Investigation of characteristics and leaching behavior of coal fly ash, coal fly ash bricks and clay bricks

Gupta, Nidhi; Gedam, Vidyadhar V.; Moghe, C. A.; Labhasetwar, Pawan

doi:10.1016/j.eti.2017.02.002

Cited by 44 publications

(12 citation statements)

References 19 publications

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“…To satisfy the increasing demands for electric power, the coal power plants are vital, but they also emit a large amount of fly ash and are among the causes of environmental problems, especially, the pollution related to coal fly ash. Currently, coal fly ash is used for various purposes: brick-making, landfilling, construction, soil amendment, and others [1][2][3][4]. However, effective end uses are possible only if a comprehensive characterization of fly ash produced at the plant can be carried out [5,6].…”

Section: Introductionmentioning

confidence: 99%

Composition and Morphology Characteristics of Magnetic Fractions of Coal Fly Ash Wastes Processed in High-Temperature Exposure in Thermal Power Plants

Bui

Kalantar

et al. 2019

Applied Sciences

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Coal-fired power stations are one of the primary sources of power generation in the world. This will produce considerable amounts of fly ash from these power stations each year. To highlight the potential environmental hazards of these materials, this study is carried out to evaluate the characterization of fly ashes produced in thermal power plants in northern Vietnam. Fly ash was firstly fractionated according to size, and the fractions were characterized. Then, each of these fractions was analyzed with regard to their mineralogical features, morphological and physicochemical properties. The analytical results indicate a striking difference in terms of the characteristics of particles. It was found that magnetic fractions are composed of magnetite hematite and, to a lower rate, mullite, and quartz. Chemical analyses indicate that the non-magnetic components mainly consist of quartz and mullite as their primary mineral phases. As the main conclusion of this research, it is found that the magnetic and non-magnetic components differ in terms of shape, carbon content and mineralogical composition. In addition, it was found that magnetic components can be characterized as more spheroidal components compared to non-magnetic ones. This comprehensive characterization not only offers a certain guideline regarding the uses of different ash fractions but it will also provide valuable information on this common combustion process.

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Section: Introductionmentioning

confidence: 99%

Composition and Morphology Characteristics of Magnetic Fractions of Coal Fly Ash Wastes Processed in High-Temperature Exposure in Thermal Power Plants

Bui

Kalantar

et al. 2019

Applied Sciences

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“…However, this raw material contains hazardous substances such as heavy metals. Even though their content is below upper limit [13], non-degradable heavy metals tend to accumulate, upon being leached, and thereby impose a severe threat to the environment [18][19][20]. Inhibition of leaching mechanisms and of heavy metals isolation within composite's microstructure is accomplished by employment of a component with sorption ability [21,22].…”

Section: Introductionmentioning

confidence: 99%

Thermal and mechanical behavior of composite mortars containing natural sorptive clays and fly ash

et al. 2019

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Mineral additives are extensively applied as cement replacement materials in both construction concrete and mortar. Fly ash is one of the most commonly utilized additives which improve rheological properties, as well as thermal and mechanical behavior of mortar, and as such it has been widely investigated. This industrial byproduct comprises heavy metals in its composition; therefore further research is needed to optimize its effective dosage. Moreover, certain sorptive clays, such as natural zeolite and bentonite, can prevent migration of toxic elements from fly ash by immobilizing them in their structure. Ten experimental mortars are prepared with Portland cement, river sand and addition of fly ash, zeolite and/or bentonite in accordance with chemometric experimental design rules. The aim of the study was to investigate the effect of mineral additives on thermal and mechanical performances of mortar. Thermal characteristics were monitored via dilatometric analysis and DTA method. Principal component analysis was used on the results of physico-mechanical testing (workability, bulk density, water absorption, shrinkage, compressive and flexural strength) to enable the divisions of the observed samples into groups in the factor space. The performance of Artificial Neural Network was compared with the experimental data in order to develop rapid and accurate method for prediction of mechanical parameters of mortar. The ANN model showed high overall prediction accuracy (r 2 = 0.989, during training cycle). The test results indicate that incorporation of the mineral additives gave cost effective mortars with sufficiently good properties. However, tools of analytical modeling highlighted mortar with zeolite and fly ash as the optimal composition regarding its mechanical performance.

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“…Majority of the coal ash are being disposed in ash ponds and lagoons that can pose environmental and health risks [4,[7][8][9]. Due to massive amount of coal ash generated, it is considered as secondary material for different applications such as brick production, mine filling, drainage media, replacement for conventional soil and gravel for road side embankment, road construction, structural fill and various cement-based composites including concrete and mortar [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…In the recent years, green technologies are significant in addressing issues on environmental pollution such as biological leaching or bioleaching [10,13]. Bioleaching is an ecological friendly process of using microorganism to extract soluble material from secondary resources via the production of organic or inorganic acids [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Bioleaching of trace metals from coal ash using local isolate from coal ash ponds

et al. 2018

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Bioleaching of chromium, copper, manganese and zinc from coal ash were investigated using isolates from coal ash ponds particularly Psuedomonas spp. Six (6) different coal ash ponds were examined however, after initial screening Psuedomonas spp. were only present in three (3) coal ash ponds. Among the three coal ash ponds, results showed that eight (8) putative Pseudomonas spp. isolates were present that were identified using the Polymerase Chain Reaction (PCR). Using the eight putative Pseudomonas spp. for bioleaching at optimum conditions and 15 days, the pH value ranges from 8.26 to 8.84 which was basic in nature. Moreover, the maximum metal leached were 8.04% Cr, 12.05% Cu, 4.34% Mn and 10.63% Zn.

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Investigation of characteristics and leaching behavior of coal fly ash, coal fly ash bricks and clay bricks

Cited by 44 publications

References 19 publications

Composition and Morphology Characteristics of Magnetic Fractions of Coal Fly Ash Wastes Processed in High-Temperature Exposure in Thermal Power Plants

Composition and Morphology Characteristics of Magnetic Fractions of Coal Fly Ash Wastes Processed in High-Temperature Exposure in Thermal Power Plants

Thermal and mechanical behavior of composite mortars containing natural sorptive clays and fly ash

Bioleaching of trace metals from coal ash using local isolate from coal ash ponds

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