Tecnologia Mineral Para Cinzas Da Combustão De Carvão Mineral Da Região Carbonífera Do Baixo Jacuí-Rs

Sabedot, Sydney; Sundstron, Marcelo Garcia; Miltzarek, Gerson Luis; Sampaio, Carlos Hoffmann

doi:10.4322/2176-1523.0832

Cited by 4 publications

(5 citation statements)

References 4 publications

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“…e physic-chemical properties of the coal ash may vary depending on the composition and the calorifi c value of the coal, the degree of benefi ciation and grinding of the coal, the operation of the boiler, the system of extraction and handling of the ashes, the mineralogical composition of the deposit and the sampling process to compose a sample for studies. us, it is possible to expect, especially as to the particle size distribution of bottom ash, diff erent results in diff erent boilers inside a TPP and even at diff erent times and situations of burning inside the same boiler (Goethe, 1990;Lovell et al, 1991;Sabedot et al, 2015). Table 1 presents results for pH of the materials evaluated in the present study.…”

Section: Resultsmentioning

confidence: 76%

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Environmental Viability for Material Developed From Coal Bottom Ash for Highways Under Construction

Sabedot

Alves²,

Santarem³

2019

R. Ci. Amb.

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e increase of the quality of life of the contemporary Man also leads to the increase of the generation of energy. Many alternative sources of energy have been explored, but coal is still an important input, contributing around 29% of the world's energy matrix, despite environmental controversies about its use. Its burning in thermal plants generates the solid bottom ash residue, a material with little application and with potential to generate environmental damages in the places where they accumulate. e Southern Region of Brazil is a region producing coal and the bottom ash generated in its burning is not being used, generating a large environmental liability in the courtyard of the companies producing the input. e present study developed with the cited residue had as objective to defi ne a technological product for its application in the construction of highways and to fi nd a way for the economic and environmental use of the bottom ash. As the authors consider that the goal was achieved, they understand that the importance of the present study is centered in this fact. A product with 87% bottom ash, 5% fl y ash and 8% Portland cement was developed, with adequate mechanical resistance to its application on base and sub-base of road pavement, proving itself a commercial and environmentally sustainable alternative for the use of the residue. Leaching and solubilization tests indicated that the product is chemically inert according to Brazilian environmental standards.

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Section: Resultsmentioning

confidence: 76%

“…According to Ferret (2004), the pH of the coal ashes can vary from 4.5 to 12.0 depending on the geochemical characteristics of the coal and of the precursor deposit. It is assumed that the diff erent values in the three studies are associated with this fact or those mentioned above by Goethe (1990), Lovell et al (1991) and Sabedot et al (2015).…”

Section: Resultsmentioning

confidence: 98%

Environmental Viability for Material Developed From Coal Bottom Ash for Highways Under Construction

Sabedot

Alves²,

Santarem³

2019

R. Ci. Amb.

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“…The amount of coal ash produced in the world is approximately 500 million tons per year [1]. According to Sabedot et al (2015) [1], burning this fuel produces ashes that are classified as slag, bottom ash (heavy), and fly ash (light). Slag and bottom ash are particles of varying dimensions, usually coarse, that accumulate in temporary deposits in companies that burn coal; light ash, or fly ash, is made up of particles smaller than 0.15 nm and is carried away by combustion gases [2].…”

Section: Introductionmentioning

confidence: 99%

“…According to Sabedot et al (2015) [1], burning this fuel produces ashes that are classified as slag, bottom ash (heavy), and fly ash (light). Slag and bottom ash are particles of varying dimensions, usually coarse, that accumulate in temporary deposits in companies that burn coal; light ash, or fly ash, is made up of particles smaller than 0.15 nm and is carried away by combustion gases [2]. The largest amount of waste generated from this burning is fly ash (84% of the total coal ash) [1,3].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Parameters and Methodology for the Synthesis of LTA-Type Zeolite Using Light Coal Ash

