Thermodynamic equilibrium in the system H 2 O+P 2 O 5 +CaCO 3 at 25 and 70 °C: Application for synthesis of calcium phosphate products based on calcium carbonate decomposition

Bakher, Z.; Kaddami, Mohammed

doi:10.1016/j.fluid.2017.10.005

Cited by 11 publications

(3 citation statements)

References 16 publications

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“…The dissolution behavior of Ca(H 2 PO 4 ) 2 in the phosphoric acid system was analyzed using the ternary phase diagram. The ternary phase diagram of CaO–P 2 O 5 –H 2 O at 70 °C was obtained by Bakher et al Points A, B, and C in Figure respectively represent the equilibrium solid phase points of CaHPO 4 ·H 2 O, CaHPO 4 and Ca(H 2 PO 4 ) 2 ·H 2 O, respectively. △ADE is the crystalline region of CaHPO 4 ·H 2 O.…”

Section: Resultsmentioning

confidence: 99%

Study on Controlling the Dissolution of Calcium Dihydrogen Phosphate Using Ternary Phase Diagrams to Improve the Production Process of Phosphoric Acid

Chen

Zheng

Tang

et al. 2022

Ind. Eng. Chem. Res.

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Phosphogypsum is a solid byproduct in the production of phosphoric acid in the traditional sulfuric acid process, and its output has caused a huge economic and environmental burden. In order to avoid the production of phosphogypsum and efficiently produce phosphoric acid, a novel study on the decomposition of phosphate ore by phosphoric acid was carried out. The influence of parameters on the decomposition efficiency of phosphate ore were explored systemically using response surface methodology (RSM). The concentration of phosphoric acid was the most important factor affecting the decomposition efficiency of phosphate ore in the phosphoric acid process, followed by reaction temperature and reaction time. The dissolution behavior of Ca(H 2 PO 4 ) 2 was studied using phase diagrams of ternary systems of P 2 O 5 −CaO−H 2 O. When the ratio of the practical doses of phosphoric acid to the theoretical/ stoichiometric doses of phosphoric acid (Ratio P/T ) was 3.3 and the phosphoric acid concentration (calculated as P 2 O 5 ) was 35%, the decomposition efficiency of phosphate ore reached 98.34%, and the proportion of Ca(H 2 PO 4 ) 2 dissolved in the leach liquor reached 98.54%. A high proportion of dissolved Ca(H 2 PO 4 ) 2 reduced the loss of phosphorus, and the generation of clean gypsum was obtained under these experimental conditions. Clean gypsum produced by the phosphoric acid process is regular long columnar crystal and has few impurities. This study provides an efficient strategy for the production of phosphoric acid by controlling the dissolution of Ca(H 2 PO 4 ) 2 , while avoiding the generation of phosphogypsum.

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Section: Resultsmentioning

confidence: 99%

Study on Controlling the Dissolution of Calcium Dihydrogen Phosphate Using Ternary Phase Diagrams to Improve the Production Process of Phosphoric Acid

Chen

Zheng

Tang

et al. 2022

Ind. Eng. Chem. Res.

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“…In the pharmaceutical field, the purity of the acid used is very high. However, in the field of fertilizer production the purity of phosphoric acid remains limited to 59 weight% in phosphoric acid …”

Section: Introductionmentioning

confidence: 99%

“…However, in the field of fertilizer production 4 the purity of phosphoric acid remains limited to 59 weight% in phosphoric acid. 5 Several processes are available to purify phosphoric acid according to their energy characteristics and technical feasibility. 6 The scientific research already carried out in this domain is directed toward the purification of phosphoric acid by using membranes such as the work of Elleuch et al, 7 or by the crystallization method 8 based on the use of the hemihydrate 2H 3 PO 4 •H 2 O.…”

Section: Introductionmentioning

confidence: 99%

Liquid–Liquid–Solid Equilibria in the Ternary System Water–Phosphoric Acid–Cyclohexane at 25 and 35 °C: Stability Domain of Hemihydrate and Anhydrous Phosphoric Acid

Bakher

Kaddami

2018

J. Chem. Eng. Data

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The water−phosphoric acid−cyclohexane ternary system was studied at 25 and 35 °C under atmospheric pressure, and the binodal curve was determined by the cloud-point method. In addition, the isoplethic section between 2H 3 PO 4 •H 2 O−cyclohexane was investigated using a Tammann diagram based on the thermal analysis of different samples with the determination of hemihydrate melting temperature. The concentration of phosphoric acid and cyclohexane was assayed by volumetric titration and gas chromatography, respectively; the amount of water was calculated by the material balance equation. The miscibility between phosphoric acid and cyclohexane was found to be very low with the appearance of a three-phase stability domain liquid−liquid−solid by the presence of phosphoric acid crystals: hemihydrate (2H 3 PO 4 •H 2 O) and anhydrous phosphoric acid (H 3 PO 4 ).

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Dissolution kinetics of phosphate ore particles in excessive phosphoric acid

Liao

Zhang

et al. 2023

Reac Kinet Mech Cat

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Thermodynamic equilibrium in the system H 2 O+P 2 O 5 +CaCO 3 at 25 and 70 °C: Application for synthesis of calcium phosphate products based on calcium carbonate decomposition

Cited by 11 publications

References 16 publications

Study on Controlling the Dissolution of Calcium Dihydrogen Phosphate Using Ternary Phase Diagrams to Improve the Production Process of Phosphoric Acid

Study on Controlling the Dissolution of Calcium Dihydrogen Phosphate Using Ternary Phase Diagrams to Improve the Production Process of Phosphoric Acid

Liquid–Liquid–Solid Equilibria in the Ternary System Water–Phosphoric Acid–Cyclohexane at 25 and 35 °C: Stability Domain of Hemihydrate and Anhydrous Phosphoric Acid

Dissolution kinetics of phosphate ore particles in excessive phosphoric acid

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