Leaching of Rare Earth Elements (REEs) from lake sediments around Eppawala phosphate deposit, Sri Lanka: A secondary source for REEs

Dushyantha, Nimila; Ratnayake, Nalin Prasanna; Premasiri, Hmr; Ilankoon, I.M.S.K.; Hemalal, Pva; Jayawardena, Chulantha; Chandrajith, Rohana; Rohitha, Lps; Abeysinghe, A.M.K.B.; Dissanayake, Kithsiri; Dharmaratne, P.G.R.; Ratnayake, Amila Sandaruwan; Batapola, Nadeera

doi:10.1016/j.hydromet.2021.105751

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…However, the Chinese rare earth industry mainly fulfils the current global rare earth consumption, including value-added products such as rare earth magnets [5]. These factors have attracted significant attention to the exploration and extraction of REEs from new and secondary sources [8] to diversify global rare earth supply chains [5].…”

Section: Introductionmentioning

confidence: 99%

Recovery Potential of Rare Earth Elements (REEs) from the Gem Mining Waste of Sri Lanka: A Case Study for Mine Waste Management

et al. 2022

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Sri Lanka is one of the wealthiest countries in terms of gems. Therefore, gem mining is extensively carried out in many areas of Sri Lanka, including districts such as Ratnapura, Monaragala, Matale, and Kalutara. During the mining process, only valuable gemstones are collected, and the remaining gravel fraction with many heavy minerals is discarded. Therefore, the gem mining industry produces a large amount of waste that is mainly used only for backfilling. To sustainably manage this waste stream, gem mining waste collected from a gem pit at Wagawatta in the Kalutara district in Sri Lanka was investigated for value recovery, specifically for rare-earth elements (REEs). The gem-bearing alluvial layer contained 0.3% rare-earth oxide (REO) that could easily be upgraded up to 2.8% (LREEs = 94%) with wet sieving and subsequent density separation via a shaking table. Therefore, the concentrates of gem mine tailings with REE-bearing minerals have the potential to be a secondary source for LREEs. The organic-rich clay layer underlying the gem-bearing alluvial layer contained 0.6% REO with 49% HREEs, including Gd, Dy, Er, Yb, and especially Y enrichments. Detailed explorations are thus necessary to assess the REE potential in Sri Lanka’s gem mining waste, and value recovery flowsheets should be subsequently developed to economically extract REEs. In addition, the presence of high U concentrations (800 mg/kg) in the concentrated samples could be alarming when considering the health and safety of the people engaged in gem mining. This aspect also requires detailed research studies.

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Section: Introductionmentioning

confidence: 99%

Recovery Potential of Rare Earth Elements (REEs) from the Gem Mining Waste of Sri Lanka: A Case Study for Mine Waste Management

et al. 2022

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“…Chemical stabilisation of soil is beneficial for leaching of the environmentally toxic elements. Examples of leaching from the stabilised soils include immobilisation of heavy metals [17,18], rare earth elements [19,20], or removing environmentally dangerous pollutants [21]. By stabilising organic soils with supplementary cementitious material, such as high carbon fly ashes, such treatment helps improving the geotechnical characteristics, performance and environmental properties of soil [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Leaching of Heavy Metals from Contaminated Soil Stabilised by Portland Cement and Slag Bremen

Lindh

Lemenkova

2022

Ecological Chemistry and Engineering S

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Leaching behaviour is an important evidence of soil quality. The assessment of leaching of heavy metals from the contaminated soil is vital for environmental applications. However, leaching may differ in soil stabilised by various ratios of binders. In this study we measured leaching behaviour of soil contaminated by As, Cd, Co, Cr, Cu, Hg, Ni, Pb, V, Zn, methyl Hg, aliphatic compounds of hydrocarbons, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) and dissolved organic carbon (DOC). To evaluate leaching of these substances we tested the effects of changed amount of binder (120 kg and 150 kg) and binder ratios (70/30 %, 50/50 % and 30/70 %) added to soil samples. Soil was dredged from several stations in Ostrand area, SCA Sundsvall Ortvikens Pappersbruk. The results demonstrated a systematically decreasing leaching with the increased slag. The contribution of this research include: (i) devising systematic approach to extract information on leaching from stabilised soil collected from the coastal area of Bothnian Bay, (ii) developing a workflow for stabilising soils by various combination of Portland cement Basement CEM II/A-V (SS EN 197-1) and ground granulated blast furnace slag (GGBFS), Bremen type (SS EN 15167-1), (iii) determining water ratio and density for the untreated and stabilised soil and performing comparative analysis, (iv) evaluating chemical content of pollutants and toxic elements in the aggregated soil samples. Treatment of the contaminated soil by binders improved its parameters by the increased strength and decreased leaching of heavy metals and toxic elements.

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The potential of REEs in the Eppawala Phosphate Deposit, Sri Lanka: REE enrichment, mineralization, and economic significance

Batapola,

Ratnayake,

Abeysinghe

et al. 2023

Environ Earth Sci

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Leaching of Rare Earth Elements (REEs) from lake sediments around Eppawala phosphate deposit, Sri Lanka: A secondary source for REEs

Cited by 3 publications

References 22 publications

Recovery Potential of Rare Earth Elements (REEs) from the Gem Mining Waste of Sri Lanka: A Case Study for Mine Waste Management

Recovery Potential of Rare Earth Elements (REEs) from the Gem Mining Waste of Sri Lanka: A Case Study for Mine Waste Management

Leaching of Heavy Metals from Contaminated Soil Stabilised by Portland Cement and Slag Bremen

The potential of REEs in the Eppawala Phosphate Deposit, Sri Lanka: REE enrichment, mineralization, and economic significance

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