Characterization of bottom ashes from coal pulverized power plants to determine their potential use feasibility

Menéndez, Esperanza; Alvaro, A. M.; Argiz, Cristina; Parra, J. L.; Moragues, Amparo

doi:10.3989/cyv.372013

Cited by 12 publications

(6 citation statements)

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“…In particular, 43 wt% of MLT sample exhibit a size >2.5 mm, whereas the most abundant grain size fraction in DIM, KAR and MGL samples is below 0.63 mm and above 0.18 mm, with a percentage of 45 wt%, 47 wt% and 59 wt%, respectively. It is well known that the mechanical and durability properties of concretes depend on the grain size distribution of BA [6,8,10]. Since the grain size of BA particles of this study resembles the grain size of fine aggregates with low percentage of silt-clay, it could be concluded that BA can successfully replace the fine aggregates in the manufacturing of concrete [9,10].…”

Section: Granulometry and Minerochemical Compositionmentioning

confidence: 52%

“…Bottom ash is used globally in concrete industry, road constructions, geotechnical and environmental applications, e.g. as aggregate in lightweight concrete, as fine aggregate in cement mortars, as a raw material in the cement clinker raw meal, as a soil amendment, in asphalt mixes etc.. [5][6][7][8][9][10][11]. In Greece, it is entirely deposited in abandoned lignite mine sites and/or in landfills.…”

Section: Introductionmentioning

confidence: 99%

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A comprehensive analytical characterization of Greek lignite bottom ash samples

et al. 2021

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Bottom ash samples were collected from four lignite power plants of Greece. Granulometric analysis was executed and after homogenization four distinct fractions (>1.25, 0.63-1.25, 0.18-0.63, <0.18 mm) were obtained. The samples were analyzed by X-Ray Diffraction (XRD) and Energy Dispersive System (EDS), while thermogravimetry (TG/DTG) and stereomicroscope viewing were applied for the coarse fractions. Furthermore, proximate analysis (moisture, ash, volatiles, fixed carbon) was undertaken and Loss on Ignition (LOI) and calorific values were determined. The particle size distribution revealed that bottom ash satisfies the gradation criteria for concrete and geotechnical applications. The mineral composition included mainly amorphous matter, quartz, plagioclase, calcite and gehlenite and minor amounts of pyroxene, portlandite, hematite, micas etc.. The chemical analysis showed Si, Ca, Al, Mg, Fe, S as major and Ti and K as minor chemical elements, indicating high slagging and fouling potential within the thermal chambers. Based on the chemistry and mineralogy of the bottom ash samples, a potential utilization in concrete manufacturing is discussed, taking into account certain limitations. Based on LOI, proximate analysis, calorific values and TG/DTG profiles of the coarse fractions (>1.25 mm), certain differences in the characteristics of the bottom ash of the younger and the three older power plants were observed. High amounts of unburnt carbon were determined in the coarse fraction (>1.25 mm) of all plants except the younger one, indicating a problematic combustion within the chambers and a potential of reburning these coarse material in a waste to energy application.

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Section: Granulometry and Minerochemical Compositionmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

A comprehensive analytical characterization of Greek lignite bottom ash samples

et al. 2021

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“…It is composed of fine particles that remain suspended in the airstream. FA makes up about 80% of the total ash produced in the aforementioned process; the remaining 20% is made up of the BA that fall and vitrify at the bottom of the furnace and is characterized by a coarser granulometry compared to FA (Asokan et al, 2015;Menéndez, et al, 2013;Siddique, 2010). Ashes can damage the environment and human health due to their heterogeneous composition, size, and physical and chemical properties (Jaramillo-Nieves et al, 2020;Wang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Aqueous Recovery of Zinc and Lead from Coal Fly Ashes of a Colombian Thermoelectric Plant

2023

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A hydrometallurgical treatment under ambient conditions was proposed in order to eliminate and recover the lead and zinc contained in a sample of thermal coal fly ash used to produce energy. By using leaching solutions with conventional inorganic acids (HCl, HNO3, and H2SO4), ferric chloride, and sodium citrate, more than 90% zinc and approximately 40% lead were obtained. The most favorable leaching conditions were set at 0,5 M, with a pH value of 8 for citrate. Two leaching stages were necessary to optimize metal recovery: the first with nitric acid for zinc extraction and the second one with citrate for the lead. The sulfur phases of the metals limited a complete metal extraction.

