Fly ash based zeolites for the removal of heavy metal ions were used by Solanki et al. [17]; the synthesized zeolite obtained has high removal efficiency of Cu 2+ up to . In addition to the synthetic zeolites, Gabai et al. [18] tested the adsorption capability of chelating resins and activated carbons for Cu 2+ removal.
The chloride salts in fly ash are mainly soluble and washing is an effective method to remove soluble chloride salts from fly ash (Anastasiadou et al., 2012; Colangelo et al., 2012; Hartmann et al ...
A commercial flotation plant with a handling capacity of 110 ton coal fly ash (dry basis) per hour was set up. Using the optimum operational parameters, a clean ash with loss on ignition (LOI) of 3.08% and a removal rate of unburned carbon (RUC) of 80.41% was obtained. The calorific value of the unburned carbon products reached …
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With the prescription of Al2O3/SiO2 molar ratio of 0.32, sintered at 1400 °C for 6 h and chemically leached with HF solution to remove glass matrix in the products, …
The mineral composition of fly ash promotes the synthesis of zeolites, which are subsequently used in the treatment of wastewater. The composition of fly ash namely SiO 2, Al 2 O 3, and Na 2 O are enhanced to 88.01% through pre-treatment of original fly ash using HCl of 20% wt. and solid/liquid ratio of 20 during zeolite synthesis. The pre ...
Removal of Iron From Fly Ash for Ceramic and Refractory Applications. January 1999; Magnetic and Electrical Separation 10(1) ... 67% SiO2, 1.7% Fe2O3 could be achieved with 63% recovery. This ...
The particle size distributions of MSWI fly ash samples are reported in Fig. 1.It is seen that in all the cases, particle size ranges between 1 and 100 μm.The differences among the three distributions can be inferred from the values of the typical diameters d 10, d 50 and d 90 reported in Fig. 1.Such differences do not seem large enough to severely …
SEFA Fly Ash Sales has been serving customers for more than four decades and now serves over 800 concrete plants in 13 states. Since 1976, SEFA has developed technical expertise in the functional performance of fly ash in virtually every situation, evaluating the best mixtures for particular applications and for differing weather conditions.
Soluble salt removal from MSWI fly ash and its stabilization for safer disposal and recovery as road basement material Waste Manag. 2012 Jun;32(6):1179-85. doi: 10.1016/j.wasman.2011.12.013. Epub 2012 Jan 13. Authors F Colangelo 1, R Cioffi, F Montagnaro, L Santoro. Affiliation 1 Department of ...
Converting coal fly ash waste into an adsorbent for the removal of ammonia nitrogen is an effective approach. Chemically treated highly porous converted coal fly ash was prepared through hydrothermal synthesis with hydroxide acting as an alkali source for ammonia nitrogen removal from wastewater. The highly porous converted coal fly ash …
Fly ash from different coal power plants were evaluated as phosphate sorbents. • Sorption proceeds as a combination of dissolution of CaO(s) and brushite formation. • Formation of insoluble Ca-phosphates with limited fertilizing properties is avoided. • Higher P-loadings were obtained at pH values of 8 for both fly ash samples. •
Moreover, Zeolite P1 obtained from fluidized bed fly ash (FA) through a process of solvent-free was used in the removal of ammonium from water [71]. At temperatures of 298, 308 and 318 K, the determined thermodynamic Δ G values were −2.60, −2.37 and −1.99 kJ/mol respectively.
A low-cost and simple method was proposed to synthesize SiO2–Al2O3 composite aerogel from fly ash by alkali fusion-acid leaching-ambient pressure drying process just in 3 days for the first time. The effect of the leaching solution's pH value upon micro-structure and properties of the as-prepared SiO2–Al2O3 composite aerogel was …
This study reviews different technologies for extraction of heavy metals from fly ash. With this perspective processes like bioleaching using microbes, carrier in pulp …
2.2. Experimental procedure2.2.1. Preparation of fly ash-derived mesoporous materials. PC fly ash and K 2 CO 3 powders were mixed and ground at 1:0.5 by mass ratio, which was placed in the muffle furnace (DC-B, Beijing Duchuang Technology Co. Ltd., China) and calcined at 850 °C for 2 h. The activated fly ash could be obtained …
Abstract A facile and green approach to extract silica from the coal fly-ash waste is extremely critical for environmental sustainability and economically suitable. In this study, we have used acid-alkali coupled approach to improvised the proficiency of the extraction process. The sodium hydroxide (NaOH) soaking results the formation of the …
In order to meet the increasing energy demand and to decrease the dependency on coal, environmentally friendly methods for fly ash utilization are required. In this respect, the priority is to identify the fly ash properties and to consider its potential as raw material in the obtaining of high-value materials. The physico-chemical and …
The lead removal efficiency of both raw coal fly ash and the synthesized geopolymer was compared at the given conditions: pH = 5; C 0 = 100 ppm; and t = 120 min. It was found that the removal efficiency for both raw fly ash and the geopolymer was 39.87% and 90.6%, respectively.
