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.

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.

scholarly journals Distribution of characteristic elements in the radioactive rocks of the northern part of Kvanefjeld, llímaussaq intrusion, South GreenJand

1982 ◽  
Vol 109 ◽  
pp. 1-32
Author(s):  
H Kunzendorf ◽  
P Nyegaard ◽  
B.L Nielsen
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Country Rock ◽  
Volcanic Rocks ◽  
Extraction Process ◽  
Transition Zones ◽  
Gravity Settling ◽  
Drilling Operations ◽  
High Concentrations ◽  
Marginal Zones

About 600 one-metre drill core sections from lujavrites and country rock xenoliths of northem Kvanefjeld were analysed for Li, Be, F, Na, K, Ca, Ti, Mn, Fe, Cu, Zn, Y, Zr, Nb, Pb, Th and U. The samples were taken from 7 of the 23 drill cores of the 1977 drilling operations. The analysed rocks were divided into seven rock groups: (1) naujakasite lujavrite, (2) naujakasite lujavrite with visible villiaumite, (3) arfvedsonite lujavrite, (4) arfvedsonite lujavrite with visible villiaumite, (5) volcanic rocks (lava and gabbro), (6) sheared volcanic rocks, and (7) sheared volcanic rocks with visible Nb minerals. Naujakasite lujavrite (both groups) has high concentrations of Th, U and Y at relatively low Zr contents. Arfvedsonite lujavrite (both groups) has high Zr contents but lower contents of Th, U and Y than naujakasite lujavrite. Thorium, U and Y generaIly accumulate at upper levels of lujavrites, mostly at the contact to xenoliths. This is thought to be caused by temperature gradients at the contacts. Zirconium enrichment occurs at lower levels of mainly arfvedsonite lujavrites expressing gravity settling of eudialyte during crystallisation. Naujakasite lujavrite is regarded as the youngest and most differentiated lujavrite. Microscopic and chemical investigations of two transition zones of lava and gabbro at contacts with lujavrites revealed typical features of metasornatic action, Le. formation of aegirine, arfvedsonite, albite, microcline, pectolite and other minerals. A general increase of sodium from the unaffected volcanic rocks towards the lujavrite contact is accompanied by a depletion of silicon and other elements. Niobium mineralisation is confined to sheared marginal zones of country rock xenoliths. Resource evaluation for Zr, Nb, Zn, Be, F, Li and rare earth elements of the rocks of northem Kvanefjeld suggest Nb and rare earth elements as potential by-products of a possibie uranium extraction process of the Kvanefjeld ore, while F should be extracted for mainly environmental reasons.

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