Recovery of magnesium by membrane crystallization with ion-exchange hollow-fibres

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F28676092%3A_____%2F19%3AN0000096" target="_blank" >RIV/28676092:_____/19:N0000096 - isvavai.cz</a>

Result on the web

<a href="http://www.czemp.cz/cs/workshop-students-presentation-fulltexts/wsp-2019-fulltexty" target="_blank" >http://www.czemp.cz/cs/workshop-students-presentation-fulltexts/wsp-2019-fulltexty</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Recovery of magnesium by membrane crystallization with ion-exchange hollow-fibres

Original language description

Most of desalination plants are based on reverse osmosis process, which produces drinking water and concentrated solution of various salts. Brine disposal is linked with environmental difficulties. If extraction of minerals dissolved in these solutions in valuable form was possible, not only environmental cost for their disposal could decrease, but so financial cost could decrease. One of options how to achieve this is membrane crystallization. In this study, such promising process was applied in experiments to obtain Mg(OH)2 from solutions of MgCl2 and NaOH, flowing on the opposite sides of the anion-exchange hollow-fibres. Expected advantages of membrane crystallization have been confirmed. Conversion and formation density of product in hollow-fibres highly exceeded possibilities of flat-sheet ion-exchange membranes. Another set of experiments confirmed better control over the crystallization process by modifying the flow rates and the concentrations of used solutions. To evaluate feasibility of this process in desalination plants, artificial brine solutions have been prepared and used as source of Mg2+ – purity of crystals obtained from brine solutions were different, depending on the brine solution composition. Brine with low amount of Ca2+ proved to be more usable, with purity of synthesised crystals above 98.6%, which confirms high economic potential of process, as the price per ton of Mg(OH)2 highly depends on its purity. The most significant drawback of this process is formation of crystals on the hollow-fibres surface – in the experiments glass beads were used as abrasive, with partial success. The amount of Mg(OH)2 in the solution was 1.5 times higher than in experiments without the glass beads.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20402 - Chemical process engineering

Project

<a href="/en/project/LO1418" target="_blank" >LO1418: Progressive development of the Membrane Innovation Centre</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Workshop of Students´ Presentations 2019

ISBN

978-80-906831-9-8

ISSN

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e-ISSN

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Number of pages

2

Pages from-to

12-13

Publisher name

Czech Membrane Platform

Place of publication

Česká Lípa

Event location

Stráž pod Ralskem

Event date

Oct 16, 2020

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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