Design of reactors for leaching phosphatic ore
Keywords:phosphatic ore, reactors design
Phosphoric acid is a product of extreme importance to society, where it is integrated into the food, agricultural, pharmaceutical, and chemical markets. Its acquisition is made from phosphate rocks, which through the leaching step of phosphorus by sulfuric acid, being the solvent, forms H3PO4 and CaSO4. This study aims to present a methodology for reactor design for phosphoric acid, with leaching of phosphate ores, using P2O5 conversion equations and adjusting the Michaelis-Menten model. The type of reactor designed for the process was the CSTR, where it is possible to achieve the conversion goal of 98.5 – 99.5% P2O5, taking into account that the material inside the reactor renews itself four times and the residence time that was specified through modeling, finding a residence time of 4 hours. The initial considerations show that the Michaelis-Menten model fits well for the CSTR reactor design, and that the applied methodology is consistent and brings a wealth of information regarding the behavior of the fluid inside the reactor.
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