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Indirect aqueous carbonation of CaSO(4)·2H(2)O with aspartic acid as a recyclable additive

Calcium leaching using additives is the most critical step in the indirect aqueous carbonation process of CaSO(4)·2H(2)O. However, recovery of the soluble additives from the sulfate-rich carbonation filtrate limits the large-scale industrial implementation of current carbonation technologies. To add...

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Autores principales: Gong, Yuan, Zhu, Xuechen, Yang, Zhuo, Zhang, Xin, Li, Chunlei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9486826/
https://www.ncbi.nlm.nih.gov/pubmed/36275170
http://dx.doi.org/10.1039/d2ra03763g
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author Gong, Yuan
Zhu, Xuechen
Yang, Zhuo
Zhang, Xin
Li, Chunlei
author_facet Gong, Yuan
Zhu, Xuechen
Yang, Zhuo
Zhang, Xin
Li, Chunlei
author_sort Gong, Yuan
collection PubMed
description Calcium leaching using additives is the most critical step in the indirect aqueous carbonation process of CaSO(4)·2H(2)O. However, recovery of the soluble additives from the sulfate-rich carbonation filtrate limits the large-scale industrial implementation of current carbonation technologies. To address this issue, we employed aspartic acid (Asp) as a leaching additive. The dissolution capability of CaSO(4)·2H(2)O in aqueous ammonia was found to improve significantly owing to the complexation effect between Asp and the Ca(2+) ions. The maximum amount of dissolved CaSO(4)·2H(2)O was determined according to the competitive relationship between the complexing effect and the inhibitory effect of free ammonia molecules on the dissociation of CaSO(4)·2H(2)O, and the solution pH influences such competition. The precipitation of CaCO(3) was examined by monitoring the variations in the pH and conductivity of the carbonation reaction system. As a result, the shift in the Asp dissociation equilibrium extended the induction period, and the growth period was divided into three stages according to the relative difference between the consumption and formation rates of CO(3)(2−). Moreover, it was determined that the carbonation products consisted of stable spherical vaterite particles. The recovery of Asp was also demonstrated at its isoelectric point, with a recovery efficiency of >80% being achieved, and recycling experiments confirmed the stability of the recycled Asp. Finally, the amount of dissolved CaSO(4)·2H(2)O and the total carbonation efficiency during cycling were determined as 16.3 ± 0.4 g L(−1) and 46.5 ± 1.9%, respectively.
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spelling pubmed-94868262022-10-20 Indirect aqueous carbonation of CaSO(4)·2H(2)O with aspartic acid as a recyclable additive Gong, Yuan Zhu, Xuechen Yang, Zhuo Zhang, Xin Li, Chunlei RSC Adv Chemistry Calcium leaching using additives is the most critical step in the indirect aqueous carbonation process of CaSO(4)·2H(2)O. However, recovery of the soluble additives from the sulfate-rich carbonation filtrate limits the large-scale industrial implementation of current carbonation technologies. To address this issue, we employed aspartic acid (Asp) as a leaching additive. The dissolution capability of CaSO(4)·2H(2)O in aqueous ammonia was found to improve significantly owing to the complexation effect between Asp and the Ca(2+) ions. The maximum amount of dissolved CaSO(4)·2H(2)O was determined according to the competitive relationship between the complexing effect and the inhibitory effect of free ammonia molecules on the dissociation of CaSO(4)·2H(2)O, and the solution pH influences such competition. The precipitation of CaCO(3) was examined by monitoring the variations in the pH and conductivity of the carbonation reaction system. As a result, the shift in the Asp dissociation equilibrium extended the induction period, and the growth period was divided into three stages according to the relative difference between the consumption and formation rates of CO(3)(2−). Moreover, it was determined that the carbonation products consisted of stable spherical vaterite particles. The recovery of Asp was also demonstrated at its isoelectric point, with a recovery efficiency of >80% being achieved, and recycling experiments confirmed the stability of the recycled Asp. Finally, the amount of dissolved CaSO(4)·2H(2)O and the total carbonation efficiency during cycling were determined as 16.3 ± 0.4 g L(−1) and 46.5 ± 1.9%, respectively. The Royal Society of Chemistry 2022-09-20 /pmc/articles/PMC9486826/ /pubmed/36275170 http://dx.doi.org/10.1039/d2ra03763g Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Gong, Yuan
Zhu, Xuechen
Yang, Zhuo
Zhang, Xin
Li, Chunlei
Indirect aqueous carbonation of CaSO(4)·2H(2)O with aspartic acid as a recyclable additive
title Indirect aqueous carbonation of CaSO(4)·2H(2)O with aspartic acid as a recyclable additive
title_full Indirect aqueous carbonation of CaSO(4)·2H(2)O with aspartic acid as a recyclable additive
title_fullStr Indirect aqueous carbonation of CaSO(4)·2H(2)O with aspartic acid as a recyclable additive
title_full_unstemmed Indirect aqueous carbonation of CaSO(4)·2H(2)O with aspartic acid as a recyclable additive
title_short Indirect aqueous carbonation of CaSO(4)·2H(2)O with aspartic acid as a recyclable additive
title_sort indirect aqueous carbonation of caso(4)·2h(2)o with aspartic acid as a recyclable additive
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9486826/
https://www.ncbi.nlm.nih.gov/pubmed/36275170
http://dx.doi.org/10.1039/d2ra03763g
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