Novel composition for use in agriculture as soil improvers and fertilizers and process for their production
AssigneeSocieta' Italiana Resine S.I.R. S.p.A.
InventorsLuigi Piccolo, Benedetto Calcagno, Marcello Ghirga, Antonio Paolinelli
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Abstract
Novel compositions for use in agriculture as soil improvers and fertilizers comprising as essential components ammonium sulfate and ferric oxide hydrate. By-products obtained in the production of titanium dioxide from ilmenite or ilmenite slag in the sulfate process and substantially consisting of ferrous sulfate heptahydrate are reacted with ammonia and that the reaction product obtained, consisting substantially of ammonium sulfate and ferrous hydrate, is subsequently oxidized until a composition is obtained which substantially consists of ammonium sulfate and ferric oxide hydrate.
Claims9
A process for preparing soil improvers and fertilizers characterized in that the dry by-products obtained in the production of titanium dioxide from ilmenite or ilmenite slag in the sulfate process and which substantially consist of dry ferrous sulfate heptahydrate with minor amounts of the sulfates of magnesium, manganese, calcium, aluminum and titanium are reacted with gaseous ammonia and the reaction product obtained, consisting substantially of ammonium sulfate and ferrous hydrate, is then subsequently oxidized until a composition is obtained which substantially consists of ammonium sulfate and ferric oxide hydrate and then the product consisting substantially of ammonium sulfate and ferric oxide hydrate is treated with sulfuric acid until ferric oxide hydrate has been converted to ferric sulfate to an amount of at least 5 mole percent.
Dependencies are inferred from the claim text.