Membrane crystallization of magnesium hydroxide

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F28676092%3A_____%2F18%3AN0000070" target="_blank" >RIV/28676092:_____/18:N0000070 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.czemp.cz/cs/protected-node?destination=node/1795&back=http%253A%252F%252Fwww.czemp.cz%252Fcs&protected_page=1795" target="_blank" >http://www.czemp.cz/cs/protected-node?destination=node/1795&back=http%253A%252F%252Fwww.czemp.cz%252Fcs&protected_page=1795</a>

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Membrane crystallization of magnesium hydroxide

Popis výsledku v původním jazyce

Magnesium hydroxide is usually precipitated from brines. In most cases, brine is obtained from desalinating of seawater. However, conventional methods do not often provide high purity of desired product and there are problems with separation of Mg(OH)2. The solution for this problem can be membrane crystallization. There are only few articles published on this topic so far that indicates there are many challenges in investigation of this process. In this work, we focused on exploring the possibilities of membrane crystallization. We mostly used water solutions of MgCl2 and NaOH for experiments. We did several experiments in beaker in order to determine the best conditions for membrane separation (terminal pH 10, temperature 25 °C, concentrations of reactants 0.5 mol l-1 MgCl2 and 0.5 mol l-1 NaOH). Then we used membrane module with hollow fibres, made from heterogeneous anion exchange membrane. For membrane crystallization we used counter-current flow in batch set. When we compared results from beaker experiments and membrane crystallization, there were many differences. Yields of magnesium were higher for beaker reaction, however, in case of membrane crystallization, crystal particles were bigger and had higher purity but the filterability did not improve significantly. SEM pictures of crystals of Mg(OH)2 from beaker reaction showed presence of NaCl impurities.

Název v anglickém jazyce

Membrane crystallization of magnesium hydroxide

Popis výsledku anglicky

Magnesium hydroxide is usually precipitated from brines. In most cases, brine is obtained from desalinating of seawater. However, conventional methods do not often provide high purity of desired product and there are problems with separation of Mg(OH)2. The solution for this problem can be membrane crystallization. There are only few articles published on this topic so far that indicates there are many challenges in investigation of this process. In this work, we focused on exploring the possibilities of membrane crystallization. We mostly used water solutions of MgCl2 and NaOH for experiments. We did several experiments in beaker in order to determine the best conditions for membrane separation (terminal pH 10, temperature 25 °C, concentrations of reactants 0.5 mol l-1 MgCl2 and 0.5 mol l-1 NaOH). Then we used membrane module with hollow fibres, made from heterogeneous anion exchange membrane. For membrane crystallization we used counter-current flow in batch set. When we compared results from beaker experiments and membrane crystallization, there were many differences. Yields of magnesium were higher for beaker reaction, however, in case of membrane crystallization, crystal particles were bigger and had higher purity but the filterability did not improve significantly. SEM pictures of crystals of Mg(OH)2 from beaker reaction showed presence of NaCl impurities.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10406 - Analytical chemistry

Projekt

<a href="/cs/project/LO1418" target="_blank" >LO1418: Progresivní rozvoj Membránového inovačního centra</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název statě ve sborníku

Workshop of Students´ Presentations 2018

ISBN

978-80-906831-3-6

ISSN

—

e-ISSN

—

Počet stran výsledku

11

Strana od-do

41-41

Název nakladatele

Czech Membrane Platform

Místo vydání

Česká Lípa

Místo konání akce

Česká Lípa

Datum konání akce

24. 10. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—