The intensified leaching behavior of potassium from phosphorus-potassium associated ore in HCl-CaF2 system with surfactant: Part Ⅰ kinetics and modelling

Liu, Cuncheng; Liu, Sucheng; Qin, Yuan-Hang; Ma, Jun; Wu, Zaikun; Zhou, Jin; Lyu, Renliang; Wang, Cunwen

doi:10.1016/j.seppur.2018.11.025

Cited by 24 publications

(9 citation statements)

References 31 publications

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“…4, by graphing ln(r) vs. 1/T, the activation energy for V and Y were estimated to 4.406 kJ mol -1 and 3.6 kJ mol -1 , respectively. The activation energy was less than 25 kJ mol -1 which confirms the diffusioncontrolled reaction rate in the leaching process [33].…”

Section: Thermodynamic Studymentioning

confidence: 54%

Ultrasound‐Assisted Leaching of Vanadium and Yttrium from Coal Ash: Optimization, Kinetic and Thermodynamic Study

2021

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Vanadium (V) and yttrium (Y) were extracted from coal fly ash by a leaching process utilizing sulfuric acid with assistance of ultrasonic and hydrogen peroxide. Response surface methodology was applied to optimize main factors including solid-to-liquid (S/L) ratio, H 2 SO 4 percentage, and H 2 O 2 percentage. Under optimal conditions recovery rates for V and Y were 100 % and 97 %, respectively. A modified shrinking core model to study the kinetic leaching showed that the mass diffusion step controlled the reaction rate. The enthalpies for V and Y recovery indicated that the process was endothermic. Gibbs energy for both metals was negative, i.e., the process was spontaneous. Field emission scanning electron microscopy was applied to determine the effects of acid concentration and ultrasound on the surface of coal fly ash. Results demonstrated that the leaching agent could degrade and diffuse to coal ash particles.

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Section: Thermodynamic Studymentioning

confidence: 54%

Ultrasound‐Assisted Leaching of Vanadium and Yttrium from Coal Ash: Optimization, Kinetic and Thermodynamic Study

2021

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“…The rate of the process would be controlled by the slowest of these sequential steps. The experimental data were applied both to heterogenous and homogenous models to determine kinetics of the dissolution of calcium vanadate . Applied models and obtained regression coefficients are summarized in Table .…”

Section: Resultsmentioning

confidence: 99%

Dissolution kinetics of calcium vanadates in sulfuric acid: a fundamental study for the vanadium extraction process

Huang

Xiang

Wang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: The dissolution behavior of calcium vanadates is vital for the vanadium extraction process, as well as the utilization of calcium vanadates based function materials. Therefore, the dissolution kinetics study of calcium vanadates (CaV 2 O 6 , Ca 2 V 2 O 7 , and Ca 3 V 2 O 8 ) in sulfuric acid are presented. The effects of stirring speed, solid/liquid ratio, pH, and temperature on the dissolution rate of calcium vanadates were determined. The mineralogical and microstructure of the residue after dissolution are also performed. RESULTS:The results showed that the dissolution rate of calcium vanadates significantly increased with the increase of temperature from 30 to 70°C. Under the conditions with solid/liquid ratio of 1:150 g mL −1 , temperature range of 30 to 70°C, and pH of 4, the rate of Ca 3 V 2 O 8 dissolution is the fastest, followed by Ca 2 V 2 O 7 and CaV 2 O 6 , especially at low temperature. CONCLUSION: The mineralogical analyses results showed that the main products for the dissolution of Ca 2 V 2 O 7 and Ca 3 V 2 O 8 are needle-like CaSO 4 ·0.5H 2 O, whereas for CaV 2 O 6 are undissolved CaV 2 O 6 and hydrolyzed V 2 O 5 . The dissolution kinetics indicate that the dissolution of CaV 2 O 6 follows second-order pseudo-homogeneous model, whilst Ca 2 V 2 O 7 and Ca 3 V 2 O 8 follow the diffusion through the product or ash layer model. The apparent activation energies for the dissolution of CaV 2 O 6 , Ca 2 V 2 O 7 , and Ca 3 V 2 O 8 were determined as 46.44, 38.72, and 23.50 kJ mol −1 , respectively.

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“…10 Liu studied the enhancement of the potassium leaching process by surfactants; the potassium leaching rate was increased to 98.01% through the addition of sodium dodecyl sulfate and calcium fluoride in the hydrochloric acid system. 11 Zhou studied the kinetics of potassium and aluminum leaching with the fluoride addition. 12 Li reported the effect of phosphorus−potassium associated ore particle size on the potassium leaching kinetics.…”

Section: Introductionmentioning

confidence: 99%

“…Ma utilized the addition of fluoride to enhance the leaching process of potassium, and a potassium leaching rate of 89.5% was achieved through the addition of calcium fluoride in the hydrochloric acid system . Liu studied the enhancement of the potassium leaching process by surfactants; the potassium leaching rate was increased to 98.01% through the addition of sodium dodecyl sulfate and calcium fluoride in the hydrochloric acid system . Zhou studied the kinetics of potassium and aluminum leaching with the fluoride addition .…”

Section: Introductionmentioning

confidence: 99%

Dissolution Behavior and Kinetics of the Phosphorus–Potassium Associated Ore during Phosphoric Acid Leaching

Ren

Wang

et al. 2022

Ind. Eng. Chem. Res.

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The comprehensive utilization of the phosphorus− potassium associated ore has become significant to the new energy industry in China. This study proposes a new method for utilization of the phosphorus−potassium associated ore by phosphoric acid leaching. The mineral phase of the phosphorus−potassium associated ore was analyzed by X-ray diffraction and mineral liberation analysis. The leaching characteristics, mechanism, and kinetics of phosphorus, potassium, aluminum, magnesium, and iron were systematically investigated. Phosphorus and potassium leaching processes were controlled by the internal diffusion of the shrinking core model with apparent activation energies of 30.43 and 23.81 kJ/mol. The optimized leaching process conditions were as follows: stirring speed of 400 rpm, particle size of 150−300 μm, phosphorus concentration (P 2 O 5 ) of 14%, phosphorus-to-calcium ratio of 9.65, reaction temperature of 40 °C, and reaction time of 60 min. The phosphorus leaching rate was 96.18 ± 0.92%, and the potassium leaching rate was 2.60 ± 0.08%. The acid-insoluble residue was mainly composed of potassium feldspar, indicating that effective separation of phosphorus and potassium was achieved through phosphoric acid leaching.

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The intensified leaching behavior of potassium from phosphorus-potassium associated ore in HCl-CaF2 system with surfactant: Part Ⅰ kinetics and modelling

Cited by 24 publications

References 31 publications

Ultrasound‐Assisted Leaching of Vanadium and Yttrium from Coal Ash: Optimization, Kinetic and Thermodynamic Study

Ultrasound‐Assisted Leaching of Vanadium and Yttrium from Coal Ash: Optimization, Kinetic and Thermodynamic Study

Dissolution kinetics of calcium vanadates in sulfuric acid: a fundamental study for the vanadium extraction process

Dissolution Behavior and Kinetics of the Phosphorus–Potassium Associated Ore during Phosphoric Acid Leaching

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