Preparation of very light boehmite from hydrothermally supersaturated sodium aluminate solutions with boehmite seed

Very light boehmite from supersaturated sodium aluminate(SA) solutions was reported by a hydrothermal precipitation process with boehmite seed,which came from the hydrothermal homogeneous precipitation between aluminum sulfate and urea.Precipitation conditions of single-phase boehmite with very light tape density and their effects on crystal structures and morphologies were studied by ICP-AES,XRD and SEM.It was determined that very light single-phase boehmite can be obtained by precipitation 48h at 100℃ or precipitation 3h at 187℃,but precipitation conditions had not marked effects on foregoing properties of the products.The very light boehmite seed precipitation process not only enrichs the traditional gibbsite seed precipitation process,but also provides a preparation method of very light boehmite.