scholarly journals Solvent Extraction of Metal Ions from Sulfate Solutions Obtained in Leaching of Spent Ni-MH Batteries

2019 ◽  
Vol 2 (2) ◽  
pp. 214-221 ◽  
Author(s):  
Beata Pospiech ◽  
Jerzy Gega
Keyword(s):  
Solvent Extraction ◽  
Metal Ions ◽  
Phosphinic Acid ◽  
Nickel Metal ◽  
Nickel Metal Hydride ◽  
Separation Of Metal Ions ◽  
Cyanex 272 ◽  
Initial Ph ◽  
Cyphos Il 104 ◽  
Sulfuric Acid Solutions

Abstract The nickel metal hydride batteries (Ni-MH) are used in many electronic equipment, like cell phones, computers, cameras as well as hybrid cars. Spent batteries can be a rich source of many metals, especially rare earth elements (REE), such as lanthanum (La), cerium (Ce), neodymium (Nd), praseodymium (Pr), samarium (Sm), gadolinium (Gd). Ni-MH batteries also contain iron (Fe) as well as non-ferrous metals, i.e. nickel (Ni), cobalt (Co), zinc (Zn), manganese (Mn), etc. Leaching of such waste with sulfuric acid solutions is one among many methods recovering of useful metals in hydrometallurgical processes. The main aim of this work was separation of metal ions from pregnant leach liquor (PLL) by solvent extraction using phosphorous compounds and ionic liquids (ILs). The initial pH of the aqueous solution was 0.1. Di (2-ethylhexyl) phosphoric acid (D2EHPA), bis (2,2,4-trimethylpentyl) phosphinic acid (Cyanex 272), and phosphoniumionic liquid – trihexyl (tetradecyl) phosphonium bis (2,4,4-trimethylpentyl) phosphinate (Cyphos IL 104) were used as the selective extractants. The initial concentration of the extractants in an organic phase was equal to 0.1 mol∙dm−3. The obtained results show that the highest extraction efficiency was obtained for Fe(III) and Zn(II) in extraction experiments with 0.1 M D2EHPA at pH of 0.1. Ni(II), Co(II) and REE remained in the aqueous solutions. In the next stage, REE were extracted with the mixture of 0.1 M Cyanex 272 and 0.1 M Cyphos IL 104 at pH equal to 3.8. Finally, Ni(II) and Co(II) ions were efficiently removed from the aqueous phase using 0.1 M solution of Cyphos IL 104 at pH around 5.4.

scholarly journals Highly efficient separation of rare earths from nickel and cobalt by solvent extraction with the ionic liquid trihexyl(tetradecyl)phosphonium nitrate: a process relevant to the recycling of rare earths from permanent magnets and nickel metal hydride batteries

2014 ◽  
Vol 16 (3) ◽  
pp. 1594-1606 ◽  
Author(s):  
Tom Vander Hoogerstraete ◽  
Koen Binnemans
Keyword(s):  
Ionic Liquid ◽  
Solvent Extraction ◽  
Rare Earths ◽  
Metal Hydride ◽  
Permanent Magnets ◽  
Nickel Metal ◽  
Nickel Metal Hydride ◽  
Efficient Separation ◽  
Highly Efficient

The undiluted ionic liquid trihexyl(tetradecyl)phosphonium nitrate was used for cobalt–samarium and nickel–lanthanum separations by solvent extraction.

scholarly journals A Process for the Separation of Noble Metals from HCl Liquor Containing Gold(III), Palladium(II), Platinum(IV), Rhodium(III), and Iridium(IV) by Solvent Extraction

Processes ◽  
2019 ◽  
Vol 7 (5) ◽  
pp. 243 ◽  
Author(s):  
Wei Dong Xing ◽  
Man Seung Lee
Keyword(s):  
Solvent Extraction ◽  
Metal Ions ◽  
Noble Metals ◽  
The Other ◽  
Secondary Resources ◽  
Cyanex 272 ◽  
Leaching Solution ◽  
Hcl Concentration ◽  
Hcl Solution ◽  
Excellent Chemical

The demand for noble metals is increasing, owing to their excellent chemical and physical properties. In order to meet the demand, the recovery of noble metals with high purity from diverse secondary resources, which contain small amounts of noble metals, is of immense value. In this work, the possibility of the separation of Au(III), Pd(II), Pt(IV), Rh(III), and Ir(IV) by solvent extraction from a synthetic HCl solution is investigated. Only Au(III) was selectively extracted by Cyanex 272 in the HCl concentration range from 0.5 M to 9 M, leaving the other metal ions in the raffinate. The loaded Au(III) in Cyanex 272 was efficiently stripped by (NH2)2CS. The other four noble metals were sequentially separated on the basis of the procedures reported in the previous work. The mass balance showed that about 98% of each metal, except Pt(IV), was recovered by the proposed process. An efficient process for the recovery of the five noble metal ions from the HCl leaching solution of secondary resources containing these metals can be developed.

scholarly journals Application of Plasticized Cellulose Triacetate Membranes for Recovery and Separation of Cerium(III) and Lanthanum(III)

