Effect of Different Kinetic Factors on the Thermochemistry of Sulfophosphoric Attack Reaction of Natural Phosphate Tunisian by DRC - Advances in Materials Physics and Chemistry

AMPC > Vol.8 No.11, November 2018

Effect of Different Kinetic Factors on the Thermochemistry of Sulfophosphoric Attack Reaction of Natural Phosphate Tunisian by DRC ()

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DOI: 10.4236/ampc.2018.811029 758 Downloads 1,587 Views Citations

Author(s)

Olfa Lachkar-Zamouri¹, Khemaies Brahim¹, Faten Bennour², Ismail Khattech¹

Affiliation(s)

¹Chemistry Department: LR15ES01 Materials, Cristallochemistry and Applied Thermodynamics Laboratory, Faculty of Science, Tunis El Manar University, Tunis, Tunisia.
²Direction of Scientific Research, Tunisian Chemical Group, Sfax, Tunisia.

ABSTRACT

Mixture of phosphoric and sulfuric acid solutions has been used to investigate the dissolution of natural phosphates (PN) by DRC. The effect of concentration, particle size and stirring speed reaction is examined. Thermochimique properties of each kinetic parameters reaction are determined. It was found that these parameters have a considerable effect on the thermochemical aspect of the attack reaction. It is known that the process of PN sulphophosphoric acid attack leads to the formation of dihydrate (CaSO_4.2H₂O: DH). The present work shows the precipitation of other residues their formula depends on factors studied. The increase in concentration leads to the formation of hemihydrate (CaSO₄v1/2H₂O:HH) beside DH for the low values of% H₂SO₄ due to the solubility of dihydrate on the etching solution and the precipitation of (Ca (H₂PO₄)_2.2H₂O) next of DH for low agitation values because of the lack of turbulence between the liquid phase and the solid phase which favors the precipitation of this latter compound.

KEYWORDS

Thermochimique, Phosphate Ore, Differential Reaction Calorimetry, Concentration, String Speed, Particle Size

Share and Cite:

Lachkar-Zamouri, O. , Brahim, K. , Bennour, F. and Khattech, I. (2018) Effect of Different Kinetic Factors on the Thermochemistry of Sulfophosphoric Attack Reaction of Natural Phosphate Tunisian by DRC. Advances in Materials Physics and Chemistry, 8, 429-440. doi: 10.4236/ampc.2018.811029.

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