Recovery of rare earths from wet-process phosphoric acid

Wang, Liangshi; Long, Zhiqi; Huang, Xiaowei; Yu, Ying; Cui, Dali; Zhang, Guocheng

doi:10.1016/j.hydromet.2009.11.017

Cited by 158 publications

(76 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…where x=0 for calcium sulphate anhydrate, x=0.5 for hemihydrate, and x=2 for dehydrate (Wang et al, 2010. In the wet process leaching tests, concentrate samples were digested at 80°C by a mixture of concentrated sulphuric and phosphoric acids. A summary of the conditions of the leaching experiments at different acid concentrations and a solid-to-liquid ratio of 1: 5 is shown in Table III.…”

Section: Selection Of An Appropriate Leaching Methods For Light Reesmentioning

confidence: 99%

“…This may be due either to monazite-xenotime not being attacked during leaching, or to encapsulation of REEs by the growth of phosphogypsum crystals during the crystallization process (Figure 7). It has been found that the lanthanides are present in isomorphous substitution with Ca 2+ in the gypsum (Wang et al, 2010;Habashi, 1985).…”

Section: Selection Of An Appropriate Leaching Methods For Light Reesmentioning

confidence: 99%

“…As mentioned, most of the rare earth values end up in the significant amounts of phosphogypsum formed in the dissolution reaction (Figures 7 and 8). Although various techniques to recover rare earths from the phosphogypsum have been developed, these are considered too complex and uneconomical to be industrialized (Wang et al, 2010).…”

Section: Selection Of An Appropriate Leaching Methods For Light Reesmentioning

confidence: 99%

See 2 more Smart Citations

Selection of an appropriate leaching method for light REEs from Esfordi flotation concentrate based on mineral characterization

Soltani

Abdollahy

Koleini

et al. 2017

J. South. Afr. Inst. Min. Metall.

View full text Add to dashboard Cite

The rare earth elements (REEs) comprise a set of 17 chemical elements in the periodic table, specifically the 15 lanthanides plus scandium and yttrium. REEs and alloys that contain them are used in devices such as computer memory, rechargeable batteries, cell phones, catalytic converters, magnets, fluorescent lighting, and many more (Krishnamurthy and Gupta, 2004). China supplies about 94% of the REE demand, with the remaining 6% coming from Russia and Estonia, the USA, India, Malaysia, and Brazil (Zhanheng, 2011). Increased industrial development in China has prompted the Chinese government to limit annual export quotas to approximately 35 kt of rare earth oxides (REOs), while non-Chinese annual demand is expected to reach 80 kt by the year 2015. This constriction of supply is being met by the development of many new rare earth mining projects, each of which has its own unique mining and processing

show abstract

Section: Selection Of An Appropriate Leaching Methods For Light Reesmentioning

confidence: 99%

Section: Selection Of An Appropriate Leaching Methods For Light Reesmentioning

confidence: 99%

Section: Selection Of An Appropriate Leaching Methods For Light Reesmentioning

confidence: 99%

See 1 more Smart Citation

Selection of an appropriate leaching method for light REEs from Esfordi flotation concentrate based on mineral characterization

Soltani

Abdollahy

Koleini

et al. 2017

J. South. Afr. Inst. Min. Metall.

View full text Add to dashboard Cite

show abstract

“…The fluoride ions remaining in the purified diluted PA after re-extraction can be efficiently removed in the concentration operation to produce PA of food and analytical grade [23]. …”

Section: Cross-current Multi-stage Extraction Of H 3 Pomentioning

confidence: 99%

Purification of Wet Process Phosphoric Acid by Solvent Extraction using Cyclohexanol

Jian

et al. 2017

SERDJ

View full text Add to dashboard Cite

Solvent extraction using organic solvents is an important technology for the purification of wet process phosphoric acid (WPA). In this study, the purification process of WPA, using a new type of solvent extraction system, cyclohexanol diluted in kerosene, was investigated. The equilibrium phase diagram of the system H 3 PO 4 H 2 O solvent mixtures at 313.2K was obtained. The effects of extraction time, phosphoric acid concentration, cyclohexanol concentration, temperature, phase ratio on extraction efficiency were studied. The extracted species was shown to be 2H 3 PO 4 · 2C 6 H 12 O. The extraction process of H 3 PO 4 is exothermic and the enthalpy change, H, was obtained. Via a cross-current three-stage extraction, the solvent mixtures have a high efficiency for phosphoric acid purification from the actual industrial WPA with an H 3 PO 4 extraction yield of 90.2% at room temperature. The study is capable of enriching theoretical foundation and technical guidance for the phosphoric acid purification process.

show abstract

“…Indeed, the XRD analysis of the residue after leaching shows the presence of gypsum (CaSO4•2H2O) and anhydrite (CaSO4) ( Figure 5). This residue may contain REEs by isomorphous substitutions for Ca 2+ [8,12,17,18], because Ca and REEs have similar ionic radii. To confirm the existence of REEs in the precipitated gypsum and CaSO4, the leaching residue was dried in atmosphere and was washed with water.…”

Section: Magnetic Separationmentioning

confidence: 99%

Optimization of Acid Leaching of Rare-Earth Elements from Mongolian Apatite-Based Ore

et al. 2016

View full text Add to dashboard Cite

Abstract:Optimization of the acid leaching process for Mongolian apatite-based ore containing rare-earth elements (REEs) was studied. The ore contained approximately 10% of REEs as total rare earth oxides, and the major impurities were Ca (33% as CaO) and Fe (23% as Fe 2 O 3 ). Fe bearing minerals could be removed by passing the sample through a wet high-intensity magnetic separator before leaching. After magnetic separation, basic leaching tests were conducted to investigate the influence of the acid type and concentration, temperature, and the pH on the REE leaching level and kinetics. Hydrochloric acid was found to be the most effective leaching agent, leaching more than 90% of REEs in an hour. However, the concentrations of Ca ions in the leachate were also high, which would complicate recovery of the REEs. Therefore, to reduce the amount of Ca ions in the leachate, a two-stage leaching procedure was attempted. In stage 1, the sample was preleached using 1.0 M hydrochloric acid to dissolve Ca. In stage 2, the solid residue of stage 1 was leached using 2.0 M hydrochloric acid to dissolve REEs. Consequently, this two-stage leaching significantly reduced the Ca concentration in the final leachate without affecting the leaching levels of REEs.

show abstract

Recovery of rare earths from wet-process phosphoric acid

Cited by 158 publications

References 28 publications

Selection of an appropriate leaching method for light REEs from Esfordi flotation concentrate based on mineral characterization

Selection of an appropriate leaching method for light REEs from Esfordi flotation concentrate based on mineral characterization

Purification of Wet Process Phosphoric Acid by Solvent Extraction using Cyclohexanol

Optimization of Acid Leaching of Rare-Earth Elements from Mongolian Apatite-Based Ore

Contact Info

Product

Resources

About