Dissolution of Tunisian phosphate ore by a mixture of sulfuric and phosphoric acid: Kinetics study by means of differential reaction calorimetry
A mixture of phosphoric and sulfuric acid was used to investigate the dissolution kinetics of phosphate ore by Differential Reaction Calorimetry (DRC). The effect of the solid-to-iquid ratio, concentration, stirring speed, particle size and temperature of the reaction is examined. It was established...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2019-01-01
|
| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2019/1450-53391900013L.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832572105462382592 |
|---|---|
| author | Lachkar-Zamouri Olfa Brahim Khemaies Bennour Faten Khattech Ismail |
| author_facet | Lachkar-Zamouri Olfa Brahim Khemaies Bennour Faten Khattech Ismail |
| author_sort | Lachkar-Zamouri Olfa |
| collection | DOAJ |
| description | A mixture of phosphoric and sulfuric acid was used to investigate the dissolution kinetics of phosphate ore by Differential Reaction Calorimetry (DRC). The effect of the solid-to-iquid ratio, concentration, stirring speed, particle size and temperature of the reaction is examined. It was established that the dissolution rate increased with stirring speed and particle size. However, rising the olid-to-iquid ratio, temperature and concentration decreased the dissolution rate. It was determined that the dissolution rate fits in the first order of the pseudo-homogeneous reaction model. Two negative values of apparent activation energies were found in the range of 25 to 60°C. The experimental data were tested by graphical and statistical methods and it was found that the following models were best fitted for the experimental data and an empirical equation for the process was developed. -ln (1 – x) = [2,2 E-09((S/L)0.75C -0.461G0.447(SS) 0.471exp (2671/T)]t. T≤ 40°C -ln (1 – x) = [2,2 E-09((S/L)0.75C -0.461G0.447(SS) 0.471exp (6959/T)]t. T > 45°C |
| format | Article |
| id | doaj-art-e90efa8b87f04983aba9d6f03754fc4a |
| institution | Kabale University |
| issn | 1450-5339 2217-7175 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | University of Belgrade, Technical Faculty, Bor |
| record_format | Article |
| series | Journal of Mining and Metallurgy. Section B: Metallurgy |
| spelling | doaj-art-e90efa8b87f04983aba9d6f03754fc4a2025-02-02T11:57:40ZengUniversity of Belgrade, Technical Faculty, BorJournal of Mining and Metallurgy. Section B: Metallurgy1450-53392217-71752019-01-0155191910.2298/JMMB180808013L1450-53391900013LDissolution of Tunisian phosphate ore by a mixture of sulfuric and phosphoric acid: Kinetics study by means of differential reaction calorimetryLachkar-Zamouri Olfa0Brahim Khemaies1Bennour Faten2Khattech Ismail3Tunis El Manar University, Faculty of Science, Chemistry Department: LRES Materials, Cristallochemistry and Applied Thermodynamics Laboratory, Tunis, TunisiaTunis El Manar University, Faculty of Science, Chemistry Department: LRES Materials, Cristallochemistry and Applied Thermodynamics Laboratory, Tunis, TunisiaDirection of Scientific Research, Tunisian Chemical Group, Sfax, TunisiaTunis El Manar University, Faculty of Science, Chemistry Department: LRES Materials, Cristallochemistry and Applied Thermodynamics Laboratory, Tunis,TunisiaA mixture of phosphoric and sulfuric acid was used to investigate the dissolution kinetics of phosphate ore by Differential Reaction Calorimetry (DRC). The effect of the solid-to-iquid ratio, concentration, stirring speed, particle size and temperature of the reaction is examined. It was established that the dissolution rate increased with stirring speed and particle size. However, rising the olid-to-iquid ratio, temperature and concentration decreased the dissolution rate. It was determined that the dissolution rate fits in the first order of the pseudo-homogeneous reaction model. Two negative values of apparent activation energies were found in the range of 25 to 60°C. The experimental data were tested by graphical and statistical methods and it was found that the following models were best fitted for the experimental data and an empirical equation for the process was developed. -ln (1 – x) = [2,2 E-09((S/L)0.75C -0.461G0.447(SS) 0.471exp (2671/T)]t. T≤ 40°C -ln (1 – x) = [2,2 E-09((S/L)0.75C -0.461G0.447(SS) 0.471exp (6959/T)]t. T > 45°Chttp://www.doiserbia.nb.rs/img/doi/1450-5339/2019/1450-53391900013L.pdfkineticsphosphate oresdifferential reaction calorimetryshrinking-core modelactivation energyisoconversional model |
| spellingShingle | Lachkar-Zamouri Olfa Brahim Khemaies Bennour Faten Khattech Ismail Dissolution of Tunisian phosphate ore by a mixture of sulfuric and phosphoric acid: Kinetics study by means of differential reaction calorimetry Journal of Mining and Metallurgy. Section B: Metallurgy kinetics phosphate ores differential reaction calorimetry shrinking-core model activation energy isoconversional model |
| title | Dissolution of Tunisian phosphate ore by a mixture of sulfuric and phosphoric acid: Kinetics study by means of differential reaction calorimetry |
| title_full | Dissolution of Tunisian phosphate ore by a mixture of sulfuric and phosphoric acid: Kinetics study by means of differential reaction calorimetry |
| title_fullStr | Dissolution of Tunisian phosphate ore by a mixture of sulfuric and phosphoric acid: Kinetics study by means of differential reaction calorimetry |
| title_full_unstemmed | Dissolution of Tunisian phosphate ore by a mixture of sulfuric and phosphoric acid: Kinetics study by means of differential reaction calorimetry |
| title_short | Dissolution of Tunisian phosphate ore by a mixture of sulfuric and phosphoric acid: Kinetics study by means of differential reaction calorimetry |
| title_sort | dissolution of tunisian phosphate ore by a mixture of sulfuric and phosphoric acid kinetics study by means of differential reaction calorimetry |
| topic | kinetics phosphate ores differential reaction calorimetry shrinking-core model activation energy isoconversional model |
| url | http://www.doiserbia.nb.rs/img/doi/1450-5339/2019/1450-53391900013L.pdf |
| work_keys_str_mv | AT lachkarzamouriolfa dissolutionoftunisianphosphateorebyamixtureofsulfuricandphosphoricacidkineticsstudybymeansofdifferentialreactioncalorimetry AT brahimkhemaies dissolutionoftunisianphosphateorebyamixtureofsulfuricandphosphoricacidkineticsstudybymeansofdifferentialreactioncalorimetry AT bennourfaten dissolutionoftunisianphosphateorebyamixtureofsulfuricandphosphoricacidkineticsstudybymeansofdifferentialreactioncalorimetry AT khattechismail dissolutionoftunisianphosphateorebyamixtureofsulfuricandphosphoricacidkineticsstudybymeansofdifferentialreactioncalorimetry |