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

He Binbin; Zu Yun; Nie Yunxiang; Mei Yi

doi:10.1007/s42823-023-00573-5

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

Carbon Letters
Abbr : Carbon Lett.
2023, 33(7), pp.2313-2325
DOI : 10.1007/s42823-023-00573-5
Publisher : Korean Carbon Society
Research Area : Natural Science > Natural Science General > Other Natural Sciences General
Received : May 26, 2023
Accepted : July 4, 2023
Published : December 1, 2023

He Binbin ¹, Zu Yun ¹, Nie Yunxiang ¹, Mei Yi ¹

¹Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, People’s Republic of China

Accredited

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.

KEYWORDS

Wet process phosphoric acid Fluorine recovery Air stripping Al3+ cation Fluorosilicic acid

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Carbon Letters 2023 KCI Impact Factor : 1.35 KCI-WoS Impact Factor : 6.04

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

ABSTRACT

KEYWORDS

Citation status

This is the result of checking the information with the same ISSN, publication year, volume, and start page between the WoS and the KCI journals. (as of 2024-07-26)

Total Citation Counts(KCI+WOS) (3) This is the number of times that the duplicate count has been removed by comparing the citation list of WoS and KCI.

Scopus Citation Counts (3) This is the result of checking the information with the same ISSN, publication year, volume, and start page between articles in KCI and the SCOPUS journals. (as of 2024-07-01)

* References for papers published after 2023 are currently being built.

Carbon Letters 2023 KCI Impact Factor : 1.35 KCI-WoS Impact Factor : 6.04

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

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WoS Citation Counts (3) This is the result of checking the information with the same ISSN, publication year, volume, and start page between the WoS and the KCI journals. (as of 2024-07-26)

Total Citation Counts(KCI+WOS) (3) This is the number of times that the duplicate count has been removed by comparing the citation list of WoS and KCI.

Scopus Citation Counts (3) This is the result of checking the information with the same ISSN, publication year, volume, and start page between articles in KCI and the SCOPUS journals. (as of 2024-07-01)

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