Radioisotope X-ray fluorescence analysis of some elements in fly ash of Afsin-Elbistan power plants

1996 ◽  
Vol 203 (1) ◽  
pp. 119-123 ◽  
Author(s):  
M. Ertuĝrul ◽  
M. Kobya ◽  
O. Doĝan
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
Fluorescence Analysis ◽  
X Ray

Total reflection X-ray fluorescence analysis of fly ash from Bulgarian coal-fired power plants

2015 ◽  
Vol 69 (5) ◽  
Author(s):  
Albena K. Detcheva ◽  
Svilen E. Mitsiev ◽  
Paunka S. Vassileva ◽  
Juri H. Jordanov ◽  
Metody G. Karadjov ◽  
...  
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
Coal Fly Ash ◽  
Internal Standard ◽  
Fluorescence Analysis ◽  
Total Reflection ◽  
X Ray

AbstractThe contents of Cl, Ca, K, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, As, Se, Rb, Sr, Ba and Pb in raw coal fly ash from five Bulgarian power plants were determined by total reflection X-ray fluorescence (TXRF), using gallium as the internal standard. The samples were analysed as in slurry form in Triton

scholarly journals The Role of Mineral Matter in Concentrating Uranium and Thorium in Coal and Combustion Residues from Power Plants in Poland

Minerals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 312 ◽  
Author(s):  
Henryk R. Parzentny ◽  
Leokadia Róg
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
Fluorescence Analysis ◽  
Atomic Emission ◽  
Mineral Matter ◽  
X Ray Diffraction ◽  
X Ray ◽  
Waste Storage ◽  
Upper Silesian Coal Basin

Based on the results of tests on feed coal from the Lublin Coal and Upper Silesian Coal Basin and its fly ash and slag carried out using X-ray diffraction and X-ray fluorescence analysis, atomic emission spectroscopy, and scanning electron microscopy, it was found that in feeds, coal Th is associated with phosphates and U with mineral matter. The highest Th content was found in anhedral grains of monazite and in Al-Si porous particles of fly ash of <0.05 mm size; whereas in the slag, Th is concentrated in the massive Al-Si grains and in ferrospheres. U is mainly concentrated in the Al-Si surface of porous grains, which form a part of fly ash of <0.05 mm size. In the slag, U is to be found in the Al-Si massive grains or in a dispersed form in non-magnetic and magnetic grains. Groups of mineral phase particles have been identified that have the greatest impact on the content of Th and U in whole fly ash and slag. The research results contained in this article may be important for predicting the efficiency of Th and U leaching from furnace waste storage sites and from falling dusts to soils and waters.

Quantitative X-Ray Fluorescence Analysis for Fly Ash Samples

1983 ◽  
Vol 27 ◽  
pp. 497-504
Author(s):  
Scott Schlorholtz ◽  
Mustafa Boybay
Keyword(s):  
Fly Ash ◽  
Sample Preparation ◽  
Power Plants ◽  
Fluorescence Analysis ◽  
Complex Problem ◽  
Point Of View ◽  
Fly Ashes ◽  
X Ray ◽  
Minor Elements ◽  
Minimal Sample

The disposal of fly ash from coal burning power plants is rapidly becoming an environmentally complex problem. Recently though, the attitude towards fly ash use has been changing from a disposal oriented point of view to a more rational position which considers fly ash as a resource to be recycled. One major hinderance of fly ash use has been the extreme variability of composition that exists between fly ashes produced at different power plants. This variability makes the analysis of fly ash very important.The most common methods currently used for fly ash analysis are atomic absorption or wet chemistry methods defined in ASTM C311. Both methods tend to be expensive, time consuming, and sample preparation is both tedious and critical for some elements. In this study X-ray fluorescence (QXRF) is used for the quantitative analysis of the major and minor elements found in “typical” fly ashes. The method, which is computer controlled, is quick, reliable, and requires minimal sample preparation.

scholarly journals Preparation of Synthetic Zeolites from Coal Fly Ash by Hydrothermal Synthesis

