Recovery of cenospheres from coal fly ash using a dry separation process: Separation estimation and potential application

Hirajima, Tsuyoshi; Petrus, Himawan Tri Bayu Murti; Oosako, Yuji; Nonaka, Moriyasu; Sasaki, Keiko; Ando, Takashi

doi:10.1016/j.minpro.2010.03.004

Cited by 76 publications

(30 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, about 20% of the fly ash generated is being used in concrete production. Other uses include soil amelioration [4][5][6], ceramic industry [7][8][9], catalysis and support for catalysis [10][11][12][13], adsorbents for removal of various pollutants [14], depth separation [15][16][17], zeolite synthesis [18][19][20] and valuable metals recovery [21][22][23]. The global average utilization rate of fly ash is estimated to be nearly 25% [24].…”

Section: Introductionmentioning

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

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.

show abstract

Section: Introductionmentioning

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

“…For many years this waste was placed in landfills, usually by hydraulic methods. According to the Central Statistical Office (Environment... 2016), about 294.1 million Mg of coal combustion waste 128 https://journals.agh.edu.pl/geol Szwalec A., Gruchot A., Mundała P., Zawisza E., Kędzior R. Żygadło & Woźniak 2009, Fenelonov et al 2010, Hirajima et al 2010, Haustein & Quand 2011, Kušnierová et al 2011, Jayaranjan et al 2014. These types of waste are also mentioned as a source of rare earth metals (Hycnar & Tora 2015, Jarosiński 2016.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical and geotechnical properties of an ash-slag mixture deposited on a landfill in terms of its use in engineering

Szwalec

Gruchot

Mundała

et al. 2017

geol

View full text Add to dashboard Cite

Coal combustion ash-slag mixtures have been deposited in landfills in Poland for decades. At the same time, there is a shortfall in the amount of available materials related to the construction and modernisation of transportation infrastructure. Thus, a typical landfill of a power station was chosen and the aim of the study was to assess the suitability of an ash-slag landfill mixture for construction engineering purposes. The following physicochemical analyses were conducted: pH, specific electrical conductivity and determination of the leachability of basic (Ca, Na, K and Mg) and trace elements (Cd, Pb, Cr, Zn and Cu). The content of selected basic and trace elements were determined in the eluates by FAAS and standard methods were applied for geotechnical analyses. The most likely conditions were assumed to the model. The mixture will not jeopardize surface water quality in terms of the concentrations of basic, hazardous or priority elements. The content of these elements also does not exceed permissible concentrations for groundwater. The conductance and pH of the eluates are in compliance with current laws. The solid mixture has favourable geotechnical parameters which are significantly dependent on moisture content. The slope stability calculations for embankments created from the mixture at optimum moisture content and high compaction (I S ≥ 0.95) indicate that they will be stable even in the case of high gradients (1:1.5). The slopes will be unstable in conditions of submersion, which should not occur if we assume the embankment will be used for passive flood protection. The mixture is particularly suitable for the purposes of earth structures, provided that they are isolated from water.

show abstract

“…The separation was carried out with rotor speed of 600, 1000, 1600, 1800 and 2200rpm. Overflow and underflow products were obtained where microspheres recovery from fly ash was the primary objective [20]. Similarly Petrus et al 2011 carried out dry separation with a closed type pneumatic separator and a micron separator for microspheres recovery [21].…”

mentioning

confidence: 99%

“…In this research brown coal fly ash is used in an improved air classifier manufactured by Hosokawa Alpine, Germany to adjust the size of fly ash particles in a way to obtain morphologically suitable fly ash particles to be used in cementitious mixes. This classifier is an optimized model of air classifier, as compared to [20] and [21] from Hosokawa company, based on the principle of forced vortex and providing better control over the size of particle with cut point of 5 µm having new feature of spiral secondary air to separate all possible fine particles within certain range from the coarse particles. The purpose of this research is to carry out dry separation of fly ash particles using air classifier to study the morphology of fly ash particles before and after separation and to determine the physical and chemical properties of separated fly ash particles.…”

mentioning

confidence: 99%

“…The purpose of this research is to carry out dry separation of fly ash particles using air classifier to study the morphology of fly ash particles before and after separation and to determine the physical and chemical properties of separated fly ash particles. Moreover dry separation of fly ash carried out by [20][21][22][23] did not consider into account the effects of adding separated fractions of fly ash in cementitious binders on their mechanical properties. Therefore this research focusses on adding the products obtained from the air classifier in cement to test for the properties of hardened separated fly ash -cement paste mixes to analyse the potential of separated brown coal fly ash to be used in cementitious composites.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Dry separation of brown coal fly ash, determination of its physical, morphological, chemical, and mechanical properties of its cementitious mixes

Haider

Bittnar²,

Ali³

et al. 2017

Period. Polytech. Civil Eng.

View full text Add to dashboard Cite

The dry separation of brown coal fly ash was carried out in this research using ultrafine air classifier. Classifiers wheel speed was increased from 2000 to 10000 rpm to obtain fine and coarse products. As the speed of classifier was increased diameter of particles decreased and particle morphology was observed on optical, electron microscopes which showed that at 10000 rpm classifiers wheel speed, average fine particles morphology changed from angular and rounded irregular slaggy particles to spherical particles. High volume cementitious mixes were prepared with fine and coarse products in which cement -60% fine products samples showed a considerable increase of compressive strength as compared to cementitious raw fly ash control samples.

show abstract

Recovery of cenospheres from coal fly ash using a dry separation process: Separation estimation and potential application

Cited by 76 publications

References 11 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

Physicochemical and geotechnical properties of an ash-slag mixture deposited on a landfill in terms of its use in engineering

Dry separation of brown coal fly ash, determination of its physical, morphological, chemical, and mechanical properties of its cementitious mixes

Contact Info

Product

Resources

About