Phosphoric acid production by attacking phosphate rock with recycled hexafluosilicic acid

摘要

During the classical production of phosphoric acid, the reaction between sulfuric acid and phosphate rock generates suspension. The latter is subsequently filtered and concentrated by evaporation process resulting in fluorine or acid gas. In this paper, we present a new procedure of phosphoric acid production by using recycled hexafluosilicic acid instead of sulfuric acid.