The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 04, 1986
Filed:
Aug. 10, 1984
Alberto C Carneiro da Silva, Niteroi, BR;
Fabio G Martins Costa, Icarai-Niteroi, BR;
Hosam A Abdallah-Rehim, Rio de Janeiro, BR;
Elisabeth M Moreira, Rio de Janeiro, BR;
Gloria M Soares, Rio de Janeiro, BR;
Jaime C da Silva, Rio de Janeiro, BR;
Abstract
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.