Rare earths concentration from phosphogypsum waste by two-step leaching method

Hammas-Nasri, Ines; Horchani−Naifer, Karima; Férid, Mokhtar; Barca, Donatella

doi:10.1016/j.minpro.2016.02.011

Cited by 76 publications

(30 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Except for the time of leaching, the other reaction parameters have not been studied over continuous intervals (in general, fixing three arbitrary values to be tested for each parameter), which is one of the major gaps that we have avoided by the adoption of RSM [19,20]. Figure 6 of the 3D response surface curves shows that the main parameters having a significant influence on the rare earth leaching process adopted are the following: acid percentage, temperature, and S/L ratio.…”

Section: Ree-dimensional (3d) Response Surface and Isoresponse Curvesmentioning

confidence: 99%

“…e global desirability function D, which is taking into account both the requirements on all the responses Y i , is the geometric mean of the individual desirability d i . e desirability function varies in the interval [0, 1]; the value 1 corresponds to the maximum satisfaction (desired value) and 0 corresponds to an unacceptable response [19,21]. e maximum of the function D gives the best global compromise for all the responses in the studied domains and corresponds to optimal experimental conditions.…”

Section: Optimizationmentioning

confidence: 99%

See 1 more Smart Citation

Hydrochloric Acid Leaching Study of Rare Earth Elements from Moroccan Phosphate

Amine

Asafar

Bilali

et al. 2019

Journal of Chemistry

View full text Add to dashboard Cite

As part of the valorization of the Moroccan phosphate rock by extraction of rare earths, different experiments on natural Moroccan phosphate from the Gantour Basin (basin of phosphate in the Youssoufia area) were done in the REMATOP laboratory. e response surface methodology was used to study the effects of the influence of different parameters (acid concentration, solid/ liquid ratio, duration of the reaction, stirring speed, and temperature) on the progress of the phosphate rock's dissolution process to determine the optimal parameters for the extraction of rare earths. e analyses were made at the same time on the mineral matrix and the solutions resulting from the attack of this matrix by different concentrations of hydrochloric acid. e rare earth analyses done by the ICP-MS technique have shown an overall amount of rare earths (ΣREs) of 228.408 ppm with the existence of yttrium as the major element.

show abstract

Section: Ree-dimensional (3d) Response Surface and Isoresponse Curvesmentioning

confidence: 99%

Section: Optimizationmentioning

confidence: 99%

Hydrochloric Acid Leaching Study of Rare Earth Elements from Moroccan Phosphate

Amine

Asafar

Bilali

et al. 2019

Journal of Chemistry

View full text Add to dashboard Cite

show abstract

“…The studies above showed that HCl and HNO 3 were more efficient agencies than H 2 SO 4 for leaching REEs from PG, but H 2 SO 4 was still industrially preferred because of economical reasons. A two-step leaching method was introduced with H 2 SO 4 as the lixiviant using a Tunisian PG [25]. The PG sample was firstly washed with distilled water and after solid-liquid separation underwent a double leaching with 10% H 2 SO 4 solution at 60˚C, for 1 -2 h of continuous stirring at L/S ratio of 1.3.…”

Section: Acid Leaching Of Rees From Pgmentioning

confidence: 99%

Phosphogypsum Processing for Rare Earths Recovery—A Review

Yang¹,

Salvador²,

Makkonen³

et al. 2019

View full text Add to dashboard Cite

As a by-product from the phosphate fertilizer industry Phosphogypsum (PG) was considered a potentially valuable source of the rare earth elements (REEs). Because of trace concentration of REEs in the PG (normally <0.1% wt) and also their tiny and complex occurrence phases the recovery process would be highly challenging in both technology and economy. The studies on occurrences of REEs, REE recovery by physical methods and leaching using different lixiviants such as inorganic acids, H 2 SO 4 , HCl and HNO 3 , and organic chemicals, the effects of mechanical treatment of PG by microwaving and grinding on leaching efficiency of REEs, and resin-in-leach process were reviewed in the paper.

show abstract

“…Because these wastes have very fine grain sizes and complex mineralogical compositions, the reprocessing of them for economic recovery of REEs becomes very challenging [3]. Research was carried out to verify whether the wastes might be useful as a raw material for REEs recovery [4][5][6][7][8][9][10][11][12] and the manufacture of building materials [1]. However, the extraction of REEs and other valuable elements from these wastes in phosphate processing has not been industrially realized, while trace elements are considered one of the main environmental concerns of direct use [13].…”

Section: Introductionmentioning

confidence: 99%

Rare Earth Occurrences in Streams of Processing a Phosphate Ore

2019

View full text Add to dashboard Cite

Rare earth elements (REEs) are defined as lanthanides with Y and Sc. Rare earth occurrences including the REE-bearing phases and their distributions, measured by rare earth oxides (REOs), in the streams of processing a phosphate ore were determined by using MLA, the mineral liberation analysis and EPMA, the electron probe microanalysis. The process includes an apatite ore beneficiation by flotation and further processing of the beneficiation concentrate with sulfuric acid. Twenty-six, sixty-two and twelve percent of the total REOs (TREO) contents from the ore end up in the products of beneficiation tailings, phosphogypsum (PG) and phosphoric acid, respectively. Apatite, allanite, monazite and pyrochlore are identified as REE-bearing minerals in the beneficiation process. In the beneficiation tailings, the REEs are mainly distributed in monazite (10.3% TREO), apatite (5.9% TREO), allanite (5.4% TREO) and pyrochlore (4.3% TREO). Gypsum, monazite, apatite and other REE-bearing phases were found to host REEs in the PG and the REEs distributions are 44.9% TREO in gypsum, 15.8% TREO in monazite, 0.6% TREO in apatite and 0.6% TREO in other REE-bearing phases. Perspectives on the efficient recovery of REEs from the beneficiation tailings and the PG are discussed.

show abstract

Rare earths concentration from phosphogypsum waste by two-step leaching method

Cited by 76 publications

References 16 publications

Hydrochloric Acid Leaching Study of Rare Earth Elements from Moroccan Phosphate

Hydrochloric Acid Leaching Study of Rare Earth Elements from Moroccan Phosphate

Phosphogypsum Processing for Rare Earths Recovery—A Review

Rare Earth Occurrences in Streams of Processing a Phosphate Ore

Contact Info

Product

Resources

About