Indirect mineral carbonation of phosphogypsum for CO2 sequestration. (1st September 2020)

• Record Type: Journal Article
• Authors: Chen, Qiuju; Ding, Wenjin; Sun, Hongjuan; Peng, Tongjiang; Ma, Guohua
• Is Part Of: Energy. Volume 206(2020)
• Publication Date: 2020-09-01
• Subjects: Phosphogypsum -- CO2 sequestration -- NaCl -- Cyclic utilization -- Polymorph; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2020.118148
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: An indirect mineral carbonation of phosphogypsum with NaCl and NH4 OH was proposed. The effect of different process conditions on the extracting process of CaSO4 ·2H2 O in phosphogypsum, the carbonation ratio of Ca 2+ in the CaSO4 ·2H2 O lixivium, and the crystal phase and morphology of the product during the carbonation process were systematically discussed. NaCl was tried to be reused. Impacts of NaCl recycling number on the carbonation reaction efficiency and the crystal phase of the carbonated products were also studied. The leaching rate of Ca 2+ in phosphogypsum was 49.42% under the optimized conditions. The carbonation ratio was 96.31%. The carbonated product composed of pure calcite, or vaterite and calcite was successfully prepared by adjusting the reaction conditions and NaCl cycle number. The performance of the obtained product met the Chinese standard requirements of HG/T 2226–2010. The proposed PG carbonation strategy showed potential prospect of application. Graphical abstract: Image 1 Highlights: An indirect PG carbonation process was successfully proposed. CaSO4 ·2H2 O was extracted from PG under the action of NaCl. The performance of the obtained product met the Chinese standard requirements of HG/T 2226–2010. NaCl could be used for 4 times in the whole carbonation process.