2020

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The synthesis of zeolites using waste as a source of Si and Al is well known, and light coal ash has been studied to minimize the problems of waste management and mitigate environmental effects. The residue used in this work was supplied by Coal Workers Assistance Society (SATC) Criciúma–SC/Brazil, and had 24.09% Al2O3 and 54.25% SiO2 in its chemical composition. Synthesis studies using this residue with the objective of obtaining LTA zeolites were carried out by hydrothermal means, alkaline fusion, and the combination of the two methods, varying parameters such as crystallization time, Na/T ratio, OH/ratio, ultrasound exposure, gel agitation temperature, and the alkaline melting temperature of the residue. The results were characterized by X-ray diffraction (XRD) techniques and scanning electron microscopy (SEM-FEG). It was possible to obtain 70% crystalline zeolite type LTA for the first time at mild conditions with temperatures below 200 °C by alkaline fusion with smaller amounts of NaOH and short times (2 h). Thus, suitable parameters were determined for future scaling.

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“…As características físicas, químicas e mineralógicas das cinzas dependem de fatores como a composição do carvão de origem, as condições de combustão, o tipo e a eficiência do sistema de controle de emissões e os métodos de disposição utilizados [4]. Em temperaturas adequadas, este material favorece a formação de fases mineralógicas que propiciam um aumento da resistência mecânica do agregado produzido, como é o caso da mulita.…”

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Estudo da sinterização em reator vertical de leito fixo para produção de agregado sintético

et al. 2017

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INTRODUÇÃOA sociedade moderna valoriza processos que envolvam reciclagem de materiais. Deste modo, os investimentos relacionados ao aproveitamento de resíduos tornaram-se essenciais ao desenvolvimento como alternativa de proteção ambiental [1]. Um exemplo disto são as usinas termelétricas, que geram cinzas a partir da queima de carvão mineral. Este resíduo vem sendo estudado visando, entre outras aplicações, um possível aproveitamento como matéria-prima na fabricação de blocos e tijolos além de produtos cerâmicos especiais [2,3]. As cinzas volantes como matéria-prima para produção de agregado sintético apresentam-se como outra alternativa para o reaproveitamento do resíduo em função das características físico-químicas que este material apresenta. ResumoOs agregados sintéticos vêm sendo empregados na construção civil como uma medida para redução do extrativismo mineral. Dentro desse contexto, a reciclagem de resíduos industriais configura hoje a base da maioria dos processos de redução da exploração dos recursos minerais. Neste trabalho estudou-se a sinterização em reator vertical de leito fixo para produção de agregado sintético, a partir de 20% de pelotas e 80% de carvão vegetal. As pelotas foram confeccionadas a partir de uma mistura contendo argila, carvão vegetal e cinza volante. Realizaram-se dois experimentos variando a velocidade de sucção do ar. O material produzido foi analisado por difração de raios X, microscopia eletrônica de varredura, medidas de suas propriedades cerâmicas e classificação quanto à sua granulometria. As análises dos resultados demonstraram que as reações de estado sólido, durante o processo de sinterização, foram eficientes e que o agregado produzido foi classificado como leve e graúdo. O processo se mostrou interessante para a sinterização de agregados, podendo ser controlado pela composição, granulometria, gradiente de temperatura e fluxo gasoso. Palavras-chave: cinza volante, agregado sintético, sinterização, reator de leito fixo. AbstractThe

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Tecnologia Mineral Para Cinzas Da Combustão De Carvão Mineral Da Região Carbonífera Do Baixo Jacuí-Rs

Cited by 4 publications

References 4 publications

Environmental Viability for Material Developed From Coal Bottom Ash for Highways Under Construction

Environmental Viability for Material Developed From Coal Bottom Ash for Highways Under Construction

Optimization of Parameters and Methodology for the Synthesis of LTA-Type Zeolite Using Light Coal Ash

Estudo da sinterização em reator vertical de leito fixo para produção de agregado sintético

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