Obtaining magnesium hydroxide of micro- or nanostructure on the basis of technical raw materials
1
Cracow University of Technology, Kraków, Poland
2
Mineral and Energy Economy Research Institute of the Polish Academy of Sciences, Kraków, Poland
Gospodarka Surowcami Mineralnymi – Mineral Resources Management 2014;30(4):133-141
KEYWORDS
ABSTRACT
This paper presents the initial results of efforts to obtain high-purity magnesium hydroxide with micro or nano-structure from technical raw materials. Magnesium hydroxide can be used in the plastic industry as a flame retardant additive. Mg(OH)2 should be characterized by high surface area (above 100 m2/g), high disintegration, and high purity. In the research, technical magnesium sulfate was used which was purified by hydrolytic methods before obtaining the magnesium hydroxide. Heptahydrate, the specific raw material for magnesium hydroxide synthesis, was crystallized from purified solutions. The study was conducted for magnesium sulfate concentration in an interval of 0.2–2.0 mol/dm3 and a sodium hydroxide interval of 0.4–0.5 mol/dm3. The precipitate was analyzed by the SEM method and BET, and its purity was tested using the colorimetric technique.
METADATA IN OTHER LANGUAGES:
Polish
Otrzymywanie wodorotlenku magnezu o mikro- i nanostrukturze na bazie technicznych związków magnezu
wodorotlenek magnezu, mikrostruktura, nanostruktura, uniepalniacz
W pracy przedstawiono wstępne wyniki otrzymywania wodorotlenku magnezu o wysokiej czystości i mikro- lub nanostrukturze na bazie surowców technicznych. Wodorotlenek magnezu może znaleźć potencjalne zastosowanie w przemyśle tworzyw sztucznych jako dodatek opóźniający zapłon. Musi cechować się wysoką powierzchnią właściwą (powyżej 100 m2/g), silnym rozdrobnieniem oraz wysoką czystością. W badaniach stosowano techniczny siarczan magnezu, który przed procesem otrzymywania wodorotlenku magnezu oczyszczano z zastosowaniem metod hydrolitycznych. Z oczyszczonych roztworów krystalizowano sól siedmiowodną, która była surowcem do otrzymywania wodorotlenku magnezu. Badania prowadzono dla różnych stężeń siarczanu magnezu 0,2–2,0 mol/dm3, jako czynnik strącający stosowano wodorotlenek sodu w przedziale stężeń 0,4–0,5 mol/dm3. Otrzymany osad analizowano przy użyciu technik SEM oraz BET, czystość określano technikami kolorymetrycznymi.
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| eISSN: | 2299-2324 |
| ISSN: | 0860-0953 |
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