Occurrence and recovery potential of rare earth elements in Finnish peat and biomass combustion fly ash

Perämäki, Siiri; Tiihonen, Antti; Väisänen, Ari

doi:10.1016/j.gexplo.2019.03.002

Cited by 24 publications

(12 citation statements)

References 30 publications

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“…This is very possible to be used for various purposes, for example, fertilizer which is an alternative and has a very cheap price. Because the remaining ash from biomass combustion contains a lot of nutrients for plant needs, such as K, Ca and Mg [81,82]. In addition, the composition of ash deposits from oil palm biomass is very similar to the chemical compounds from the remaining ash from coal combustion.…”

Section: Analysis Of Chemical Compounds In Ash Depositsmentioning

confidence: 99%

Experimental Studies on Combustion Characteristics of Oil-Palm Biomass in Fluidized-Bed: A Heat Energy Alternative

Hani

Mahidin

Husin

et al. 2020

ARFMTS

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One of the technologies that can be used to meet energy needs is biomass combustion. In this study, the oil palm biomass fuels used were empty fruit bunches, oil palm fibers, oil palm midribs, and palm kernel shells. This research was carried out by a direct combustion method using a fluidized-bed combustor. The purpose of this experiment was to investigate the reaction of kinetics and the mechanism of combustion of oilpalm biomass in fluidized-bed combustor. The characteristics observed in this test were the combustion temperature profile, flue-gas composition, and the composition of the ash-deposit chemical compound. The results of the experiments conducted showed that the best biomass combustion temperature profile was recorded at 2 kg biomass with an air flow rate of 0.9375 m 3 /s at 90.1%. The maximum temperature of biomass combustion recorded at biomass 3 kg with an air flow rate of 1.25 m 3 /s are 950 o C (95%). The higher conversion combustion of biomass was found at biomass condition of 3 kg with an air flow rate of 0.9375 m 3 /s. The value of O2 emissions from biomass combustion shows that it was very small 0.2%. While the highest CO2 value was recorded at 19.9%. The highest combustion efficiency on FBC found 1 kg of biomass fuel with an air flow rate of 0.0654 m 3 /s recorded 94.9%.

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Section: Analysis Of Chemical Compounds In Ash Depositsmentioning

confidence: 99%

Experimental Studies on Combustion Characteristics of Oil-Palm Biomass in Fluidized-Bed: A Heat Energy Alternative

Hani

Mahidin

Husin

et al. 2020

ARFMTS

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“…As a result of the increased use of biomass as a co-firing fuel in power plants, there is a corresponding increase in production of fly ash, with varying chemical properties which may not be suitable for traditional application in the cement/ concrete industry (Franus, Wiatros-Motyka, and Wdowin, 2014;Wdowin et al, 2014). Coal fly ash forms the bulk of the fly ash generated globally at an annual production rate of 750 Mt (Perämäki, Tiihonen, and Väisänen, 2019). Hence, it is important to investigate the recovery of REE as an alternative application for coal fly ashes.…”

Section: Introductionmentioning

confidence: 99%

The concentration of rare earth elements from coal fly ash

Abaka-Wood

Addai‐Mensah

Skinner

2022

J. S. Afr. Inst. Min. Metall.

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Recently, coal fly ash has become a potential candidate as a secondary resource of rare earth elements (REE). In this investigation, we studied the recovery of REE from fly ash from a commercial power plant. The specific aim was to assess the technical feasibility of recovering REE from the coal fly ash using conventional preconcentration methods, including gravity separation, magnetic separation, and froth flotation. The experimental results revealed that flotation achieved major gains in REE recovery and upgrading. However, during gravity and wet magnetic separation tests, the bulk of REE reported to the tailings. The results showed significant variations in the performance of the various beneficiation methods investigated. This study has confirmed that existing physical separation methods could be used to recover REE from coal fly ash prior to hydrometallurgical and pyrometallurgical processing, although some challenges persist.

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“…연소 온도 차이에 따른 것이기 때문으로 판단된다 [20][21][22]25) . [23][24][25][26][27] . 경제성 검토를 위한 TREO 기준 최저 가행 다 23,[28][29][30][31][32] .…”

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“…[4][5][6][7][8]10,12,[33][34][35][36] . 일반 적으로 PC 발전소의 경우, 반응 온도가 매우 높기 때문에 함된 석탄재의 주요 물질 성상 차이에서 발생한다 6,25) .…”

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Current Research Trends for Recovery of Rare Earth Elements Contained in Coal Ash

Kim¹,

Choi²,

Seo³

et al. 2020

J. of Korean Inst. of Resources Recycling

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This study aims to introduce and review on the recovery technologies of rare earth elements(REEs) from coal ash. Many researchers have been carried out by various beneficiation processes, such as particle size separation, magnetic separation, specific gravity, and flotation to recover rare earth elements from coal ash generated from Pulverized Coal(PC) boiler. Through the beneficiation process, it was confirmed that concentration of rare earth elements was much lower than the 4,700 ppm, and that additional enrichment treatment through wet process was needed for the products recovered after the beneficiation process. It was confirmed that the rare earth elements contained in coal ash were applied to the leaching process after pretreatment such as alkali-fusion to improve leaching efficiency. Although beneficiation and leaching methods have been studied, its optimum recovery technologies for rare earth elements not been confirmed up to now, research on the recovery of rare earth contained in coal ash is reported to continue. In case of Korea, the technology for the recovery of rare earth elements from coal ash and coal by-product could not been confirmed up to present. In these reasons, it is urgent to develop technologies such as beneficiation and leaching process continuously.

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Occurrence and recovery potential of rare earth elements in Finnish peat and biomass combustion fly ash

Cited by 24 publications

References 30 publications

Experimental Studies on Combustion Characteristics of Oil-Palm Biomass in Fluidized-Bed: A Heat Energy Alternative

Experimental Studies on Combustion Characteristics of Oil-Palm Biomass in Fluidized-Bed: A Heat Energy Alternative

The concentration of rare earth elements from coal fly ash

Current Research Trends for Recovery of Rare Earth Elements Contained in Coal Ash

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