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1267
Author(s):  
David Längauer ◽  
Vladimír Čablík ◽  
Slavomír Hredzák ◽  
Anton Zubrik ◽  
Marek Matik ◽  
...  
Keyword(s):  
Fly Ash ◽  
Coal Combustion ◽  
Power Plants ◽  
Coal Fly Ash ◽  
Thermal Power ◽  
Product Analysis ◽  
Coal Combustion Products ◽  
X Ray ◽  
Wide Range ◽  
Silica Alumina

Large amounts of coal combustion products (as solid products of thermal power plants) with different chemical and physical properties cause serious environmental problems. Even though coal fly ash is a coal combustion product, it has a wide range of applications (e.g., in construction, metallurgy, chemical production, reclamation etc.). One of its potential uses is in zeolitization to obtain a higher added value of the product. The aim of this paper is to produce a material with sufficient textural properties used, for example, for environmental purposes (an adsorbent) and/or storage material. In practice, the coal fly ash (No. 1 and No. 2) from Czech power plants was firstly characterized in detail (X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy with energy dispersive X-ray analysis (SEM-EDX), particle size measurement, and textural analysis), and then it was hydrothermally treated to synthetize zeolites. Different concentrations of NaOH, LiCl, Al2O3, and aqueous glass; different temperature effects (90–120 °C); and different process lengths (6–48 h) were studied. Furthermore, most of the experiments were supplemented with a crystallization phase that was run for 16 h at 50 °C. After qualitative product analysis (SEM-EDX, XRD, and textural analytics), quantitative XRD evaluation with an internal standard was used for zeolitization process evaluation. Sodalite (SOD), phillipsite (PHI), chabazite (CHA), faujasite-Na (FAU-Na), and faujasite-Ca (FAU-Ca) were obtained as the zeolite phases. The content of these zeolite phases ranged from 2.09 to 43.79%. The best conditions for the zeolite phase formation were as follows: 4 M NaOH, 4 mL 10% LiCl, liquid/solid ratio of 30:1, silica/alumina ratio change from 2:1 to 1:1, temperature of 120 °C, process time of 24 h, and a crystallization phase for 16 h at 50 °C.

Coating Nano-Nickel Film on Cenospheres by Magnetic Sputtering Method

2013 ◽  
Vol 750-752 ◽  
pp. 2044-2047 ◽  
Author(s):  
Zheng Xu ◽  
Xiao Zheng Yu ◽  
Zhi Gang Shen
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
Particle Density ◽  
Hollow Spheres ◽  
Optical Microscope ◽  
Nickel Film ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nano Nickel ◽  
Magnetic Sputtering

The compacted even nanonickel film was coated on the surface of cenospheres of the fly ash from coal-burning power plants (3070 μm, particle density 0.3344g/cm3) which are hollow spheres with a shell consisting of quartz and mullite by magnetic sputtering technology. The optical microscope, scanning electric microscope and X-ray diffraction was use to examine the properties and the thickness of the coated nanonickel film. The results show that magnetic sputtering method is efficient to coat smooth, even and tightly combined nanonickel films on the cenospheres surface. The coated cenospheres can be widely used in industries.

Application of Coal Bottom Ash Zeolite on Lignin and Methylene Blue Adsorption

2019 ◽  
Vol 948 ◽  
pp. 26-32
Author(s):  
Galuh Yuliani ◽  
Siska Mutiara ◽  
Agus Setiabudi
Keyword(s):  
Methylene Blue ◽  
Fly Ash ◽  
Power Plants ◽  
Thermal Power ◽  
Bottom Ash ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Methylene Blue Adsorption ◽  
X Ray ◽  
Coal Bottom Ash

