000 psi and 0 to 90000 mg/L NaCl, respectively. However, the calcium concentration decreases by 49%, as the reaction temperature increases from 35 to 90 °C. Besides, it is clear from the findings that the carbonation efficiency only shows a small difference (i.e., ±2%) for changing the pressure and salinity, whereas the carbonation efficiency was shown to be enhanced by 62% with increment in the reaction temperature. These findings can provide information about CO_(2) mineralization of calcium silicate at the GCS condition, which may enable us to predict the fate of the injected CO_(2), and its subsurface geochemical evolution during the CO_(2)–fluid–rock interaction.
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机译：本发明提出的研究研究了硅灰石原位矿物质碳酸化用于二氧化碳（CO_（2））螯合的反应机理。因为硅灰石含有高钙（CA）含量，所以它被认为是矿物碳化过程中的合适原料。为了评估硅灰石对地质CO_（2）螯合（GCS）的反应机制，在35至90℃的温度范围内进行一系列碳酸化实验，从1500至4000psi的压力，0至90,000的盐度Mg / L NaCl。动力学批量建模结果验证了在比1500psi和65°C的特定压力和温度下的碳酸化实验。结果表明，钙的溶解随1500至4000psi的压力和盐度的增量和0至90000mg / L NaCl的溶解。然而，钙浓度降低49％，因为反应温度从35升至90℃。此外，从结果清楚地看出，碳化效率仅显示用于改变压力和盐度的小差异（即，±2％），而碳化效率显示在反应温度下以增量增强62％。这些发现可以在GCS条件下提供有关硅酸钙的CO_（2）矿化的信息，这可以使我们能够预测注射的CO_（2）的命运，以及在CO_（2）-FLUID岩石中的其地层地球化学演变。相互作用。
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