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首页> 外文期刊>Crystal growth & design >Monitoring the effect of mineral precursor, fluid phase CO _2-H_2O composition, and stirring on CaCO_3 crystallization in a supercritical-ultrasound carbonation process
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Monitoring the effect of mineral precursor, fluid phase CO _2-H_2O composition, and stirring on CaCO_3 crystallization in a supercritical-ultrasound carbonation process

机译：在超临界超声碳化过程中，监测矿物前体，液相CO _2-H_2O组成和搅拌对CaCO_3结晶的影响

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摘要

This study focuses on the evaluation of the different factors that affect the particle size distribution of precipitated calcium carbonate formed in a wet supercritical CO_2 carbonation process and on the conversion rate from two different Ca~(2+) precursors (Ca(OH)_2 or CaO). The operating factors investigated include the composition of the fluid phase (CO_2/H_2O) in contact with the solid precursor, the calcium cation source, and the stirring mode (no agitation, vertical mechanical, and ultrasound). The calcium carbonate particles were fabricated in batch mode in a stainless steel reactor filled with the solid precursor, water, and scCO _2 at 130 bar and 40 °C. The particle size was estimated using scanning electron microscopy, while the precipitated solid phase composition was determined by a quantitative characterization method based on X-ray diffraction. The conversion of CaO or Ca(OH)_2 to CaCO_3 varied from 50 to >90 wt % depending on the reactor fill level and the existence of a rich-water phase in equilibrium with the scCO_2-rich fluid. It was found that micrometric particles were precipitated in systems containing a large quantity of water in the fluid phase, while nanometric calcite was formed when using a reduced water percentage. The use of ultrasound stirring accelerated the kinetics of the carbonation process, thus increasing the calcium carbonate yield. The highest conversion rates were obtained using CaO as the solid precursor.
机译：这项研究的重点是评估影响湿超临界CO_2碳酸化过程中形成的沉淀碳酸钙粒径分布的不同因素，以及两种不同Ca〜（2+）前体（Ca（OH）_2或CaO）。研究的操作因素包括与固体前体接触的液相（CO_2 / H_2O）组成，钙阳离子源和搅拌模式（不进行搅拌，垂直机械搅拌和超声搅拌）。在填充有固体前体，水和scCO _2的不锈钢反应器中，在130 bar和40°C下，以间歇方式制备碳酸钙颗粒。使用扫描电子显微镜估计粒径，同时通过基于X射线衍射的定量表征方法确定沉淀的固相组成。 CaO或Ca（OH）_2到CaCO_3的转化率从50％到> 90 wt％不等，具体取决于反应器填充水平和与富含scCO_2的流体处于平衡状态的富水相的存在。已发现，微米级颗粒在液相中包含大量水的系统中沉淀，而当使用降低的水百分比时会形成纳米方解石。超声搅拌的使用加速了碳酸化过程的动力学，从而提高了碳酸钙的产率。使用CaO作为固体前体可获得最高的转化率。

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