Petrological and mineralogical characterizations and chemical composition of coal ashes from power plants in Yanzhou mining district, China

Liu, Guijian; Zhang, Haoyuan; Gao, Lianfen; Zheng, Lu; Peng, Zicheng

doi:10.1016/j.fuproc.2003.10.028

Cited by 83 publications

(29 citation statements)

References 27 publications

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“…Large amount of y ash is being disposed of in opened land ll sites, creating problems with air, groundwater and soil pollution with harmful elements [4][5][6] . Recently, acid extracting alumina from y ash becomes the main development trend.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

et al. 2016

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Acid-extracting residue of circulating uidized bed (CFB) y ash is still underutilized leaving disposal problems. In fact, high silica content inside this material opens a possibility to become a potential zeolites precursor. In this study, ne particles of acid residues have been reused to prepare zeolite Na-X and Na-P with high purity and intensity. Acid residue was used to synthesize zeolite Na-X and Na-P using a single-step hydrothermal process. The effects of crystallization time, temperature and sodium hydroxide concentration on the end products were investigated. The results revealed that crystallization time and temperature determined whether or not zeolite Na-X or Na-P was formed. The zeolites were characterized in terms of their mineralogical composition, morphology, and fourier-transform infrared spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

et al. 2016

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“…From 1980 to 2011, more and more coal was produced and consumed in China (Liu et al, 2004;Vejahati et al, 2010). In 2011, about 3.6 billion tons of coal were consumed in China, accounting for nearly half of the total world coal consumption, and ranking first in the world (USEIA, 2011).…”

Section: Introductionmentioning

confidence: 99%

Content and Distribution of Trace Elements and Polycyclic Aromatic Hydrocarbons in Fly Ash from a Coal-Fired CHP Plant

Liu

Cao

2014

Aerosol Air Qual. Res.

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The levels of trace elements and polycyclic aromatic hydrocarbons (PAHs) in fly ash generated by coal combustion have received considerable attention in recent years, due to their potential environmental impact. Sixteen high priority PAHs and 14 trace elements in coal fly ash were measured. The particle sizes of fly ash showed a bimodal distribution, and most ash particles were within a range of 20-25 µm in diameter. The fly ash exhibited high contents of CaO and SO 3 , which was influenced by the desulfidation treatment of limestone. The Be, Cu, Ni, V, Se, Mo and Cd contents increased significantly with decreasing particle sizes of fly ash, while those of Zn and Pb showed no obvious trends. PAHs with three-and four-rings were the dominate species in all the fly ash. The amount low molecular weight PAHs with two-, three-and four-rings was inversely correlated with the particle sizes of the fly ash.

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“…Several factors, such as volatilization tendency of trace elements, modes of occurrence of trace elements, and concentrations of trace elements in coal gangue may influence the trace elements behavior during coal gangue combustion [63][64][65][66]. Also, the combustion condition, especially temperature is a key factor to influence the transformation behavior of trace elements.…”

Section: Transformation Behavior Of Trace Elements During Coal Ganguementioning

confidence: 99%

“…The second group is represented by Co, Cr, and V, which were relative non-volatile. It is reported that the volatility of trace elements during coal combustion mainly relies on the modes of occurrence and the concentrations in coals as well as the combustion parameters [64][65][66][67]. During coal gangue combustion, the combustion temperature and the modes of occurrence of trace elements in coal gangue are the main factors.…”

Section: Transformation Behavior Of Trace Elements During Coal Ganguementioning

confidence: 99%

Trace Elements in Coal Gangue: A Review

Guo¹

2018

Contributions to Mineralization

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Coal gangue is one of the largest industrial residues. It has high ash content, low carbonaceous content, and heating value. Meanwhile, it has some trace elements. Large quantities of coal gangue cause serious environmental problems by polluting the air, water, and soil as well as occupying a tremendous amount of land. Now, coal gangue utilization is a matter of great concern and has attracted wide interest. However, some toxic trace elements in coal gangue should be paid more attention during the utilization of coal gangue. In this article, the modes of occurrence and the leaching characters of trace elements in coal gangue were introduced according to the result of the sequential extraction method and the leaching method. The release character of trace elements during combustion of coal gangue and the environmental implication of trace elements in coal gangue were also discussed. The sulfide-bound trace elements are dominant form in coal gangue. Leaching behavior of trace elements from coal gangue is affected by many factors. Different trace elements presented different transformation behaviors. Trace elements in coal gangue could release out and produce environmental implication in various degrees, depending on the type of trace elements.

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Petrological and mineralogical characterizations and chemical composition of coal ashes from power plants in Yanzhou mining district, China

Cited by 83 publications

References 27 publications

Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

Content and Distribution of Trace Elements and Polycyclic Aromatic Hydrocarbons in Fly Ash from a Coal-Fired CHP Plant

Trace Elements in Coal Gangue: A Review

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