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Crystallization

Removal and recovery of fluoride from wastewater by crystallization: effect of aluminum

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Pages 1241-1246 | Received 21 Dec 2017, Accepted 25 Sep 2018, Published online: 04 Oct 2018
 

ABSTRACT

The effect of aluminum on the treatment of fluorine-containing synthetic wastewater by crystallization was investigated. The results showed that the optimal conditions for fluoride removal were found at pH 7.2–10.5, and at an aluminum concentration of 80–700 mg/L. During operation of the fluidized bed reactor, the effluent fluoride concentration was 13–25 mg/L at an influent aluminum concentration of 80–150 mg/L. The recovered pellets matched well with the national standard of fluorspar in China (GB19321-88). It was feasible to recover calcium fluoride from fluorine and aluminum-containing wastewater by crystallization.

Additional information

Funding

This research was supported by the Major Science and Technology Program of Hunan (China) under Grant NO. 2009FJ-1009.

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