Characterization of low-temperature coal ash behaviors at high temperatures under reducing atmosphere

Bai, Jin; Li, Wen; Li, Baoqing

doi:10.1016/j.fuel.2007.02.010

Cited by 112 publications

(70 citation statements)

References 18 publications

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“…Despite increasing attention on crystals in coal slags, the effects of factors such as temperature and cooling rate [4][5][6] on crystallization behavior have not been extensively studied. Several researchers [5,11] have investigated the influence of quenching temperature on crystallization of coal slags through semi-quantitative analysis of XRD to determine the volume of crystals. But more quantitative methods developed for study of other types of slags with similar composition can also be applied.…”

Section: Introductionmentioning

confidence: 99%

Influence of isothermal temperature and cooling rates on crystallization characteristics of a synthetic coal slag

Wang

Whitty

Guan

et al. 2014

Fuel

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Section: Introductionmentioning

confidence: 99%

Influence of isothermal temperature and cooling rates on crystallization characteristics of a synthetic coal slag

Wang

Whitty

Guan

et al. 2014

Fuel

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“…Upon finishing, the gas valve was shut down, and the sealing element was switched off to discharge the gas mixture. The crucibles containing the samples were then removed and immediately immersed in ice water to prevent phase transformation and crystal segregation in the ash samples [36]. Finally, the quenched samples were vacuum-dried at 105°C for 36 h and then stored in a drying cabinet.…”

Section: Preparation Of Jc Ash Samples Processed At Different Temperamentioning

confidence: 99%

“…ICP-AES provides high sensitivity and high precision (RSD < 0.5%), and is able to detect concentrations at low parts per billion to percent levels. RIR measurement is a semi-quantitative analytical method, and its calibration constant varies significantly depending on the actual phase composition [36]. Its precision was estimated as ±10% for strongly diffracting phases (e.g., gehlenite) and ±25% for weakly diffracting phases (e.g., iron oxide).…”

Section: Error Analysismentioning

confidence: 99%

Understanding mineral behaviors during anthracite fluidized-bed gasification based on slag characteristics

Huang

et al. 2014

Applied Energy

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“…There is, however, lack of information about the properties of zeolite synthesized from coal fly ash produced by gasification. In the gasification process, the coal fly ash is formatted under an inducing atmosphere, which results in the different mechanisms in mineral matter transfer and mineralogical properties of coal fly ash compared to combustion processes [24,25]. The mineralogical components in coal fly ash may affect the properties of the synthesized zeolite.…”

Section: Introductionmentioning

confidence: 99%

Zeolite Synthesized from Coal Fly Ash Produced by a Gasification Process for Ni2+ Removal from Water

et al. 2018

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There are increasing demands and great potential of coal gasification in China, but there is a lack of studies focused on the disposal and utilization of coal fly ash produced by the gasification process. In this study, a coal fly ash sample derived from a gasifier in Jincheng, China, was utilized as raw material for the synthesis of zeolite by alkali fusion followed by hydrothermal treatments. The effects of operation conditions on the cation exchange capacity (CEC) of synthesized zeolite were investigated. The synthesized zeolite with the highest CEC (270.4 meq/100 g), with abundant zeolite X and small amount of zeolite A, was produced by 1.5 h alkali fusion under 550 • C with NaOH/coal fly ash ratio 1.2 g/g followed by 15 h hydrothermal treatment under 90 • C with liquid/solid ratio 5 mL/g and applied in Ni 2+ removal from water. The removal rate and the adsorption capacity of Ni 2+ from water by the synthesized zeolite were determined at the different pH, contact time, adsorbent dose and initial Ni 2+ concentration. The experimental data of adsorption were interpreted in terms of Freundlich and Langmuir equations. The adsorption of Ni 2+ by the synthesized zeolite was found to fit sufficient using the Langmuir isotherm. More than 90% of Ni 2+ in water could be removed by synthesized zeolite under the proper conditions. We show that the coal fly ash produced by the gasification process has great potential to be used as an alternative and cheap source in the production of adsorbents.

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Characterization of low-temperature coal ash behaviors at high temperatures under reducing atmosphere

Cited by 112 publications

References 18 publications

Influence of isothermal temperature and cooling rates on crystallization characteristics of a synthetic coal slag

Influence of isothermal temperature and cooling rates on crystallization characteristics of a synthetic coal slag

Understanding mineral behaviors during anthracite fluidized-bed gasification based on slag characteristics

Zeolite Synthesized from Coal Fly Ash Produced by a Gasification Process for Ni2+ Removal from Water

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