1. Introduction. Rare earth elements (REEs) have been called the metals of technology due to their numerous applications in advanced material science, including phosphors, lasers, ceramics, electronics, magnets, catalysis and many more (Abou-Hassan et al., 2010, Cytec, 2013).REEs are in fact fairly abundant in the Earth's crust but are …

In this paper, a chemical process route to obtain a mixed rare earth carbonate from a monazite concentrate, was investigated. The results of the digestion, leaching, and precipitation experiments ...

The 60 percent REO concentrate is treated with. Rare-earth element - Processing Ores: All rare-earth ores contain less than 10 percent REO and must be upgraded to about 60 percent in order to be processed further. ... (TBP) is used as the organic phase to extract the rare-earth ion from the highly acidic nitric acid aqueous phase. Other ...

A stepwise carbochlorination-chemical vapor transport-oxidation process is developed for the green rare earth extraction from a bastnaesite concentrate using carbon as reductant, chlorine gas as chlorination agent, SiCl4 gas as defluorination agent, AlCl3 as vapor complex former, and (O2+H2O) mixed gas as oxidant. Between 500 °C and 800 …

In this study, rare earth elements were recovered from bastnäsite concentrate using supercritical carbon dioxide extraction with nitric acid/tributyl phosphate adducts. Two bastnäsite pretreatment methods were used to render the rare earth elements amenable to recovery: 1) dry roasting of the source material at 730 °C for 3 h, and 2 ...

The decomposition of rare earth ore concentrate and the extraction, separation, purification, and recovery of rare earth oxide, rare earth compound, and single rare earth element are accomplished ...

Rare earth minerals are usually insoluble in water and poorly dissolved in mineral acids under normal conditions, and thus a procedure known as concentrate decomposition is always conducted to convert these insoluble minerals into …

Mineral processing (sometimes called mineral dressing or ore dressing) is the preparation of ore from the stage that the material is brought out of the mine (also …

The cracked concentrate is then leached to dissolve REE in a solution and subsequently recover those via neutralization, precipitation or solvent extraction methods. This paper reviewed the cracking and leaching methods applied to REE concentrates to produce an intermediate product for further REE separation.

To extract rare earth elements economically, multiple sequential physical and chemical separation steps are used to. produce a mixture of rare earth salts, followed by purification and. production ...

Comparing with CA12 extraction system (25 stages, 99.5 wt.%) [38] and CA12-Cyanex 272 extraction system (25 stages, 99.80 wt.%) [32], the separation of yttrium from ion-absorbed rare earth concentrate is quite effective using the current POPA extraction system. Compared with NA extraction system, the separation of yttrium can …

Abstract. Bastnaesite is a natural rare-earth fluorcarbonate of the cerium group that affords an abundant and highgrade source of the lighter rare-earth elements. A simple and efficient method has been developed by the Bureau of Mines for extracting rare-earth compounds from this mineral. Digesting of a flotation concentrate with sulfuric acid ...

The rare earth concentrate is from Mount Weld in Australia which contains 40% REO, 0.16% ThO 2 and 0.003% U 3 O 8 (Anon., 2010, ... D2EHPA can extract rare earths at very low pH and is commonly used for the separation of light rare earths from medium and heavy ones between Nd and Sm, ...

Phosphate rock contains traces of rare earth elements (REEs) and can be a secondary source of these critical materials as large tonnages of phosphate rock are mined annually. Attention has mostly focused on the extraction of REEs from phosphogypsum, which contains more than 70 percent of the REEs reporting to phosphate concentrate, …

In this paper, a chemical process route to obtain a mixed rare earth carbonate from a monazite concentrate, was investigated. The results of the digestion, leaching, and precipitation experiments ...

LAMP processes lanthanide concentrate (LC) to extract rare earth elements and subsequently produce large volumes of water leach purification (WLP) residue containing naturally occurring radioactive material (NORM). This residue has been rising up the environmental issue because it was suspected to accumulate thorium with …

A solvent extraction process for separation of high-purity yttrium from ion-absorbed rare earth concentrate using POPA was developed, which are superior to sec-octylphenoxy acetic acid (CA12) and naphthenic acid (NA). ... Solvent extraction of rare earth ions from nitrate media with new extractant di-(2,3-dimethylbutyl)-phosphinic acid. …

In this study, the yttrium will be extracted from Nd hydr oxide concentrate (Nd (OH)) as the product. of a rare -earth hydroxide (REOH) pilot plant. As an aquatic phase is Nd (OH) concentrate ...

