INVESTIGATION OF THERMAL TRANSFORMATIONS IN ALUMINUM HYDROXIDES SUBJECTED TO MECHANICAL TREATMENT

The influence of the mechanical activation of hydrargillite Al(OH)(3) on the mechanism of its thermal dehydration and crystallization in res ponse to treatment with steam was studied. The effects of grinding on the texture, structure and thermal behavior were examined by means of XRD, DTA, TG, DSC, IR spectroscopy and SEM. The mechanical activation of hydrargillite leads to formation of the amorphous state, and also r esults in a change in the thermal dehydration mechanism in the dynamic mode in the air, with a decrease in the Delta H value of dehydration. The transition of hydrargillite into corundum on treatment with steam is facilitated after mechanical activation. The activated state of hy drargillite was found to be unstable and its reactivity decreases as t ime elapses.