Process for the preparation of fertilizers by the partial solubilization of phosphate rocks

The object of the invention comprises a process for the preparation of fertilizers by solubilizing phosphate rocks containing impurities, which make processing thereof difficult. The process is a simple and direct one. The product thus prepared is easily handled, can be directly used as a powdered f...

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Main Authors MARTINS COSTA; FABIO G, DA SILVA; JAIME C, ABDALLAH-REHIM; HOSAM A, SOARES; GLORIA M. G, CARNEIRO DA SILVA; ALBERTO C, MOREIRA; ELISABETH M
Format Patent
LanguageEnglish
Published 04.02.1986
Edition4
Subjects
CHEMISTRY
FERTILISERS
MANUFACTURE THEREOF
METALLURGY
PHOSPHATIC FERTILISERS
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Summary:The object of the invention comprises a process for the preparation of fertilizers by solubilizing phosphate rocks containing impurities, which make processing thereof difficult. The process is a simple and direct one. The product thus prepared is easily handled, can be directly used as a powdered fertilizer and dispenses with any post-treatment steps, such as purification, filtration, etc. The rock is solubilized with acid ammonium sulfate or a mixture thereof with sulfuric acid. This acid ammonium sulfate can be formed "in situ", by the reaction of ammonium sulfate and sulfuric acid. Reaction may take place in a mixing reactor, on a belt conveyor or in a granulator.
Bibliography:Application Number: US19840639645