Thermal decomposition of coal fly ash by concentrated sulfuric acid and alumina extraction process based on it

Bai, Guoliang; Qiao, YunHai; Shen, Bo; Chen, ShuangLi

doi:10.1016/j.fuproc.2011.01.017

Cited by 101 publications

(20 citation statements)

References 17 publications

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“…This limitation can be lifted by calcining fly ash with concentrated sulfuric acid at high temperature. Liu et al [62] and Bai et al [63] extracted alumina using an acid sinter-leach combination process. The fly ash and concentrated sulfuric acid mixture was calcined to transform most of the aluminum into aluminum sulfate, which can be extracted by hot water.…”

Section: (3) Sinter-acid Leach Combination Processmentioning

confidence: 99%

A review of the alumina recovery from coal fly ash, with a focus in China

Yao

Xia

Sarker

et al. 2014

Fuel

315

117

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Coal fly ash, an industrial by-product, is derived from coal combustion in thermal power plants. It is one of the most complex and abundant of anthropogenic materials, and its improper disposal has become an environmental concern and resulted in a waste of recoverable resources. Coal fly ash is rich in alumina, making it a potential substitute for bauxite. With the diminishing reserves of bauxite resources as well as the increasing demand for alumina, recovering alumina from fly ash has attracted extensive attentions. The present review first describes the alumina recovery history and technologies, and then focuses on the recovery status in China. Finally, the current status of fly ash recycling and directions for future research are considered.

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Section: (3) Sinter-acid Leach Combination Processmentioning

confidence: 99%

A review of the alumina recovery from coal fly ash, with a focus in China

Yao

Xia

Sarker

et al. 2014

Fuel

315

117

View full text Add to dashboard Cite

show abstract

“…6). The 3-mouth flask was controlled to 97.5°C and stirring for 1 h [32]. After that, the flask was cooled to room temperature.…”

Section: Effect Of Reaction Time On Sio 3 2− Leachingmentioning

confidence: 99%

Preparation of a novel porous adsorption material from coal slag and its adsorption properties of phenol from aqueous solution

et al. 2015

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“…This development has resulted in a sharp increase in emissions of fly ash produced by coal-fired power plants. 2 Currently, about 720 million tons of coal fly ash has been generated in China 3,4 By 2020, fly ash emissions will reach approximately 800 million tons, which is expected to cause tremendous pressure on China's national economy and environmental protection efforts. Meanwhile, the utilization rate of coal fly ash is low in China, it is generally used for construction industries, such as road construction, cement, and others.…”

Section: Introductionmentioning

confidence: 99%

Dynamic hydrothermal synthesis of xonotlite fibers by alkali silica extraction of fly ash

2019

Journal of Engineered Fibers and Fabrics

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The silica leached from coal fly ash using alkali, via the hydrothermal method, can be used as the raw material for the synthesis of xonotlite fibers through the hydrothermal synthesis method. This investigation was made to examine how the fly ash desilicated liquid influences the crystal growth and microstructure of xonotlite fibers. The obtained samples were characterized by X-ray diffraction and scanning electron microscope techniques to investigate their mineralogical composition and morphological characteristics. The results indicated that the pure desilication liquid leached from coal fly ash could be used to prepare xonotlite fibers. Xonotlite fibers with single crystal characteristics and large aspect ratio of 100–400 were successfully fabricated from fly ash desilication liquid, which is used as the silica material, at 240°C for 6 h.

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Thermal decomposition of coal fly ash by concentrated sulfuric acid and alumina extraction process based on it

Cited by 101 publications

References 17 publications

A review of the alumina recovery from coal fly ash, with a focus in China

A review of the alumina recovery from coal fly ash, with a focus in China

Preparation of a novel porous adsorption material from coal slag and its adsorption properties of phenol from aqueous solution

Dynamic hydrothermal synthesis of xonotlite fibers by alkali silica extraction of fly ash

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