Preparation of gypsum with high purity and whiteness from phosphogypsum for CO2 mineral sequestration

Phosphogypsum (PG) is a solid waste product generated during wet-process phosphoric acid production. Various impurities considerably reduce the purity, whiteness, and application range of PG. This article analyzes the physical properties of PG in detail and systematically examines the content and di...

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Bibliographic Details
Published in:Scientific reports 2023-03, Vol.13 (1), p.4156-4156, Article 4156
Main Authors: Zhang, Man, Fan, Xing
Format: Article
Language:English
Subjects:
639/4077/4057
704/172/4081
Acid production
Calcium carbonate
Carbon dioxide
Carbon dioxide fixation
Experiments
Gypsum
Humanities and Social Sciences
Impurities
Material balance
Morphology
multidisciplinary
Particle size
Phosphogypsum
Phosphoric acid
Physical properties
Science
Science (multidisciplinary)
Solid wastes
Solvents
Sulfuric acid
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Summary:Phosphogypsum (PG) is a solid waste product generated during wet-process phosphoric acid production. Various impurities considerably reduce the purity, whiteness, and application range of PG. This article analyzes the physical properties of PG in detail and systematically examines the content and distribution of impurities. Based on the obtained results, a simple process for the efficient removal of almost all impurities in the PG is proposed. The purity and whiteness of the purified gypsum (CaSO 4 ) significantly increased to 99% and 92%, respectively. The migration of impurities and the material balance of this process were then analyzed. Most importantly, the purified gypsum showed high CO 2 sequestration efficiency for CO 2 mineral sequestration, through which a high value-added CaCO 3 product was obtained.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-023-28251-6