Petroleo Brasileiro S.a. - Petrobras

Alberto C Carneiro Da Silva

Jaime Correia Da Silva

Gloria M Soares

Hosam A Abdallah-Rehim

Fabio G Martins Costa

Elisabeth M Moreira

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.

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Niteroi, Brazil

Alberto C Carneiro Da Silva