Petroleo Brasileiro S.a. - Petrobras

Gloria M Soares

Wagner C Coelho

Hossam A Abdel-Hehim

Jaime Correia Da Silva

Elisabeth M Moreira

Hosam A Abdallah-Rehim

Fabio G Martins Costa

Alberto C Carneiro Da Silva

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.

Process for the preparation of fertilizers by the partial solubilization

A rapid, low temperature process for solubilizing phosphate rocks having high content of foreign matter or a low phosphorus content to obtain: (a) a slow release fertilizer of the NP type; (b) phosphoric acid of high concentration plus MAP; and (c) DAP.

Process for the partial solubilization of phosphate rock and obtaining

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Rio de Janeiro, Brazil

Gloria M Soares