Determination of mineral matter in Brazilian coals by thermal treatments

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

doi:10.1016/j.fuproc.2014.03.018

Cited by 19 publications

(10 citation statements)

References 24 publications

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“…All moistures and ash constituent [21] in the coal are neglected in the dry, ash-free (DAF) [22], while the presence of moisture and mineral matters in coal such as quartz, calcite, pyrite, etc are left out in dry, mineral-matter-free (DMMF ). Based on the ultimate and proximate analysis, mineral matter [23] is not directly measured but may be obtained by one of number of empirical formula. The various proximate analyses require a significant amount of laboratory equipment and is time consuming.…”

Section: Coal Proximate Analysismentioning

confidence: 99%

The Maiganga Coal Deposit: Bituminous, Sub-Bituminous or Lignite?

Ikwuagwu¹,

Uzoegbu²

2017

IOSR JAGG

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Section: Coal Proximate Analysismentioning

confidence: 99%

The Maiganga Coal Deposit: Bituminous, Sub-Bituminous or Lignite?

Ikwuagwu¹,

Uzoegbu²

2017

IOSR JAGG

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“…In situ coal reserves in Brazil total 32 billion metric tons, 89.25% in Rio Grande do Sul and 10.41% in Santa Catarina . Coal in Brazil contains on average 50% ash, consists largely of clay minerals, has a high sulfur content, and is usually classified as low-rank. − …”

Section: Introductionmentioning

confidence: 99%

Evaluation of Zeolite/Backfill Blend for Acid Mine Drainage Remediation in Coal Mine

et al. 2018

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Brazilian coal exhibits high ash and sulfur content, making it more susceptible to acid mine drainage (AMD). Furthermore, combustion of this coal generates a significant amount of ash containing amorphous silicon and aluminum oxides, allowing alkaline hydrothermal processing of this waste via zeolites. These versatile compounds have been suggested as an alternative material for AMD remediation. This study aims to evaluate the use of zeolite Na–P1 in backfill blends for application in coal mines. Laboratory scale leaching experiments were performed, and several techniques (major and trace elements, pH, and conductivity) were monitored over time, in order to assess AMD remediation and the mobilization of ions in leachates using different zeolite/tailing blends. The results indicate that the addition of zeolites, obtained from coal ash, promotes the remediation of metal content in water generated by AMD and is therefore a more beneficial process in the removal of metal ions. With regard to the 50:50 backfill/zeolite blend, reductions of 100, 98, 39, 55, 94, and 41% were observed in aluminum, iron, calcium, magnesium, zinc, and manganese content, respectively, after 7 days of leaching. The increase in pH caused by zeolite addition promoted the precipitation of both metal ions and sulfate ions. The addition of 50% or 25% of zeolite in the backfill sample increased pH from 2.36 to 8.38 or 4.66, respectively, over a leaching period of 7 days.

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“…Therefore, the HTA is not capable of evaluating the minerals and mineral transformation in raw coal. The low-temperature ash (LTA) is considered as the most efficient method to remove the organic matter of coal by ashing the coal at low temperature (<200 °C) in an electronically excited oxygen plasma. , Richaud et al compared the trace element contents in both LTA and HTA , Fallavena et al compared the mineral matter under different heat treatments with those obtained by LTA and concluded that the amount of minerals in LTA is more than that in HTA .…”

Section: Introductionmentioning

confidence: 99%

“…The low-temperature ash (LTA) is considered as the most efficient method to remove the organic matter of coal by ashing the coal at low temperature (<200 °C) in an electronically excited oxygen plasma. , Richaud et al compared the trace element contents in both LTA and HTA , Fallavena et al compared the mineral matter under different heat treatments with those obtained by LTA and concluded that the amount of minerals in LTA is more than that in HTA . LTA can give a detailed analysis of percentage of mineral matter; therefore, the mineral transformation from LTA can provide more information than HTA.…”

Section: Introductionmentioning

confidence: 99%

In Situ Minerals Transformation Study of Low-Temperature Ash

Wang

2017

Energy Fuels

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Mineral matter transformation is a specific property of coal which is crucial to the suitability during combustion or gasification. Three low-temperature ashes (LTA) were prepared by incinerating three coals at low temperature (<200 °C) in an electronically excited oxygen plasma which is considered as the most efficient method to remove the organic matter of coal. High-temperature X-ray diffraction (HT-XRD) was applied to analyze the in situ mineral transformation of LTA during the heating process with quantitative determination using the reference intensity ratio method. The fusion characteristics of the ashes were studied by ash fusion temperature test. Thermogravimetric and differential scanning calorimetry was used to acquire both the mass and heat signal from which we can analyze different reaction phases. The results show that weight loss rate reaches most in the temperature range 400–800 °C during which kaolinite decomposes and then calcite later. After 800 °C, different matters recrystallize forming new phases. Quartz remains stable until higher than 1100 °C and melted along with the new formed minerals such as anorthite and diopside under 1300 °C, while the existence of Al2O3 can result in high flow temperature. The mineral transformation is also calculated by FactSage and compared with the results from HT-XRD. The calculations of FactSage failed to give exact predictions at high temperature when there are new minerals formed during the heating process.

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Determination of mineral matter in Brazilian coals by thermal treatments

Cited by 19 publications

References 24 publications

The Maiganga Coal Deposit: Bituminous, Sub-Bituminous or Lignite?

The Maiganga Coal Deposit: Bituminous, Sub-Bituminous or Lignite?

Evaluation of Zeolite/Backfill Blend for Acid Mine Drainage Remediation in Coal Mine

In Situ Minerals Transformation Study of Low-Temperature Ash

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