Extractive Metallurgy of Rare Earths

Gupta, C. M.; Krishnamurthy, N.

doi:10.1201/9780203413029

Cited by 205 publications

(175 citation statements)

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“…먼저 중성추출제인 TBP는 질산용액에 적용되며 추출능력이 크나, 경희토류금속의 분리에만 효과가 있 다 2) . 질산용액에서 TBP에 의한 희토류 금속의 추출반 응을 다음에 나타냈다 3) . .…”

Section: 유기인산계 추출제에 의한 희토류 금속의 추출율은unclassified

“…한편 monazite에서 경희토류 성분을 분리회수하기 위한 Indian Rare Earths공정에서는 염산용액에서 PC 88A를 추출제로 사용한다 3) . Rhône-Poulenc공정은 monazite를 침출시킨 염산용액에서 D2EHPA를 사용하여 희토류 성 분을 분리회수하며, 용매추출만으로 희토류 각 성분을 5N의 순도로 분리할 수 있다고 알려져 있다 3) . 경희토류인 La, Ce, Pr, Nd이 중희토류와 혼합되어 .…”

Section: 유기인산계 추출제에 의한 희토류 금속의 추출율은unclassified

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Separation of Light Rare Earth Elements by Solvent Extraction with a Mixture of Cationic and Tertiary Amine

Lee¹,

Son²

2017

Journal of the Korean Institute of Resources Recycling

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Rare earth elements with high purity are demanded for the manufacture of advanced materials. Light rare earth elements are contained in domestic monazite and Ni-MH batteries. In this paper, solvent extraction to separate the light rare earth elements from hydrochloric acid leaching solutions of these resources was discussed. A mixture of cationic and tertiary amine shows synergistic effect on the extraction of LREEs and the extent of pH decrease during extraction is reduced. The effect of solution pH on the extraction and synergism was reviewed. Acquisition of the operation data with mixer-settler on the separation of LREEs by this mixture is necessary to develop a process.

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Section: 유기인산계 추출제에 의한 희토류 금속의 추출율은unclassified

Separation of Light Rare Earth Elements by Solvent Extraction with a Mixture of Cationic and Tertiary Amine

Lee¹,

Son²

2017

Journal of the Korean Institute of Resources Recycling

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“…Monazite ore processing is a complicated matrix which is mainly attributed to the presence of high phosphate (25 % of P 2 O 5 ) and sulfate concentration 25 hence, influence the extraction and separation of REEs and other elements. Therefore, the effect of medium on the presence of the investigated elements was studied individually in sulfate and phosphate media using 0.1 M H 2 SO 4 and 0.1 M H 3 PO 4 .…”

Section: Effect Of Mediummentioning

confidence: 99%

Subsequent separation and selective extraction of thorium (IV), iron (III), zirconium (IV) and cerium (III) from aqueous sulfate medium

et al. 2016

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Regarding to their presence as an important constituent in some ores such as monazite, this work aims for selective solvent extraction of thorium (IV), zirconium (IV), iron (III) and cerium (III) from aqueous sulfate medium using different basic and acidic extractants. To elucidate the extractability of these elements, different effective parameters were studied such as contact time, pH value, extractant concentration and the diluents type. In a single element system, Th (IV) was extracted by the primary amines (octylamine and tert.octylamine) and the acidic extractnts [di-(2-ethylhexyl) phosphoric acid (D2EHPA) and (bis(2,4,4-trimethyl pentyl) phosphinic acid (Cyanex 272))]. Moreover, secondary amine (N-methylaniline) is effective for Fe (III) extraction while, the primary amines are suitable for Zr (IV) extraction. Ce (III) can be extracted with the primary amines and D2EHPA. In a mixed elements system, Th (IV) was extracted firstly with Cyanex 272 (65 %) at pH 1 followed by the extraction of Fe (III) with N-methylaniline (95 %), then Zr (IV) was precipitated at pH 2.5 (84 %) while Ce (III) remains in the final aqueous phase.

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“…In relation to acid treatment, there are 3 ways employed for monazite after removing thorium (Th) and uranium (U), which include sodium double sulphate precipitation, neutralization by ammonia hydroxide and neutralization by sodium oxalate. 25 For monazite after minerals sodium removing impurities and radioactive element, alkaline treatment is available in 4 ways including dissolution by HCL, H 2 SO, and HNO 3 . 25 In bastnasite processing, REO was leached by various routes including calcite REO between 800-900 o C, Flotation process and calcite by 10% of HCL or 30% of HCL at 620 o C or dissolution of H 2 SO 4 at 480 o C. 25 In relation to xenotime processing, there are 3 ways to leach out REO, which include digestion by 93% of H 2 SO 4 at 190-250 o C, roasting of Na 2 CO 3 at 900 o C and fusion of NaOH at 400 o C. These methods are leached by using water or extracted by means of using NH 4 …”

Section: 37mentioning

confidence: 99%

“…[17][18][19][20][21][22][23] Notably, most of xenotime minerals are discovered alongside with monazite with an estimated amount of 0.5-5.0% concentration of xenotime in monazite. [24][25] Besides, ion-adsorption clays (i.e., weather crust elution deposit rare earths) are also considered as one of the major types of REE ores. 5,26 These deposits have indicated relatively higher weathered REE-rich rocks which are developed from chemical weathering under particular climatic changes.…”

Section: Introductionmentioning

confidence: 99%

A Review of Rare Earth Mineral Processing Technology

Suli

Ibrahim

Aziz

et al. 2017

Chem. Eng. Res. Bull.

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Abstract:The recent technological advancement has made the rare earth elements (REEs) more significant and they in turn have facilitated the culmination of more new technological applications owing to their unique physical and chemical properties. In this regard, renewable energy applications such as wind turbine and hybrid cars testify to the increasing demands on permanent magnet in the future. Considering such increasing demands on REEs, it is felt necessary to identify alternative producers of REEs outside of China as one of the measures to create a fair competition and control the price on the market. It is worth highlighting that the separation of rare earth can be both complex and challenging owing to similar properties which are shared by them. The purpose of this paper is to comprehensively review and summarize the rare earth processing routes, the mostly employed rare earth separation methods, supply and demand of rare earth around the world and some possible scenarios in rare earth market. This review has critically looked into a few authors' recent reviews on six major processes of rare earth processing steps and each step is considered as important to produce both high quality and better quantity of REEs.

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Extractive Metallurgy of Rare Earths

Cited by 205 publications

References 0 publications

Separation of Light Rare Earth Elements by Solvent Extraction with a Mixture of Cationic and Tertiary Amine

Separation of Light Rare Earth Elements by Solvent Extraction with a Mixture of Cationic and Tertiary Amine

Subsequent separation and selective extraction of thorium (IV), iron (III), zirconium (IV) and cerium (III) from aqueous sulfate medium

A Review of Rare Earth Mineral Processing Technology

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