Original scientific paper
https://doi.org/10.15255/KUI.2020.040
Ultrasound-assisted Crystallisation of Magnesium Hydroxide from Seawater
Jelena Jakić
orcid.org/0000-0003-2286-2368
; University of Split, Faculty of Chemistry and Technology, Ruđera Boškovića 35, 21 000 Split, Croatia
Miroslav Labor
orcid.org/0000-0002-4875-4683
; University of Split, Faculty of Chemistry and Technology, Ruđera Boškovića 35, 21 000 Split, Croatia
Dražan Jozić
orcid.org/0000-0002-5026-1343
; University of Split, Faculty of Chemistry and Technology, Ruđera Boškovića 35, 21 000 Split, Croatia
Vanja Martinac
orcid.org/0000-0001-7267-2963
; University of Split, Faculty of Chemistry and Technology, Ruđera Boškovića 35, 21 000 Split, Croatia
Ivona Horvat
; University of Split, Faculty of Chemistry and Technology, Ruđera Boškovića 35, 21 000 Split, Croatia
Abstract
High purity magnesium hydroxide has been synthesised from seawater with the addition of dolomite lime as reagent. High intensity ultrasound-assisted crystallization of magnesium hydroxide was carried out during precipitation with the intention to obtain fine particles of Mg(OH)2 as well as to prevent their agglomeration. Investigations were conducted on magnesium hydroxide samples in the form of sludge and voluminous powder. The composition, morphology, and properties of the product were determined by chemical, XRD, FTIR, and SEM/EDS analysis. The particle size distribution was detected by the laser light scattering method. The results showed that the mean particle size of magnesium hydroxide sludge was 5.75 µm, while voluminous powder was 7.58 µm. The morphology of magnesium hydroxide voluminous powder was in the form of aggregated filamentous (up to 300 nm in size) or flake structures.
This work is licensed under a Creative Commons Attribution 4.0 International License.
Keywords
ultrasound; magnesium hydroxide; seawater; precipitation; particle size; microstructure
Hrčak ID:
243908
URI
Publication date:
24.9.2020.
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