Carbonation of natural pure and impure wollastonite
Carbonation of natural pure and impure wollastonite
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天然纯硅灰石和非纯硅灰石的碳化
DOI：
10.1007/s42452-019-0328-4
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发表时间：
2019
影响因子：
2.6
通讯作者：
H. Pöllmann
中科院分区：
文献类型：
--
作者：
Kristoff Svensson;A. Neumann;Flora Feitosa Menezes;C. Lempp;H. Pöllmann
硅灰石可以用作水泥材料，例如用于碳捕获和储存（CCS应用）。硅灰石（CS）和纯CO2在水的存在下，在温度（333 K）相关的CCS注入条件的相互作用进行了研究内的联合BMWi研究项目集群。在变质作用中描述硅灰石形成的反应是相反的。硅灰石在含水条件下在CO2压力的存在下反应以形成碳酸钙和无定形氧化硅。为了确定该反应的驱动力，重要的是研究CO2压力（p）和温度（T）的影响。硅灰石碳酸化反应动力学对温度有很强的依赖性。在333 K和2 MPa CO2下，$${\bar {C}}$$C <$CS反应快速（≤ 24 h）。采用X射线荧光光谱法对硅灰石的化学成分进行了分析。为了定量测定反应的转化率，应用粉末X射线衍射与Rietveld方法。对于进一步的应用，重要的是要了解碳酸化过程中的具体反应。为此，研究了硅灰石原料在碳酸化实验前的不同处理（盐酸、醋酸和温度）对碳酸化反应的影响。硅灰石的转化，取决于温度，成功地进行。可以证明，文石作为种子晶体进一步文石的形成。此外，观察到由无定形CaCO 3形成文石的迹象。
Wollastonite can be used as cementitious material, for example in carbon capture and storage (CCS application). The interaction of wollastonite (CS) and pure CO2 in the presence of H2O at temperature (333 K) relevant to injection conditions for CCS were investigated within the joint BMWi research project CLUSTER. The reaction which describes the formation of wollastonite during metamorphism, is reversed. Wollastonite reacts in the presence of CO2-pressure under aqueous conditions to form calcium carbonate and amorphous silicon oxide. To determine the driving force for this reaction it is important to investigate the impact of CO2 pressure (p) and temperature (T). The reaction kinetics of the carbonation reaction of wollastonite is strongly dependent to temperature. At 333 K and 2 MPa CO2 the $${\bar{\text{C}}}$$C¯CS reaction is fast (≤ 24 h). The chemical composition of wollastonite was analyzed by X-ray fluorescence. To determine the conversion rate of the reaction quantitatively powder X-ray diffraction with Rietveld method were applied. For further application, it is important to understand the specific reactions during the carbonation. Therefore, the influence of different treatments on wollastonite raw material (hydrochloric acid, acetic acid and temperature), before the carbonation experiments, on the carbonation reaction were investigated. The conversion of wollastonite, depending on temperature, was performed successfully. It could be proven, that aragonite acted as seed crystal for further aragonite formation. Furthermore, indications for the formation of aragonite out of amorphous CaCO3 were observed.
影响因子：
9.5
作者：
Longo, Roberto C.;Cho, Kyeongjae;Thissen, Peter
通讯作者：
Thissen, Peter