A comprehensive review on the applications of coal fly ash

Yao, Zhitong; Ji, Xiangling; Sarker, Prabir Kumar; Tang, Jun Hong; Ge, Lichao; Xia, Meisheng; Xi, Yao

doi:10.1016/j.earscirev.2014.11.016

Cited by 1,391 publications

(663 citation statements)

References 149 publications

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“…Fly ash is a familiar materials used as geopolymerized adsorbents. It is a complex and abundant anthropogenic material which by product of coal combustion in thermal power plants [22]. Fly ash is a waste substance that are easily to found and had been reported that could be effective for removal of heavy metals.…”

Section: Geopolymermentioning

confidence: 99%

Review on Adsorption of Heavy Metal in Wastewater by Using Geopolymer

et al. 2017

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Abstract. Rapid development of advanced technology in Malaysia gave impact increasing in the accumulation of heavy metal every day in our daily life through wastewater. Long term exposure of human bodies to heavy metals susceptible to receives various infections and diseases. From an environmental and economic perspective, adsorption is acceptable process that can be applied in wastewater treatment. However, usage of activated carbon most acknowledged and costly adsorbents lead people to find an alternative to activated carbon. Several studies of physical properties of geopolymer make them gain attention to replace an activated carbon in the treatment of heavy metal. This paper review adsorption of heavy metal by using geopolymer.

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Section: Geopolymermentioning

confidence: 99%

Review on Adsorption of Heavy Metal in Wastewater by Using Geopolymer

et al. 2017

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“…However, these compressive strength values were bellow the value found for the control mortar containing Portland cement only. In the other hand, the compressive strength of cement mortars with FA milled for prolonged time exceeded the value of the control mortar at all ages, while the UMFA mortars showed a decrease in the compressive strength bellow the reference value [10,29,30].…”

Section: Cmss-2017mentioning

confidence: 99%

“…The reactive part of fly ash is their amorphous phase which is composed mainly of silicon [8]. When mixed with Portland cement and water, fly ash induces a reaction with the calcium hydroxide released by the hydration of Portland cement to produce calcium-silicate hydrates (CSH) [9][10][11][12][13]. However, there are few limitations of the use of fly ash in cement because of the late pozzolanic reaction that starts only after 7 to 28 days [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Effect of mechanical activation of fly ash added to Moroccan Portland cement

et al. 2018

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Abstract. Nowadays, the cement industry is the largest emitter of CO 2 . In 2015, cement production accounts for roughly 8% of global CO 2 emissions. In order to reduce this impact, cement plants are working on alternative solutions, for instance, producing cement by adding additives like fly ash known for reducing the emissions of CO 2 and minimizing production costs. The thermal power stations in Morocco produce more than 500 000 tons per year. For ecological and sustainable development reasons, it is desirable to recycle these quantities according to beneficial methods to their addition in the cement. This study aims to investigate the influence of grinding fly ash on the physico-chemical and mechanical properties of fly ash blended CPJ45 cement. The addition of the fly ash particles to the grinder leads respectively to the breakage of the particles and to reduce the agglomeration effect in the balls of cement grinder. Fly ash milling was found to improve particles fineness, and increase the silica and alumina content in the cement. Furthermore, milled fly ash blended cements show higher compressive strength compared to unmilled fly ash blended cements, due to improved fly ash reactivity through their mechanical activation.

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“…The mass of fly ash generated during coal combustion is estimated to be 750 × 10 6 t globally [1,2]. Taking into account the fact that the percentage of fly ash in the total amount of ash generated is 85% [1,3], the total amount of ash generated via coal combustion is around 880 × 10 6 t. Vassilev et al [4] estimated that approximately 476 × 10 6 t of biomass ash is generated via the combustion of biomass. In total, the amount of ash generated globally is around 1.4 × 10 9 t, which is nearly equal to the mass of municipal solid waste generated globally at 1.3 × 10 9 t [5].…”

Section: Introductionmentioning

confidence: 99%

“…However, more recent statistics and recent reviews indicate that the recycling rates of fly ash are significantly higher: 46% in the USA [8], 60% in India [1], and 67% in China [1]. Primary ash recycling methods include cement and concrete production and mine backfilling [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Systematic Approach to Identifying Economically Feasible and Environmentally Benign Methods of Recycling Ash on a Regional Scale

Deviatkin¹,

Havukainen²,

Horttanainen³

2016

JRST

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This study systematically assessed and compared four ash recycling possibilities, namely forest fertilization, landfill construction, road construction, and road stabilization through the use of cost-benefit analysis and life cycle assessment methods. The results indicated that forest fertilization with ash was the most economically attractive method with a 60% increase in the net present value compared to ash landfilling, while reducing the environmental impact by 0.3%. On the contrary, road construction with ash resulted in a 13% reduction in the environmental impact and an increase in net present value of 25%. Landfill construction with ash was overall the least attractive proposition.

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A comprehensive review on the applications of coal fly ash

Cited by 1,391 publications

References 149 publications

Review on Adsorption of Heavy Metal in Wastewater by Using Geopolymer

Review on Adsorption of Heavy Metal in Wastewater by Using Geopolymer

Effect of mechanical activation of fly ash added to Moroccan Portland cement

Systematic Approach to Identifying Economically Feasible and Environmentally Benign Methods of Recycling Ash on a Regional Scale

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