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Beata Pospiech ◽  
Adam Makowka
Keyword(s):  
Metal Ions ◽  
Phosphinic Acid ◽  
Cellulose Triacetate ◽  
Inclusion Membrane ◽  
Polymer Inclusion Membrane ◽  
Cyanex 272 ◽  
Dithiophosphinic Acid ◽  
Cyanex 301 ◽  
Source Phase

Abstract This work explains the application of plasticized cellulose triacetate (CTA) membranes with Cyanex 272 di(2,4,4-(trimethylpentyl)phosphinic acid) and Cyanex 301 (di(2,4,4-trimethylpentyl)dithiophosphinic acid) as the ion carriers of lanthanum(III) and cerium(III). CTA is used as a support for the preparation of polymer inclusion membrane (PIM). This membrane separates the aqueous source phase containing metal ions and the receiving phase. 1M H2SO4 is applied as the receiving phase in this process. The separation properties of the plasticized membranes with Cyanex 272 and Cyanex 301 are compared. The results show that the transport of cerium(III) through PIM with Cyanex 272 is more efficient and selective than lanthanum(III).

Effect of Doped Metal Ions on the Electrochemical Performance of Nickel Hydroxide Electrode for Nickel/Metal Hydride Battery

2013 ◽  
Vol 448-453 ◽  
pp. 2942-2945
Author(s):  
Xiao Rui Gao ◽  
Kang Le Jiang ◽  
Yu Qiao Wang ◽  
Yong Jing Hao
Keyword(s):  
Metal Ions ◽  
Metal Hydride ◽  
Nickel Hydroxide ◽  
Electrochemical Performances ◽  
Nickel Metal ◽  
Exchange Method ◽  
Nickel Metal Hydride ◽  
Proton Diffusion ◽  
Nickel Metal Hydride Battery ◽  
Hydride Battery

Positive materials for nickel/metal hydride battery, nickel hydroxide doped by different metal ions were synthesized by coprecipitation, and subsequent hydrothermal treatment and anion exchange method. The structure of the samples was analyzed by XRD test, and the electrochemical performances were studied by galvanostatic charge-discharge, cyclic voltammetry and impedance tests. The obtained electrode material shows mainly β-Ni (OH)2structure when only doping Zn2+, while α-Ni (OH)2structure was obtained by only doping Al3+or co-doping Al3+and Zn2+. Ni (OH)2co-doped Al3+and Zn2+had fine cyclic stability, high number of exchanged electrons per nickel atom (the maximum is 1.93), small charge-transfer and proton-diffusion resistances.

Effect of pKa on the extraction behavior of Am(III) in organo phosphorus acid and diglycolamide solvent system

2018 ◽  
Vol 106 (2) ◽  
pp. 107-118 ◽  
Author(s):  
K. Rama Swami ◽  
R. Kumaresan ◽  
P. K. Nayak ◽  
K. A. Venkatesan ◽  
M. P. Antony
Keyword(s):  
Nitric Acid ◽  
Metal Ions ◽  
Phosphinic Acid ◽  
Liquid Waste ◽  
High Level Liquid Waste ◽  
Single Cycle ◽  
Cyanex 272 ◽  
Extraction Behavior ◽  
Trivalent Actinides ◽  
High Level

AbstractA combination of neutral and acidic extractant has been proposed for the single-cycle separation of trivalent actinides from high-level liquid waste (HLLW). The nature of acidic extractant in the combined solvent formulation plays a profound role in deciding the extraction and stripping of trivalent actinides. Therefore, the extraction behavior of Am(III) in a solution of tetra-bis(2-ethylhexyl)-diglycolamide (TEHDGA) and acidic extractant (HA) was studied from nitric acid medium. The acidic extractants chosen were bis(2-ethylhexyl)phosphoric acid (HDEHP), bis(2-ethylhexyl)phosphonic acid (PC88A) and bis(2,4,4-trimethylpentyl)phosphinic acid (CYANEX-272) whose pKavalues were 3.24, 4.51 and 6.37, respectively. The distribution ratio of Am(III) was measured as a function of various parameters such as concentration of nitric acid, TEHDGA, HA etc. The data were compared with those obtained in individual solvent systems namely 0.1 M TEHDGA/n-DD and HA/n-DD. Slope analysis of the extraction data indicated the synergic participation of both TEHDGA and HDEHP in the extraction of Am(III) at all acidities. However, antagonistic effect was observed at lower acidity when TEHDGA was mixed to PC88A or CYANEX-272 present inn-DD. Accordingly, a suitable mechanism has been proposed for the extraction of Am(III) at all acidities using these combined solvent formulation. Studies with fast reactor simulated high level liquid waste indicated that extraction of Am(III) was accompanied by co-extraction of lanthanides and unwanted metal ions such as Zr(IV), Mo(VI), Y(III) and Pd(II). However, addition of trans-1,2-diaminocyclohexane-N,N,N,N′-tetraaceticacid (CyDTA) reduced the extraction of unwanted metal ions. Batch extraction and stripping studies indicated the possibility of using 0.1 M TEHDGA+0.25 M HDEHP inn-dodecane for the single cycle separation of Am(III) from FR-SHLLW.

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