Solvent extraction for cleaning phosphoric acid in fertilizer production

Skorovarov, J.I.; Ruzin, L.I.; Lomonosov, A. V.; Tselitschev, G. K.

doi:10.1007/bf02389457

Cited by 16 publications

(7 citation statements)

References 1 publication

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“…3were all very high confirming that Cd 3 (PO 4 ) 2 formed is unstable and salting out of Cadmium is the net effect as reported in related Cadmium extraction study 27,28 . Comparing results with those reported with buffered aqueous solutions of Cadmium (II) at pH 6.0-8.0 which had percent extraction of Cadmium between 99.4%-99.9% 20 indicated that the acids, anions and complexing agents used for the study did not enhance the extraction of Cadmium at the study pH of 7.5.…”

Section: Resultssupporting

confidence: 68%

Acids and Anions Effects on the Distrubution of Cadmium Between Buffered Aqeuous Phases and 4,4´-(1e,1e´)-1,1´-(Ethane-1,2-Diylbis (Azan-1-Yl-1ylidene)) Bis(5-Methyl-2-Phenyl-2,3-Dihydro-1h-Pyrazol-3-Ol) Solutions

et al. 2019

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The effect of some acids, anions and auxiliary complexing agents on the extraction of Cadmium (II) from aqueous solutions buffered to pH 7.5 using a chloroform solution of the Schiff base ligand 4,4´-(1E,1E´)-1,1´-(ethane-1,2-diylbis(azan-1-yl-1ylidene))bis(5-methyl-2-phenyl-2,3-dihydro-1H-pyrazol-3-ol) (H2BuEtP) alone and in the presence of 1-(3-hydroxy-5-methyl-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl) butan-1-one (HBuP) after an equilibration time of sixty minutes was investigated. Working concentration of Cd(II) was 50mgL-1, while a range from 0.001M-3.0M was used for acid and 0.001M-1.0M for anions and auxiliary complexing agents. Extraction raffinates were analysed for Cd(II) using Flame Atomic Absorption spectrophotometry and Distribution Ratios. Percentage Extractions (%E) were calculated by difference of Cd(II) concentrations before and after equilibration. The mixed ligands H2BuEtP/HBuP organic phase was a better extractant for Cadmium than H2BuEtP alone but the difference was not significant for all acids, Cl-, Oxalate and Tartrate. The results indicated that at lower concentrations of the acids, anions and auxiliary complexing agents, a releasing effect occurred with improved extraction of Cadmium > 90% in most cases and at high concentrations there was reduced percentage extraction due to masking of Cadmium from formation of stable salts of Cadmium. Comparing results with other those of other metals studied under same conditions showed that multi-metal extraction with the ligand (H2BuEtP) is possible. H3PO4, H2SO4, HCl, PO43-, EDTA and Oxalate all showed theoretical potentials for separating Cadmium from other studied metals with Separation Factors βxy = Dx/Dy close to and above 104.

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Section: Resultssupporting

confidence: 68%

Acids and Anions Effects on the Distrubution of Cadmium Between Buffered Aqeuous Phases and 4,4´-(1e,1e´)-1,1´-(Ethane-1,2-Diylbis (Azan-1-Yl-1ylidene)) Bis(5-Methyl-2-Phenyl-2,3-Dihydro-1h-Pyrazol-3-Ol) Solutions

et al. 2019

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“…Various processes have been investigated for the purification of phosphoric acid 2,3 or for cadmium extraction from acidic solutions; 4,5 one of the most promising is liquid/liquid extraction using selected solvent/extractant systems. [2][3][4][5] However, solvent extraction is frequently limited to industrial applications because of several economical, technical, and environmental constraints, including extractant dispersion, loss of solvent, and pollution impact. 6 To improve the applicability of solvent extraction systems, several impregnation techniques have been developed, including resin impregnation, 7,8 the use of liquid membrane systems, 9 and more recently, hollow fiber systems.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Cadmium from Phosphoric Acid Using Resins Impregnated with Organophosphorus Extractants

Hinojosa‐Reyes

Medina

Navarro

et al. 2001

Ind. Eng. Chem. Res.

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In the first part of this work, Amberlite XAD-7, impregnated with Cyanex 301, is selected among several supports and organophosphorus extractants for its high affinity for cadmium in phosphoric acid solutions. Initially, the work focuses on the study of cadmium extraction and stripping, in both batch and column systems, using synthetic solutions. This extraction system can be efficiently used for the recovery of cadmium from concentrated phosphoric acid solutions (up to 12 M). Cadmium can be removed from loaded resins using hydrochloric acid (5 M), and the resin can be reused without additional treatment. The second part of the study focuses on the recovery of cadmium from industrial phosphoric acid solutions. The presence of iron(III) and copper(II) in large concentrations has a significantly negative effect on extraction properties. A pretreatment consisting in the reduction of ferric and cupric ions using Na 2 S 2 O 4 or iron powder was used. The extraction efficiency was thereby increased, but it remained lower than that obtained with synthetic solutions. Recycling was also strongly limited: the presence of other competitor ions can explain this decrease in extraction efficiency.

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“…Previous studies pointed out that one of the best extractant to remove cadmium by solvent extraction was TOA in kerosene. 32,33 Cadmium can form anionic chloro complexes in chloride solutions and they could be separated from the organic phase by contacting with organic anion exchanger such as protonated TOA. It can be confirmed that below 10% of TOA was enough to extract cadmium with efficiency of about 90%.…”

Section: Basic Extractantmentioning

confidence: 99%

Emulsion Liquid Membrane for Cadmium Removal: Determination of Liquid Membrane Components

Kusumastuti¹,

Qudus²,

Anis³

et al. 2018

JPS

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Solvent extraction for cleaning phosphoric acid in fertilizer production

Cited by 16 publications

References 1 publication

Acids and Anions Effects on the Distrubution of Cadmium Between Buffered Aqeuous Phases and 4,4´-(1e,1e´)-1,1´-(Ethane-1,2-Diylbis (Azan-1-Yl-1ylidene)) Bis(5-Methyl-2-Phenyl-2,3-Dihydro-1h-Pyrazol-3-Ol) Solutions

Acids and Anions Effects on the Distrubution of Cadmium Between Buffered Aqeuous Phases and 4,4´-(1e,1e´)-1,1´-(Ethane-1,2-Diylbis (Azan-1-Yl-1ylidene)) Bis(5-Methyl-2-Phenyl-2,3-Dihydro-1h-Pyrazol-3-Ol) Solutions

Extraction of Cadmium from Phosphoric Acid Using Resins Impregnated with Organophosphorus Extractants

Emulsion Liquid Membrane for Cadmium Removal: Determination of Liquid Membrane Components

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