Purification of high iron wet-process phosphoric acid via oxalate precipitation method

Abdel-Ghafar, H. M.; Abdel-Aal, E.A.; Ibrahim, Magdy A. M.; El‐Shall, H.; Ismail, Agus

doi:10.1016/j.hydromet.2018.12.011

Cited by 47 publications

(17 citation statements)

References 13 publications

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“…The elution of the sorbent was performed using 0.2 M HCl/0.5 M CaCl 2 solution and the eluate was treated by oxalic acid precipitation at pH 1.1 [58][59][60][61]. The semi-quantitative analysis of desorbed sorbent shows that the desorption yield exceeds 98% for REEs.…”

Section: Elution and Valorizationmentioning

confidence: 99%

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

Wei

Salih

Rabie

et al. 2021

Chemical Engineering Journal

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Alginate-PEI beads are functionalized by phosphorylation and applied for the sorption of Nd(III) and Mo(VI). The successful grafting of phosphoryl groups (as tributyl phosphate derivative) is characterized by FTIR and XPS analysis, elemental analysis, titration (pH PZC ), TGA, BET and SEM-EDX analyses. The multi-functional characteristics of the sorbent (i.e., carboxylic, hydroxyl, amine and phosphate groups) contribute in the binding of metal ions having different physicochemical behaviors. The sorption of Nd(III) is strongly increased by phosphorylation, while for Mo(VI) the enhancement is rather limited. Optimum sorption occurs at pH 3-4: maximum sorption capacity reaches up to 1.46 mmol Nd(III) g − 1 and 2.09 mmol Mo(VI) g − 1 ; sorption isotherms are fitted by the Langmuir equation. The equilibrium is reached within 30-40 min and the kinetic profiles are simulated by the pseudo-first order rate equation. The coefficients of the effective diffusivity are close to the self-diffusivity of Nd(III) and Mo(VI) in water; as a confirmation of the limited impact of resistance to intraparticle diffusion in the kinetic control. The sorbent is selective for Nd(III) over Mo(VI) and other alkali-earth or base metals (at pH close to 2.5-3). Metals can be readily desorbed using 0.2 M HCl/0.5 M CaCl 2 as the eluent. The loss in sorption does not exceed 5% at the fifth cycle, while desorption remains complete. A series of treatments (including acidic leachate, cementation, precipitation, sorption and elution) is successfully applied for the recovery of rare earths from Egyptian ore; with enrichment in the oxalate precipitate of Nd(III), Gd(III), Sm(III) and Eu(III).

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Section: Elution and Valorizationmentioning

confidence: 99%

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

Wei

Salih

Rabie

et al. 2021

Chemical Engineering Journal

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“…Abdel Ghafar et al, [45] reported that the removal of iron from synthetic dilute phosphoric acid (28% P 2 O 5 , 2.8% Fe 2 O 3 , 390 g/L H 3 PO 4 ] similar to that from the dihydrate wet process. The iron was precipitated as ferrous oxalate dihydrate (FeC 2 O 4 .2H 2 O) as its solubility in phosphoric acid is (0.078 g/100 mL) [46].…”

Section: Precipitationmentioning

confidence: 99%

Overview on the removal of iron from phosphoric acid: A Comparative study

Ahmed

2021

Arab Journal of Nuclear Sciences and Applications

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Wet process phosphoric acid (WPA) represents the main route for phosphate fertilizers world ' s production using sulfuric acid as leaching agent. The produced acid is contaminated with various metal ions as iron, aluminum, cadmium, arsenic, uranium, etc. that limit its use in metal finishing, food, cosmetics and electronic industries. Hence, purification of the wet phosphoric acid is a challenge task. The presence of high concentration of iron in phosphoric acid leads to many problems that affect the production process as increasing the viscosity, decreasing the filtration ration rate, formation of precipitates during concentration, clarification and storage, P 2 O 5 loss in addition to decreasing the solubility of fertilizers, The present review gives an overview on the removal of iron from crude phosphoric acid by some commonly used techniques including precipitation, sorption and solvent extraction to evaluate the efficiency and drawbacks of each process. The pre-treatments of phosphoric acid are also discussed.

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“…The ability to recirculate aluminium back to precipitation makes the overall process more cost-efficient at a larger scale. The study of recovering and reusing the precipitation reagents in a process is a step towards circular economy and slowly becoming a more common part of process development (Abdel-Ghafar et al 2019). The obtained results in this work are used as preliminary (1)…”

Section: Introductionmentioning

confidence: 99%

Purification of recovered phosphoric acid by extracting aluminium with di-2-ethylhexyl phosphoric acid

Reuna

Väisänen

2021

Chem. Pap.

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The extraction of aluminium from dilute phosphoric acid with di-2-ethylhexyl phosphoric acid (DEHPA) was optimized using response surface methodology. The optimization was based on the experimental three-level central composite face-centred design (CCF) and was conducted on real-life samples. The three variables included were pH, extractant concentration and aqueous to organic phase ratio (AO). Under the optimized conditions (pH 2.5, 0.6 M DEHPA and AO ratio 1:2), extraction efficiency of 99% for aluminium in four extraction stages is achieved. The purified phosphoric acid solution can then be utilized by the fertilizing industry. Stripping tests for organic phase loaded with aluminium were conducted with sulphuric acid. Extremely high stripping efficiency was obtained with 0.9 M sulphuric acid resulting in the recovery rate of 88% in one stage. After stripping, the aluminium sulphate solution can be reused as a precipitation agent for phosphorus in the wastewater treatment process.

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Purification of high iron wet-process phosphoric acid via oxalate precipitation method

Cited by 47 publications

References 13 publications

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

Development of phosphoryl-functionalized algal-PEI beads for the sorption of Nd(III) and Mo(VI) from aqueous solutions – Application for rare earth recovery from acid leachates

Overview on the removal of iron from phosphoric acid: A Comparative study

Purification of recovered phosphoric acid by extracting aluminium with di-2-ethylhexyl phosphoric acid

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