Precipitation recovery of boron from aqueous solution by chemical oxo-precipitation at room temperature

•99.7% of boron was recovered as barium perborate salts at room temperature.•Dissolved oxygen served as an indicator to estimate the progress of the reaction.•Phase transformation of precipitates was revealed.•The mechanisms of COP were proposed. This work investigated the effective precipitation re...

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Bibliographic Details
Published in:Applied energy 2016-02, Vol.164, p.1052-1058
Main Authors: Lin, Jui-Yen, Shih, Yu-Jen, Chen, Po-Yen, Huang, Yao-Hui
Format: Article
Language:English
Subjects:
Barium hydroxide
Barium perborate
Boron removal
Dissolved oxygen
Hydrogen peroxide
Precipitates
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Summary:•99.7% of boron was recovered as barium perborate salts at room temperature.•Dissolved oxygen served as an indicator to estimate the progress of the reaction.•Phase transformation of precipitates was revealed.•The mechanisms of COP were proposed. This work investigated the effective precipitation recovery of boron by chemical oxo-precipitation (COP), which uses hydrogen peroxide (H2O2) to transform aqueous boron to easy-precipitating perborates at room temperature. By using barium hydroxide (Ba(OH)2) as a precipitant, the boron removal enhanced with treatment time and the boron level was eventually reduced from 1000ppm to 3ppm in four hours. The transformation of the precipitates from amorphous to crystalline was assumed to be responsible for such high boron removal. The aqueous data and the characterization of the precipitates, including elemental analysis, dissolved oxygen, XRD and Raman microscopy, reveal that the phase transformation of perborate species in the precipitates carried out with time during the COP. Mechanisms of COP that describe the precipitates transformation from BaB(OH)3OOB(OH)3 and Ba(B(OH)3OOH)2 to BaB(OH)2(OO)2B(OH)2 were proposed.
ISSN:0306-2619
1872-9118
DOI:10.1016/j.apenergy.2014.12.058