Investigation of elements (U, V, Sr, Ga, Cs and Rb) leaching and mobility in uranium-enriched coal ash with thermochemical treatment

Yang, Zhe; Wang, Changxiang; Liu, Danqing; Li, Yilian; Ning, Y.N.; Yang, Sen; Zhang, Yangyang; Tang, Ye; Tang, Zhi; Zhang, Wei

doi:10.1016/j.jclepro.2019.06.038

Cited by 17 publications

(11 citation statements)

References 41 publications

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“…93 The leaching rate of different trace impurities in CFA decreases in the order B ≥ 78 Sequential extraction is widely used. 94,95 Element Extraction. Dissolution in acidic solution is the easiest and simplest way to extract elements.…”

Section: ■ Elemental Extraction Techniquesmentioning

confidence: 99%

High-End Reclamation of Coal Fly Ash Focusing on Elemental Extraction and Synthesis of Porous Materials

Han

Meng

et al. 2021

ACS Sustainable Chem. Eng.

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Coal combustion accounts for a large proportion of the global energy supply due to its low cost and high heat value; however, pollution from the large amounts of coal fly ash (CFA) generated during the process causes many environmental problems. CFA has traditionally been used in construction and soil remediation, although there have been attempts to use CFA in response to the developing shortage of mineral resources. Numerous studies have investigated high-end recycling of CFA to obtain valuable products such as critical metals and porous materials, which are widely used in chemical engineering, ecological remediation, and other fields. In this study, we found that various extraction and synthesis methods summarized high value-added treatments of CFA. Dissolution and sintering processes were applied for extraction, while carbothermal and electrolysis techniques offered other unique advantages. The precursors and polymers used in the procedures were the two main factors influencing the synthesis of porous materials, providing a source of elements and inducing the formation of predictable structures. Considering the mechanisms involved, the complex methods used in state-of-the-art CFA recycling could be combed to develop high value-added CFA reclamation techniques.

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Section: ■ Elemental Extraction Techniquesmentioning

confidence: 99%

High-End Reclamation of Coal Fly Ash Focusing on Elemental Extraction and Synthesis of Porous Materials

Han

Meng

et al. 2021

ACS Sustainable Chem. Eng.

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“…Cd and Zn removal was about 100% within the pH range of 11.7-12.2. Yang et al (2019) investigated the leaching of U, V, Sr, Ga, Cs, and Rb in U-enriched coal ash after thermochemical treatment with NaOH. Under the optimal conditions: NaOH/ash ratio of 1.5, reaction temperature of 500°C and reaction time of 1 hr, the leaching of U, V, Cs, Rb, Ga, and Sr reached 92%, 100%, 74%, 78%, 41%, and 98%, respectively.…”

Section: Recycling and Disposal Of Trace Elements From Coal Combustiomentioning

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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“…We do it as an intra-comparison exercise, which is a way to compare both results and know if the determination results are precise. As aforementioned, extensive studies have been carried out on leaching of coal combustion byproducts [35,36,38]. In this paper, the European Standard leaching test EN-12457 [46] was applied to fly ash and slag samples to evaluate the leaching potential of major and trace elements.…”

Section: Sampling and Power Plant Descriptionmentioning

confidence: 99%

“…The Leaching Environment Assessment Framework (LEAF) proposed by the United States Environmental Protection Agency was adopted by Zhang et al (2019), discussing the modes of occurrence and causes of mobility of trace elements in CCPs [35]. Yang et al (2019) investigate leachate and mobility of elements in uranium-enriched coal ash with thermo chemical treatment [36]. reported that CCPs from two power plants in Xinjiang has low environmental threat, which is beneficial to the subsequent application [37].…”

Section: Introductionmentioning

confidence: 99%

“…Due to the increasing energy demand in China and large clean coal resources in Xinjiang, especially in Junggar coal field, recently, there are many coal-fired power plants near the Junggar coalfield, which produce a large amount of CCPs. The present study aims at investigating the mineralogical and environmental geochemistry of feed coals and CCPs from the Shenhuo and Yihua power plants, located in eastern Junggar coalfield, with emphasis on the study of trace elements, especially their leaching potential and partitioning behavior during combustion, in order to assess their environmental impacts and potential for further application [35,36,38].…”

Section: Introductionmentioning

confidence: 99%

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Mineralogical and Environmental Geochemistry of Coal Combustion Products from Shenhuo and Yihua Power Plants in Xinjiang Autonomous Region, Northwest China

Zhuang

et al. 2019

Minerals

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The mineralogical and geochemical characteristics of feed coals and coal combustion products (CCPs) from the Shenhuo and Yihua Power Plants in Xinjiang Autonomous Region, were studied by means of proximate analysis, Power X-ray diffraction (XRD), scanning electron microscopy with Energy Dispersive X-ray analyzer (SEM-EDX), inductively coupled plasma atomic emission spectrometry (ICP-MS) and inductively coupled plasma mass spectrometry (ICP-AES). The environmental geochemistry of CCPs was evaluated by Al-normalized enrichment factor as well as European Standard EN-12457 leaching test. Two feed coals have the characteristics of low sulfur content, medium to high volatiles matter yields, medium moisture content, super low to medium ash yield, medium to high calorific value and low mineral content. The main crystalline facies in fly ash and slag are quartz and mullite, with a small amount of calcite, and some unburned carbon. Hematite, SrSO4 and barite also can be observed in fly ashes by SEM. Typical plerophere occurs in fine fly ash rather than the coarse fly ash. The concentration of most trace elements in CCPs falls within the lower concentration range of European fly ashes. With respect to the partitioning behavior of trace elements during coal combustion, S is highly volatile, and Mg, Na, Zn, B, Co, As, Nb, Zr, Cu and K also show certain volatility, which may to some extent emit to the atmosphere. Furthermore, leaching experiments show that leachable concentrations of most of the potentially toxic elements in CCPs are low, and the CCPs fall in the range between inert and nonhazardous landfill material regulated by the 2003/33/EC Decision.

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Investigation of elements (U, V, Sr, Ga, Cs and Rb) leaching and mobility in uranium-enriched coal ash with thermochemical treatment

Cited by 17 publications

References 41 publications

High-End Reclamation of Coal Fly Ash Focusing on Elemental Extraction and Synthesis of Porous Materials

High-End Reclamation of Coal Fly Ash Focusing on Elemental Extraction and Synthesis of Porous Materials

Power production waste

Mineralogical and Environmental Geochemistry of Coal Combustion Products from Shenhuo and Yihua Power Plants in Xinjiang Autonomous Region, Northwest China

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