method of recovery of fluorine is produced during the production of phosphoric acid by wet process production of phosphoric acid by the fluorine, and amorphous silica

摘要

the centre for studies and research of mineral phosphate group ocp process recovery of fluorine is produced during the production of phosphoric acid by wet process, for the production of phosphoric acid and fluorine and silica, amorphous phosphate at low tempu00e9rat digestion o,the diluted phosphoric acid (15% and 27% p2o5) followed by an attack by the hydrofluosilicic acid is used to produce phosphoric acid, fluorine, and amorphous silica. the slurry produced in the invention is centrifuged to separate the phases.the phosphoric acid produced at concentrations above 27% p2o5 is concentrated to give a concentrated acid p2o5 or used as such for the production of fertilizer, or used as a vector of fluorine to a unit to attack by sulfuric acid to produce acid acid rhydrique and phosphoric acid, concentrated to more than 42% p2o5.amorphous silica is produced completely reactive tank is introduced, preferably in the attack of phosphate with sulphuric acid. the introduction of this silica improves performance of the conventional units, reduces the rate of fluoride released at the unit level, and reduces the corrosion attack filtration equipment in hf.background: patent cites 1313379 08 / 1919 heckenbleikner 2636806 05 / 1950, 2094282 09 / 1982 radheshyam vyas et al 4557915 nineuil 5180569 01 / 10 / 1985 1993 erickson et al. 5427757 06 / 1995 (erickson et al. 5531975 07 / 1996 erickson et al.