Mercury isotope signatures of a pre-calciner cement plant in Southwest China

Li, Xinyu; Chen, Ji; Tang, Li; Wu, Tingting; Fu, Chengcheng; Li, Zhonggen; Sun, Guangyi; Zhao, Huifang; Zhang, Leiming; Li, Qiuhua; Feng, Xinbin

doi:10.1016/j.jhazmat.2020.123384

Cited by 17 publications

(16 citation statements)

References 44 publications

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“…The dominant production technique for cement in China has changed from using shaft kilns before 2000 to precalciner kilns, or suspension pre-heater kilns, since 2010 . Guizhou Province in Southwest China is one important cement production base in China due to its rich limestone and coal deposits, and the cement output in this province has increased by 7 times during 2005–2018 and accounted for 5% of the national total in 2018. − Our previous studies revealed the distinctive Hg emission levels from different precalciner CPs in Guizhou and found Hg was enriched and accumulated inside the clinker production process and Hg isotope signals of this source was different from other important sources, for example, non-ferrous smelters. , In this study, three precalciner CPs (CP #1, CP #2, and CP #3) in Guizhou Province are systematically investigated; these three CPs all have a preheater and precalciner process and with a capacity of 4500–5000 tonnes clinker each line per day; the basic information of the instigated CPs is shown in Table S1. All input/output solid materials in the entire production process had been collected and analyzed, and the sampling locations are illustrated in Figure .…”

Section: Introductionsupporting

confidence: 61%

“…23 − 25 Our previous studies revealed the distinctive Hg emission levels from different precalciner CPs in Guizhou and found Hg was enriched and accumulated inside the clinker production process and Hg isotope signals of this source was different from other important sources, for example, non-ferrous smelters. 7 , 26 In this study, three precalciner CPs (CP #1, CP #2, and CP #3) in Guizhou Province are systematically investigated; these three CPs all have a preheater and precalciner process and with a capacity of 4500–5000 tonnes clinker each line per day; the basic information of the instigated CPs is shown in Table S1 . All input/output solid materials in the entire production process had been collected and analyzed, and the sampling locations are illustrated in Figure 7 .…”

Section: Introductionmentioning

confidence: 99%

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Fate of Lead and Cadmium in Precalciner Cement Plants and Their Atmospheric Releases

et al. 2021

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Disclosing the fate of lead (Pb) and cadmium (Cd) during the cement production process is the key to control their atmospheric emissions, which have not attracted much attention yet. In this study, three precalciner cement plants (CPs) using different raw materials in Guizhou Province in Southwest China were investigated. It showed that the concentrations of Pb and Cd in different raw materials and the associated total metal input of these materials were different among CPs; the behavior of Pb and Cd were almost the same during the clinker production process that there has been no accumulation of these two elements inside the system, and nearly all input of Pb and Cd were discharged by the clinker. Although the temperature of clinkerization was pretty high of 1450 °C, the atmospheric emission ratio of both metals was negligible (<0.006% for Pb and <0.002% for Cd of the total output, respectively); the main reason might be that the two elements were incorporated into the minerals of clinker, either as silicate or sulfate. The long-term environmental impacts of some high Pb-and Cd-laden clinkers and cement need to be monitored and evaluated.

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Section: Introductionsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Fate of Lead and Cadmium in Precalciner Cement Plants and Their Atmospheric Releases

et al. 2021

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“… , By comparison, PBM at urban sites worldwide showed relatively lower Δ 199 Hg and Δ 200 Hg values as compared to observations at Chinese rural sites, in marine air, and at a coastal site in the United States (Figure ). The isotopic composition in flue gases and other primary anthropogenic emissions shows slightly negative to near-zero values of Δ 199 Hg and Δ 200 Hg. − The lower values of PBM Δ 199 Hg and Δ 200 Hg at urban sites would therefore suggest relatively higher contributions from primary anthropogenic emissions (PBM emissions and adsorption of GOM emitted from anthropogenic sources) to PBM in the urban areas. , …”

Section: Resultsmentioning

confidence: 99%

Sources and Transformation Mechanisms of Atmospheric Particulate Bound Mercury Revealed by Mercury Stable Isotopes

Liu

Yue

et al. 2022

Environ. Sci. Technol.

