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Formation of CaCO_(3) hollow microspheres in carbonated distiller waste from Solvay soda ash plants

Frontiers of Chemical Science and Engineering 2022年第11期16卷 1659-1671页

作者： Wenjiao Xu Huaigang Cheng Enze Li Zihe Pan Fangqin Cheng Institute of Resources and Environmental Engineering Engineering Research Center of CO_(2)Emission Reduction and Resource UtilizationMinistry of Education of the People’s Republic of ChinaShanxi UniversityTaiyuan 030006China

For decades,distiller waste and CO_(2) were not the first choice for production of high valued ***,CaCO_(3) hollow microspheres,a high-value product was synthesized from such a reaction *** synthetic methods,the formation mechanism and operational cost were *** 2.5 L·min^(–1)·L^(–1) CO_(2) was flowed into distiller waste(pH=11.4),spheres with 4–13μm diameters and about 2μm shell thickness were *** is found that there is a transformation of CaCO_(3) particles from solid-cubic nuclei to hollow ***,the Ca(OH)_(2) in the distiller waste stimulated the nucleation of calcite with a non-template effect and further maintained the calcite form and prevented the formation of ***,in absence of auxiliaries,the formation of hollow structures mainly depended on the growth and aging of CaCO_(3).Studies on the crystal morphology and its changes during the growth process point to the inside–out ostwald effect in the formation of hollow *** in chemical properties of the bulk solution caused changes in interfacial tension and interfacial energy,which promoted the morphological transformation of CaCO_(3) particles from cubic calcite to spherical ***,the flow process for absorption of CO_(2) by distiller waste was designed and found profitable.

关键词： distiller waste CO_(2) hollow microsphere CaCO_(3) Ca(OH)_(2) inside−out ostwald effect

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