scholarly journals Properties of geopolymer binders prepared from milled pond ash

2017 ◽  
Vol 67 (328) ◽  
pp. 134 ◽  
Author(s):  
J. Temuujin ◽  
A. Minjigmaa ◽  
U. Bayarzul ◽  
D. S. Kim ◽  
S-Ho Lee ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Particle Size ◽  
Alkali Treatment ◽  
Amorphous Material ◽  
Thermal Power ◽  
Leaching Tests ◽  
Power Station ◽  
Pond Ash ◽  
X Ray ◽  
Alkali Activated

Alkali-activated materials were prepared from pond ash from the Darkhan city (Mongolia) thermal power station. This ash contains about 60 wt % X-ray amorphous material in addition to quartz, mullite, hematite and magnesioferrite, and presents significant storage problems since it is accumulating in large amounts and is a hazardous waste, containing 90–100 ppm of the heavy metals As, Pb and Cr, and about 800 ppm Sr. Alkali-activated materials synthesized from the as-received pond ash achieved compressive strengths of only 3.25 MPa. Reduction of the particle size by mechanical milling for up to 30 min progressively increases the compressive strength of the resulting alkali-activated geopolymer up to 15.4 MPa. Leaching tests indicate that the combination of milling and alkali treatment does not cause the release of the hazardous heavy metals from the product, making it suitable for construction applications.

MSWI fly ash particle size chemical and mineralogical characterization, before and after leaching tests, aimed to reuse. 

2021 ◽  
Author(s):  
Enrico Destefanis ◽  
Caterina Caviglia ◽  
Angelo Agostino ◽  
Davide Bernasconi ◽  
Linda Pastero ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Particle Size ◽  
Fly Ash ◽  
Waste Incinerator ◽  
X Ray Diffraction ◽  
Mswi Fly Ash ◽  
Mineralogical Characterization ◽  
X Ray ◽  
Ms Analysis ◽  
Icp Ms

<p>Municipal solid waste incinerator (MSWI) fly ash can represent a sustainable source of construction materials, but it needs to be treated in order to remove dangerous substances as chlorides, sulfates, and heavy metals. The concentration of salts and heavy metals in fly ash usually exceeds the law threshold and so they are considered a hazardous waste, unsuitable for reuse in concrete and civil engineering applications.In this work, a complete characterization of fly ash coming from a northern Italy thermovalorization plant was investigated, both on the solid and leachates composition, focused on the particle size, by X-Ray fluorescence and X-Ray diffraction on the solid matrices and ICP-MS analysis on the leachates.Using mechanical sieving on several subsamples of fly ash, six different particle size were separated and analyzed, and compared to the bulk fly ash composition.The most abundant elements are represented by Ca, Cl, S, and Si; trace elements and heavy metals are mainly represented by Zn, Fe, Al, Pb. The XRF and ICP-MS analysis show a general increasing trend, as the particle size decrease, of Na, K, Cl, S, as well as Cr, Cd, Cu, Pb, Sb, Zn, Ba, both on solid and leachates composition; on the contrary Ca and Si decrease.After leaching Cl and K decrease consistently, while it can be observed an increase of all the other elements, due to the weight loss attributable mainly to the leaching of Na-K chlorides, that is confirmed also by the X-Ray diffraction analysis.</p>

Quantitative mineralogical analysis of some Bangladesh soils with X-ray, ion exchange and selective dissolution techniques

Clay Minerals ◽  
1986 ◽  
Vol 21 (1) ◽  
pp. 31-42 ◽  
Author(s):  
A. K. M. E. Islam ◽  
E. G. Lotse
Keyword(s):  
Particle Size ◽  
Ion Exchange ◽  
Iron Oxides ◽  
Amorphous Material ◽  
Selective Dissolution ◽  
Mineralogical Analysis ◽  
Material Content ◽  
X Ray ◽  
Fine Clay ◽  
Weight Proportion

AbstractFine clay, coarse clay, and silt fractions of four Bangladesh soils were studied using XRD, ion exchange, and selective dissolution techniques. Constants for the XRD intensity-weight proportion relationships were derived using these techniques. Smectite and mica were found to be dominant in Batra and Ghior soils, whereas kaolinite and mica were dominant in the Naraibag and Ghatail soils. Other minerals present were vermiculite, vermiculite with hydroxyaluminium interlayers, chlorite, randomly interstratified chlorite-mica, feldspar, quartz, and trace amounts of amphibole. The amorphous material content varied between 1 and 11% and decreased with increasing particle size. No crystalline iron oxides were detected in untreated clay fractions.

scholarly journals Usability value and heavy metals accumulation in forage grasses grown on power station ash deposit

2015 ◽  
Vol 69 (5) ◽  
pp. 459-467 ◽  
Author(s):  
Aleksandar Simic ◽  
Zeljko Dzeletovic ◽  
Savo Vuckovic ◽  
Dejan Sokolovic ◽  
Dusica Delic ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Festuca Arundinacea ◽  
Thermal Power ◽  
Cultivated Land ◽  
Forage Grasses ◽  
Forage Production ◽  
Power Station ◽  
Vegetative Period ◽  
Nikola Tesla ◽  
Ash Deposit