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“…Asokan, Saxena e Asolekar (2005), Babbitt e Lindner (2005), Ramadoss e Sundararajan (2014), dentre outros autores, citam que a poluição ambiental, causada pelo carvão utilizado em usinas termelétricas e por seus resíduos, é vista como uma das principais fontes de poluição, afetando o ambiente no que concerne ao uso da terra, à saúde humana, ao ar, ao solo e à água e acarretando graves impactos ambientais. Portanto, a valorização e reutilização desses resíduos tornou-se uma questão importante nas últimas décadas (Menéndez et al, 2013). A valorização engloba diferentes oportunidades de agregar valor econômico aos resíduos, tais como a reciclagem, a compostagem, o aproveitamento energético de aterros e o coprocessamento de resíduos industriais, processos em que, segundo Paulli (1995apud TEIXEIRA, 2001, os resíduos são considerados como fonte de matéria-prima para um novo ciclo de produção.…”

Section: Introductionunclassified

O uso da avaliação do ciclo de vida e da ecoeficiência para avaliar alternativas de valorização de resíduos: um estudo em empresa termelétrica

et al. 2016

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O usO da avaliaçãO dO ciclO de vida e da ecOeficiência para avaliar alternativas de valOrizaçãO de resíduOs: um estudO em empresa termelétrica use of life cycle assessment and eco-efficiency to evaluate alternative waste recovery: a study in the thermal power plant resumO O objetivo deste artigo é apresentar um método para avaliar alternativas de valorização de resíduos usando de modo combinado a Avaliação do Ciclo de Vida (ACV) e medidas de ecoeficiência. Esse método foi aplicado às cinzas pesadas -resíduos provenientes da combustão de carvão mineral em usinas termelétricas -empregadas como matéria-prima alternativa à areia industrial utilizada na produção de materiais cerâmicos e também ao clínquer utilizado na produção de cimento Portland. A avaliação da ecoeficiência foi realizada conforme a norma NBR ISO 14045, que orienta que os impactos ambientais devem ser avaliados por meio da utilização da ACV. Os resultados mostraram que a ecoeficiência relativa da geração de cinzas pesadas para uso na indústria de revestimentos cerâmicos comparada com a geração de cinzas pela termelétrica dispostas nas lagoas passaria de 0,2% inferior para 0,97% superior. Já a ecoeficiência relativa da geração de cinzas pesadas para uso na indústria de cimento comparada com a geração de cinzas pela termelétrica dispostas nas lagoas passaria de 1% inferior para valores entre 2,4% e 11,5% superiores. A aplicação do método indicou, assim, que o uso das cinzas pesadas na produção de materiais cerâmicos ou na substituição do clínquer na produção de cimento Portland melhora a ecoeficiência das empresas termelétricas.Palavras-chave: Avaliação do ciclo de vida (ACV), Carvão mineral, Cinzas pesadas, Ecoeficiência, Valorização de resíduos.

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Characterization of bottom ashes from coal pulverized power plants to determine their potential use feasibility

Cited by 12 publications

References 13 publications

A comprehensive analytical characterization of Greek lignite bottom ash samples

A comprehensive analytical characterization of Greek lignite bottom ash samples

Aqueous Recovery of Zinc and Lead from Coal Fly Ashes of a Colombian Thermoelectric Plant

O uso da avaliação do ciclo de vida e da ecoeficiência para avaliar alternativas de valorização de resíduos: um estudo em empresa termelétrica

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