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Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite
The typical disposal of high-arsenic waste acid is at the expense of discharging a large quantity of hazardous solid waste, resulting in secondary pollution of arsenic. We propose a modified lime/ferric salt method for high-arsenic waste acid disposal by the stepwise formation of gypsum and scorodit...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9048247/ https://www.ncbi.nlm.nih.gov/pubmed/35492560 http://dx.doi.org/10.1039/c9ra06568g |
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author | Qi, Xianjin Li, Yongkui Wei, Longhua Hao, Fengyan Zhu, Xing Wei, Yonggang Li, Kongzhai Wang, Hua |
author_facet | Qi, Xianjin Li, Yongkui Wei, Longhua Hao, Fengyan Zhu, Xing Wei, Yonggang Li, Kongzhai Wang, Hua |
author_sort | Qi, Xianjin |
collection | PubMed |
description | The typical disposal of high-arsenic waste acid is at the expense of discharging a large quantity of hazardous solid waste, resulting in secondary pollution of arsenic. We propose a modified lime/ferric salt method for high-arsenic waste acid disposal by the stepwise formation of gypsum and scorodite at atmospheric pressure. The sulfuric acid in the high-arsenic waste acid is first removed by calcium carbonate generating gypsum, and then the arsenic in the solution is precipitated in form of scorodite. Gypsum with an arsenic leaching concentration below 5 mg L(−1) is obtained at a final pH of 0.5 in the calcium carbonate neutralization stage. In the second stage, the optimal conditions including a starting pH of 2.0, an Fe/As ratio of 1.5, a reaction temperature in the range of 80–90 °C and a reaction time equal to or longer than 8 hours provide an arsenic removal efficiency of 95.34% by the formation of well-crystallized and environmentally stable scorodite with grain sizes in a range of 1–5 μm. The proposed process offers a promising and facile solution for the low-cost disposal of high-arsenic waste acid in the nonferrous metallurgical industry, which enables an efficient arsenic removal with the good accessibility of chemical reagents and facilities. |
format | Online Article Text |
id | pubmed-9048247 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-90482472022-04-28 Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite Qi, Xianjin Li, Yongkui Wei, Longhua Hao, Fengyan Zhu, Xing Wei, Yonggang Li, Kongzhai Wang, Hua RSC Adv Chemistry The typical disposal of high-arsenic waste acid is at the expense of discharging a large quantity of hazardous solid waste, resulting in secondary pollution of arsenic. We propose a modified lime/ferric salt method for high-arsenic waste acid disposal by the stepwise formation of gypsum and scorodite at atmospheric pressure. The sulfuric acid in the high-arsenic waste acid is first removed by calcium carbonate generating gypsum, and then the arsenic in the solution is precipitated in form of scorodite. Gypsum with an arsenic leaching concentration below 5 mg L(−1) is obtained at a final pH of 0.5 in the calcium carbonate neutralization stage. In the second stage, the optimal conditions including a starting pH of 2.0, an Fe/As ratio of 1.5, a reaction temperature in the range of 80–90 °C and a reaction time equal to or longer than 8 hours provide an arsenic removal efficiency of 95.34% by the formation of well-crystallized and environmentally stable scorodite with grain sizes in a range of 1–5 μm. The proposed process offers a promising and facile solution for the low-cost disposal of high-arsenic waste acid in the nonferrous metallurgical industry, which enables an efficient arsenic removal with the good accessibility of chemical reagents and facilities. The Royal Society of Chemistry 2019-12-23 /pmc/articles/PMC9048247/ /pubmed/35492560 http://dx.doi.org/10.1039/c9ra06568g Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/ |
spellingShingle | Chemistry Qi, Xianjin Li, Yongkui Wei, Longhua Hao, Fengyan Zhu, Xing Wei, Yonggang Li, Kongzhai Wang, Hua Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite |
title | Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite |
title_full | Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite |
title_fullStr | Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite |
title_full_unstemmed | Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite |
title_short | Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite |
title_sort | disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9048247/ https://www.ncbi.nlm.nih.gov/pubmed/35492560 http://dx.doi.org/10.1039/c9ra06568g |
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