The paper deals with two rare earth elements (REE) concentrates recovered from uranium leach liquors after sorption separation of uranium. Activity of the REE concentrates was found to be 106 Bq kg−1; Ac-227 and its short-lived daughter products were the main radioactive impurities contributing more than 99% of total activity. Activity …

Lu et al. (1998) studying the solvent extraction of Ce (IV) and Th (IV) from sulfate solutions with Cyanex 923 in n-hexane, found the extraction of Ce (IV) to be insensitive to acidity, while. the ...

Kolar et al. [28] have studied the microfluidic solvent extraction of rare earth elements from a mixed oxide concentrate leach solution using Cyanex 572, and found good selectivity using the ...

Abstract. An excellent extraction selectivity towards Sc over other REEs in 4 mol/L HCl solution was achieved with the separation factor βSc/REEs over 8000 by 2 …

An excellent extraction selectivity towards Sc over other REEs in 4 mol/L HCl solution was achieved with the separation factor βSc/REEs over 8000 by 2-ethylhexyl phosphoric acid mono 2-ethylhexyl ester (HEHEHP) and the extraction equilibrium can be obtained within 20 min. The extracted Sc can be stripped using 5 mol/L NaOH solution …

A stepwise carbochlorination-oxidation process was developed for the rare earth extraction from mixed bastnaesite-monazite concentrate using carbon as reductant, chlorine gas as chlorination agent ...

Rare earth minerals are usually associated with a variety of gangue minerals, resulting in low rare earth contents. To reduce the dosage of chemical reagents and energy consumption in the metallurgical processes, a series of mineral processing methods such as gravity separation and magnetic separation, are always carried out to pre …

The main techniques for the extraction of REEs from the monazite concentrate require highly corrosive reagents in large quantities and high processing temperatures [14]. Currently, acid baking with H 2 SO 4 is widely being used for the dephosphorylation of monazite concentrate in which the concentrate gets mixed by …

Therefore, we investigated microfluidic solvent extraction (microSX) of REEs from a leached mixed rare earth oxide (REO) mineral concentrate using a phosphorus-based cationic exchange extractant (Cyanex® 572). A Y–Y microchip was used, in which the aqueous and organic phases were contacted for up to 15 s with sub-second …

The study aimed to employ a comprehensive methodology for the acid processing of a rare earth element (REE) concentrate obtained from the ore from Araxá (MG-Brazil). The most important process …

Scandium recovery from ion-adsorption rare earth concentrate with HEHEHP as extractant [J]. Journal of Central South University, 2021, 28(3): 679−689. DOI: …

Chapter. Extraction of Rare Earths From RE Concentrates. January 2018. DOI: 10.1016/B978-0-12-813920-2.00001-5. In book: Hydrometallurgy of Rare Earths …

After filtration or counter current decantation (CCD), solvent extraction is usually used to separate individual rare earths or produce mixed rare earth solutions …

The rare earth concentrate at this stage of extraction is in chloride form and can be applied to some applications directly such as catalyst for petroleum cracking, …

Acid mine drainage is a legacy environmental issue and one of the largest pollutants in many mining districts throughout the world. In prior work, the authors have developed a process for the recovery of critical materials, including the rare earth elements, from acid mine drainage using a preconcentration step followed by solvent extraction as a …

1. Citations. - LEARN ABOUT THESE METRICS. Share. Add to. Export RIS. Read Online PDF (8 ) Get e-Alerts. Abstract. The traditional rare earth extraction …

Geology, deposit types, and ore minerals. There are more than 200 minerals that contain REE. 7,8 The most common rare-earth minerals are monazite and bastnäsite (Figure 1a–b and Table II).Monazite exists as a group of arsenates, phosphates, and silicates, but the primary REE-bearing monazite is a complex phosphate. 5 Bastnäsite, …

@article{Kolar2016MicrofluidicSE, title={Microfluidic solvent extraction of rare earth elements from a mixed oxide concentrate leach solution using Cyanex{textregistered} 572}, author={Elisabeth Kolar and Rik P.R. Catthoor and Frederik Hermanus Kriel and Rossen Sedev and Scott Middlemas and Eric M. Klier and Gareth P. …