Synthesis of magnesium aluminate spinel by periclase and alumina chlorination

Highlights: • Use of chlorination for the synthesis of magnesium aluminate spinel. • The reagents used were alumina, periclase and chlorine. • Isothermal and non-isothermal assays were performed in air and Cl{sub 2}–N{sub 2} flows. • The chlorination produced magnesium aluminate spinel at 700 °C. •...

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Bibliographic Details
Published in:Materials research bulletin 2014-11, Vol.59, p.337-340
Main Authors: Orosco, Pablo, Barbosa, Lucía, Ruiz, María del Carmen
Format: Article
Language:English
Subjects:
ALUMINATES
ALUMINIUM OXIDES
CHLORINATION
COMPARATIVE EVALUATIONS
DIFFERENTIAL THERMAL ANALYSIS
FLUORESCENCE
HEAT TREATMENTS
MAGNESIUM OXIDES
MATERIALS SCIENCE
SPINELS
SYNTHESIS
TEMPERATURE DEPENDENCE
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
X-RAY FLUORESCENCE ANALYSIS
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Summary:Highlights: • Use of chlorination for the synthesis of magnesium aluminate spinel. • The reagents used were alumina, periclase and chlorine. • Isothermal and non-isothermal assays were performed in air and Cl{sub 2}–N{sub 2} flows. • The chlorination produced magnesium aluminate spinel at 700 °C. • Selectivity of the chlorination reaction to obtain spinel is very high. - Abstract: A pyrometallurgical route for the synthesis of magnesium aluminate spinel by thermal treatment of a mechanical mixture containing 29 wt% MgO (periclase) and 71 wt% Al{sub 2}O{sub 3} (alumina) in chlorine atmosphere was developed and the results were compared with those obtained by calcining the same mixture of oxides in air atmosphere. Isothermal and non-isothermal assays were performed in an experimental piece of equipment adapted to work in corrosive atmospheres. Both reagents and products were analyzed by differential thermal analysis (DTA), X-ray diffraction (XRD) and X-ray fluorescence (XRF). Thermal treatment in Cl{sub 2} atmosphere of the MgO–Al{sub 2}O{sub 3} mixture produces magnesium aluminate spinel at 700 °C, while in air, magnesium spinel is generated at 930 °C. The synthesis reaction of magnesium aluminate spinel was complete at 800 °C.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2014.07.026