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The three-phase equilibrium (TPE) method measures fly ash adsorption capacity, accounting for physisorption, and chemisorption, and the equilibrium between the two, of the AEA-fly ash system. This study verifies the applicability and accuracy of the TPE method using seven fly ashes and three AEAs measured using total organic carbon …
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The traditional and effective activation method of high-alumina fly ash is alkali fusion method, which means that high-alumina fly ash is mixed with solid alkali such as NaOH, KOH, NaCO 3, Na 2 SO 4 or K 2 SiO 3 (ref. 5) evenly and roasted at high temperature to achieve the purpose of activation. 25,26 However, the process of alkali fusion is ...
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Sequential extraction is one of the most useful methods used to measure the various elements from municipal solid waste incineration ash and contaminated so … Application of methods (sequential extraction procedures and high-pressure digestion method) to fly ash particles to determine the element constituents: a case study for …
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2.2. Fly Ash Characterization The fly ash samples were air-dried for 2 to 3 days in a drying oven (Thermo Scientific Heraeus VT6060P) and mixed by the coning and quartering method, followed by obtain-ing a representative sample for analysis [31]. Mineral identification in fly ash was charac-
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The disposal of the hazardous municipal solid waste (MSW) incineration fly ash is a critical environmental issue in China and the high contents of salts in the fly ash make the ash disposal extremely difficult. The present study proposes a novel method for the salts removal from MSW incineration fly ash using molten carbonates and chlorides …
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Recently, this step-by-step procedure has been applied to bottom ash and fly ash from municipal solid waste incinerators (MSWI) to determine the distribution of elements [7], [25], [27], [28] Determining the elemental content in the fly ash requires systematic studies under the different conditions associated with the various methods.
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The ferrous and alumina extracted fly ash residue was treated with 8 M NaOH, at 95 C, in a round-bottom flask under reflux systems for 90 min by maintaining a solid-to-liquid ratio of 1:5. The leachate of sodium silicate was obtained by centrifugation at 7000 rpm for 10 min.
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where γ ′ cs (A) and γ cs represent the chemical shrinkage volume (m 3 /kg) of pastes with the FA content of A (%, by weight of binder material) and zero, under the same conditions.. Fig. 3 demonstrates an overall gradual decrease in the chemical shrinkage of pastes as the FA content increases. According to the collected test data …
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The applicable time period for the fly-ash method assessment of the erosion and deposition situation was during the last 150 years, whereas the 137 Cs method only assessed the last 50years. Land use, vegetation, erosion, and deposition may have differed during the first 100 years (1860s-1960s) of European settlement from those of the last 50 ...
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Compared to FB fly ash, GT fly ash possessed higher Cl content, higher alkalinity, and lower Si/Al content. Therefore, these distinctions in composition led to distinct behaviors of the two types of fly ash under various leaching methods. This was mainly dependent on the leachate pH and the chemical form distributions of the heavy metals.
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Reuse of the solid residue from coal fly ash alumina extraction (FAAE) by acid leaching is problematic. Conversion of this solid residue into aluminum-rich zeolite (13X) and silicon-rich zeolite (ZSM-5) was investigated in this research. The FAAE residue was activated by alkali roasting with Na2CO3 powder (110% mass fraction) at 890 °C for …
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Shen, J., Shao, X. A comparison of accelerated solvent extraction, Soxhlet extraction, and ultrasonic-assisted extraction for analysis of terpenoids and sterols in …
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A one-step microwave hydrothermal method is proposed here for the harmless treatment and resource recycling of water-washed municipal solid waste incineration fly ash (WMSWI-FA). Dioxins and heavy metals in WMSWI-FA can be detoxified, tobermorite can be synthesized by adjusting the parameters of NaOH …
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Coal fly ash (CFA) is the solid byproduct of coal power generation, ... G. Chen, Z.J. Shen, W.-P. Pan. Coal fly ash activated by NaOH roasting: rare earth elements recovery and harmful trace elements migration. ... Production of ceramic glass of low thermal conductivity by a simple method entirely from fly ash. Ceram Int, 47 (2021 ...
