Large-scale synthesis of artificial zeolite from coal fly ash with a small charge of alkaline solution

Moriyama, Ryo; Takeda, Shohei; Onozaki, Masaki; Katayama, Yukuo; Shiota, Kouji; Fukuda, Tomoya; Sugihara, Hiroaki; Tani, Yuichi

doi:10.1016/j.fuel.2005.02.026

Cited by 25 publications

(24 citation statements)

References 8 publications

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“…The phase fraction of sodalite containing impurities of zeolite A was determined by XRD measurements and increased with increasing the reaction time from 30 to 45 minutes, suggesting that sodalite is the more stable zeolite phase compared to zeolite A, which is also in agreement with the findings of Maldonado et al [17]. In most fly ash based zeolite synthesis processes, pure water as solvent for NaOH is used [18][19][20][21][22][23][24][25][26]. When Musyoka et al [27] used waste industrial brine solutions instead of pure water, hydroxy sodalite was formed in significant quantity contaminated with the remaining amount of unconverted mullite and hematite from the fly ash feedstock.…”

Section: Resultssupporting

confidence: 86%

Synthesis of Phase-Pure Zeolite Sodalite from Clear Solution Extracted from Coal Fly Ash

Hums¹

2017

J Thermodyn Catal

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The formation of zeolite sodalite (SOD) as a by-product in the synthesis of zeolite X from clear solution extracted from fused South African coal fly ash has recently been studied. However, the present study shows that zeolite X as well as zeolite A should be seen as intermediate structures and that phase-pure sodalite can be obtained by increasing crystallization time and temperature. To investigate the transition from zeolites A and X into SOD, the crystallization was conducted at 70, 80, and 90°C for different times. In addition to structural and chemical analyses by XRD and ICP, respectively, a detailed morphological characterization of the synthesis products by scanning electron microscopy (SEM) was undertaken in order to investigate the effect of the crystallization conditions on different crystal morphologies of zeolite SOD.

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Section: Resultssupporting

confidence: 86%

Synthesis of Phase-Pure Zeolite Sodalite from Clear Solution Extracted from Coal Fly Ash

Hums¹

2017

J Thermodyn Catal

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“…Unfortunately, CEC determination methodologies differ for different authors and are established for different ions, which is the source of numerous errors and makes the comparison of results difficult. Moreover, the CEC values depend on the temperature and, as shows by studies [14], also on the synthesis method and process parameters. Most often, the CEC is determined for the ions NH 4 ?…”

Section: Introductionmentioning

confidence: 91%

A simple thermogravimetric method for the evaluation of the degree of fly ash conversion into zeolite material

Majchrzak‐Kucęba

2012

J Porous Mater

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The thermogravimetry was used for the evaluation of degree of conversion of fly ash into zeolite material alongside the CEC and XRD methods being currently proposed for this purpose. The present work proposes the calculation of the thermogravimetric fly ash-to-zeolite conversion factor, CF TGA , based on the comparison of the mass loss of the commercial zeolite (standard) occurred during dehydration with that of the fly ash-derived zeolite. This mass loss is characteristic of a specific zeolite type, and the corresponding zeolite water content in the sample of zeolites indicates their degree of crystallinity and zeolite phase content. The use of the TGA method for the indirect determination of the fly ash-to-zeolite conversion factor would be preferable owing to its ''speed'' compared to other methods proposed for this purpose, as well as the capability to use a consistent procedure. Because of its short CF TGA determination procedure, the thermogravimetric method can be used for the control and determination of the quality of fly ash-derived zeolite in an industrial plant.

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“…It is more efficient than naturally available clay for contaminant removal (Leppert 1990). The mineralogy and cation exchange property of zeolites prepared from fly ash depends on the composition of the fly ash, the concentration of reacting alkali, temperature, pressure, the reaction time, and the ratio of solid: liquid (Inada et al 2005;Lin and His 1995;Mondragon et al 1990;Moriyama et al 2005;Querol et al 1995Querol et al , 1997Querol et al , 2001Querol et al , 2002Shih and Chang 1995;Singer and Bergaut 1995).…”

Section: Introductionmentioning

confidence: 99%

Reducing the Hardness of Mine Water Using Transformed Fly Ash

2010

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In the Jharia Coalfields, Dhanbad, India, huge quantities of water are pumped out of underground mines to make mining possible. The water contains high concentrations of total hardness, which makes it unsuitable for domestic use. Waste fly ash generated nearby from burning the coal in thermal power plants can be converted into a zeolitic mineral, and used to treat the mine water. The fly ash zeolite was determined to be effective in removing total hardness from the mine water. At a 40 g/L dose of fly ash zeolite, approximately 72% of the hardness was removed from the mine water. However, the mine water still requires additional treatment to further reduce total dissolved solids to make the mine water potable.

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Large-scale synthesis of artificial zeolite from coal fly ash with a small charge of alkaline solution

Cited by 25 publications

References 8 publications

Synthesis of Phase-Pure Zeolite Sodalite from Clear Solution Extracted from Coal Fly Ash

Synthesis of Phase-Pure Zeolite Sodalite from Clear Solution Extracted from Coal Fly Ash

A simple thermogravimetric method for the evaluation of the degree of fly ash conversion into zeolite material

Reducing the Hardness of Mine Water Using Transformed Fly Ash

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