Preparation and crystallization kinetics of micron-sized Mg(OH)2 in a mixed suspension mixed product removal crystallizer

Song, Xingfu; Tong, Kefeng; Sun, Su-Qin; Sun, Ze; Yu, Jianguo

doi:10.1007/s11705-013-1332-7

Cited by 25 publications

(13 citation statements)

References 32 publications

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“…These, in fact, indicate a typical size distribution of Mg(OH) 2 crystals up to few microns [15,[20][21][22]. Moreover, the apparent increase in particle size while increasing reactant concentration is opposite to the usual dependence of nucleation and growth kinetics with super-saturation.…”

Section: Semi-batch Experimentsmentioning

confidence: 91%

“…Through an in-depth analysis of process performance dependences on operating conditions, the optimal ones were identified in order to achieve Mg(OH) 2 crystals with spherical shape, purity higher than 99% and an average particle sizes distribution ranging from 6 to 30 μm. More recently, the same authors [22] performed experiments in a continuous Mixed Suspension Mixed Product Removal crystalliser. Also, in this case, the main identified drawback was that Mg(OH) 2 nanoparticles can easily aggregate forming gelatinous precipitates, which create filtration difficulties, as already underlined by some of the previous works.…”

Section: Introductionmentioning

confidence: 99%

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Reactive crystallisation process for magnesium recovery from concentrated brines

Cipollina

Bevacqua

Dolcimascolo

et al. 2014

Desalination and Water Treatment

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Seawater brines, generated either by natural or anthropic processes, often cause significant environmental issues related to their disposal. A clear example is the case of brines from desalination plants, which can have severe environmental impacts on the receiving water body. On the other side, brines can represent a rich and appealing source of raw materials, especially when they are very concentrated, as it happens with bitterns (i.e. exhausted brines) produced in saltworks. In particular, magnesium concentration can reach values up to 30-40 kg/m3 of brine, which is 20-30 times that of typical seawater.\ud An experimental campaign has been carried out in the present work for assessing the potentials for magnesium recovery from concentrated brines. Real brines were collected from the final basins of the saltworks operating in the district of Trapani (Sicily - Italy).\ud Experiments were performed both in a semi-batch and in a continuous 5 litre crystalliser operating by a reactive precipitation process. NaOH solutions were adopted as standard alkaline reactant in order to assess the influence of all operating parameters and reactor configuration on the recovery efficiency and purity of the Mg(OH)2 powder produced.\ud Results have highlighted a very promising strategy for the recovery of Mg from concentrated brines, which could be scaled-up and applied to a number of different scenarios, including existing saltworks and newly designed integrated cycles for Zero Liquid Discharge desalination

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Section: Semi-batch Experimentsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Reactive crystallisation process for magnesium recovery from concentrated brines

Cipollina

Bevacqua

Dolcimascolo

et al. 2014

Desalination and Water Treatment

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“…Many studies reported the possibility of recovering magnesium, in the hydroxide form, from a saline solution by reactive crystallization [ 27 , 28 , 29 , 30 , 31 , 32 ], via a precipitation process driven by the addition of an alkaline reactant:

…”

Section: Introductionmentioning

confidence: 99%

“…Many studies proved the feasibility to recover magnesium from anthropogenic brine, natural brine and seawater. Lime, slaked lime, ammonia and sodium hydroxide are the mostly used reactants [ 27 , 28 , 29 , 30 , 31 , 32 ]. Lime and slaked lime are the cheapest reactants used in different processes to recover magnesium from saline solution.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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 Górne (Poland) and (2) Mediterranean seawater, collected from the North Sicilian coast (Italy). The CrIEM was tested in a feed and bleed modality in order to operate in a continuous mode. The Mg2+ concentration in the feed solutions ranges from 0.7 to 3.2 g/L. Magnesium recovery efficiencies from 89 up to 100% were reached, while magnesium hydroxide purity between 94% and 98.8% was obtained.

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“…The production of magnesium hydroxide from seawater involves the chemical reaction between magnesium ions from seawater with dolomite lime. This method is the most economical for continuous industrial production with simple process and low energy consumption [16].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of PLA composites with modified magnesium hydroxide obtained from seawater

Jozić

Jakić

et al. 2020

J Therm Anal Calorim

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Modification of poly(lactic acid) (PLA) was performed with the surface modified magnesium hydroxide (mMH) obtained from seawater. Surface modification of MH with different amount of stearic acid (SA) results in chemically bonded SA, stearate as confirmed by Fourier transform infrared spectroscopy (FT-IR). Based on FT-IR and X-ray diffraction (XRD) analysis modified filler with a higher amount of SA was used for the composite preparation. PLA/m10MH composites were prepared using laboratory mixing extruder. Differential scanning calorimetry (DSC) was applied to study thermal properties and crystallinity of PLA/mMH composites, while the thermal stability was performed by thermogravimetric analysis (TG). According to DSC analysis, PLA crystallization is primary influenced by the filler. PLA/m10MH composites degrade in four degradation stages. With an increase of m10MH content in the composites, their thermal degradation becomes more complex and their thermal stability is getting worse. XRD and X-ray microcomputed tomography (XμCT), used to obtain structural and microstructural information about PLA/m10MH composites, revealed that addition of m10MH decreases the crystallinity of PLA, increases the porosity of the composite and produces agglomeration of mMH.

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Preparation and crystallization kinetics of micron-sized Mg(OH)2 in a mixed suspension mixed product removal crystallizer

Cited by 25 publications

References 32 publications

Reactive crystallisation process for magnesium recovery from concentrated brines

Reactive crystallisation process for magnesium recovery from concentrated brines

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

Preparation and characterization of PLA composites with modified magnesium hydroxide obtained from seawater

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