Extraction of Complexes of Some Metals with 1,1-Disubstituted 3-Diphenoxythiophosphorylthioureas

1993 ◽  
Vol 58 (4) ◽  
pp. 798-805 ◽  
Author(s):  
Oldřich Navrátil ◽  
Eckhard Herrmann ◽  
Nguyen Thi Thu Chau ◽  
Channy Tea ◽  
Jiří Smola
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Organic Phase ◽  
Extraction Process ◽  
Radiotracer Technique ◽  
Extraction Constants

The extraction of complexes of silver, mercury, cadmium, cobalt, zinc, scandium and some rare earth elements (Ln) into benzene solutions of 1,1-disubstituted 3-diphenoxythiophosphorylthioureas (HA) containing alkyl and aryl substituents was examined using the radiotracer technique. The complexes AgA(HA), HgA2, CdA2 and LnA3 are extracted into the organic phase, and the extraction increases in order Co, Zn, Cd ≈ Ln << Hg < Ag. The extraction constants were calculated. During the extraction process using medium acidic aqueous phases (1 M HNO3), the reagents decompose into the corresponding amines and (PhO)2P(S)NCS.

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).

scholarly journals Penentuan Kondisi Optimum Proses Ekstraksi Uranium dan Torium dari Terak II Timah dengan Metode Pelindian Asam Sulfat dan Solvent Extraction Trioctylamine (TOA)

EKSPLORIUM ◽  
2019 ◽  
Vol 40 (1) ◽  
pp. 11
Author(s):  
Mutia Anggraini ◽  
Fuad Wafa Nawawi ◽  
Kurnia Setiawan Widana
Keyword(s):  
Rare Earth ◽  
Solvent Extraction ◽  
Rare Earth Elements ◽  
Organic Phase ◽  
Mixing Time ◽  
Economic Value ◽  
Extraction Process ◽  
Radioactive Elements ◽  
Tin Slag ◽  
Slag Processing

ABSTRAKTerak II timah merupakan produk hasil samping dari peleburan timah tahap kedua. Terak II timah ini mengandung unsur bernilai ekonomi tinggi berupa unsur radioaktif (uranium dan torium) dan logam tanah jarang (rare earth element). Unsur-unsur tersebut dapat dimanfaatkan apabila telah terpisah satu dengan lainnya. Proses pemisahan unsur radioaktif dan unsur logam tanah jarang telah dilakukan dengan metode pelindian asam sulfat. Hasil proses ini adalah endapan yang mengandung logam tanah jarang dan filtrat yang mengandung unsur radioaktif berupa uranium dan torium sulfat. Penelitian terkait pemisahan uranium dan torium hasil pengolahan terak II timah hanya sedikit dipublikasikan. Paper ini bertujuan untuk mengetahui efektifitas proses pemisahan uranium dan torium dengan metode solvent extraction menggunakan trioctylamine (TOA). Proses solvent extraction dilakukan dengan memvariasikan konsentrasi TOA yang digunakan, perbandingan fase aqueous dan fase organik (A/O) dan variasi waktu ekstraksi. Pada penelitian ini diperoleh kondisi optimum proses yaitu konsentrasi TOA 4%, perbandingan A/O 1 : 1, dan waktu pencampuran aqueous dan organik selama 2 menit. Pada kondisi ini uranium dan torium yang terekstrak masing-masing sebanyak 67% dan 0,84%. ABSTRACTTin slag II is a by-product of the second stage of tin smelting. The tin slag II contains high economic value elements in the form of radioactive elements (uranium and thorium) and rare earth elements. These elements can be utilized if they are separated from each other. The process of separating radioactive elements and rare earth elements has been carried out by leaching sulfuric acid method. The results of this process are residue containing rare earth elements and filtrates containing radioactive elements in the form of uranium and thorium sulfate. Research related to the separation of uranium and thorium sulfate in tin slag processing is only slightly published. This paper aims to determine the effectiveness of the uranium and thorium separating process by the solvent extraction method using trioctylamine (TOA). The solvent extraction process is carried out by varying the concentration of TOA used, comparison of the aqueous and organic phase (A/O) and variations in extraction time. In this study, the optimum conditions for the process were obtained at 4% of TOA concentration, 1 : 1 of A/O ratio, and mixing time of aqueous and organic phase for 2 minutes. In this condition, uranium and thorium which extracted were 67% and 0.84% respectively.

scholarly journals Increasing the depth of apatite processing by extracting rare-earth elements

2021 ◽  
Vol 266 ◽  
pp. 02002
Author(s):  
E.S. Lukyantseva ◽  
V.V. Sergeev
Keyword(s):  
Rare Earth ◽  
Phosphoric Acid ◽  
Rare Earth Elements ◽  
Extraction Process ◽  
Extractant Concentration ◽  
Wet Process ◽  
Heavy Rare Earth Elements ◽  
Knowledge Intensive ◽  
The Impact ◽  
Method Of Extraction