The study of five forage grasses (Lolium multiflorum, Festuca rubra, Festuca arundinacea, Arrhenatherum elatius and Dactylis glomerata) was conducted on an uncontaminated cultivated land, of leached chernozem type, and on ?Nikola Tesla A? (TENT A) thermal power station ash deposit. The concentrations of: As, Pb, Cd, Zn, Ni, Fe i Cu in grasses grown on two media were compared. Grass samples have been collected in tillering stage, when they were in full development. During the vegetative period three replications cut was conducted at about 3-5 cm height, imitating mowing and grazing. The concentrations of As and Ni were elevated in media samples collected from TENT A ash deposit, while the level of all studied elements in soil samples collected from cultivated land were within allowed limits. The variance of certain elements amounts in plant material collected from TENT A ash deposit was less homogeneous; the concentrations of As, Fe and Ni were higher in grasses collected from ash deposit, but Pb and Cu concentrations were higher in grasses grown on cultivated land. The concentrations of Zn were approximately the same in plants collected from the sites, whereas Cd concentrations were slightly increased in grasses grown on ash deposit. In general, it can be concluded from the results of this study that the concentrations of heavy metals in plants collected from both sites do not exceed maximal tolerant levels for fodder. The use of grasses grown on ash deposit for forage production should be taken with reserve.

scholarly journals Physico-Chemical Peculiarities of Weighted Thermostable Plugging Materials Hydration

2021 ◽  
Vol 15 (4) ◽  
pp. 599-607
Author(s):  
Vitalii Orlovskyi ◽  
◽  
Myroslav Malovanyy ◽  
Volodymyr Biletskyi ◽  
Mykola Sokur ◽  
...  
Keyword(s):  
Fly Ash ◽  
Wide Temperature Range ◽  
Gas Permeability ◽  
Thermal Power ◽  
Cement Stone ◽  
New Materials ◽  
Power Station ◽  
X Ray ◽  
Temperature Regimes ◽  
Physico Chemical

A new competitive class of plugging compositions (weighted non-shrink plugging materials) has been created using as components a fly ash from thermal power station, a weighting additive and a superplasticizer. X-ray phase analysis identified the composition of new materials formed in the hydration process of the developed plugging compositions. The kinetic curves of the plugging material expansion in a wide temperature range have been obtained. Rational temperature regimes of plugging materials hardening according to the criteria of strength and gas permeability of cement stone have been determined.

ANALYSIS OF CROPS GROWN ON COAL-ASH TREATED SOILS

2005 ◽  
Vol 15 (03n04) ◽  
pp. 301-308
Author(s):  
VENKATATHRI VIJAYAN
Keyword(s):  
Trace Elements ◽  
Power Plants ◽  
Thermal Power ◽  
Coal Ash ◽  
Thermal Power Plants ◽  
Solid Residue ◽  
Pond Ash ◽  
X Ray ◽  
Maize Grain ◽  
Increasing Trends

Coal ash is a major component of solid residue resulting by coal-fired thermal power plants. Trace elements like Mn , Cu , Zn , As , Se , Mo and Pb in fly ash and pond ash samples collected from ten coal-fired thermal power plants in India, and crops (rice, wheat, maize grain and straw and onion bulbs) grown on coal ash treated soils at Angul, Bakreswar and Farakka sites of India have been analysed at Institute of Physics by Particle Induced X-ray Emission and Energy Dispersive X-Ray Fluorescence techniques. Our analysis shows that the concentrations of trace elements of grains are higher than in straws. Increasing trends in the uptake of micro-nutrients by the crops due to application of coal ash, were recorded, but within permissible limits.

scholarly journals Room temperature zeolitization of boiler slag from a Bulgarian thermal power plant

2017 ◽  
Vol 82 (2) ◽  
pp. 227-240 ◽  
Author(s):  
Radost Pascova ◽  
Valeria Stoyanova ◽  
Annie Shoumkova
Keyword(s):  
Power Plant ◽  
Thermal Power Plant ◽  
Textile Industry ◽  
Room Temperature ◽  
Alkali Treatment ◽  
Thermal Power ◽  
Textile Dye ◽  
Zeolite X ◽  
X Ray ◽  
Initial Slag

A simple and cost-effective method was applied for the synthesis of zeolite composites utilising wet bottom boiler slag from the Bulgarian coal-fired thermal power plant ?Sviloza?, near the town of Svishtov. The method consisted of a prolonged alkali treatment at room temperature of this waste. Experimental techniques, such as scanning electron microscopy, energy-dispersive X-ray and X-ray diffraction analyses, are employed to characterize the initial slag and the final products with respect to their morphology, and elemental and mineral compositions. The composites synthesized in this way contained two Na-type zeolite phases: zeolite X (type FAU) and zeolite Linde F (type EDI). The zeolited products and the starting slag were tested as adsorbents for a textile dye (Malachite Green) from aqueous solutions. In comparison with the initial slag, the zeolite composite possessed substantially better adsorption properties: it almost completely adsorbs the dye in much shorter times. The results of this investigations revealed a new, easy and low cost route for recycling boiler slag into a material with good adsorption characteristics, which could find different applications, e.g., for purifying polluted waters, including those from the textile industry.

