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RESEARCH PRODUCT

A Novel Ionic Exchange Membrane Crystallizer to Recover Magnesium Hydroxide from Seawater and Industrial Brines

Marian TurekAlessandro TamburiniF. VassalloGiorgio MicaleAndrea CipollinaDaniele La Corte

subject

Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi Chimicibrine valorisationInorganic chemistryIonic bondingchemistry.chemical_elementFiltration and Separation02 engineering and technologylcsh:Chemical technologyArticlelaw.inventionmembrane crystallizer020401 chemical engineeringlawChemical Engineering (miscellaneous)lcsh:TP1-1185critical raw materiallcsh:Chemical engineering0204 chemical engineeringCrystallizationwastewaterIon exchangeChemistryMagnesiumProcess Chemistry and Technologylcsh:TP155-156bitternContamination021001 nanoscience & nanotechnology6. Clean waterMembraneBrineSeawater0210 nano-technology

description

A novel technology, the ion exchange membrane crystallizer (CrIEM), that combines reactive and membrane crystallization, was investigated in order to recover high purity magnesium hydroxide from multi-component artificial and natural solutions. In particular, in a CrIEM reactor, the presence of an anion exchange membrane (AEM), which separates two-compartment containing a saline solution and an alkaline solution, allows the passage of hydroxyl ions from the alkaline to the saline solution compartment, where crystallization of magnesium hydroxide occurs, yet avoiding a direct mixing between the solutions feeding the reactor. This enables the use of low-cost reactants (e.g., Ca(OH)2) without the risk of co-precipitation of by-products and contamination of the final crystals. An experimental campaign was carried out treating two types of feed solution, namely: (1) a waste industrial brine from the Bolesław Śmiały coal mine in Łaziska G&oacute

10.3390/membranes10110303http://dx.doi.org/10.3390/membranes10110303