| An attempt has been made to study the effects of pressure
md temperature on spinellisation of magnesium aluminate
aggregate. The starting materials, magnesium hydroxide and
aluminium hydroxide, were first characterized and then
mixed for stoichiometric spinel composition. The mixed
powder was then fired as loose powder and as briquettes
(pressed at 1000 kg.cm-1), between 900" and 1600°C. The
amount of spinellisation has been determined by X-ray
diffraction method after comparing with a standard spinel
sample. The results show that the briquettes have much
higher spinel content and almost complete spinellisation has
been obtained at 1600°C, whereas only 82.5% spinellisation
was observed for the powders at the same temperature.
Densification study of the briquetted samples also supports
the trend of spinellisation. |