Currently, most high-technology productions are impossible without rare-earth elements (REE). The heavy rare-earth elements are of great interest as they have the highest market value and are in demand in the vast majority of knowledge-intensive industries. The main recourse of REE in Russia is apatite ore which is used in the production of fertilizers. As a result of its leaching, about 15-20% of REE goes to wet-process phosphoric acid. To enhance the depth of apatite processing, it is necessary to develop a technology which will allow obtaining rare-earth elements as by-products. The method of extraction and concentration of REE discussed in this paper was conducted by using the extractant based on di-(2-ethylhexyl) phosphoric acid (D2EHPA). The mechanism of extraction was studied, as well as the impact of the extractant concentration, phase ratio and the number of stages on the extraction process.

scholarly journals EXTRACTION OF RARE-EARTH ELEMENTS BY MIXES OF ISOMERS OF TRIBUTYLPHOSPHATE WITH NITRATE TRIALKYLMETHYLAMMONIUM

2018 ◽  
Vol 61 (7) ◽  
pp. 55
Author(s):  
Alexander V. Val'kov ◽  
Nadezhda D. Khmelevskaya
Keyword(s):  
Rare Earth ◽  
Synergistic Effect ◽  
Rare Earth Elements ◽  
Aqueous Phase ◽  
Organic Phase ◽  
Constant Composition ◽  
Salting Out ◽  
Isomolar Series ◽  
Variable Concentration ◽  
Gadolinium Nitrate

Results of studying of extraction of nitrates of rare-earth elements (REE) and trialkylmetylammoniya nitrate (TAMAN) are given by mixes of isomers of tributyl phosphate (TBP). Tri-iso-butylphosphate and tri - sec-butylphosphate are investigated as isomers of normal tributylphosphate. The water phase contained 8 mol/dm3 nitrate of ammonium and 5.10-4 mol/dm3 of neodymium nitrate at рН = 2-3. The content of extractants in isomolar series was varied in the range of 0-0.3 mol/dm3. It was established that synergistic effect decreases in a series of TBP> TIBP> TvtBP. Synergistic effect is calculated as the distribution coefficient relation at extraction by mix of extractants to the sum of coefficients of distribution at extraction by each of extractants. Synergistic effect reaches its maximum value at the ratio: [NPOC] : [TAMAN] = 2 : 1 for TBP and 4-5 : 1 for TiBP, TvtBP, and the absolute value fluctuates within 10-50 at extraction of microconcentration of REE. It is noted that the method of isomolar series is applied incorrectly in many researches with the violation of the fundamental requirements (variable concentration of rare earth metals and acid in the aqueous phase, an assumption of a possibility of simultaneous existence of several solvate, variable concentration of salting-out owing to extraction into the organic phase, the association and polymerization in the organic phase, etc..), which must be followed when using this method. Мultiple saturation method (MSM) is offered for a correct application of the method of isomolar series. The method consists in the fact that the organic phase is saturated repeatedly (5-6 times) with the original aqueous solution until a constant composition of the aqueous phase at all points of  isomolar series. It is possible to believe that the organic phase is responsible for the deviation from the additivity in this case. It was established that synergistic effect tends to unity or virtually disappears in the extraction of REE macroamounts method of ofisomolar series of multiple saturation. It is shown that value of synergistic effect approaches unity at gadolinium nitrate extraction by isomolar mix in the MSM mode. Synergistic effect for a mixture of rare earth elements is close to unity in the extraction of REE mixtures macroamounts of TiBP and TAMAN, and the individual elements are distributed in accordance with the extraction characteristics of each of the extractants alone: synergistic effect for several elements of cerium is greater than one, and yttrium - somewhat less than one. It is suggested that if there is free extragent the formation of mixed solvate may be explained by the steric effect, which disappears at saturation of extracgent.Forcitation:Val'kov A.V., Khmelevskaya N.D. Extraction of rare-earth elements by mixes of isomers of tributylphosphate with nitrate trialkylmethylammonium. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 7. P. 54-60

The Saponification Extraction Process and Result Analysis of Rare Earth Organic Phase

2013 ◽  
Vol 668 ◽  
pp. 132-135
Author(s):  
Yan Mei ◽  
Zuo Ren Nie
Keyword(s):  
Rare Earth ◽  
Organic Phase ◽  
Extraction Process ◽  
Rare Earth Ions ◽  
Ir Absorption ◽  
Absorption Frequency ◽  
Naoh Solution ◽  
Loaded Organic Phase ◽  
Result Analysis ◽  
The Rare Earth

10mol/L NaOH solution was used to saponify P507 (2-ethylhexylphosphonic acid mono-2-ethylhexyl ester) and then to extract and strip the rare earth cerium solution. The experimental procedure and results of the saponified organic phase and loaded organic phase were analyzed using IR spectrum and electrical conductivity meter. The results suggested the conductance value achieved highest when the saponified degree of alkaline solution was 60-80%, and the saponified organic phase formed a single-phase stable and uniform microemulsion. While the rare earth were extracted by P507, the IR absorption frequency of P=O decreased while the absorption intensity increased, suggesting that P=O group had been coordinated with the rare earth ions. More colloidal agglomerates in the loaded organic phase appeared when more rare earth was loaded.

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