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613 results on '"Micale G."'

48. Valorization of saltwork brines for the production of acid and base using electrodialysis with bipolar membranes

Author

López J., Filingeri A., León T., Culcasi A., Tamburini A., Micale G., Cortina J. L., Cipollina A., and López J., Filingeri A., León, T., Culcasi, A., Tamburini A., Micale G., Cortina J.L., Cipollina, A.

Subjects
Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi Chimici
Abstract

Valorization of brines, usually considered as wastes, has become an alternative to extract critical and valuable raw materials, but also for energy recovery and generation of reactants. Within this context, the H2020 SEArcularMINE project aims to recover from saltwork brines Mg(II), Li(I) and some trace elements (B(III), Co(II) and Sr(II), among others), all of them listed as critical raw materials by the European Union [1]. Due to the fact that the technologies devoted to the recovery of the above mentioned elements require acid and bases, the SEArcularMINE project aims to produce them in-situ (HCl and NaOH) from exhausted brines (free of Mg(II) and Ca(II)) using Electrodialysis with Bipolar Membranes (EDBM), promoting in this way a fully circular scheme. The aim of this work is to evaluate the performance of a laboratory EDBM unit (equipped with membranes supplied by SUEZ-WTS) for the production of NaOH and HCl, mimicking conditions (in terms of solution composition and flows arrangements) expected within the treatment chain. Moreover, experiments were carried out with real pre-treated brines (Mg(II) and Ca(II) < 10 mg/L), and the transport of the above-mentioned trace elements was studied in detail. All the experiments were performed in a lab-scale unit (Electromat MkI ED STACK) with an active area of 0.028 m2 operated at 300 A/m2. In order to compare experiments, several performance parameters were calculated, such as the specific energy consumption (SEC), current efficiency and acid and base purities. Experimental results showed the possibility of producing NaOH and HCl (>1 M), with SEC values ranging between 2.05 and 2.39 kWh/kg NaOH and current efficiencies higher than 70%.

Published
2022

49. Improving efficiency and discharge power of acid-base flow battery via a bi-objective optimisation

Author

Culcasi A., Gurreri L., Tamburini A., Cipollina A., Bogle I. D. L., Micale G., Culcasi A., Gurreri L., Tamburini A., Cipollina A., Bogle I.D.L., and Micale G.

Subjects
Optimization, Electro-chemical energy storage, Bipolar membrane (reverse) electrodialysi, Flow battery, Renewable Energy, Sustainability and the Environment, Bipolar membrane (reverse) electrodialysis, Energy Engineering and Power Technology, Ion-exchange membrane, Electrical and Electronic Engineering, Electro-chemical energy storage, Ion-exchange membrane, Flow battery, Bipolar membrane (reverse) electrodialysis, Modelling, Optimization, Modelling
Published
2023
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50. Magnesium Hydroxide Nanoparticles Production from Natural Bitterns

Author

Battaglia G., Domina M. A., Romano S., Tamburini A., Cipollina A., Micale G., Battaglia G., Domina M.A., Romano S., Tamburini A., Cipollina A., and Micale G.

Subjects
Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi Chimici, magnesium hydroxide, Bitterns, Nanoparticles
Abstract

Magnesium hydroxide nanoparticles are widely employed in numerous industrial applications. Several preparation methods have been proposed using mainly synthetic Mg2+ containing solutions. In the present work, the possibility of producing Mg(OH)2 nanoparticles from real bitterns, the by-product of sea salt production, is investigated. Bitterns are highly concentrated Mg2+ 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 Mg2+ 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)2 nanoparticles characterized by cationic and mass purity higher than 99 % and 90 %, respectively, were successfully produced when treating Galia bitterns, while the excessive Margi Mg2+ concentration yielded stronger micrometer Mg(OH)2 agglomerates.

Published
2022

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