Synthesis of industrial minerals from fly ash

Querol, Xavier; Plana, F.; Alastuey, Andrés; Turiel, José Luis Fernández; Soler, Ángel López

doi:10.1016/s0167-9449(06)80210-7

Cited by 17 publications

(10 citation statements)

References 4 publications

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“…Recent studies (7,8,13,14) have obtained high Na and K-zeolite synthesis efficiencies after alkaline activation of fly ash in closed systems during relatively short activation periods (8-100 h). The results of our previous work on this subject (10,11,25) demonstrated that different zeolites can be synthesized from the same fly ash by changing the activation parameters (mainly temperature, activation agent, concentration of the activation solution, and time of activation). However, the industrial application of this process has certain limitations given the long activation periods needed for the synthesis of these materials.…”

Section: Introductionmentioning

confidence: 99%

A Fast Method for Recycling Fly Ash: Microwave-Assisted Zeolite Synthesis

Querol¹,

Alastuey²,

López-Soler³

et al. 1997

Environ. Sci. Technol.

245

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Zeolitic material was synthesized from fly ash by conventional and microwave-assisted hydrothermal alkaline activation experiments. The zeolite synthesis was studied as a function of temperature, time, and activation solution concentration. K+-Na+/NH4 + exchange properties of the zeolitic material synthesized were studied as a function of time and zeolite type. The zeolitic material synthesized from the same fly ash by changing the synthesis parameters contained: NaP1, hydroxysodalite, hydroxycancrinite, analcime, tobermorite, and nepheline hydrate using NaOH as an activation agent and F linde zeolite, kalsilite, and phil lipsite-KM zeolite from KOH activation. Synthesis yields and zeolite types obtained from the microwave and conventional experiments were very similar, but the activation time needed was drastically reduced by using microwaves (from 24−48 h to 30 min). Consequently, the industrial application of the synthesis process is enhanced by the microwave-assisted method. From this point of view, the most interesting zeolites synthesized are NaP1, KM-phillipsite, and F linde zeolites since the NH4 + retention capacities obtained for the activation products were close to 20 and 30 mg of NH4 + g-1. The experiments performed also showed that high NH4 + retention capacities are attained after a few minutes of equilibrium with NH4 +-rich solutions.

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Section: Introductionmentioning

confidence: 99%

A Fast Method for Recycling Fly Ash: Microwave-Assisted Zeolite Synthesis

Querol¹,

Alastuey²,

López-Soler³

et al. 1997

Environ. Sci. Technol.

245

View full text Add to dashboard Cite

show abstract

“…Further separation from diamagnetic lime and gypsum is easily achieved with a magnet [8]. The magnetic susceptibility of lake sediments around a large coalfired power station in Spain showed the same geographical distribution as immission profiling, caused by magnetite octahedra dendrites crystalised on aluminosilicate spheres of 10-50 um diameter in the fly ash [55].…”

Section: Formation Of Ferromagnetic Particles By Combustion Processesmentioning

confidence: 89%

Environmental aspects of trace elements in coal combustion

Sager¹

1999

Toxicological & Environmental Chemistry

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“…Samples for geochemistry analysis were crushed and ground to less than 200 mesh. Coal samples were acid digested following a two-step digestion method devised to retain volatile elements in solution (Querol et al, 1997;Zhuang et al, 2012). The resulting solutions were analyzed by inductively coupled plasma atomic-emission spectrometry (ICP-AES) for major and trace elements and by inductively coupled plasma mass spectrometry (ICP-MS) for trace elements.…”

Section: Samples and Methodsmentioning

confidence: 99%

Elemental Affinities in Coals from the Southern Qinshui Basin, North China

Zhou¹,

Qiu²

2016

Proceedings of the 2016 5th International Conference on Energy and Environmental Protection (ICEEP 2016)

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The occurrence and distribution of major, trace and rare earth elements have been investigated in two coal-bearing units in the Qinshui Basin, northern China: the Carboniferous and Permian coals. The arithmetic means of concentrations for most elements in the Carboniferous and Permian coal samples, although in a relatively low level, is present in the range of the world concentrations. The coals in the Late Carboniferous Formation are enriched in Ca, Fe, Mg and Cd, while the coals in the Early Permian are enriched in P, Ti, Ba and Nb. There are no distinct differences of Al, Na, Be and other elements in these two strata. Five groups of the elements in the Carboniferous and seven groups of the elements in the Permian may be classified according to the mode of occurrence in coals. Major differences found between the Carboniferous and Permian coals are probably related to the different depositional setting, given that the Carboniferous coals were deposited on a tidal flat, and the Permian coals were accumulated in delta plain environment.

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Synthesis of industrial minerals from fly ash

Cited by 17 publications

References 4 publications

A Fast Method for Recycling Fly Ash: Microwave-Assisted Zeolite Synthesis

A Fast Method for Recycling Fly Ash: Microwave-Assisted Zeolite Synthesis

Environmental aspects of trace elements in coal combustion

Elemental Affinities in Coals from the Southern Qinshui Basin, North China

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