磷石膏矿化固定CO<sub>2</sub>制备高纯高白CaCO<sub>3</sub>

doi:10.11896/cldb.18080044

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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.

Key words： phosphogypsum CO₂ carbonation purity whiteness

Published: 31 July 2019

CLC number:

TQ110.9

Fund:This work was financially supported by the National Key R & D Program of China (2017YFB0603300) and the Fundamental Research Funds for the Central Universities (3142018011).

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	Articles by authors
	ZHAO Hongtao
	WANG Shumin
	LIU Zhijiang
	ZHANG Man

Cite this article:

ZHAO Hongtao,WANG Shumin,LIU Zhijiang, et al. Preparation of High-purity and High-white CaCO₃ by Phosphogypsum Mineralization for CO₂ Capture[J]. Materials Reports, 2019, 33(18): 3031-3034.

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http://www.mater-rep.com/EN/10.11896/cldb.18080044 OR http://www.mater-rep.com/EN/Y2019/V33/I18/3031

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