Kashim M Zuhaili, Tsegab Haylay, Rahmani Omeid, Abu Bakar Zainol Affendi, Aminpour Shahram M
Department of Geoscience, Universiti Teknologi PETRONAS (UTP), 32610Seri Iskandar, Tronoh, Perak Darul Ridzuan, Malaysia.
Department of Gas Sustainability Technology, PETRONAS Research Sdn Bhd, Kawasan Institusi Bangi, Kajang 43000, Selangor Darul Ehsan, Malaysia.
ACS Omega. 2020 Nov 2;5(45):28942-28954. doi: 10.1021/acsomega.0c02358. eCollection 2020 Nov 17.
The research presented here investigates the reaction mechanism of wollastonite in situ mineral carbonation for carbon dioxide (CO) 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 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 mineralization of calcium silicate at the GCS condition, which may enable us to predict the fate of the injected CO, and its subsurface geochemical evolution during the CO-fluid-rock interaction.
本文所呈现的研究探讨了硅灰石原位矿物碳酸化用于二氧化碳（CO₂）封存的反应机理。由于硅灰石含有高钙（Ca）含量，它被认为是矿物碳酸化过程中的合适原料。为了评估硅灰石用于地质CO₂封存（GCS）的反应机理，在一系列温度范围为35至90°C、压力范围为1500至4000 psi以及盐度范围为0至90000 mg/L NaCl的条件下进行了一系列碳酸化实验。动力学批次建模结果分别在1500 psi和65°C的特定压力和温度下通过碳酸化实验进行了验证。结果表明，钙的溶解分别随着压力从1500 psi增加到4000 psi以及盐度从0增加到90000 mg/L NaCl而增加。然而，随着反应温度从35°C升高到90°C，钙浓度降低了49%。此外，从研究结果可以清楚地看出，改变压力和盐度时碳酸化效率仅显示出微小差异（即±2%），而随着反应温度升高，碳酸化效率提高了62%。这些发现可以提供关于GCS条件下硅酸钙CO₂矿化的信息，这可能使我们能够预测注入的CO₂的命运及其在CO₂ - 流体 - 岩石相互作用过程中的地下地球化学演化。
