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The energetic contribution of various phenomena involved in the reaction between the Tunisia phosphate ore and a mixture of phosphoric and sulfuric acids was studied calorimetrically. The enthalpies of the sulfuric acid ionization (), the H 2 PO 4−  neutralization (), and the phosphate ore dissolution in phosphoric acid alone () or in the mixture of the latter with sulfuric acid () were determined and equal to −58.7 ± 0.7 kJ mol −1 , 12.7 ± 1.3 kJ mol −1 H 2 SO 4 , −186.2 ± 2.2 J g −1  and – 425.6 ± 3.3 J g −1 , respectively. The addition time of the sulfuric acid was systematically investigated to reduce the loss of P 2 O 5  in gypsum and the optimal condition for a better yield was deduced.

journal of the chinese institute of engineers

Sulfo-phosphoric attack of the phosphate ore: energetic contribution of each phenomenon intervening during the attack and effect of the time of addition of the sulfuric acid