scholarly journals Wavelength Dispersive XRF Study of Heavy Elements in Soil in Cancer Hit Villages of Malwa Region of Punjab, India

2019 ◽  
Vol 35 (3) ◽  
pp. 1045-1053
Author(s):  
Kirandeep Kaur ◽  
Manmohan Singh ◽  
H. S. Sahota
Keyword(s):  
Heavy Metals ◽  
Power Plant ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Heavy Elements ◽  
Fluorescence Technique ◽  
Radioactive Elements ◽  
X Ray ◽  
Low Level ◽  
Radioactive Substances

Heavy metals in the soil of 13 villages of Bathinda district, Punjab, India, were measured using wavelength dispersion X-ray fluorescence technique (WDXRF). 29 elements for which these samples were analyzed are U, Th , 40K, Pb, La, Ba, Cs, Ce,, Sn, Sb, As, Cr, Zn, Cu, Co, Sr, Zr, Sc, V, Ni, Rb, Mo,Ga, Nb, Y, Fe2O3, CaO, MnO and TiO2 . Radioactive substances like U and Th are quite low. Alkaline elements like Ca, Ba, Sr are quite high and may be acting as catalysts to low level radioactive elements. As, Fe, Co, Ni, Zr, Cr, Zn too are probably due to proximity of a thermal power plant at Bathinda and use of pesticides and fungicides for plantation.

scholarly journals Characterisation of fly ashes from 4th Thermal Power Station of Ulaanbaatar city and its applicability for a zeolite synthesis

2014 ◽  
Vol 12 ◽  
pp. 16-19
Author(s):  
J Temuujin ◽  
A Minjigmaa ◽  
B Davaabal ◽  
Z Ochirbat
Keyword(s):  
Fly Ash ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Thermal Power Station ◽  
Thermal Power ◽  
Particle Diameter ◽  
Area Measurement ◽  
Power Station ◽  
X Ray

Fly ash from 4th thermal power station of Ulaanbaatar city have been characterised by x-ray fluorescence (XRF), x-ray diffractometry (XRD), particle size analyzer, specific surface area measurement (BET) and scanning electron microscope (SEM) observation. It was found that fly ash from Baganuur coal contains over 15 wt.% of calcium oxide (CaO) and could be assigned as class C fly ash, according to the International classification. Specific surface area of this fly ash was 2.75 m2/g and mean particle diameter was 59.5 μm. Zeolitic compounds were synthesised by using mixture of this fly ash and a transition aluminium oxide under hydrothermal treatment at 100, 150 and 200°C temperatures for a different duration. Various zeolitic compounds including Na-faujasite and sodium aluminosilicate were synthesised as reaction products.DOI: http://dx.doi.org/10.5564/mjc.v12i0.164 Mongolian Journal of Chemistry Vol.12 2011: 16-19 

scholarly journals The Evaluation of the Heavy Metal Leaching Behavior of MSWI-FA Added Alkali-Activated Materials Bricks by Using Different Leaching Test Methods

2019 ◽  
Vol 16 (7) ◽  
pp. 1151 ◽  
Author(s):  
Peng Xu ◽  
Qingliang Zhao ◽  
Wei Qiu ◽  
Yan Xue
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Fly Ash ◽  
Metal Leaching ◽  
Alkali Activation ◽  
Leaching Tests ◽  
Leaching Behavior ◽  
Heavy Metal Leaching ◽  
Environmental Compatibility ◽  
Alkali Activated

Alkali-activated materials (AAMs) not only have the potential to replace cement applications in architecture and civil engineering, but also have an excellent effect on the stabilization solidification of hazardous industrial wastes. This study used two types of municipal solid waste incineration fly ash (MSWI-FA)—grate firing fly ash (GFFA) and fluidized bed fly ash (FBFA)—as AAMs brick raw materials. It is discovered from this study that AAMs bricks with different weight ratios of GFFA and FBFA can both meet the required standard of GB21144-2007 (Solid concrete brick). From the results obtained from the four leaching tests, the equilibrium pH of the leachate varies, resulting in significant differences in the leaching of heavy metals in Raw GFFA, Raw FBFA, and AAMs bricks with GFFA and FBFA. The AAMs brick with the addition of GFFA and FBFA has an alkali activation system to encapsulate heavy metals. By comparing the results obtained from the CEN/TS 14429 leaching behavior test and the four batch leaching tests, it was found that the most influential factors for the heavy metal leaching concentration are whether the heavy metal has been solidified/stabilized in the samples. GFFA and FBFA tend to have consistent characteristics after being activated by alkali to form AAMs bricks. This can be confirmed by the acid neutralization ability concentrated on a specific pH range. The results obtained from CEN/TS14429 verified that the AAMs bricks with the addition of GFFA and FBFA have excellent environmental compatibility and that it provides a comprehensive evaluation on the environmental compatibility of the test materials and products. This demonstrated that the MSWI-FA is suitable for used as alkali-activated materials and its products have the potential to be commercially used in the future.

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