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3.1 Introduction. This review addresses fly ash (FA) typology, composition, treatment, deposition, recycling, functional re-use, and metals and organic pollutants abatement of FAs resulting from power and incineration plants operated either on coal and biomass, or, municipal solid waste. The emphasis of the review lies with outlining major ...
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Section snippets Materials and synthesis methods. The fly ash was from Wyoming, USA, which was firstly dried at 50 °C, and grounded to pass the 150 μm sieve, with the oxide composition listed in Table.1. The fly ash contains 52.4% silica, 26.5% alumina and small amount of other oxides, such as Fe 2 O 3, CaO, TiO 2, etc. Trona ore …
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A novel method was developed for extracting alumina (Al 2 O 3) from fly ash using an ammonium hydrogen sulfate (NH 4 HSO 4) roasting process, and the thermodynamics and kinetics of this method were investigated.The thermodynamic results were verified experimentally. Thermodynamic calculations show that mullite present in …
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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 …
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proper disposal using eco-friendly methods. Fly ash is an amorphous mixture of ferroaluminosilicate minerals generated from the combustion of ground or powdered coal at 400-1500 0C4. Fly ash also ...
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Advantages over traditional sources. While there is not a high density of REEs in fly ash – a few parts per million – the extraction process is far less intensive than that of mining raw product.
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In this paper, fiber concrete specimens with fly ash content of 0, 10%, 20%, and 30% are designed and manufactured (All the fiber contents of specimen is 0.9%), and two groups of sulfate dry–wet ...
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Fly ash (FA) is the principal industrial waste byproduct from the burning of solid fuels. FA is a powdery. solid that is constituted mostly of unburned carbon (UC), …
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Understanding the chemical state of lead in fly ash generated from a waste thermal treatment is important, since the toxicity and solubility of the element depends on its chemical state. This study identified three potential methods for obtaining quantitative information regarding the chemical state of lead in fly ash: X-ray absorption near edge …
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Thus, [8] tested the strength of fly ash-based geopolymers obtained by the wet method. The study describes the effect achieved with ratios of sodium hydroxide …
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@article{Geng2020NovelMF, title={Novel method for comprehensive utilization of MSWI fly ash through co-reduction with red mud to prepare crude alloy and cleaned slag.}, author={Chao Geng and Jianguo Liu and Shichao Wu and Yufeng Jia and Bing Du and Shuyao Yu}, journal={Journal of hazardous materials}, year={2020}, …
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Currently, there are several predominant pretreatment methods for fly ash, including alkaline sintering, alkaline leaching, and the acid-alkali combination …
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A brief account of the research pertaining to the methods employed for synthesis of fly ash zeolites, FAZ, (viz., conventional hydrothermal, fusion, microwave assisted hydrothermal, molten salts and other two stage hydrothermal ) is presented in Table 3.1.In addition, the effect(s) of variation in reaction parameters (listed in Table 3.1) …
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Fly ash and costless seawater are used to sequester CO 2 at ambient conditions.. High carbonation efficiency of up to 94.8% is obtained. • The carbonation efficiency increased with the solid/liquid and the CO 2 flow rate.. The absorbed CO 2 is converted to aragonite.. The low pH range of 8.2 ∼ 10.4 may be the key to the high …
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The disposal of fly ash requires an intermediate treatment, such as a chemical treatment, to render heavy metals insoluble. Of the heavy metals contained in fly ash, lead is present in relatively high concentrations (up to tens of thousands of mg kg–1 degree). Because of lead's toxicity, proper disposal of the treated fly ash is critical.
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Abstract and Figures. Using coal fly ash from one thermal power plant in Ningxia, China as the raw material, aluminum hydroxide powder was successfully extracted by pre-desilication, calcination ...
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