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This study examined the isotopic composition of particulate bound mercury (PBM) in 10 Chinese megacities and explored the associated sources and transformation mechanisms. PBM in these cities was characterized by negative δ202Hg (mean: −2.00 to −0.78‰), slightly negative to highly positive Δ199Hg (mean: −0.04 to 0.47‰), and slightly positive Δ200Hg (mean: 0.02 to 0.06‰) values. The positive PBM Δ199Hg signatures were likely caused by physiochemical reactions in aerosols. The Δ199Hg/Δ201Hg ratio varied from 0.94 to 1.39 in the cities and increased with the increase in the corresponding mean Δ199HgPBM value. We speculate that, in addition to the photoreduction of oxidized Hg, other transformation mechanisms in aerosols (e.g., isotope exchange, complexation, and oxidation, which express nuclear volume effects) also shape the Δ199HgPBM signatures in the present study. These processes are likely enhanced in the presence of strong gas-particle partitioning of gaseous oxidized Hg (GOM) and elevated levels of redox active metals (e.g., Fe), halides, and elemental carbon. Based on Δ200HgPBM data presented in this and previous studies, we estimate that large proportions (∼47 ± 22%) of PBM were sourced from the oxidation of gaseous elemental Hg followed by the partitioning of GOM onto aerosols globally, indicating the transformation of Hg(0) to PBM as an important sink of atmospheric Hg(0).

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“…2). For example, cement production and industry boilers sector contributed most UP-PCBs emissions in Southwest China because of widespread distribution of cement plants in this area (Li et al, 2021;NBSC, 2020;Song et al, 2019). In addition, North China accounted for more than 33% of total iron and steel production in Chinese mainland (NBSC, 2020).…”

Section: National and Provincial Emissions From Various Sources In 2019mentioning

confidence: 99%

Temporal and spatial variations of atmospheric unintentional PCBs emissions in Chinese mainland from 1960 to 2019

Huang

Zhang

et al. 2022

Preprint

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Abstract. Polychlorinated biphenyls (PCBs) are a group of persistent organic pollutants (POPs) that have been proven to be harmful to ecosystem and human health. Detailed information about the spatiotemporally distribution of unintentionally produced PCBs (UP-PCBs) is crucial for understanding the environmental fate and associated health risks. However, researches estimating UP-PCBs emissions in China are limited. In this study, source-specific and year-varying emission factor (EF) dataset was used to develop emission inventory of 12 dioxin-like UP-PCBs congeners covering 66 sources in Chinese mainland with spatial resolution of province for 1960 to 2019 and 0.1°×0.1° for 2019. The results indicated that historical national UP-PCBs emission represented an increasing trend until around 1995, and then showed an overall decreasing trend from 1995 to 2019. Cement production was the largest UP-PCBs emission source in Chinese mainland. Geographically, East and North China contributed largest UP-PCBs emission across Chinese mainland. High emission densities were mainly happened in the densely populated and well-developed region such as Yangtze River Delta Urban Agglomeration and Pearl River Delta. Furthermore, highly positive correlations of emission densities with population and GDP densities were identified.

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Mercury isotope signatures of a pre-calciner cement plant in Southwest China

Cited by 17 publications

References 44 publications

Fate of Lead and Cadmium in Precalciner Cement Plants and Their Atmospheric Releases

Fate of Lead and Cadmium in Precalciner Cement Plants and Their Atmospheric Releases

Sources and Transformation Mechanisms of Atmospheric Particulate Bound Mercury Revealed by Mercury Stable Isotopes

Temporal and spatial variations of atmospheric unintentional PCBs emissions in Chinese mainland from 1960 to 2019

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