TRAITEMENT DU PHOSPHATE NATUREL DE LA TAPOA (NIGER) PAR DES ACIDESMINERAUX ET ORGANIQUES

This study propose away for the development of hardly soluble natural phosphate. Thusitwascarried out, the dissolution of natural phosphate from Tapoa (Niger) in solutions of mineralacids (nitricacid and sulfuricacid) and in solutions of organicacids (citricacid and ethylene diamine tetraacetic EDTA) in function of pH and attack time. The resultsobtainedshowedthat the maximum rate of dissolvedphosphorus as a percentage of phosphoric anhydride (P₂O₅) is 14.08% and 15.99% respectively in solutions of nitricacid and sulfuricacid at the concentration of after 7 hours of attack. In organicacid solutions, the dissolution rate is 4.67% and 5.17% respectively in citricacid and EDTA solutions at the same concentration. In addition, the dissolution rate decreaseswhen the acid concentration decreaseswhileit tends to increasewith the attack duration regardless of the acid solution used (mineral or organic). Also, this dissolution rate isalmostzero in solutions of organicacidswhen the concentrationis .