Open AccessPhosphogypsum Conversion into Calcium Fluoride and Sodium Sulfate
Author(s) -
Yassine Ennaciri,
Mohammed Bettach,
Hanan El Alaoui-Belghiti
Publication year - 2020
Publication title -
annales de chimie, science des matériaux/annales de chimie
Language(s) - English
Resource type - Journals
eISSN - 1958-5934
pISSN - 0151-9107
DOI - 10.18280/acsm.440606
Subject(s) - phosphogypsum , phosphoric acid , fluorine , raw material , waste management , fluoride , environmental science , pulp and paper industry , chemistry , materials science , inorganic chemistry , metallurgy , organic chemistry , engineering
The phosphoric acid production in the world generates a large amount of phosphogypsum beside the emission of toxic acid fluorine gas into the atmosphere, which can cause a several environmental problems. To remedying these problems, an environmental procedure permit recycling phosphogypsum waste by NaF into valuable products, was presented in this work. According the obtained results, the proposed process is feasible and leads preparing a relatively pure CaF2 and Na2SO4. This last is recommended in detergent and glass industry, while the resulting CaF2 can be utilized in metallurgical industry. The optimum conversion conditions were achieved with the exact stoichiometric phosphogypsum and NaF at reaction duration of 90 minutes under room temperature.