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The Transition of Mg-Containing Phases and Recovery of NaCl in Molten Salt Chloride Slags at High Temperature
The molten salt chlorination method is more suitable to produce TiCl(4) using titanium-containing materials with high contents of CaO and MgO in China. However, there is a large amount of molten salt chloride slags generated from the molten salt chlorination process, which contains a variety of chlo...
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/PMC9457056/ https://www.ncbi.nlm.nih.gov/pubmed/36079363 http://dx.doi.org/10.3390/ma15175983 |
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author | Chen, Feng Wen, Yuekai Guo, Yufeng Wang, Shuai Yang, Lingzhi Zheng, Yu Li, Dongyue Ren, Yuqiao |
author_facet | Chen, Feng Wen, Yuekai Guo, Yufeng Wang, Shuai Yang, Lingzhi Zheng, Yu Li, Dongyue Ren, Yuqiao |
author_sort | Chen, Feng |
collection | PubMed |
description | The molten salt chlorination method is more suitable to produce TiCl(4) using titanium-containing materials with high contents of CaO and MgO in China. However, there is a large amount of molten salt chloride slags generated from the molten salt chlorination process, which contains a variety of chlorides and is difficult to treat, often causing serious environmental problems such as direct piling or landfilling. A novel process was proposed to deal with molten salt chloride slags, and calcium chloride could be effectively removed by this process (as in our previous study). However, magnesium chloride is another impurity which can deteriorate the density and viscosity of the molten salt; it is often found in higher contents, and should be also removed from molten salt chloride slags to efficiently recycle NaCl in novel processes. Na(2)SiO(3) is added to the molten salt chloride slags in the molten state to produce the Mg-containing solid phase, which could be separated with the molten NaCl in novel processes. Thus, the transition of Mg-containing phases and the recovery of NaCl in molten salt chloride slags at high temperature in a novel process were systematically investigated in this work, including thermodynamic analysis, the phase transition behavior of Mg-containing phases, NaCl recovery, etc. The removal rate of Mg was 99.56% when the molar ratio of MgCl(2):Na(2)SiO(3) was 1:1.5 at 1273 K and in a N(2) atmosphere. The recovery rate of NaCl from the molten salt chlorination slag was 97.62% and the purity of NaCl obtained was 99.35 wt%, which could be used in the molten salt chlorination process. |
format | Online Article Text |
id | pubmed-9457056 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-94570562022-09-09 The Transition of Mg-Containing Phases and Recovery of NaCl in Molten Salt Chloride Slags at High Temperature Chen, Feng Wen, Yuekai Guo, Yufeng Wang, Shuai Yang, Lingzhi Zheng, Yu Li, Dongyue Ren, Yuqiao Materials (Basel) Article The molten salt chlorination method is more suitable to produce TiCl(4) using titanium-containing materials with high contents of CaO and MgO in China. However, there is a large amount of molten salt chloride slags generated from the molten salt chlorination process, which contains a variety of chlorides and is difficult to treat, often causing serious environmental problems such as direct piling or landfilling. A novel process was proposed to deal with molten salt chloride slags, and calcium chloride could be effectively removed by this process (as in our previous study). However, magnesium chloride is another impurity which can deteriorate the density and viscosity of the molten salt; it is often found in higher contents, and should be also removed from molten salt chloride slags to efficiently recycle NaCl in novel processes. Na(2)SiO(3) is added to the molten salt chloride slags in the molten state to produce the Mg-containing solid phase, which could be separated with the molten NaCl in novel processes. Thus, the transition of Mg-containing phases and the recovery of NaCl in molten salt chloride slags at high temperature in a novel process were systematically investigated in this work, including thermodynamic analysis, the phase transition behavior of Mg-containing phases, NaCl recovery, etc. The removal rate of Mg was 99.56% when the molar ratio of MgCl(2):Na(2)SiO(3) was 1:1.5 at 1273 K and in a N(2) atmosphere. The recovery rate of NaCl from the molten salt chlorination slag was 97.62% and the purity of NaCl obtained was 99.35 wt%, which could be used in the molten salt chlorination process. MDPI 2022-08-30 /pmc/articles/PMC9457056/ /pubmed/36079363 http://dx.doi.org/10.3390/ma15175983 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 Chen, Feng Wen, Yuekai Guo, Yufeng Wang, Shuai Yang, Lingzhi Zheng, Yu Li, Dongyue Ren, Yuqiao The Transition of Mg-Containing Phases and Recovery of NaCl in Molten Salt Chloride Slags at High Temperature |
title | The Transition of Mg-Containing Phases and Recovery of NaCl in Molten Salt Chloride Slags at High Temperature |
title_full | The Transition of Mg-Containing Phases and Recovery of NaCl in Molten Salt Chloride Slags at High Temperature |
title_fullStr | The Transition of Mg-Containing Phases and Recovery of NaCl in Molten Salt Chloride Slags at High Temperature |
title_full_unstemmed | The Transition of Mg-Containing Phases and Recovery of NaCl in Molten Salt Chloride Slags at High Temperature |
title_short | The Transition of Mg-Containing Phases and Recovery of NaCl in Molten Salt Chloride Slags at High Temperature |
title_sort | transition of mg-containing phases and recovery of nacl in molten salt chloride slags at high temperature |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9457056/ https://www.ncbi.nlm.nih.gov/pubmed/36079363 http://dx.doi.org/10.3390/ma15175983 |
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