Caracterização detalhada de material de referência certificado de carvão brasileiro

Fallavena, Vera L. V.; Abreu, Cristiane S. de; Inácio, Taísi D.; Pires, Marçal; Azevedo, Carla M.N.; Fernandes, Iolanda D.; Ferret, Lizete Senandes; Martı́nez-Tarazona, M. Rosa

doi:10.1590/s0100-40422013000600020

Cited by 12 publications

(12 citation statements)

References 12 publications

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“…Table 3 shows that Kaolinite was present in a higher percentage (62.3%), followed by quartz (31.5%) and pyrite (6.2%). Pyrite content is in accordance with [31], which e crystalline phases identified in FC sample are in accordance with the results presented by [28] and [23] which have studied Brazilian coal samples. It is important to highlight that the mass percentages obtaine by the Rietveld Method (Table 3) were calculated without the amorphous phase.…”

Section: Feed Coal Characterizationsupporting

confidence: 91%

“…Sample mass variation as a function of temperature was evaluated by ermo Gravimetric Analysis (TGA) using the TGA thermogravimetric analyzer SDTA 851 -Me ler Toledo. For the feed coal, a mass of 9.3 mg of the previously dried sample was heated using a rate of 10 ° C min -1 in an inert nitrogen atmosphere with a flow of 50 mL min -1 , and followed by an isotherm at 1200 ° C in an oxygen atmosphere during 15 min [23]. For the ashes, 7 mg of each sample was previously dried and analyzed under a dynamic nitrogen atmosphere with a flow of 50 mL min -1 and heated until reach 1200 ° C using a rate of 10 ° C min -1 .…”

Section: Ermal Analysismentioning

confidence: 99%

“…When the sample was placed in an oxidizing atmosphere (from 1200 °C), there was a rapid weight loss of 29.8%, related to the combustion of fixed carbon present in feed coal. According to [23], the peak at 440°C in DTG curve can be a ributed to the pyrolysis process of the compounds with structures less stable usually present in Brazilian coal samples as well as the thermal e weight loss of FC sample caused by the loss of organic ma er (26.47%) together with the weight loss related to the content of fixed carbon at 1200 °C (29.8%) corroborates to the content of total carbon determined for this sample (55.32% - Table 1), showing that these two techniques can be complementary in the characterization study of coal. In addition, TGA-DTG analysis also confirms the results of loss on ignition obtained for FC sample (72.2% - Table 1), which is related to the loss of volatile ma er, organic ma er and fixed carbon, with weight losses of 15.93%, 26.47%, and 29.8%, respectively.…”

Section: Feed Coal Characterizationmentioning

confidence: 99%

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Physical and Chemical Characteristics of Feed Coal and its by-products from a Brazilian Thermoelectric Power Plant

Izidoro

Miranda

Castanho

et al. 2019

J. Appl. Mat. Tech.

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In this study, feed coal (FC) from the Figueira Thermoelectric Power Plant (FTPP), located in the state of Paraná (PR), Brazil was characterized by X-ray fluorescence (XRF), X-ray diffractometry (XRD), infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), particle size distribution analysis by laser diffraction, loss of ignition (LOI), total carbon content (TC), pH and conductivity. FC-derived by-products (CCBs) collected at the FTPP were: bottom ash (BA), fly ash from cyclone filter (CA) and fly ash from bag filter (FA). In addition to the techniques used for feed coal characterization, CCBs were also characterized by total surface area (by using BET method), external surface area (by using laser diffraction), cation exchange capacity (CEC), bulk density, besides leaching and solubilization tests. FC sample contains 72.2% of volatile material, of which 55.3% is total carbon content. LOI, FTIR, TGA and TC analyzes corroborated with these results. The main crystalline phases in the FC sample were found to be quartz, kaolinite and pyrite. The elements As, Cr, Ni and Pb were encountered in the FC sample, indicating that the use of FTPP feed coal should be monitored due to the toxic potential of these elements. The three coal ashes were classified as class F according to ASTM and presented similar chemical composition, with total content of the main oxides (SiO2, Al2O3 and Fe2O3) above 72%. Ashes enrichment factor analysis (EF) showed that As, Zn and Pb concentrate mainly in fly ash from bag filter (FA), whereas the elements K and Mg presented higher enrichment in the bottom ash (BA) . All ashes presented quartz, mullite and magnetite as crystalline phases, as well as the same functional groups, related to the presence of humidity, organic matter and Si and Al compounds. XRD, XRF, TGA, FTIR, LOI and TC techniques were correlated and confirmed the obtained results. Total and external surface area values of CCBs were related to the total carbon content (TC), as well as to the results of particle size distribution and the scanning electron micrographs of the samples. On the other hand the CEC of the ashes showed relation with the particle size distribution and with the external surface area. Leaching and solubilization tests of CCBs showed that FA sample was considered hazardous and classified as class I waste, while CA and BA samples were considered non-hazardous and non-inert wastes and classified as class II-A. FA sample from Figueira power plant must be discarded only after treatment or a stringent disposal criterion must be followed to avoid contamination on site. In this work, feed coal sample was also compared to the CCBs samples generated from it. The results showed the differences between fuel and products through the different characterization techniques. In addition to contributing to the understanding of the relationship between coal and its combustion products, this work can also help to reduce the environmental impacts caused by the CCBs disposal, as well as can also be used to compare the characteristics of CCBs from FTPP with the new wastes that will be generated by the same thermal power plant that will be soon modernized.

