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Локшин, Э. П.; Vershkova, Yu. A.; Vershkov, A. V.; Tareeva, O. A.

doi:10.1023/a:1022285330832

Cited by 21 publications

(9 citation statements)

References 2 publications

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“…2НF + СаО = СаF 2 + H 2 O (6) or similar reactions with Ca(OH) 2 . Table 4 lists the impurity concentrations in a solution originally containing no free sulfuric acid and in solutions obtained upon its neutralization with various amounts of hydrated lime and separation of precipitates enriched in phosphorus and fl uorine, and Table 5 presents the mass and composition of dried precipitates.…”

Section: Methodsmentioning

confidence: 99%

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Production of high-quality gypsum raw materials from phosphogypsum

Локшин

Tareeva

2015

Russ J Appl Chem

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Possibility of obtaining high-quality gypsum products from phosphogypsums produced in sulfuric acid processing of the Khibiny apatite concentrate was examined. A variant of phosphogypsum processing including the sulfuric acid leaching of rare-earth elements and admixtures of phosphorus and fl uorine compounds, neutralization of the purifi ed gypsum product, and utilization of phosphates and fl uorides released from phosphogypsum was considered. It was experimentally demonstrated that the agitation sulfuric acid leaching is ineffi cient for purifi cation of phosphogypsums. It was confi rmed that combining a percolation sulfuric acid leaching of phosphogypsums with their preliminary washing with water is promising for obtaining high-quality gypsum raw materials.

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Section: Methodsmentioning

confidence: 99%

“…The agitation leaching with 26 wt % H 2 SO 4 solution for 25 min at a ratio between the volume of the liquid phase and the phosphogypsum mass, V l : s = 2 : 1, enables effective purifi cation of PHH to remove phosphates [6]. However, the effi ciency of REE recovery into the concentrate from a solution of this kind is insuffi cient [7].…”

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confidence: 99%

Production of high-quality gypsum raw materials from phosphogypsum

Локшин

Tareeva

2015

Russ J Appl Chem

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“…Similar patterns were observed by Ismail et al [33] where the temperature effect was investigated. Lokshin et al [59], reported a high leaching efficiency of REEs up to 93% using 15 wt % HNO 3 concentration and S:L ratio 1:10. It was found that with a high S:L ratio, the leaching efficiency of REEs increased with increasing the concentration of HNO 3 below 15 % wt and decreased gradually with continuous increasing of the concentration from 15% wt and above.…”

Section: Direct Leachingmentioning

confidence: 99%

Rare Earths’ Recovery from Phosphogypsum: An Overview on Direct and Indirect Leaching Techniques

et al. 2021

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The need for rare earths elements (REEs) in high tech electrical and electronic based materials are vital. In the global economy, deposits of natural REEs are limited except for countries such as China, which has prompted current attempts to seek alternative resources of REEs. This increased the dependence on major secondary rare earth-bearing sources such as scrap alloy, battery waste, spent catalysts, fly ash, spent magnets, waste light-emitting diodes (LEDs), and phosphogypsum (PG) for a substantial recovery of REEs for use. Recycling of REEs from these alternative waste sources through hydrometallurgical processes is becoming a sustainable and viable approach due to the low energy consumption, low waste generation, few emissions, environmentally friendliness, and economically feasibility. Industrial wastes such as the PG generated from the production of phosphoric acid is a potential secondary resource of REEs that contains a total REE concentration of over 2000 mg/kg depending upon the phosphate ore from which it is generated. Due to trace concentration of REEs in the PG (normally < 0.1% wt.) and their tiny and complex occurrence as mineral phases the recovery process of REE from PG would be highly challenging in both technology and economy. Various physicochemical pre-treatments approaches have been used up to date to up-concentrate REEs from PG prior to their extraction. Methods such as carbonation, roasting, microwave heating, grinding or recrystallization have been widely used for this purpose. This present paper reviews recent literature on various techniques that are currently employed to up-concentrate REs from PG to provide preliminary insight into further critical raw materials recovery. In addition, the advantages and disadvantages of the different strategies are discussed as avenues for realization of REE recovery from PG at a larger scale. In all the different approaches, recrystallization of PG appears to show promising advantages due to both high REE recovery as well as the pure PG phase that can be obtained.

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“…Rare earth elements and barium are also enriched in the PG [1]. Lokshin et al [4]. mentioned that during production of phosphoric acid with sulfuric acid, the main part of lanthanides passes to CaSO 4 ·2H 2 O phase.…”

Section: Introductionmentioning

confidence: 99%

Treatment of phosphogypsum waste using suitable organic extractants

El-Didamony

Ali

Awwad

et al. 2011

J Radioanal Nucl Chem

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Phosphogypsum (PG) is a residue of the phosphate fertilizer industry that has relatively high concentrations of harmful radioactive materials. The reduction in concentration of the radionuclides from PG was investigated. The removal process is based on leaching of radionuclides using suitable organic extractants. The studied radionuclides were 226Ra, 210Pb, 238U and 40K. The factors affect the leaching process such as type of leaching materials, contact time, concentration of the desired solvent, liquid to solid ratio, and temperature were studied. Based on the experimental results, about 71.1, 76.4, 62.4, and 75.7% of 226Ra, 210Pb, 238U and 40K respectively were successfully removed from the PG. The reduction in the concentration of radionuclides was accompanied by reduction in the concentration of rare earth elements (∑REE) equals to 69.8%. Using the desired organic extractant under optimum conditions for treatment of the PG waste leads to obtain a decontaminated product that can be safely used in many industrial applications.

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Cited by 21 publications

References 2 publications

Production of high-quality gypsum raw materials from phosphogypsum

Production of high-quality gypsum raw materials from phosphogypsum

Rare Earths’ Recovery from Phosphogypsum: An Overview on Direct and Indirect Leaching Techniques

Treatment of phosphogypsum waste using suitable organic extractants

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