Centrifugal extraction of rare earths from wet-process phosphoric acid

Wang, Liangshi; Yu, Ying; Liu, Ying; Long, Zhiqi

doi:10.1007/s12598-011-0370-x

Cited by 30 publications

(12 citation statements)

References 10 publications

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“…Addition of surfactants enhances the growth of gypsum crystals and improves the leaching of rare earths (Wang et al, 2010). Non-equilibrium extraction via centrifugal contacting was able to increase the separation factor between rare earths and iron more than 250 times (Wang et al, 2011a).…”

Section: Recovery Of Rare Earths From Phosphoric Acidmentioning

confidence: 99%

Towards zero-waste valorisation of rare-earth-containing industrial process residues: a critical review

Binnemans

Jones

Blanpain

et al. 2015

Journal of Cleaner Production

516

282

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The supply risk for some critical rare-earth elements (REEs), which are instrumental in many cleantech applications, has sparked the development of innovative recycling schemes for Endof-Life fluorescent lamps, permanent magnets and nickel metal hydride batteries. These waste fractions represent relatively small volumes, albeit with relatively high rare-earth contents.Nevertheless, rare earths are also present in lower concentrations in a multitude of industrial process residues, such as phosphogypsum, bauxite residue (red mud), mine tailings, metallurgical slags, coal ash, incinerator ash and waste water streams. This review discusses the possibilities to recover rare earths from these "secondary resources", which have in common that they contain only low concentrations of rare-earth elements, but are available in very large volumes and could provide significant amounts of rare earths. The success rate is set to increase if the rare-earth recovery from these industrial waste streams is part of a comprehensive, zero-waste, "product-centric" valorisation scheme, in which applications are found for the residual fractions that are obtained after removal of not only the rare earths but also other valuable (base) metals.

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Section: Recovery Of Rare Earths From Phosphoric Acidmentioning

confidence: 99%

Towards zero-waste valorisation of rare-earth-containing industrial process residues: a critical review

Binnemans

Jones

Blanpain

et al. 2015

Journal of Cleaner Production

516

282

View full text Add to dashboard Cite

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“…The solvent extraction of REEs and U with D2EHPA from WPA is an ion exchange process between hydrogen ion and metal ions, which takes place at the interface between organic and aqueous phases (Geist et al, 1999). The extraction reaction can be described by equation below (Krea and Khalaf, 2000;Wang et al, 2011):…”

Section: Effect Of D2ehpa Concentration On the Extraction Of Hrees Anmentioning

confidence: 99%

Simultaneous recovery of rare earths and uranium from wet process phosphoric acid using solvent extraction with D2EHPA

Wang

Zhang³

et al. 2018

Hydrometallurgy

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In most cases, wet-process phosphoric acid (WPA) contains trace amount of rare earth elements and uranium, which ultimately enter and accumulate in soil and may cause environmental damages. In order to remove and recover these elements, studies about solvent extraction of heavy rare earth elements (HREEs) and uranium (U) with D2EHPA, selective stripping of HREEs from U, and evaporation precipitation of light rare earth elements (LREEs) were investigated. Extraction efficiency of U from WPA was greatly enhanced, but HREEs extraction were significantly retarded when using the solvent mixture of di-(2-ethylhexyl) phosphoric acid (D2EHPA) and tri-butyl-phosphate (TBP) or tri-octyl-phosphine oxide (TOPO) compared with D2EHPA alone. 89.4 % and 94.2% accumulative two-stage extraction efficiencies of HREEs and U, respectively, were achieved with 1.0 M D2EHPA alone. And more than 98.1% HREEs were selectively stripped from loaded D2EHPA with 6.0 M HCl via three stages. In addition, LREEs were enriched to 1204.3 ug/g in evaporation sludge during the concentration process of phosphoric acid from 30% to 50% P 2 O 5 , and the filtration performance was greatly improved. Based on the studies, an alternative process was developed to recover and group LREEs, HREEs and U during the phosphoric acid production.

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“…Some ores will be richer in certain trace elements than others. For instance, some post-Jurassic phosphates proved to have progressively heavier REE enrichments (Jiang et al, 2007), and PR ores in Quebrada del Hierro -Khalek et al, 2011;AblowSlama et al, 2014;Bunuş et al, 1994;Crouse and Brown, 1958;Ragheb and Khasawneh, 2010;Ulrich et al, 2014;c Bunuş et al, 1994;Krea and Khalaf, 2000;Lokshin et al, 2011;Pereira and Bilal, 2012;Preston et al, 1996;Wang et al, 2010Wang et al, , 2011d Van Kauwenbergh, 2006;Sadegh Safarzadeh et al, 2007;Syers, 2001;Van Kauwenbergh, 2002, 2006e Crouse and Brown, 1958;Weterings and Janssen, 1985;f Huang et al, 2010;Liu et al, 2008;Van Kauwenbergh, 2006;g Lu, 2010;Yang and Luo, 2013 , 2002). Though the average U content in PR is 0e390 ppm with a median of 61.8 ppm (Table 5), some Canadian commercial-rich ores have up to 15% (Ragheb and Khasawneh, 2010).…”

Section: Discussionmentioning

confidence: 99%