@article{MAKHILLJEAS20072612767,
    title = {Comparative Study of the Dissolution of Phosphate Rock of Djebel Onk (Algeria) by the Nitric Acid and the Sulphuric Acid},
    journal = {Journal of Engineering and Applied Sciences},
    volume = {2},
    number = {6},
    pages = {1016-1019},
    year = {2007},
    issn = {1816-949x},
    doi = {jeasci.2007.1016.1019},
    url = {https://makhillpublications.co/view-article.php?issn=1816-949x&doi=jeasci.2007.1016.1019},
    author = {Abbes Mizane and},
    keywords = {Phosphate rock,dissolution,sulfuric acid,nitric acid,conversion rate,nitrophosphate},
    abstract = {The experiments which we carried out will inform us about the conditions of a better decomposition of phosphate of  Djebel Onk (Algeria). The purpose of this study is to compare the convertion rates of the P<SUB>2</SUB>O<SUB>5</SUB> of  rock  phosphate  obtained  by nitric attack and sulphuric attack. The reactions are carried out by varying the reaction  time  from   3-90  min,  the  temperature    from   20-90&deg;C  and  the  granulometry  of  phosphate  of  500-40 µm. A series of rock phosphate samples was attacked by the 2 acids and the P<SUB>2</SUB>O<SUB>5</SUB> was dosed by gravimetry.  We  noted that the reaction is very fast since at the end of 3 min only, we obtained a convertion rate of P<SUB>2</SUB>O<SUB>5</SUB> higher than 60%. A maximum convertion rate of  96.54% was obtained by the sulphuric attack  in the  following  conditions:  Temperature = 50&deg;C,  Reaction time = 60 min, Granulometry of phosphate = 50 µm. The convertion rate starts to decrease at a temperature higher than 60&deg;C for the nitric attack and at a temperature higher than 50&deg;C for the sulphuric attack. We also deduced that a phosphate granulometry ranging between 80 and 40 µm gives a better dissolution.}
    }