期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2017
卷号：8
期号：1
页码：338-344
出版社：University of Mohammed Premier Oujda
摘要：In phosphoric acid factories using phosphate rock, the major problem known is the highquantity of produced phosphogypsum “PG” waste. Storage and management of thisquantity present a serious problem. The consumption or the re-use of this waste generatesseveral environmental risks due to its composition. Several valorization processes of thePG, economic and environmental, are in phase of development and study. Among thetests of valorization, we can find methods of desulphurization, bacteriological or thermal,allowing to produce sulphur dioxide SO2 used in the synthesis of the sulphuric acid. Theobject of our work is to develop an alternative technique to valorize the PG and producesulphur dioxide “SO2” following an attack by a strong acid in the presence of a metalcatalyst. We have shown that the leaching of the PG with acid alone does not allowreduction of the ions sulphates dissolved to the SO2. However, if the leaching is made inthe presence of the metal elements, the release of gaseous SO2 is observed. The values ofΔGr and ΔHr calculated allowed us to discuss the possibility of the reactions involved andto argument the experimental results found.
