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Abstract
This paper explores the possibility of manoeuvring the reactivity of boehmite through mechanical activation (MA) for enhancing the solid/liquid reaction between boehmite and NaOH. Synthetic boehmite, prepared by thermal dehydroxylation of gibbsite, used in this study has been characterised by a large specific surface area (~264m2/g). A planetary mill has been used for MA. Boehmite dissolution during caustic leaching (temperature: 70–90°C, Na2O concentration: 180g/l) has been found to increase with the extent of MA. Energy accumulated in the solid (boehmite) structure makes its dissolution in aqueous phase easy. Significantly high dissolution (~23g of boehmite in 210ml of 180g/l Na2O solution) has been achieved at atmospheric pressure condition (90°C) for 240min milled sample. Kinetic analysis of the leaching data of boehmite milled for different durations (up to 240min) has shown that the value of apparent activation energy for boehmite dissolution decreases with the extent of MA. Analysis of the results shows that MA has larger influence on dissolution than rise in leaching temperature. An attempt has been made to separate the effect MA from that of surface area.
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