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A Novel Process to Recover Gypsum from Phosphogypsum
In this study, we investigated a coarse phosphogypsum containing 49.63% SO(3), 41.41% CaO, 10.68%, 4.47% SiO(2), 1.28% P(2)O(5), 0.11% F, CaSO(4)·2H(2)O purity of 80.65%, and whiteness of 27.68. Phosphogypsum contains calcium sulfate dehydrate as the main mineral, with small amounts of brushite, qua...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8911940/ https://www.ncbi.nlm.nih.gov/pubmed/35269175 http://dx.doi.org/10.3390/ma15051944 |
_version_ | 1784666970635894784 |
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author | Xiao, Junhui Lu, Tao Zhuang, Yuanfa Jin, Huang |
author_facet | Xiao, Junhui Lu, Tao Zhuang, Yuanfa Jin, Huang |
author_sort | Xiao, Junhui |
collection | PubMed |
description | In this study, we investigated a coarse phosphogypsum containing 49.63% SO(3), 41.41% CaO, 10.68%, 4.47% SiO(2), 1.28% P(2)O(5), 0.11% F, CaSO(4)·2H(2)O purity of 80.65%, and whiteness of 27.68. Phosphogypsum contains calcium sulfate dehydrate as the main mineral, with small amounts of brushite, quartz, muscovite, and zoisite. Harmful elements, such as silicon, phosphorus, and fluorine, are mainly concentrated in the +0.15 mm and −0.025 mm fraction, which can be pre-selected and removed by the grading method to further increase the CaSO(4)·2H(2)O content. Gypsum was recovered using a direct flotation method, which included one roughing, one scavenging, and two cleaning operations, from −0.15 mm to +0.025 mm. The test results show that a gypsum concentrate with a CaSO(4)·2H(2)O purity of 98.94%, CaSO(4)·2H(2)O recovery of 80.02%, and whiteness of 37.05 was achieved. The main mineral in the gypsum concentrate was gypsum, and limited amounts of muscovite and zoisite entered the gypsum concentrate because of the mechanical entrainment of the flotation process. |
format | Online Article Text |
id | pubmed-8911940 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-89119402022-03-11 A Novel Process to Recover Gypsum from Phosphogypsum Xiao, Junhui Lu, Tao Zhuang, Yuanfa Jin, Huang Materials (Basel) Article In this study, we investigated a coarse phosphogypsum containing 49.63% SO(3), 41.41% CaO, 10.68%, 4.47% SiO(2), 1.28% P(2)O(5), 0.11% F, CaSO(4)·2H(2)O purity of 80.65%, and whiteness of 27.68. Phosphogypsum contains calcium sulfate dehydrate as the main mineral, with small amounts of brushite, quartz, muscovite, and zoisite. Harmful elements, such as silicon, phosphorus, and fluorine, are mainly concentrated in the +0.15 mm and −0.025 mm fraction, which can be pre-selected and removed by the grading method to further increase the CaSO(4)·2H(2)O content. Gypsum was recovered using a direct flotation method, which included one roughing, one scavenging, and two cleaning operations, from −0.15 mm to +0.025 mm. The test results show that a gypsum concentrate with a CaSO(4)·2H(2)O purity of 98.94%, CaSO(4)·2H(2)O recovery of 80.02%, and whiteness of 37.05 was achieved. The main mineral in the gypsum concentrate was gypsum, and limited amounts of muscovite and zoisite entered the gypsum concentrate because of the mechanical entrainment of the flotation process. MDPI 2022-03-05 /pmc/articles/PMC8911940/ /pubmed/35269175 http://dx.doi.org/10.3390/ma15051944 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Xiao, Junhui Lu, Tao Zhuang, Yuanfa Jin, Huang A Novel Process to Recover Gypsum from Phosphogypsum |
title | A Novel Process to Recover Gypsum from Phosphogypsum |
title_full | A Novel Process to Recover Gypsum from Phosphogypsum |
title_fullStr | A Novel Process to Recover Gypsum from Phosphogypsum |
title_full_unstemmed | A Novel Process to Recover Gypsum from Phosphogypsum |
title_short | A Novel Process to Recover Gypsum from Phosphogypsum |
title_sort | novel process to recover gypsum from phosphogypsum |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8911940/ https://www.ncbi.nlm.nih.gov/pubmed/35269175 http://dx.doi.org/10.3390/ma15051944 |
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