Silica extracting from fly ash (FA) becomes a key technology for its comprehensive utilization of waste. Here, high-purity SiO 2 was extracted from FA via …
As shown in Fig. 2 a, a significant amount of Cl could be extracted by a water-washing treatment, reaching extraction rates of 88%, 90%, and 96% for CQ, QD, and TJ ash, respectively. This removal efficiency is generally consistent with previous results (Jiang et al., 2009, Colangelo et al., 2012, Kinnarinen et al., 2013, Cao et al., …
Request PDF | Extraction of silica from fly-ash and fabrication of silica-clay composite for dye removal and kinetic studies | A facile and green approach to extract silica from the coal fly-ash ...
Amino-functionalized fly ash based tobermorite (NH2-FAT) was prepared via a two-step process including a hydrothermal preparation of fly ash based tobermorite (FAT) from fly ash (FA) and the impregnation of 3-aminopropyltriethoxysilane (APTES). The characteristics of FA, FAT, and NH2-FAT were systematically measured. The removal …
The results proved that the reduction capability of NaBH4 for Cr(VI) could be improved by adding fly ash leachate. The removal of 100 mg/L Cr(T) in the absence …
This is where Xylem stands apart. With our integrated approach to coal ash ponds, we can help you reduce both your risk and your expenses. Industrial-strength thinking makes a …
Alumina (Al2O3) extraction from circulating fluidized bed (CFB) fly ash (CFBFA) is one of the most important pathways for value-added utilization. However, in CFBFA, impurity iron (Fe) normally coexists, resulting in complicated separation processes, low Al2O3 extraction efficiency, and substandard Al2O3-based products. How to …
Solid-state conversion of fly ash to an amorphous aluminosilicate adsorbent (geopolymer) has been investigated under different conditions and the synthesised material has been tested for Cu 2+ removal from aqueous solution. It has been found that higher reaction temperature and Na:FA ratio will make the adsorbents achieving higher …
China is the largest coal consumer around the world, and coal accounts for more than 60% of the country's energy mix (Peng et al. 2018; Wang et al. 2019).Coal fly ash (CFA), a solid waste produced by coal-fired thermal power plants during the combustion of pulverized coal, is currently one of the largest solid wastes in China (Yao …
2.2.2. Characterization of chitosan modified fly ash buoyant cenospheres (FABC@CTS) The various FABC@CTS samples underwent a comprehensive suite of characterizations to analyze their chemical structure, surface morphology, and charge properties, crucial for understanding their interaction with algal cells and their efficiency in algal removal.
Fig. S3 compares the XRD patterns of raw fly ash and ash residues after reaction. The peaks regarding ash containing NaCl, KCl and CaSO 4 were hardly found in the XRD patterns of ash residues after reaction. Combined with the concentration of Cl − and SO 4 2− in the middle-layer salts (in Fig. 1), molten carbonates were confirmed to …
1. Introduction. Coal fly ash (CFA) consists of fine particles output from a coal-fired furnace at a power station (Lekgoba, Ntuli, and Falayi, 2020).Large amounts of CFA are produced by coal-fired power stations every year, especially in countries where fossil fuel-derived energy is prevalent (Guo et al., 2017; Matjie et al., 2005; Yadav and …
Fly Ash has a great capacity for agricultural usage. Its mineral characteristics can improve soil health and harvest properties. By mixing soil with up to 50% fly ash, the texture density and water capacity can be enhanced as well as acidity (or alkalinity), due to the hydroxide and carbonate salts found in fly ash. This will also provide crops with sufficient nutrition.
A further detailed leachate tests is still needed before scaling-up of the fly ash zeolitization process. 4. Conclusions. Zeolite P1 was successfully synthesized from fly ash via a solvent-free method in a trace water system. The conversion process from glassy phase of fly ash into zeolite is eco-friendly for implementation at larger scales.
Other scholars conducted washing experiments for MSWI fly ash to remove chlorides and a method of taking advantages of solubility difference in ethanol to recover these chlorides was developed which meant that large quantities of chlorides in MSWI fly ash could be removed[11]. ... Composition MSWI fly ash CaO 23.12 SiO2 18.64 CaCl2 …
The major chemical constituents of the AFA, NaAZ and SMZ20 are presented in Table 1, analyzed using the XRF technique.The results of XRF indicate that the AFA falls under class F, as the combined content of SiO 2, Al 2 O 3, and Fe 2 O 3 exceeds 70% (Bukhari et al., 2015).The low loss on ignition (LOI) value indicates a …