Effect of Coal Fly Ash as Additive on the Sulfur Retention of Coal Briquette

2012 ◽  
Vol 512-515 ◽  
pp. 1583-1588
Author(s):  
Yan Xia Guo ◽  
Yu Ting Li ◽  
Fang Qin Cheng ◽  
Feng Ling Yang
Keyword(s):  
Fly Ash ◽  
High Temperatures ◽  
Coal Combustion ◽  
Coal Fly Ash ◽  
Clean Coal ◽  
Sulfur Containing ◽  
Sulfur In Coal

Clean coal briquette is one of the most effective techniques to remove SO2 from coal combustion by using sulfur-retention agent to retain sulfur in coal residuals. Ca(OH)2 has been proved to be an effective sulfur-retention agent. CaSO4 as the primary sulfur-containing product, however, is thermal unstable at high temperatures. It has been reported that SiO2, Al2O3, Fe2O3 etc. are excellent sulfur retention additives, those are abundant in coal fly ash. In this study coal fly ash was used to the additive to improve the sulfur retention of coal briquette. The results showed that the addition of coal fly ash can improve the sulfur retention. The modified coal fly ash obtained by calcinations assisted with Ca(OH)2 can improve the sulfur retention more noticeable. The SEM and XRD results further indicated that coal fly ash promoted the formation of the sulfur-containing products such as Ca-Si-S-O compounds with high thermally stability.

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.

scholarly journals Analysis of Content of Selected Critical Elements in Fly Ash

2016 ◽  
Vol 62 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Dorota Makowska ◽  
Faustyna Wierońska
Keyword(s):  
Fly Ash ◽  
Coal Combustion ◽  
Power Plants ◽  
Raw Materials ◽  
Coal Fly Ash ◽  
New Mineral ◽  
The European Union ◽  
Cobalt Chromium ◽  
Critical Elements ◽  
Potential Source

AbstractPursuant to the new mineral policy of the European Union, searching for new sources of raw materials is required. Coal fly ash has long been considered as a potential source of a number of critical elements. Therefore, it is important to monitor the contents of the critical elements in fly ash from coal combustion. The paper presents the results of examinations of the contents of selected elements, i.e. beryllium, cobalt, chromium and germanium in fly ash from Polish power plants. The results of the conducted investigations indicate that the examined ash samples from bituminous coal combustion cannot be treated as a potential source of the analysed critical elements. The content of these elements in ash, though slightly higher than their average content in the sedimentary rocks, is, however, not high enough to make their recovery technologically and economically justified at this moment.

scholarly journals State analysis of sulfur in coal fly ash and its comparison with quantity of sulfate ion in leaching solution.

1985 ◽  
Vol 34 (5) ◽  
pp. 264-268 ◽  
Author(s):  
Yutaka BAN ◽  
Ikuo WATANABE ◽  
Keiichi FURUYA ◽  
Hidetsuru MATSUSHITA ◽  
Yohichi GOHSHI
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Sulfate Ion ◽  
Leaching Solution ◽  
Sulfur In Coal ◽  
State Analysis

Microvolume Analysis of Fly Ash by Synchrotron Radiation X-ray Fluorescence (SRXRF) and Electron Microprobe X-ray Microanalysis (EPXMA)

1989 ◽  
Vol 33 ◽  
pp. 673-678
Author(s):  
Sz. Török ◽  
Sz. Sándor ◽  
H. Rausch
Keyword(s):  
Fly Ash ◽  
Coal Combustion ◽  
Coal Fly Ash ◽  
Chemical Characterization ◽  
Particulate Material ◽  
Toxic Trace Elements ◽  
X Ray ◽  
Toxicological Effects ◽  
Physical And Chemical

The assessment of the potential environmental and toxicological effects of particulate material emitted to the atmosphere requires detailed physical and chemical characterization of the particles. One of the most widely studied types of pollutant particles is coal fly ash as a byproduct of coal combustion. These particles are inhomogeneous, highly variable, span a broad range of sizes and have diverse morphologies.It has been shown that numerous toxic trace elements tend to increase in bulk concentrations with decreasing particle size (1).

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