A review on the utilization of fly ash

This paper reviews the synthesis and the absorbing properties of the wide variety of porous sorbent materials that have been studied for application in the removal of organics, particularly in the area of oil spill cleanup. The discussion is especially focused on hydrophobic silica aerogels, zeolites, organoclays and natural sorbents many of which have been demonstrated to exhibit (or show potential to exhibit) excellent oil absorption properties. The areas for further development of some of these materials are identified.

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Porous Materials for Oil Spill Cleanup: A Review of Synthesis and Absorbing Properties

A review of the multi-component utilisation of coal fly ash

Synthesis of zeolites from coal fly ash: an overview

Inorganic molecular sieves: Preparation, modification and industrial application in catalytic processes

Synthesis of zeolites from fly ash at pilot plant scale. Examples of potential applications

This study focuses on the synthesis at a pilot plant scale of zeolitic material obtained from the coal fly ashes of the Teruel and Narcea power plants in Spain. After the optimisation of the synthesis parameters at laboratory scale, the Teruel and Narcea fly ashes were selected as low and high glass fly ashes. The pilot plant scale experiments were carried out in a 10 m3 reactor of Clariant SA (Barcelona, Spain). The results allowed obtaining 1.1 and 2.2 tonnes of zeolitic material with 40 and 55% of NaP1 content, in two single batch experiments of 24 and 8 hours, for Teruel and Narcea fly ashes, respectively. The cation exchange capacities (CEC) of the final product reached 2.0 and 2.7 meq g-1 for Teruel and Narcea zeolitic material, respectively, which are very close to the usual values reached by the high quality natural zeolitic products. Finally, with the aim of testing possible applications of the commercial NaP1-IQE and pilot plant NaP1-Narcea zeolitic products in water decontamination, efficiency for metal uptake from waste waters from electroplating baths was investigated

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Synthesis of high ion exchange zeolites from coal fly ash

The compositional similarity of fly ash to some volcanic material, precursor of natural zeolites, was the main reason to experiment the synthesis of zeolites from this waste material by Holler and Wrishing. Since this initial studies, many patents and technical articles have proposed different methods for the synthesize this mineral from fly ash, and different applications of the zeolitic product. Although all these methods are based on an hydrothermal alkaline conversion of fly ash, the following types of processes may be used:

/pdf/synthesis-of-zeolites-from-fly-ash-in-a-pilot-plant-scale-20pcxawf4p.pdf

Alejandro Medinaceli

Papers

Synthesis of zeolites from fly ash at pilot plant scale. Examples of potential applications

Synthesis of high ion exchange zeolites from coal fly ash

Synthesis of Zeolites from Fly Ash in a Pilot Plant Scale. Examples of Potential Environmental Applications