The amount of coal combustion byproducts, such as fly ash and bottom ash, generated by coal-based thermal power plants has been increasing at an alarming rate, hence creating huge problems on their treatments and disposals. One of the promising approaches for proper utilization of these byproducts is the conversion of fly ash and bottom ash to zeolites. In this research, zeolites wereprepared from coal bottom ash (RBA) by relatively simple and cheap conversion process using NaOH at 90°C for 24h. Prior to this, the RBA was pretreated using H2SO4 for 4h. The resulted zeolite was characterized using X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). XRD results confirmed the formation of sodium aluminosilicate hydrate predominated upon the bottom ash and NaOH 5M ratio of 1:8. XRF results also indicated the domination of Al2O3 and SiO2 in the zeolite composition. FTIR spectra showed characteristic zeolite peaks at 900-1100, 400-500 and 550-660 cm–1forSi-O, Al-O, and Si-O-Al absorptions, respectively. The synthetic zeolite was then applied as an adsorbent for lignin and methylene blue in aqueous solutions. It was found that the Qmax for lignin and methylene blue was16.13 mg/g and 34.13 mg/g, respectively. When fitted using Langmuir and Freundlich isotherm models, the methylene blue adsorption data fitted Langmuir isotherm while those of lignin fitted Freundlich isotherm. It was concluded that the chemical interaction between zeolite and methylene blue may lead to the chemisorption mechanism to prevail.

scholarly journals Dissolution kinetics of South African coal fly ash and the development of a semi-empirical model to predict dissolution

2015 ◽  
Vol 21 (2) ◽  
pp. 319-330 ◽  
Author(s):  
Lawrence Koech ◽  
Ray Everson ◽  
Hein Neomagus ◽  
Hilary Rutto
Keyword(s):  
Fly Ash ◽  
Surface Area ◽  
Power Plants ◽  
Coal Fly Ash ◽  
Dissolution Kinetics ◽  
Product Layer ◽  
Bet Surface Area ◽  
X Ray ◽  
Shrinking Core ◽  
Coal Power Plants

Wet flue gas desulphurization (FGD) is a crucial technology which can be used to abate the emission of sulphur dioxide in coal power plants. The dissolution of coal fly ash in adipic acid is investigated by varying acid concentration (0.05-0.15M), particle size (45- 150?m), pH (5.5-7.0), temperature (318-363K) and solid to liquid ratio (5-15 wt %.) over a period of 60 minutes which is a crucial step in wet (FGD). Characterization of the sorbent was done using X-ray fluorescence (XRF), X-ray diffraction (XRD), Furrier transform infrared (FTIR), scanning electron microscope (SEM) and Branauer-Emmett-Teller (BET) surface area. BET surface area results showed an increase in the specific surface area and SEM observation indicated a porous structure was formed after dissolution. The experimental data was analyzed using the shrinking core model and the diffusion through the product layer was found to be the rate limiting step. The activation energy for the process was calculated to be 10.64kJ/mol.

scholarly journals Extraction of Al-Si master alloy and alumina from coal fly ash

2017 ◽  
Vol 53 (2) ◽  
pp. 155-162 ◽  
Author(s):  
A. Liu ◽  
Z. Shi ◽  
K. Xie ◽  
X. Hu ◽  
B. Gao ◽  
...  
Keyword(s):  
Fly Ash ◽  
Master Alloy ◽  
Power Plants ◽  
Coal Fly Ash ◽  
Raw Material ◽  
Aluminothermic Reduction ◽  
Chemical Compositions ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray

Coal fly ash from coal power plants is a potential raw material for the production of alumina. An objective aluminothermic reduction method for the preparation of Al-Si master alloy and alumina from coal fly ash was investigated. The kinetic analysis using non-isothermal differential scanning calorimetry indicated that the reduction of Al6Si2O13, Fe2O3, and TiO2 by aluminum in coal fly ash occurs at 1618 K, 1681 K, and 1754 K, respectively. Moreover, the influence of reaction temperature on product composition was studied. The phases and morphologies of the products obtained by the aluminothermic reduction of coal fly ash at 1373-1773 K were analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy, respectively. The results from X-ray diffraction show that no oxide reduction has taken place at 1373 K and 1473K, the compositions of the product obtained by aluminothermic reduction of fly ash at 1573K- 1673 K are Al2O3, mullite, Al and Si, while the compositions of the product at 1773 K are Al2O3, Al, and Si. In addition, the chemical compositions of Al-Si alloy obtained at 1773 K are 86.81 wt% Al and 13.19 wt% Si.

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