Flottation ionique du cadmium et de l'arsenic par un dithiophosphate dans les solutions concentrées en acide phosphorique

Bessière, J.; Bruant, M.; Jdid, El-Aïd; Blazy, Pierre

doi:10.1016/0301-7516(86)90075-x

Cited by 17 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several techniques have been studied to extract cadmium from phosphoric acid: liquid-liquid extraction with different solvents, precipitation, adsorption, and others. [13][14][15][16][17][18][19][20][21][22][23][24] In addition to thermal methods, hydrometallurgical methods of cadmium extraction from phosphate ore have been studied. Most of the studies found in the literature recommend the use of organic extractants or acidic substances in high concentrations to extract cadmium from the phosphate matrix, but often these studies overlook an important point, which is the phosphate losses generated by these extraction agents, which, despite their effectiveness, limit their use.…”

Section: Introductionmentioning

confidence: 99%

“…On a lower scale (laboratory or pilot), several studies have been carried out on the decadmiation of phosphoric acid, phosphates, and fertilizers. Several techniques have been studied to extract cadmium from phosphoric acid: liquid‐liquid extraction with different solvents, precipitation, adsorption, and others [13–24] . In addition to thermal methods, hydrometallurgical methods of cadmium extraction from phosphate ore have been studied.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cadmium Removal from Cadmium‐Containing Apatites by Ion‐Exchange Reactions

2022

View full text Add to dashboard Cite

The exchange reaction of cadmium by non-toxic metallic cation ions in a cadmium-containing apatite was studied. A cadmiumcontaining apatite with characteristics close to those of natural phosphate ore was synthesized. Copper and then zinc ions have been found to be the most effective elements for the exchange reaction. After 4 h of treatment at room temperature, 25 % and 14 % of cadmium were removed using 0.1 m solutions of copper and zinc ions, respectively. At 60 °C, cadmium removal efficiency improved considerably. For copper ions, the efficiency reached 53 %, while it arrived at 25 % for zinc ions. The equilibrium study shows that the two reactions are thermodynamically feasible but balanced reactions with little reaction progress for small cadmium content. The reaction can be well modeled by the shrinking-core model and is found to be controlled by the diffusion through the reacted layer.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cadmium Removal from Cadmium‐Containing Apatites by Ion‐Exchange Reactions

2022

View full text Add to dashboard Cite

show abstract

“…Many research techniques have been investigated for removal of cadmium from phosphoric acid, such as precipitation [2][3][4] , ion exchange 5 , solvent extraction [6][7][8] , ionic flotation 9 , membrane processes like electrodialysis, reverse osmosis and nanofiltration [10][11][12] , adsorption on activated carbon [13][14] , crystallization 15 , extraction with chelating or impregnated resins [16][17][18] and concentration or addition of additives 19 . However, the uses of these techniques were limited due to a number of disadvantages such as high costs of organic solvents and resins (more often not regenerable), energy requirements, limited efficacy, the complicated process of treatment and also a risk of secondary pollution.…”

Section: Introductionmentioning

confidence: 99%

Removal of Cd(II) from Phosphoric Acid Solution by Adsorbents: Equilibrium and Kinetic Studies

Omri¹,

Batis²

2013

Chem Sci Trans

View full text Add to dashboard Cite

The phosphoric acid obtained by wet-process is rich in impurities including heavy metals like cadmium. This work deals with the cadmium elimination from acid, by its adsorption on natural or modified clays and activated carbon, to improve its quality. The clays used in this study were effective for cadmium trapping from wet-phosphoric acid since it was reduced to approximately 80%. Moreover, our study shows that the fixation of cadmium is proportional to the temperature which however cannot exceed 313 K. On the other hand, the kinetic data, at the equilibrium, indicated that cadmium is more fixed on the inserted EDTA in the K10 montmorillonite (M). The kinetics of adsorption could be described by two models: pseudo-firstorder and pseudo-second-order, which depend on temperature and the nature of adsorbent. At different temperatures used and with various adsorbents viz., K10 Montmorillonite (M), Gross kaolinite (K), Activated carbon (C), EDTA inserted in K10 montmorillonite (MD), iron oxide inserted in K10 montmorillonite (MF) and Posidonia oceanica impregnated on kaolinite (KP), the pseudo second order model was the most reliable to determine the order of kinetics of adsorption of cadmium, which is also reflected a good correlation coefficient (above 0.97). The experimental equilibrium adsorption data of Cd(II) onto different adsorbents were in agreement with the Freundlich isotherm model.

show abstract

“…Highly acidic media are interesting for both theoretical reasons and practical applications. Surface activity modifications have implications in industrial processes such as ionic flotation (6), corrosion inhibition and phase transfer catalysis. Surfactants are able to promote the transfer of a lipophilic solute from a nonpolar solvent to a polar reaction medium by lowering the interfacial tension and by forming emulsions.…”

Section: Introductionmentioning

confidence: 99%