:Fly AshLeaching Environmental ScienceLeaching of MetalsThe fly ash enriched in Ca, Ni and Fe showed greater leachability in acidic or ion exchangeable conditions. Principal mechanisms of metal leachability are the dissolution
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· The pre-leached fly ash exhibited lower EC values (7,400 µS) than the fresh fly ash (10,300 µS). In contrast to Fe and Pb, the elements such as Cr, Cd, Cu and Co did not leach from the fly ash. The Ca and Mn concentrations decreased with increasing temperature whereas, Na and K concentrations increased.
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· Fly ash samples from two South African coal-fired power stations were subjected to different leaching tests under alkaline and acidic conditions in an attempt to assess the effect
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· Abstract. Five leaching methods (serial batch leaching procedure (SBLP), synthetic groundwater leaching procedure (SGLP), mine water leaching procedure (MWLP), 3 TIER integrated framework leaching protocol (3TIER), and toxicity characteristic leaching procedure (TCLP)) were compared using two samples, a class F fly and a
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Fly ash usually contains a considerable amount of toxic elements that can be leached into the environment, thereby easily leading to serious contaminations. In this work, the leaching behaviors of poisonous elements including boron (B), phosphorus (P), vanadium (V), chromium (Cr), arsenic (As), selenium (Se), molybdenum (Mo), antimony (Sb), and
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· The experimental parameters of leaching tests are listed in Table 2.The flowchart of the fly ash dissolution test is shown in Fig. 2.The fly ash pre-dried at 60 C for 24 h was ground and then passed through a sieve with the size of
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The fly ash contains high concentrations of silica together with oxides of Ca, Al and Fe. The fly ash has very high organic content that was not lost during combustion (12.7%). Mg, Na, Ti, K and P content account for only 3.5%. Trace elements make up the rest of the fly ash.
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· The leaching behavior of trace elements in five fly ashes from five Chinese coal-fired power plants were obtained by conducting the new US EPA leaching test methods (LEAF) and the conventional EPA Toxicity Characteristic Leaching Procedure
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· Coal fly ash can be used in in various configurations (e.g. as cap, bottom liner, or blending) at a mine site, but comparative studies investigating their capacity to control acid mine drainage are limited. Batch and column leaching experiments were conducted to investigate the effects of fly ash-mine tailings mix ratios and system
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· Heedless disposal of oil-based fly ash contributes to the contamination of the air, water, and soil. Acid leaching of industrial solid wastes is recognized as a versatile, cost-effective, and environmentally friendly solid waste treatment approach. The present study investigated the viability of conventional leaching (CL) and microwave-assisted
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The physical and chemical characteristics of fly ash has changed significantly under ultra-low emission system and the current leaching system is no longer suitable for high
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· Leaching behavior and comprehensive toxicity evaluation of heavy metals in MSWI fly ash from grate and fluidized bed incinerators using various leaching methods: a comparative study Sci. Total Environ. , 914 ( 2024 ) , Article 169595 , 10.1016/j.scitotenv.2023.169595
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· The main lixiviant in bioleaching was shown to be gluconic acid, which was produced only in the presence of fly ash (in one-step and two-step bioleaching). Compared with chemical leaching at 1% pulp density, the fungus was more efficient in the leaching of Mn and Zn, and showed similar extraction yield for Al.
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· Coal fly ash (CFA) is a useful recycled resource for uses such as cement raw material. To manage and evaluate safety for effective utilization of CFA, the leaching concentration and amounts of toxic elements in CFA need to be determined. In this study, 38 types of CFA and aged CFA generated in Japan were used to measure the occurrence
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:Fly Ash Leaching SolutionLeaching Environmental ScienceFRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING. ：Characteristics of the stabilized/solidified municipal solid wastes incineration fly
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· The optimum alkaline leaching conditions (10 mol/L NaOH, temperature of 65 C, L/S ratio of 10 mL/g, and t of 90 min), resulting in Si and Al leaching efficiencies of 28% and 32%, respectively. Sequential alkaline-organic acid leaching process results in
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· This low level leaching reflects what might be expected under field conditions when large amount of water is used to carry ammoniated fly ash to an ash pond (50 mg l −1 at the S/L ratio of 1:10 for Ash #1008 in this study).
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· The leaching of Hg from coal ashes also have some ecological and technological significance. These FA leaching experiments for Hg have been described and summarized [6,9,21,25,27,37,44, 45].They
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BibTexEndNoteSimple TEXT FileReference Manager · Leaching of toxic components from the soil stabilized by fly ash or dumped fly ash has negative effects on subsoil, groundwater and overall environment
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· Fly ash is a hazardous byproduct of municipal solid wastes incineration (MSWI). An alkali activated blast furnace slag-based cementitious material was used to stabilize/solidify the fly ash at experimental level. The characteristics of the stabilized/solidified fly ash, including metal leachability, mineralogical characteristics and
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· In addition, under the same leaching method, grate incinerator fly ash and fluidized bed fly ash also exhibited different leaching characteristics (Long et al., 2022). However, current research on the comprehensive leaching assessment of heavy metals in MSWI FA is still insufficient, and the leaching risks of different types of MSWI FA under
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· In order to promote and broaden the utilization of fly ash as a resource, the fly ash from a 2,660-MW coal-fired power plant in Huainan (China) was investigated. The physical and chemical properties of fly ash were characterized by scanning electron microscopy, energy spectrum analysis, and XRD. The content and different forms of the
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· This study comprehensively evaluated the leaching characteristics of heavy metals from the unfired bricks produced from co-disposal of Pb–Zn mine tailings and municipal solid waste incineration fly ash using batch,
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:Fly AshLeaching Environmental ScienceFly ash usually contains a considerable amount of toxic elements that can be leached into the environment, thereby easily leading to serious contaminations.
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:Fly AshPublish Year:2018 · To address this knowledge gap of fly ash using, this article describes an experimental study of calcination and acid leaching tests with different proportions of
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· The SGLP (synthetic groundwater leaching procedure) test is particularly adequate for one-stage leaching of fly ash ( Hassett, 1994, Llorens, 1996 ). In the leaching column test, purified water was passed through the fly ash (100 g) in a vertical column with an internal diameter of 5 cm and a fillable height of 15 cm.
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DOI: 10.1016/j.jenvman.2024.121432 Corpus ID: 270520842 Evolution of physicochemical and leaching characteristics of municipal solid waste incineration fly ash in China under
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· The pre-leached fly ash exhibited lower EC values (7,400S) than the fresh fly ash (10,300S). In contrast to Fe and Pb, the elements such as Cr, Cd, Cu and Co did not leach from the fly ash. The Ca
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· Rising municipal solid waste incineration (MSWI) makes it imperative to recycle the fly ash (FA). FA can be solidified by asphalt and then applied in the asphalt road. However, little information on the metal leaching and associated with risks from asphalt solidified forms for FA is available. In the present study, metal leaching
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· Abstract. The leaching behavior of trace elements in five fly ashes from five Chinese coal-fired power plants were obtained by conducting the new US EPA leaching test methods (LEAF) and the conventional EPA Toxicity Characteristic Leaching Procedure (TCLP) test method. These were done under a range of pH values and liquid to solid ratios.
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