This study investigated the possibility of recycling washed fly ash, limestone sludge, stone sludge, and iron‐oxide sludge in raw meal for producing Portland cement clinker. All of the major phase components of ordinary Portland cement (OPC)—C 3 S, C 2 S, C 3 A, and C 4 AF—were identified in each eco‐cement clinker.

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The use of fly ash based zeolites in catalysis has mostly been hindered by the lack of purity but recent studies have shown that pure phase zeolite A , , could act as an alternative to the commercially available catalysts based on zeolite A. For example, Hui and Chao applied fly ash-derived zeolite A in catalytic combustion of methane.

Composite coal fly ash solid acid catalyst in synergy with chloride for biphasic preparation of furfural from corn stover hydrolysate Author: Gong, Lei, Xu, Zi-Yan, Dong, Jin-Jun, Li, Hao, Han, Rui-Zhi, Xu, Guo-Chao, Ni, Ye Source: Bioresource technology 2019 v.293 pp. 122065 ISSN: 0960-8524 Subject:

Dec 29, 2014· The purpose of this study is to co‐sinter washed‐fly ash, limestone sludge, stone sludge, and iron‐oxide sludge to fabricate 4 types of eco‐cement clinkers. The compound raw materials were burned for 2 h at 1400°C to form the eco‐cement clinkers, all of which met the toxicity characteristic leaching procedure requirements.

Based on systematic analysis, evaluation and synthesis of a 30 000 strong data matrix generated from 213 studies from 33 countries published since 1968, this paper details the extent of research that has been undertaken and discusses the effect of fly ash (FA) on the carbonation and carbonation-induced corrosion of concrete.

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Mineralogical studies show that fly ash–lime systems without NaOH produced Al‐rich calcium silicate hydrates and a small amount of ettringite. The presence of NaOH accelerates the pozzolanic reaction of fly ash. Fly ash–lime systems with NaOH produced Al‐rich calcium silicate hydrates, calcite, meixnerite, and NaX‐type zeolite (or ...

This paper uses fly ash as raw material to prepare a new type of fly ash chelate composite adsorbent, and explores the influencing factors in the preparation process of the composite adsorbent to determine the optimal synthesis process. The adsorption performance of the heavy metal nickel ions in the simulated environment was studied.

The obtained results revealed that the fly ash was comprised of 67% aluminosilicate content that would supply a readily available source of zeolite synthesis as Si and Al precursors (Ameh et al., 2017).The SiO 2 /Al 2 O 3 ratio was found to be 2.03 and that was a good indication for zeolitization of fly ash since this ratio is suitable for the synthesis of low silica type zeolites (Majchrzak ...

The large-scale usage of fly ash in cement and concrete introduces mercury (Hg) into concrete structures and a risk of secondary emission of Hg from the structures during long-term service was evaluated. Three fly ashes were collected from coal-fired power plants and three blend cements were prepared by mixing Ordinary Portland cement (OPC) with the same amount of fly ash.

Fly ash serves a ve r y useful purpose in high stre n g t h c o n c re t e . There is considerable experience confirm i n g that the high strengths achieved by using a minimum of 10 to 15 percent fly ash by weight of the total cementi-tious content cannot be attained by using additional p o r tland cement. Fly ash provides later strength gain

Chao Luan, Changfu You, Dongke Zhang. An experimental investigation into the characteristics and deposition mechanism of high-viscosity coal ash. Fuel 2014 , 119 , 14-20.

Three mixtures of fly and bottom ash with different mixture ratios (i.e., 50, 75, and 100% fly ash content by weight) were prepared for testing. Test results indicated that ash mixtures compare ...

The relation between polycyclic aromatic hydrocarbons and organic carbon in fly ash from municipal incinerator. Journal of Environmental Science and Health . Part A: Environmental Science and Engineering and Toxicology 1993 , 28 (7) , 1495-1506.

The fly ash used for this process had a Si/Al ratio of 2.76 with amorphous constituents of 49.4%. 6.0 g of fly ash was added in 109 cm 3 of NaOH solution of 2.2 M. This mixture was pretreated by refluxing at the boiling point temperature of the solution under microwave irradiation for 60 min.

