Characteristics and speciation of heavy metals in fly ash and FGD gypsum from Chinese coal-fired power plants

Fu, Bojie; Liu, Guijian; Mian, Manik; Sun, Mei; Wu, Dun

doi:10.1016/j.fuel.2019.04.055

Cited by 121 publications

(66 citation statements)

References 60 publications

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“…Numerous scholars and engineers have conducted the feasibility of the above two types of solid waste utilization [14,15]. It was found that the risk assessment codes in FA posed no or low risk [16], while the heavy metals in DG showed a medium risk to the ecosystem [17]. In addition, the lime, FA, and DG were chosen as additives for investigating the solidification and stabilization of swelling soils [18].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Strength and Microstructural Characteristics of Mine Backfills Containing Fly Ash and Desulfurized Gypsum

2021

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The utilization of solid wastes (SWs) as a potential resource for backfilling is not only conducive to environmental protection but also reduces the surface storage of waste. Two types of SWs, including fly ash (FA) and desulfurized gypsum (DG), were used to prepare cementitious backfilling materials for underground mined-out areas. Ordinary Portland cement (OPC) was used as cement in mine backfill. To better investigate the feasibility of preparing backfill materials, some laboratory tests, such as uniaxial compressive strength (UCS), scanning electron microscopy (SEM), and energy dissipation theory, were conducted to explore both strength and microstructural properties of backfilling. Results have demonstrated that the main components of FA and DG in this study are oxides, with few toxic and heavy metal components. The ideal ratio of OPC:FA:DG is 1:6:2 and the corresponding UCS values are 2.5 and 4.2 MPa when the curing time are 7 days and 14 days, respectively. Moreover, the average UCS value of backfilling samples gradually decreased when the proportion of DG in the mixture increased. The main failure modes of various backfilling materials are tensile and shearing cracks. In addition, the corresponding relations among total input energy, dissipated energy and strain energy, and stress–strain curve were investigated. The spatial distribution of oxygen, aluminum, silicon, calcium, iron and magnesium elements, and hydration product are explored from the microstructure’s perspective. The findings of this study provide both invaluable information and industrial applications for the efficient management of solid waste, based on sustainable development and circular economy.

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Section: Introductionmentioning

confidence: 99%

Analysis of Strength and Microstructural Characteristics of Mine Backfills Containing Fly Ash and Desulfurized Gypsum

2021

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“…The demand for electricity is also an increasingly prevalent issue, and a thermal power plant is one of the methods to supply electricity. However, coal-fired thermal power plants create an enormous amount of bottom ash and fly ash [12][13][14][15][16][17]. Coal bottom ash (CBA) is an industrial waste produced at the bottom of a coal furnace in coal-fired thermal power plants.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Thermal Properties of High-Strength Concrete Containing CBA Fine Aggregates

Yang

Park

2020

Materials

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The thermal conductivity of concrete is a key factor for efficient energy consumption in concrete buildings because thermal conductivity plays a significant role in heat transfer through concrete walls. This study investigated the effects of replacing fine aggregates with coal bottom ash (CBA) and the influence of curing age on the thermal properties of high-strength concrete with a compressive strength exceeding 60 MPa. The different CBA aggregate contents included 25%, 50%, 75%, and 100%, and different curing ages included 28 and 56 days. For concrete containing CBA fine aggregate, the thermal and mechanical properties, including the unit weight, thermal conductivity, compressive strength, and ultrasonic velocity, were measured. The experimental results reveal that the unit weight and thermal conductivity of the CBA concrete were highly dependent on the CBA content. The unit weight, thermal conductivity, and compressive strength of the concrete decreased as the CBA content increased. Relationships between the thermal conductivity and the unit weight, thermal conductivity and compressive strength of the CBA concrete were proposed in the form of exponential functions. The equations proposed in this study provided predictions that were in good agreement with the test results. In addition, the test results show that there was an approximately linear relationship between the thermal conductivity and ultrasonic velocity of the CBA concrete.

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“…In addition, sunflower yield increased by 17.4% and 20.4% in continuous 2 years with the combined application of FGDG and straw layer, simultaneously decreasing the soil salinity and sodicity. Fu, Liu, Mian, Sun, and Wu (2019) analyzed the characteristics of heavy metals in FGDG from coal-fired power plants in China. The distribution behavior of heavy metals indicated that the content of Cr, Pb, Cd, Cu, Zn, and As in FGDG accounted for 1.26%-4.33%.…”

Section: Environmental Applicationmentioning

confidence: 99%

“…Fu, Liu, Mian, Sun, and Wu (2019) analyzed the characteristics of heavy metals in FGDG from coal‐fired power plants in China. The distribution behavior of heavy metals indicated that the content of Cr, Pb, Cd, Cu, Zn, and As in FGDG accounted for 1.26%–4.33%.…”

Section: Recycling Of Flue Gas Desulfurization Gypsum (Fgdg)mentioning

confidence: 99%

Power production waste

Cai

Zhang

Liang

et al. 2020

Water Environment Research

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The storage of large amount of power production waste occupies huge land resource; moreover, the stored or discarded waste may pollute the water environment through changing the water pH, releasing the trace and toxic elements even radioactive elements, and so on by leachate. Therefore, the recycling and disposal of power production waste are important and necessary. This paper reviews the research literatures published in 2019 on power generation waste from coal-fired and nuclear power plants, mainly including the recycling of fly ash and flue gas desulfurization gypsum in construction industry and environmental application, the recovery and immobilization of different metals from coal combustion products and selective catalytic reduction catalysts, and the treatment and disposal of radioactive elements from nuclear power plants.

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Characteristics and speciation of heavy metals in fly ash and FGD gypsum from Chinese coal-fired power plants

Cited by 121 publications

References 60 publications

Analysis of Strength and Microstructural Characteristics of Mine Backfills Containing Fly Ash and Desulfurized Gypsum

Analysis of Strength and Microstructural Characteristics of Mine Backfills Containing Fly Ash and Desulfurized Gypsum

A Study on the Thermal Properties of High-Strength Concrete Containing CBA Fine Aggregates

Power production waste

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