In {TAIL ~ the process} a slurry of alumina, preferably a microcrystalline boehmite pseudoboehmite intermediate, is prepared in {HEAD ~ an acidic aqueous medium and droplets} of the slurry are passed through air into a column containing an upper body of water immiscible liquid and ammonia and a lower body of aqueous coagulating agent 
In { TAIL ~ the process } a slurry of alumina , preferably a microcrystalline boehmite pseudoboehmite intermediate , is prepared in { HEAD ~ an acidic aqueous medium and droplets } of the slurry are passed through air into a column containing an upper body of water immiscible liquid and ammonia and a lower body of aqueous coagulating agent
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