Sulfuric acid bioproduction and its application in rare earth extraction from phosphogypsum

Tayar, Samir Prioto; Palmieri, Maurício César; Bevilaqua, Denise

doi:10.1016/j.mineng.2022.107662

Cited by 15 publications

(10 citation statements)

References 22 publications

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“…Studies found that a mixed culture of sulfur-oxidizing bacteria could leach 55-70% of REEs from PG within a 30-day incubation period at pH 1.5-1.8, which was mainly due to the sulfuric acid generated by these sulfur-oxidizing bacteria [90]. In addition, Tayar et al [91] demonstrated that the mesophilic Acidithiobacillus thiooxidans possessed higher sulfuric acid production even compared to strains containing thermophilic archeas, which achieved higher REE extraction (98% Nd, 60% Ce, 58% La, and 62% Y) in the two-step bioleaching.…”

Section: Bioleaching Methodsmentioning

confidence: 99%

A Critical Review of the Enhanced Recovery of Rare Earth Elements from Phosphogypsum

Xie,

Guan,

Zhou

et al. 2023

Molecules

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The increasing demand for rare earth elements (REEs), especially from new and innovative technology, has strained their supply, which makes the exploration of new REE sources necessary, for example, the recovery of REEs from phsophogypsum (PG). PG is a byproduct during the wet production of phosphoric acid, which is an attractive secondary resource for REEs due to a large amount of REEs locked in them. In most cases, REEs contained in PG are mainly encapsulated in the gypsum crystal, leading to a low leaching efficiency. Therefore, it is particularly important to use various methods to enhance the leaching of REEs from PG. In this review, we summarized and classified various enhanced leaching methods for the recovery of REEs from PG, and the advantages and disadvantages of different methods were compared. A joint method of recrystallization and RIL may be a promising enhanced leaching approach for the recovery of REEs from PG. Recrystallization could achieve both the complete REE release and simultaneous preparation of industrial materials with high value added, such as high-strength α-hemihydrate gypsum by phase transformation of PG, and the RIL technology could adsorb the releasing REEs and realize their efficient extraction. Such a combination appears to show significant advantages because of high REE recovery, as well as high value-added product preparation at low cost.

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Section: Bioleaching Methodsmentioning

confidence: 99%

A Critical Review of the Enhanced Recovery of Rare Earth Elements from Phosphogypsum

Xie,

Guan,

Zhou

et al. 2023

Molecules

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“…The chemical composition of the REM soil sample was described in our previous study, which primarily contains high concentrations of SO 4 2− and heavy metals such as Pb, Zn, and Mn ( Zhou et al, 2022 ). The SO 4 2− concentration was determined by referring to the turbidimetric method ( Tayar et al, 2022 ). According to the methods described by Singh, the concentration of heavy metals including Pb, Zn, and Mn from the leaching solution was determined by ICP-MS (Agilent Technologies 7700x, United States) ( Singh et al, 2022 ).…”

Section: Methodsmentioning

confidence: 99%

Insights into remediation effects and bacterial diversity of different remediation measures in rare earth mine soil with SO42− and heavy metals

et al. 2023

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The increased demand for rare earth resources has led to an increase in the development of rare earth mines (REMs). However, the production of high-concentration leaching agents (SO42−) and heavy metals as a result of rare earth mining has increased, necessitating the removal of contaminants. Here, a series of experiments with different remediation measures, including control (CK), sulfate-reducing bacteria (SRB) alone (M), chemicals (Ca(OH)2, 1.5 g/kg) plus SRB (CM-L), chemicals (Ca(OH)2, 3.0 g/kg) plus SRB (CM-M), and chemicals (Ca(OH)2, 4.5 g/kg) plus SRB (CM-H), were conducted to investigate the removal effect of SO42−, Pb, Zn, and Mn from the REM soil. Then, a high-throughput sequencing technology was applied to explore the response of bacterial community diversity and functions with different remediation measures. The results indicated that CM-M treatment had a more efficient removal effect for SO42−, Pb, Zn, and Mn than the others, up to 94.6, 88.3, 98.7, and 91%, respectively. Soil bacterial abundance and diversity were significantly affected by treatments with the inoculation of SRB in comparison with CK. The relative abundance of Desulfobacterota with the ability to transform SO42− into S2− increased significantly in all treatments, except for CK. There was a strong correlation between environmental factors (pH, Eh, SO42−, Pb, and Zn) and bacterial community structure. Furthermore, functional prediction analysis revealed that the SRB inoculation treatments significantly increased the abundance of sulfate respiration, sulfite respiration, and nitrogen fixation, while decreasing the abundance of manganese oxidation, dark hydrogen oxidation, and denitrification. This provides good evidence for us to understand the difference in removal efficiency, bacterial community structure, and function by different remediation measures that help select a more efficient and sustainable method to remediate contaminants in the REM soil.

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“…They thrive in acidic environments and produce organic acids that help dissolve minerals containing REEs. Bacterial strains like Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans were studied for their ability to solubilize REEs from ores (Hong et al 2023 ; Hosseini et al 2022 ; Tayar et al 2022 ). Bioleaching by bacteria can be followed by accumulation of REEs by algae Euglena sp.…”

Section: Bio-recovery Of Reesmentioning

confidence: 99%

Microbial recovery of rare earth elements from various waste sources: a mini review with emphasis on microalgae

Vítová,

Mezricky

2024

World J Microbiol Biotechnol

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Rare Earth Elements (REEs) are indispensable in contemporary technologies, influencing various aspects of our daily lives and environmental solutions. The escalating demand for REEs has led to increased exploitation, resulting in the generation of diverse REE-bearing solid and liquid wastes. Recognizing the potential of these wastes as secondary sources of REEs, researchers are exploring microbial solutions for their recovery. This mini review provides insights into the utilization of microorganisms, with a particular focus on microalgae, for recovering REEs from sources such as ores, electronic waste, and industrial effluents. The review outlines the principles and distinctions of bioleaching, biosorption, and bioaccumulation, offering a comparative analysis of their potential and limitations. Specific examples of microorganisms demonstrating efficacy in REE recovery are highlighted, accompanied by successful methods, including advanced techniques for enhancing microbial strains to achieve higher REE recovery. Moreover, the review explores the environmental implications of bio-recovery, discussing the potential of these methods to mitigate REE pollution. By emphasizing microalgae as promising biotechnological candidates for REE recovery, this mini review not only presents current advances but also illuminates prospects in sustainable REE resource management and environmental remediation.

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Sulfuric acid bioproduction and its application in rare earth extraction from phosphogypsum

Cited by 15 publications

References 22 publications

A Critical Review of the Enhanced Recovery of Rare Earth Elements from Phosphogypsum

A Critical Review of the Enhanced Recovery of Rare Earth Elements from Phosphogypsum

Insights into remediation effects and bacterial diversity of different remediation measures in rare earth mine soil with SO42− and heavy metals

Microbial recovery of rare earth elements from various waste sources: a mini review with emphasis on microalgae

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