Assertion: nitric acid's density | /r/CapableOf | comprise precipitating hydrated alumina
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text: A method of producing alumina suitable for use in fluid catalyst materials having high density and good attrition resistance which comprises precipitating a hydrated alumina from an aqueous solution of a water-soluble alkali metal aluminum compound by admixture therewith of a neutralizing agent selected from the group consisting of alum and a mineral acid, at a pH of from 8 to 10, ageing said precipitate at a pH of from 6.5 to 11 for at least 0.25 hour, filtering and washing said hydrated alumina free from contaminating salts, adding an inorganic acid selected from the group consisting of nitric acid and hydrochloric acid to said final filter cake hydrated alumina, said acid being added thereto in relative amounts of from 0.1 to about 0.4 mole per mole of alumina as A1 0 densifying said acid containing hydrated alumina so that upon drying it will have a density above 0.8 cc. per gram by homogenizing to an extent corresponding to that obtained by passing said alumina through a homogenizing valve at a pressure drop from about 300 to about 3000 p.s.i. and spraying the resulting product into a current of hot gases.