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Updated: Feb 5, 2026

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
Published on: August 1, 2017
Highly efficient fluoride extraction from simulant leachate of spent potlining via La-loaded chelating resin. An
Thomas Robshaw1, Sudhir Tukra2, Deborah B Hammond3
1Separations and Nuclear Chemical Engineering Research (SNUCER), Department of Chemical & Biological Engineering, University of Sheffield, Sheffield, S1 3JD, United Kingdom.
Abstract:
Spent potlining (SPL) hazardous waste is a potentially valuable source of fluoride, which may be recovered through chemical leaching and adsorption with a selective sorbent. For this purpose, the commercially available chelating resin Purolite® S950+ was loaded with lanthanum ions, to create a novel ligand-exchange sorbent. The equilibrium fluoride uptake behaviour of the resin was thoroughly investigated, using NaF solution and a simulant leachate of SPL waste. The resin exhibited a large maximum defluoridation capacity of 187 ± 15 mg g-1 from NaF solution and 126 ± 10 mg g-1 from the leachate, with solution pH being strongly influential to uptake performance. Isotherm and spectral data indicated that both chemisorption and unexpected physisorption processes were involved in the fluoride extraction and suggested that the major uptake mechanism differed in each matrix. The resin demonstrates significant potential in the recovery of fluoride from aqueous waste-streams.
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