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CO 2 sequestration: high conversion of gypsum into CaCO 3 by ultrasonic carbonation
Environmental Chemistry Letters ( IF 15.7 ) Pub Date : 2020-04-05 , DOI: 10.1007/s10311-020-00997-9
Bo Wang , Zihe Pan , Huaigang Cheng , Yihao Guan , Zhien Zhang , Fangqin Cheng

Offsetting global warming requires rapid methods to sequester atmospheric carbon dioxide (CO2), a major greenhouse gas. For instance, mineral carbonation of gypsum from flue gas desulfurization (FGD) is a potential technology for CO2 sequestration, yet reaction conditions are not actually optimized to produce a recyclable product. Here, we transformed gypsum, CaSO4·2H2O, into vaterite, CaCO3, by sonication. We studied conversion, phase compositions and morphologies of carbonation products, and sulfate (SO42−) concentrations during carbonation. Results show that the conversion of CaSO4·2H2O increased from 60 to 98% with ultrasonic amplitude. Pure vaterite was obtained at 50% ultrasonic amplitude in 30 min. Low Ca2+/CO32− ratio, high concentration of SO42− and their synergistic effects appear as key factors to form vaterite. Overall, findings reveal the feasibility of gypsum carbonation to produce high-value vaterite by sonication.



中文翻译:

固存CO 2:超声碳化将石膏高转化为CaCO 3

抵消全球变暖需要快速的方法来隔离大气中的主要温室气体二氧化碳(CO 2)。例如,来自烟道气脱硫(FGD)的石膏矿物碳酸化是封存CO 2的潜在技术,但实际上并未优化反应条件以生产可循环利用的产品。在这里,我们通过超声处理将石膏CaSO 4 ·2H 2 O转变为球v石CaCO 3。我们研究了碳酸化产物的转化率,相组成和形态,以及碳酸化过程中的硫酸盐(SO 4 2-)浓度。结果表明,CaSO 4 ·2H 2的转化O随着超声振幅从60%增加到98%。在30分钟内以50%的超声振幅获得纯球v石。Ca 2+ / CO 3 2-的比率低,SO 4 2-的浓度高以及它们的协同作用是形成球ate石的关键因素。总体而言,研究结果揭示了通过声处理石膏碳酸化生产高价值球v石的可行性。

更新日期:2020-04-21
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