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Section: Feed Coal Characterizationsupporting

confidence: 91%

Section: Ermal Analysismentioning

confidence: 99%

Section: Feed Coal Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Physical and Chemical Characteristics of Feed Coal and its by-products from a Brazilian Thermoelectric Power Plant

Izidoro

Miranda

Castanho

et al. 2019

J. Appl. Mat. Tech.

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“…According to the results presented, silicon oxide is a major composite of the analyzed samples, followed by aluminum, iron and potassium, which together correspond to 76% of the mass composition of ash samples. Similar values were also observed in other works, like the one carried out by Fallavena et al (2013), who analyzed coal from the south of Santa Catarina; Van Dyk et al 2009, who analyzed the coal from South Africa; and Unuma et al (1986), analyzing coal from the United States of America and in Canada. On the other hand, Song et al (2009), working with Chinese coal, observed 28% calcium oxide in ash composition; Ozbayoğlu and Özbayoğlu (2006), studying the coal from Turkey, obtained ashes containing 49.62% iron oxide, 36.85% calcium oxide and 32.95% sulfur oxide, as the maximum values after analyzing several samples.…”

Section: Characterization Of Coal Ash Samplessupporting

confidence: 87%

Use of zeolite synthesized from coal ashl from Santa Catarina for removal of iron, manganese and methylene blue dye in water

2018

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The fly ash of coal, generated in a thermoelectric plant, was used to synthesize zeolite by hydrothermal treatment with a sodium hydroxide solution. The zeolite synthesized was used as an adsorbent of metals (Fe and Mn) and of the methylene blue dye in water. The characterization of the zeolite showed that silicon oxide is the main compound in its composition, followed by aluminum, iron, sodium and calcium, which together correspond to more than 86% of its composition. These were used to investigate the kinetic parameters of adsorption and the isotherm of the metals and the methylene blue dye in aqueous solutions. Three kinetic models, pseudo-first order, pseudo-second order and intraparticle diffusion were used to predict adsorption rate constants. The adsorption kinetics of the dye and metals followed the pseudo-second order kinetics and reached equilibrium in 15 minutes with a 99% removal rate for metals, independently of the pH. The values of the diffusion constants (K2) for iron in pH 5, 7 and 8 were 1.3158; 1.3881 e 0.6053 mg.g-1.min-1 and for manganese 1.2511; 1.5239 and 1.4336 mg.g-1.min-1, respectively. For methylene blue, the removal rate was 90% and the constant (K2) value was 0.5437 mg.g-1.min-1. The studies showed the existence of different stages in the adsorption of the metals and the methylene blue dye in zeolite.

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“…), weight %. In Brazilian coals, it is observed that sulfur is predominantly in pyrite (FeS 2 ), which has iron in its composition, which can form hematite (Fe 2 O 3 ) after oxidation 29 .…”

Section: Introductionmentioning

confidence: 99%

Characterization of Fly Ash and a Protective Coating for Brazilian Thermal Power Plant Boilers

et al. 2020

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Thermoelectric power plants that use mineral coal show high wear in heat exchanger due to the action of several damage mechanisms associated with the impact of hard particles from the residue of burnt coal, the ashes. The employment of coatings should be given into consideration particularly for critical components, which are subject to severe erosive conditions is one of the solutions. However, the choice of material will depend on several factors, including the properties of aggressive ashes. This paper aims to characterize ashes generated by a Brazilian coal-based power plant and a FeCrNbNi-based metallic coating obtained by the electric arc spraying process. No trace of sulfur content was found in fly ashes and it was defined that wear is mainly related to the impact and energy of hard particles are the leading causes of degradation in coal-fired boiler equipment. According to the assessment, applied coating showed (5 ± 2)% by volume of pores and cracks, with 1.6% of oxides after the spraying process and hardness 35% greater than ash particles. Preliminary results in field operation suggest that the material showed relatively low wear compared to the original substrate and showed great applicability in controlling material deterioration for this purpose.

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Caracterização detalhada de material de referência certificado de carvão brasileiro

Cited by 12 publications

References 12 publications

Physical and Chemical Characteristics of Feed Coal and its by-products from a Brazilian Thermoelectric Power Plant

Physical and Chemical Characteristics of Feed Coal and its by-products from a Brazilian Thermoelectric Power Plant

Use of zeolite synthesized from coal ashl from Santa Catarina for removal of iron, manganese and methylene blue dye in water

Characterization of Fly Ash and a Protective Coating for Brazilian Thermal Power Plant Boilers

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