Assessment of bottom ash landfilled at Ceplea Valley (Romania) as a source of rare earth elements

Valentim, Bruno; Abagiu, Alexandru Traian; Anghelescu, Lucica; Flores, Deolinda; French, David; Gonçalves, Paula Alexandra; Guedes, Alexandra; Popescu, Luminiţa; Predeanu, Georgeta; Ribeiro, Joana; Santos, Ana Cláudia; Slăvescu, Valerica; Ward, Colin R.

doi:10.1016/j.coal.2018.11.019

Cited by 24 publications

(12 citation statements)

References 82 publications

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“…The tracking of the lanthanides, Y and Sc, in the coal combustion ashes (FA and BA) was performed using the method from Valentim et al [72]. Although this method has been proven effective for the identification of the REE-bearing phases, it is time consuming and expensive.…”

Section: Scanning Electron Microscopy and Energy-dispersive X-ray Spe...mentioning

confidence: 99%

Integrative Study Assessing Space and Time Variations with Emphasis on Rare Earth Element (REE) Distribution and Their Potential on Ashes from Commercial (Colombian) Coal

et al. 2022

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The increasing demand for rare earth elements (REEs), which is associated with their economic importance and the supply risk, has motivated the research for alternative secondary sources of these elements. Coal and coal combustion ash have been pointed out as promising REE raw materials. This research seeks to understand REE fractionation, from feed coals to ashes, considering seasonal variations, and to assess the trends within the ash fractions that can be used for further beneficiation processes. Colombian commercial feed coals, combustion ashes, and their respective fractions were sampled from a Portuguese power plant and were characterized via petrographical, mineralogical, and chemical analyses. The total REE concentrations in the feed coals studied range between 6.97 and 23.15 ppm, while, in the ashes, they vary from 159.9 to 266.6 ppm. Fly ash (FA) from electrostatic precipitator (ESP) presented higher concentrations than the bottom (BA) and economizer (ECO) ashes. Furthermore, REEs and the LREE/HREE ratio increased slightly towards the back rows of the ESP. In the feed coals, the REEs are significantly correlated with ash, and they occur in micrometric phosphate minerals intermixed with clays. In the ashes, the REEs were mostly detected in micrometric particles, with P and Al-Si as the major components. The results from the fractioned samples show that the REEs were enriched in the fine (<25 µm) and nonmagnetic fractions of the ESP FA. A single trial combining sieving and magnetic separation enabled the attainment of a REE recovery of 53%, and a final enrichment factor of 1.25. Coal combustion ashes and their respective size fractions are promising REE raw materials; however, the REE oxide concentrations are below the economical cutoff of 1000 ppm.

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Section: Scanning Electron Microscopy and Energy-dispersive X-ray Spe...mentioning

confidence: 99%

Integrative Study Assessing Space and Time Variations with Emphasis on Rare Earth Element (REE) Distribution and Their Potential on Ashes from Commercial (Colombian) Coal

et al. 2022

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“…A result of the use of biomass for energy generation is the production of large amounts of ash during incineration. Ash is frequently considered an unwanted product because of its toxic elements, such as Cd, Ni, Pb, Cr, Zn, Co, and Cu (Maresca et al 2018;Munda et al 2016;Noyce et al 2016); therefore, large quantities of generated ash are regularly applied for landfills (Careddu et al 2015;Valentim et al 2019). Ash also contains major nutrients required by plants, except for nitrogen, and has liming properties due to its high contents of metal oxides and hydroxides (Maresca et al 2019;Qin et al 2017;Silva et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Different Effects of Ash Application on the Carbon Mineralization and Microbial Biomass Carbon of Reclaimed Mining Soils

Saidy

Hayati

Septiana

2020

J Soil Sci Plant Nutr

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Ash resulting from biomass energy resource utilization contains a wide range of metal oxides and hydroxides, which may influence the capacity of the ash to be used as a soil amelioration material. This study aimed to assess the effects of different ashes on changes in soil carbon (C) mineralization and soil microbial biomass carbon (MBC) in reclaimed mining soils (RMSs). Different levels (0, 25, 50, and 75 Mg ha −1) of three ashes (rice husk, oil palm shell, and coal fly ash) were applied to 10-year RMS for a 120-day incubation period. Carbon mineralization was measured over the 120-day incubation period, while MBC and selected chemical properties were quantified at the end of the incubation period. The results of the study showed that the application of rice husk and oil palm shell ash at all levels and coal fly ash at low levels (≤ 25 Mg ha −1) increased C mineralization and MBC. However, the C mineralization and MBC of the soil decreased significantly when the amount of added coal fly ash reached 75 Mg ha −1. These decreases in C mineralization and MBC may be ascribed to the harmful effect of high amounts of coal fly ash on microbial activity and the increased specific surface areas and contents of Ca, Mg, oxalate-and dithionite-extractable iron and aluminum in soil with high amounts of added coal fly ash. This study demonstrates that the application of different types of ash to RMS leads to different C mineralization and soil MBC responses.

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“…Compared with Li, REY in coal has been investigated more intensely. Anomalies of REY in coal and coal by-products were discovered in Russia Far East [21], United Kingdom, Poland [22], Romania [23], China [24][25][26][27][28][29], and United States [30][31][32][33]. Research on extracting REY from coal and coal by-products was recognized by the U.S. Department of Energy (DOE) in 2015 [34].…”

Section: Introductionmentioning

confidence: 99%

Mineralogical and Geochemical Characteristics of Lithium and Rare Earth Elements in High-Sulfur Coal from the Donggou Mine, Chongqing, Southwestern China

et al. 2020

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Coal and coal by-products are considered as the potential raw materials for critical elements (e.g., rare earth elements, Li, Ga, Ge, etc.), which have attracted much attention in recent years. The purpose of this study is to investigate the mineralogical and geochemical characteristics, and controlling geological factors of lithium and rare earth elements in the Lopingian (Wujiaping Formation) coal from the Donggou Mine, southeastern Chongqing Coalfield, China. Results indicate that lithium and rare earth elements are significantly enriched in the Donggou coals, which could be new potential alternative sources for critical elements. Concentrations of lithium and rare earth elements in the Donggou coals gradually increase from top to bottom. Lithium is mainly associated with kaolinite, while rhabdophane, florencite, goyazite, and xenotime are the main hosts of rare earth elements. The controlling geological factor is the groundwater leaching of underlying tuff, and to a lesser extent, the terrigenous clastic materials input from the top layer of the Kangdian Upland. This study provides mineralization information for lithium and rare earth elements exploration in coal measures.

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Assessment of bottom ash landfilled at Ceplea Valley (Romania) as a source of rare earth elements

Cited by 24 publications

References 82 publications

Integrative Study Assessing Space and Time Variations with Emphasis on Rare Earth Element (REE) Distribution and Their Potential on Ashes from Commercial (Colombian) Coal

Integrative Study Assessing Space and Time Variations with Emphasis on Rare Earth Element (REE) Distribution and Their Potential on Ashes from Commercial (Colombian) Coal

Different Effects of Ash Application on the Carbon Mineralization and Microbial Biomass Carbon of Reclaimed Mining Soils

Mineralogical and Geochemical Characteristics of Lithium and Rare Earth Elements in High-Sulfur Coal from the Donggou Mine, Chongqing, Southwestern China

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