Release Behavior of As, Hg, Pb, and Cd during Coal Gasification

Li, W-Y.; Liu, Zhong; Feng, Jie; Xie, K-C.

doi:10.1080/15567030802606178

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…If one considers the work of Font et al at ELCOGAS, then the influence of halides may need to be considered, particularly given the relatively high chloride content of the North Dakota lignite. Note that in a laboratory-scale fixed bed gasifier Li et al found some temperature effect on the volatility, particularly of Pb and As under a CO 2 atmosphere …”

Section: Gasification Research and Developmentmentioning

confidence: 99%

“…Note that in a laboratory-scale fixed bed gasifier Li et al found some temperature effect on the volatility, particularly of Pb and As under a CO 2 atmosphere. 196 In a related project Wagner et al investigated the overall mercury mass balance across the total Sasol petrochemical complex. 197 Whereas Bunt and Waanders had drawn their balancing envelope around the gasifier only, the wider study also determined that the mercury retention in the tar removal from the syngas was minimal (less than the ash).…”

Section: Contaminant Species In Raw Syngasmentioning

confidence: 99%

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Advances in Coal Gasification, Hydrogenation, and Gas Treating for the Production of Chemicals and Fuels

Higman¹,

2013

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Section: Gasification Research and Developmentmentioning

confidence: 99%

Section: Contaminant Species In Raw Syngasmentioning

confidence: 99%

Advances in Coal Gasification, Hydrogenation, and Gas Treating for the Production of Chemicals and Fuels

Higman¹,

2013

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“…It has been reported that Hg in soils mainly originates from industrial sources, especially petrochemical production and coal combustion [46,51,52]. Similarly, Cd also enters the environment through human activities, via exhaust gas and coal combustion emissions, owing to the stable bond between Cd and organic matter and sulfide in coal [53,54].…”

Section: Source Apportionment Of Heavy Metalsmentioning

confidence: 99%

Concentrations, Spatial Distributions, and Sources of Heavy Metals in Surface Soils of the Coal Mining City Wuhai, China

Liu

Zhang

et al. 2020

Journal of Chemistry

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Various studies have shown that soils surrounding mining areas are seriously polluted by heavy metals. In this study, 58 topsoil samples were systematically collected throughout the coal mining city Wuhai, located within the Inner Mongolia Autonomous Region of China. The concentrations of As, Hg, Cr, Ni, Cu, Zn, Cd, and Pb in these samples were measured and statistically analyzed. The mean concentrations of all heavy metals were lower than their Grade I values defined by the Chinese Soil Quality Standard. However, the mean concentrations of individual heavy metals in many samples exceeded their background values. The spatial distribution of heavy metals was analyzed by the ordinary kriging interpolation method. The positive matrix factorization model was used to ascertain contamination sources of the eight heavy metals and to apportion the contribution of each source. The most severely polluted area was the Wuhushan mine site in the Wuda district of Wuhai. Our results showed that coal mining strongly affected heavy metal contamination of the local soils. Results of source apportionment indicated that contributions from industrial activities, atmospheric deposition, agricultural activities, and natural sources were 31.3%, 26.3%, 21.9%, and 20.5%, respectively. This clearly demonstrates that anthropogenic activities have markedly higher contribution rates than natural sources to heavy metal pollution in soils in this area.

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Lead in Chinese coals: distribution, modes of occurrence, and environmental effects

Fang

Liu

Zhou

et al. 2013

Environ Geochem Health

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Lead (Pb) has gained much attention since the 1970s because of its potential and cumulative toxicity. As one of the most hazardous elements in coals, Pb can be released into the environment during coal mining, processing, and utilization. This study presents a synthesis on the abundance, distribution, modes of occurrence, and environmental impacts of Pb in Chinese coals. Using the expected coal reserves as the weighting factor and based on the previously published Pb content in 4,304 coal samples (including results obtained in our laboratory) from main coalfields or coal mines in China, the weighted mean Pb content in Chinese coals is 13.0 μg/g, which is higher than that of the American coals (11 μg/g) and average world coals (7.8 μg/g). With respect to regional distribution of Pb in Chinese coals, Pb content can be arbitrarily divided into three groups (<20, 20-40, >40 μg/g). Following this classification, coals from Tibet have the highest average Pb content (128.94 μg/g). The abundance of Pb in coals varies with coal-forming periods and coal ranks, with the late Triassic and higher rank coals having the highest Pb content, which could be ascribed to regional geochemical differences and later geological evolution as well as magma hydrothermal activities. The enrichment of Pb in coals is influenced by several geological factors, including coal-forming plants, source rocks, hydrothermal fluid, and depositional environment. Pb, dominantly associates with sulfide minerals, especially galena in coals. During coal combustion or pyrolysis, Pb is partly emitted into the atmosphere and partly partitioned to solid residues. Accumulation of Pb from coal utilization in human body could lead to a range of health problems and increase the risk of cancer.

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Release Behavior of As, Hg, Pb, and Cd during Coal Gasification

Cited by 6 publications

References 17 publications

Advances in Coal Gasification, Hydrogenation, and Gas Treating for the Production of Chemicals and Fuels

Advances in Coal Gasification, Hydrogenation, and Gas Treating for the Production of Chemicals and Fuels

Concentrations, Spatial Distributions, and Sources of Heavy Metals in Surface Soils of the Coal Mining City Wuhai, China

Lead in Chinese coals: distribution, modes of occurrence, and environmental effects

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