Naslov
Effect of surfactant addition on precipitation of magnesium oxide from sea bittern

Autori
Jakić, Jelena ; Labor, Miroslav ; Grgičević, Marija ; Martinac, Vanja ; Čović, Anđela

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts of the 28th Croatian meeting of Chemists and Chemical Engineers / Rogošić, Marko - Zagreb : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI), 2023, 154-154

Skup
28th Croatian meeting of Chemists and Chemical Engineers

Mjesto i datum
Rovinj, Hrvatska, 28.03.2023. - 31.03.2023

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
sea bittern, precipitation of magnesium oxide, poly(vinyl-alcohol)

Sažetak
The sea bittern produced in large quantities during the extraction of sea salt is a source for the extraction of valuable minerals. Various methods have been used to extract the valuable mineral, especially Mg(OH)2. Magnesium concentration can reach values of up to 30-40 kg/m3 of sea bittern, which is 20-30 times that of typical seawater. In this study, saturated limestone water was added to a sea bittern solution to obtain a magnesium hydroxide precipitate. Magnesium oxide was produced by calcination at 950 oC/5 h. The aim of this research is to investigate the effect of the surfactant poly(vinyl-alcohol) on the particle size and morphological properties of the obtained magnesium oxide. In the synthesis of magnesium oxide, poly(vinyl-alcohol) was added as a surfactant to prevent agglomeration and affect particle size during synthesis. Poly(vinyl-alcohol) was added in a mass ratio of (1:4) and (1:5) in relation to the mass of magnesium hydroxide obtained by the precipitation process. A characterization of the MgO obtained under these conditions was carried out on the basis of chemical composition, thermogravimetric analysis (TG/DTG), transmission electron microscopy (TEM) and determination of particle size distribution. The obtained results showed a positive influence of the addition of surfactant, as the microstructure of all samples is uniform and spherical, the particle size is reduced and the accumulation of particles is prevented. However, the formation of agglomerates is not completely prevented. The resulting agglomerates are smaller, due to the smaller particles formed by the presence of poly(vinyl-alcohol) during synthesis. With increasing addition of poly(vinyl-alcohol), the particle size of the resulting magnesium oxide precipitate decreased and agglomerates with an average particle size of 1034.18 nm are obtained.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

Napomena
This research has been supported by the Croatian Academy of Sciences and Arts (CASA)
under the project "Utilization of mineral resources of seawater bittern by further technological processing".

POVEZANOST RADA