Isolation and identification of microorganisms causing microbial degradation of organic phase of the solvent extraction unit in the copper industries

2012 ◽  
Vol 112-113 ◽  
pp. 43-48 ◽  
Author(s):  
Z. Manafi ◽  
H. Abdollahi ◽  
M. Zolfagari Majd ◽  
N. Golbang ◽  
G. Emtiazi ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Organic Phase ◽  
Microbial Degradation ◽  
Isolation And Identification ◽  
Extraction Unit

scholarly journals Study on the Effect and Mechanism of Impurity Aluminum on the Solvent Extraction of Rare Earth Elements (Nd, Pr, La) by P204-P350 in Chloride Solution

Minerals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 61
Author(s):  
Wenjie Zhang ◽  
Xian Xie ◽  
Xiong Tong ◽  
Yunpeng Du ◽  
Qiang Song ◽  
...  
Keyword(s):  
Rare Earth ◽  
Solvent Extraction ◽  
Rare Earth Elements ◽  
Organic Phase ◽  
Extraction Process ◽  
Industrial Applications ◽  
Separation And Purification ◽  
Aluminum Ion ◽  
Hydrochloric Acid Medium ◽  
Impurity Ion

Solvent extraction is the most widely used method for separation and purification of rare earth elements, and organic extractants such as di(2-ethylhexyl) phosphoric acid (P204) and di(1-methyl-heptyl) methyl phosphonate (P350) are most commonly used for industrial applications. However, the presence of impurity ions in the feed liquid during extraction can easily emulsify the extractant and affect the quality of rare earth products. Aluminum ion is the most common impurity ion in the feed liquid, and it is an important cause of emulsification of the extractant. In this study, the influence of aluminum ion was investigated on the extraction of light rare earth elements by the P204-P350 system in hydrochloric acid medium. The results show that Al3+ competes with light rare earths in the extraction process, reducing the overall extraction rate. In addition, the Al3+ stripping rate is low and there is continuous accumulation of Al3+ in the organic phase during the stripping process, affecting the extraction efficiency and even causing emulsification. The slope method and infrared detection were utilized to explore the formation of an extraction compound of Al3+ and the extractant P204-P350 that entered the organic phase as AlCl[(HA)2]2P350(o).

Solvent extraction studies of the system 64Cu/Htta/topo and the role of the metal complexes involved

1970 ◽  
Vol 23 (12) ◽  
pp. 2413
Author(s):  
EB Jacobs ◽  
WR Walker
Keyword(s):  
Solvent Extraction ◽  
Metal Complexes ◽  
Organic Phase ◽  
Ternary Complex ◽  
Equilibrium Constants ◽  
Synergistic Extraction ◽  
Back Extraction

Solvent extraction studies have been carried out on the system Cu/Htta/topo (Htta = thenoyltrifluoroacetone; topo = tri-n-octylphosphine oxide) with benzene as the organic phase. Using 64Cu as a tracer, equilibrium constants have been evaluated and compared with data obtained from the back-extraction of the labelled ternary complex 64Cu(tta)2(topo). The solubilities of binary and secondary complexes that are involved in synergistic extraction have also been measured.

The supramolecular speciation: a key for improved understanding and modelling of chemical reactivity in complex systems

2003 ◽  
Vol 91 (11) ◽  
Author(s):  
Gérard Cote
Keyword(s):  
Organic Matter ◽  
Solvent Extraction ◽  
Complex Systems ◽  
Organic Phase ◽  
Chemical Reactivity ◽  
Liquid Systems ◽  
Mass Transfers ◽  
Rapid Mass

AbstractThe objective of this paper is to show through various examples that the "supramolecular" speciation is a key for the understanding and modelling of phenomena as varied as unusually rapid mass transfers in solvent extraction, organic phase splitting in liquid-liquid systems and complex behaviours of the organic matter in the environment.

LUBRICATING OILS SOLVENT EXTRACTION IN A REFLUX EXTRACTION UNIT

1936 ◽  
Vol 28 (9) ◽  
pp. 1035-1037 ◽  
Author(s):  
M. R. Cannon ◽  
M. R. Fenske
Keyword(s):  
Solvent Extraction ◽  
Lubricating Oils ◽  
Extraction Unit

scholarly journals Reimagining Third Phase Formation as the Miscibility Gap of a Molecular Solution

2019 ◽  
Author(s):  
Michael Servis ◽  
David T. Wu ◽  
Jenife Shafer ◽  
Aurora Clark
Keyword(s):  
Solvent Extraction ◽  
Phase Formation ◽  
Organic Phase ◽  
Coexistence Curve ◽  
Phase Region ◽  
Dynamics Simulation ◽  
Miscibility Gap ◽  
Acid Extraction ◽  
Third Phase ◽  
Third Phase Formation

Liquid/liquid phase transitions are inherent to multicomponent solutions, which often contain a diversity of intermolecular interactions between their molecular constituents. In one such example, a phase transition is observed in liquid/liquid extraction where the nonpolar organic phase separates into two phases under sufficiently high metal and acid extraction by the amphiphilic extractant molecule. This deleterious phenomenon, known as third phase formation, complicates processing and limits efficiency. While empirically well documented, the molecular origin of this phenomenon is not understood. The prevailing conceptualization of the organic phase treats it as a microemulsion where extractant molecules form reverse micelles that contain the extracted aqueous solutes in their polar cores. Yet recent studies indicate that a microemulsion paradigm is insufficient to describe molecular aggregation in some solvent extraction systems, implying that an alternative description of aggregation, and explanation for third phase formation, is needed. In this study, we demonstrate that the formation of a third phase is consistent with crossing the liquid-liquid miscibility gap for a molecular solution rather than a Winsor II to Winsor III transition as presumed in the microemulsion paradigm. This insight is provided by using a graph theoretic methodology, generalizable to other complex multicomponent molecular solutions, to identify the onset of phase splitting. This approach uses connectivity obtained from molecular dynamics simulation to correlate the molecular-scale association of extractants and extracted solutes to the solution phase behavior using percolation theory. The method is applied to investigate a solvent extraction system relevant to ore purification and used nuclear fuel recycling: tri-n-butyl phosphate/uranyl nitrate/water/nitric acid/n-dodecane. In analogy to a molecular solution, immediately preceding the liquid-liquid coexistence curve from the single phase region, the metal-ligand complexes percolate. This demonstrates that describing this solution with microemulsion chemistry is neither applicable nor broadly required to explain third phase formation. Additionally, the method developed herein can predict third phase formation phase boundaries from simulation for this and potentially other solvent extraction systems.

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