STUDY OF SOME PARAMETERS TO OBTAIN THE P 2 O 5 WATER- SOLUBLE FROM PARTIALLY ACIDULATED PHOSPHATE ROCKS (PAPRs) BY SULFURIC ACID

The work presented in this paper deals with the determination of optimum parameters during the partial acidulation of the phosphate ore of Djebel Onk (Algeria) and the determination of P2O5 water-soluble. The first part is devoted to P2O5 conversion rate during partial acidulation of phosphate with different particle sizes (80 μm, 160 μm and 250 μm). These conversion rates are obtained by performing a series of reactions between phosphate and sulfuric acid diluted from 10 to 50 wt% and with reaction times ranging from 10 to 50 minutes. The best conversion rate (38.78%) was obtained at a reaction time of 50 minutes with phosphate particle size of 80 μm and an acid concentration of 50 wt%. The second part, concerns the measurement of P2O5water-soluble of phosphate partially acidulated (PAPRs) with 40% and 50 wt% sulfuric acid. The percentage of P2O5 soluble in water has reached 14.98% for PAPRs obtained with phosphate particle size of 80 μm and an acid of 50 wt%. (Received January 31, 2012; Accepted April 8, 2012)