NDLI: Effect on ceramic grade CaF<sub>2</sub> recovery quality from the etching wastewater under the optimum sulfate content

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhu, Nanwen Lou, Ziyang Yin, Changkai Yuan, Haiping
Copyright Year	2016
Abstract	The improvement of fluorite quality is an attractive measure to recover fluoride from high F− content wastewater and thus reduces the fluorite sludge generation rate, and the removal of contaminant pollutants could be helpful for the production of ceramic grade fluorite (>85%). In this work, typical etching wastewater was collected and characterized, and SO42− was found to be the main barrier for high quality CaF2 production, while CaSO4 could also contribute to CaF2 precipitation. The optimum SO42− content was adjusted by the introduction of barium salts, to keep a balance between the CaF2 quality and the settlement process. The ceramic grade CaF2 of 88% was obtained under the conditions: [Ca]/[F] of 1.29, pH 8.14 and Csulfate of 117.4 mg L−1. The residual SO42− content should be kept in the range of 100–130 mg L−1, and the formation of CaSO4, combined with CaF2 could accelerate the CaF2 precipitation by the co-precipitation method, with a larger particle size from 758 nm (without SO42−) to 898 nm. The gradient settlement of CaF2 contributes to the recovery of fluoride from etching wastewater, while CaF2 preparation should be carried out in a dynamic experiment, such as a fluidized bed, for further research.
Starting Page	85870
Ending Page	85876
Page Count	7
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	6
Issue Number	89
Journal	RSC Advances
DOI	10.1039/c6ra15540e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Chemical milling Barium Fluorite Fluoride Wastewater Coprecipitation Fluidized bed
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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