Abstract: | Influence of Mechanical Activation on Thermal Decomposition of Gibbsite The influence of mechanical activation on structure and reactivity of gibbsite in dependence on stress mechanism (pressure stress and shearing in vibration-mills, shock stress in disintegrators) is investigated. With increasing mechanical treatment the degree of order is decreased. Mechanically disturbed gibbsite shows changed decomposition series. After mechanical activation and short-time heating there are formed nearly X-ray amorphous Al2O3 with high spec. surfaces. It is possible to transform these alumina into pseudo-boehmite with a very low alkali content. The transformation into pseudo-boehmite is dependent on the degree of order of the mechanically pretreated gibbsite and is independent of the spec. surface of X-ray amorphous Al2O3. The products can be used for the preparation of adsorbents and catalyser components. |