Preparation of High-purity and High-white CaCO3 by Phosphogypsum Mineralization for CO2 Capture
ZHAO Hongtao1,2, WANG Shumin1, LIU Zhijiang1, ZHANG Man3
1 National Energy Investment Group Co., Ltd., Beijing 100011 2 School of Environment, Tsinghua University, Beijing 100084 3 School of Environmental Engineering, North China Institute of Science and Technology, Langfang 065201
Abstract: In order to increase the conversion ratio, reaction rate of phosphogypsum (PG) mineral carbonation for CO2 capture and the purity and whiteness of CaCO3 product, firstly, the purified gypsum was prepared through PG efficient impurity removal technology and then to fix CO2 under pressurized condition. The characterization of purified gypsum, CaCO3 product, the carbonation conversion ratio and the reaction rate were comparatively analyzed by XRF, XRD, SEM and whiteness analyzer. The results showed that almost all impurities in PG were effectively removed through this efficient purification technology. Due to the substantial elimination of the effects of adverse impurities on the dissociation of phosphogypsum and carbonation reaction, not only the conversion ratio increased from 97.5% to 99.5% and the reaction rate also increased slightly, but also the purity of CaCO3 product increased from 86.5% to 99.1%, the whiteness increased sharply from 47.8% to 91.7%, and CaCO3 crystalline form translated from calcite into aragonite. The significant increase of purity and whiteness of CaCO3 product, correspon-dingly higher added value and wider application, will greatly enhance the economy and industrial application of PG mineral carbonation for CO2 capture, eventually providing a new idea for carbon dioxide capture and co-production of high-quality carbonate products and efficient recycling of phosphogypsum.
赵红涛, 王树民, 刘志江, 张曼. 磷石膏矿化固定CO2制备高纯高白CaCO3[J]. 材料导报, 2019, 33(18): 3031-3034.
ZHAO Hongtao, WANG Shumin, LIU Zhijiang, ZHANG Man. Preparation of High-purity and High-white CaCO3 by Phosphogypsum Mineralization for CO2 Capture. Materials Reports, 2019, 33(18): 3031-3034.
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2019, Vol. 33 
