An Improved process for the preparation of high pure Iron oxide of ferrite Grade

摘要

An improved process for the preparation of high-pure iron oxide of ferrite grade by treating the complex iron solution with air-ammonia mixture to effect copre-cipitation of impurities with hydrated iron(III) oxide, filtering and pressing the residue to expel the mother liquor, treating the filtrate along with the recovered mother liquor with hydrated yellow iron(III) oxide, filtering and pressing the residue to expel the mother liquor, repeating the above treatment successively, as required, treating the resultant filtrate with hydroxy-lamine hydrochloride, passing mixture of air and ammonia to precipitate iron oxide, filtering and washing the precipitate with demineralised water containing hydroxylamine hydrochloride, followed by drying, roasting and powdering of the roasted precipitate to obtain high-pure iron oxide.