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REVISTA DE CHIMIE
Cite as: Rev. Chim.
https://doi.org/10.37358/Rev.Chim.1949

OSIM Nr. R102355
ISSN Online 2668-8212
ISSN Print: 1582-9049
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Revista de Chimie (Rev. Chim.), Year 2014, Volume 65, Issue 4,





Cristina CALIN, Ligia STOICA, Carolina CONSTANTIN
Fluoride Ion Removal from Liquid Media by Precipitation-flotation

Abstract:

The presence of fluoride ion in some technological aqueous systems in low concentrations, but higher than the safety limit, imposed the study of separation methods that fulfill the national requirements concerning the water quality. In case of plants, where hydrofluoric acid (HF) is used in pickling tanks (e.g. special steels), the current fluoride ion removing method is the precipitation of CaF2 followed by decantation. This method does not provide a residual fluoride concentration imposed by the national regulations of 5 mg·L-1. The subject of the present contribution is the optimization of this method. It points out the research results regarding the removal of F- ion by precipitation using technical calcium hydroxide as precipitating reagent. The DAF technique - flotation in the presence of a collector and a flocculent - was used to separate the precipitate from the system. The optimum separation parameters were established and the precipitate-collector interaction mechanism was studied in order to efficiently conduct the process. The proposed solution reaches separation efficiencies nearly to 99%. Keywords: fluoride removal, precipitate-flotation, technical calcium hydroxide

Issue: 2014, Volume 65, Issue 4
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