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4 results for “Magnesium hydroxide”
Evaluation of the Purity of Magnesium Hydroxide Recovered from Saltwork Bitterns
<p>Magnesium has been listed among the 30 critical raw materials by the European Union. In recent years, many green and sustainable alternative Mg<sup>2+</sup> sources have been sought to satisfy the EU’s demand and to avoid mineral ore consumption. In this context, saltwork bitterns, the by-products of solar sea salt production, have attracted much attention thanks to their high Mg<sup>2+</sup> concentrations (up to 80 g/L) and low Ca<sup>2+</sup> and bicarbonate contents (<0.5 g/L). Although investigations on Mg<sup>2+</sup> extraction from bitterns in the form of Mg(OH)<sub>2</sub>(s) have already been performed, product purity has never been properly addressed. Mg(OH)<sub>2</sub>(s) is a chemical compound of great interest and extensive utility in numerous industrial applications only if the powder’s purity is >95% (w/w). This work presents a comprehensive experimental effort of reactive precipitation tests with NaOH solutions at stoichiometric and over-stoichiometric concentrations to: (i) assess the technical feasibility of Mg<sup>2+</sup> recovery from real bitterns collected in saltworks of the Trapani district (Italy) and, (ii) for the first time, conduct an extensive purity investigation of the precipitated magnesium hydroxide powders as brucite. This experimental investigation demonstrates the possibility of extracting highly valuable compounds from saltwork bittern waste, embracing the water valorization and resource recovery approach.</p>
Magnesium Hydroxide Nanoparticles Production from Natural Bitterns
<p>Magnesium hydroxide nanoparticles are widely employed in numerous industrial applications. Several preparation methods have been proposed using mainly synthetic Mg<sup>2+</sup> containing solutions. In the present work, the possibility of producing Mg(OH)<sub>2</sub> nanoparticles from real bitterns, the by-product of sea salt production, is investigated. Bitterns are highly concentrated Mg<sup>2+</sup> containing solutions whose exploitation can turn a waste into valuable products embracing the circular economy idea. Two bitterns collected from Galia and Margi saltworks of the district of Trapani (Italy) were studied. Galia and Margi bitterns had a 1 M and 2.5 M Mg<sup>2+</sup> concentration, respectively. A 2 mm diameter circular-cross sectional T-mixer was adopted to ensure fast reactant mixing. NaOH solutions were employed as precipitant agents. Mg(OH)<sub>2</sub> nanoparticles characterized by cationic and mass purity higher than 99 % and 90 %, respectively, were successfully produced when treating Galia bitterns, while the excessive Margi Mg<sup>2+</sup> concentration yielded stronger micrometer Mg(OH)<sub>2</sub> agglomerates.</p>
The Role of Operating Conditions in the Precipitation of Magnesium Hydroxide Hexagonal Platelets Using NaOH Solutions
<p>Magnesium hydroxide, Mg(OH)<sub>2</sub>, is an inorganic compound extensively employed in several industrial sectors. Nowadays, it is mostly produced from magnesium-rich minerals. Nevertheless, magnesium-rich solutions, such as natural and industrial brines, could prove to be a great treasure. In this work, synthetic magnesium chloride and sodium hydroxide, NaOH, solutions were used to recover Mg(OH)<sub>2</sub> by reactive crystallization. A detailed experimental campaign was conducted aiming at producing grown Mg(OH)<sub>2</sub> hexagonal platelets. Experiments were carried out in a stirred tank crystallizer operated in single- and double-feed configurations. In the single-feed configuration, globular and nano-flakes primary particles were obtained, as always reported in the literature when NaOH is used as a precipitant. However, these products are not complying with flame retardant applications that require large hexagonal Mg(OH)<sub>2</sub> platelets. This work suggests an effective precipitation strategy to favour crystal growth while, at the same time, limiting nucleation mechanism. The double-feed configuration allowed the synthesis of grown Mg(OH)<sub>2</sub> hexagonal platelets. The influence of reactants flow rates, reactants concentrations and reaction temperature was analyzed. SEM pictures were also taken to investigate the morphology of Mg(OH)<sub>2</sub> crystals. The proposed precipitation strategy paves the road to satisfy flame retardant market requirements.</p>
Pharmacokinetics of Granule and Tablet Formulations of Deferitazole (Disodium Salt) and a Capsule Formulation of Deferitazole (Magnesium Hydroxide Salt)
ClinicalTrials.gov study NCT02065401. IPD Sharing: Not stated. Countries: 1. Publications: 0.
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