The mobility of Cd, Co, Cu, Ni, Pb, Sb, and Zn from six different coal-fired power plant fly ashes that show a wide compositional range was examined using a sequential extraction procedure in order to assess their mobility when these wastes are ponded or landfilled. The extraction sequence was as follows: (1) water extractable, (2) cation exchangeable (CH3COONH4 at pH 7), (3) surface oxide ...

A two step process for the synthesis of zeolites from coal fly ash. Fuel, 78, 1999, 1225-1230. HUI, K., CHAO, C.: Pure, single phase, high crystalline, chamfered-edge zeolite 4A synthesized from coal fly ash for use as a builder in detergents. J. Hazard. Mater. 137, 2006, 401-409. IYER, R., SCOTT, J.: Power station fly ash - a review of value ...

Jun 07, 2011· A major environmental concern associated with coal fly ash is the mobilization of trace elements that may contaminate water. To better evaluate proper use of fly ash, determine appropriate disposal methods, and monitor postdisposal conditions, it is important to understand the speciation of trace elements in fly ash and their possible environmental impact. The speciation of selenium, arsenic ...

926 Liu et al., Aerosol and Air Quality Research, 19: 925–936, 2019 and 300°C for 2 h. Wu et al. (2011) reported that fly ash constituent is a crucial factor, which can influence or dominate the destruction efficiency of dioxins in fly ash. In

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The major oxide content and mineralogy of 75 European fly ashes were examined, and the major element composition of the glass phase was obtained for each. Correlation of compositional trends with the glass content of the ash was explored. Alkali content was deduced to have a major influence on glass formation, and this in turn could be related to the probable chemistry of clay minerals in the ...

The possibility of using residual rice husk ash, a by-product of steam boilers, containing high carbon content in high volume fly ash self-consolidating concrete was investigated in this study. The concretes produced were tested for fresh and harden

fly ash is shown in Figure 1. Table 1. Physical properties of cement and fly ash Property Cement Fly ash Standard consistency 33.5% 35% Initial setting time 35 min 40 min Final setting time 160 min 250 min Soundness 1 mm 0 mm Specific gravity 3.15 2.45 Table 2. Chemical properties of fly ash Chemical composition Value (%) Loss of ignition 2.52 ...

The results revealed that the addition of 15 % Rice Husk Ash and 39% Fly Ash increased the workability of 25 % as compared to the controlled concrete. The sample containing 10 % Rice Husk Ash, 10% Waste Glass Powder and 39% micro silica produced worst workability as it decreased the workability up to 5 % of controlled concrete.

1. Introduction. Coal is a major source of energy worldwide and a large fraction (37%) of it is used in electric power generation in the US. The coal fed power plants produce tons of fly ash (FA), bottom ash, and polycyclic aromatic hydrocarbons (Harkness et al., 2015; Matzenbacher et al., 2017).Coal fly ash (CFA) is 65–95% of the total ash generated (Jayaranjan et al., 2014).

Chao Zhang's 6 research works with 34 citations and 655 reads, including: Silicon-aluminum additives assisted hydrothermal process for stabilization of heavy metals in fly ash from MSW incineration

Apr 18, 2010· Fly ash, tiếng Việt là phụ gia tro bay, là chất tồn dư của quá trình đốt cháy than. Tro bay thường được thu hồi tại các ống khói nhà máy nhiệt điện đốt than, và là một trong hai loại vật liệu thường được gọi chung là tro than (coal ash).

Catalytic ozonation of propanal at ambient temperatures (23–25 °C) was investigated by varying propanal and ozone concentrations and catalyst type. The catalysts tested included wood fly ash (WFA), magnetically separated ash, synthetic hematite and magnetite, and metal oxide nanoparticle impregnated activated carbon and peanut hull char. A power law model independent of ozone concentration ...

K.S. Hui and C.Y.H. Chao, Effects of step-change of synthesis temperature on synthesis of zeolite 4A from coal fly ash, Microporous and Mesoporous Materials, 88, 1-3, (145), (2006). Crossref