Investigation on the fluorine recovery mechanism by air stripping for synthetic and industrial wet process phosphoric acid

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2023-07-14 DOI:10.1007/s42823-023-00573-5

Binbin He, Yun Zu, Yunxiang Nie, Yi Mei

{"title":"Investigation on the fluorine recovery mechanism by air stripping for synthetic and industrial wet process phosphoric acid","authors":"Binbin He, Yun Zu, Yunxiang Nie, Yi Mei","doi":"10.1007/s42823-023-00573-5","DOIUrl":null,"url":null,"abstract":"<div>Fluorine (F) recovery from wet process phosphoric acid (WPA) is essential for sustainable resource utilization and environmental protection. This work systematically investigates the F recovery mechanism by air stripping from three simulated systems: H3PO4-H2SiF6-H2O, H3PO4-HF-H2O, H3PO4-H2SiF6-HF-Al3+-H2O, and from two industrial systems: WPA and WPA-Al3+ under different stripping temperatures (60–110 ℃) and stripping times (0–120 min). The influence on the existence form of F, the content of Al3+ cations and the addition of active silica on the F removal rate in the phosphoric acid solution is studied by analyzing the changes in the contents of F, P and Si. The results indicate that the F in the form of H2SiF6 is more easily released from the phosphoric acid solution than that in the form of HF. While, the release of F is inhibited in the presence of the Al3+ in the solution due to the formation of Al-F complexes that are characterized by 19F NMR, 31Si NMR and FTIR techniques. Interestingly, the addition of active silica can promote the conversion of HF to H2SiF6 in the solution and significantly improve the release rate of F. The researching results can provide an important guidance for industrial practice of WPA.</div>","PeriodicalId":506,"journal":{"name":"Carbon Letters","volume":"33 7","pages":"2313 - 2325"},"PeriodicalIF":5.5000,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Carbon Letters","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s42823-023-00573-5","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 1

Abstract

Fluorine (F) recovery from wet process phosphoric acid (WPA) is essential for sustainable resource utilization and environmental protection. This work systematically investigates the F recovery mechanism by air stripping from three simulated systems: H₃PO₄-H₂SiF₆-H₂O, H₃PO₄-HF-H₂O, H₃PO₄-H₂SiF₆-HF-Al³⁺-H₂O, and from two industrial systems: WPA and WPA-Al³⁺ under different stripping temperatures (60–110 ℃) and stripping times (0–120 min). The influence on the existence form of F, the content of Al³⁺ cations and the addition of active silica on the F removal rate in the phosphoric acid solution is studied by analyzing the changes in the contents of F, P and Si. The results indicate that the F in the form of H₂SiF₆ is more easily released from the phosphoric acid solution than that in the form of HF. While, the release of F is inhibited in the presence of the Al³⁺ in the solution due to the formation of Al-F complexes that are characterized by ¹⁹F NMR, ³¹Si NMR and FTIR techniques. Interestingly, the addition of active silica can promote the conversion of HF to H₂SiF₆ in the solution and significantly improve the release rate of F. The researching results can provide an important guidance for industrial practice of WPA.

查看原文本刊更多论文

合成及工业湿法磷酸气提回收氟机理的研究

湿法磷酸(WPA)中氟的回收是资源可持续利用和环境保护的重要手段。本文系统研究了不同汽提温度(60 ~ 110℃)和不同汽提时间(0 ~ 120 min)下，H3PO4-H2SiF6-H2O、H3PO4-H2SiF6-HF-Al3+-H2O三种模拟体系以及WPA和WPA- al3 +两种工业体系的F回收机理。通过分析磷酸溶液中F、P、Si含量的变化，研究了F的存在形式、Al3+阳离子含量和活性二氧化硅的加入对F去除率的影响。结果表明，以H2SiF6形式存在的F比以HF形式存在的F更容易从磷酸溶液中释放出来。而在溶液中存在Al3+时，由于形成Al-F配合物，F的释放被抑制，这些配合物通过19F NMR, 31Si NMR和FTIR技术进行了表征。有趣的是，活性二氧化硅的加入可促进溶液中HF向H2SiF6的转化，显著提高f的释放率，研究结果可为WPA的工业实践提供重要指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.