Thermogravimetric analysis of respirable coal mine dust for simple source apportionment

Jaramillo, Lizeth; Agioutanti, Eleftheria; Afrouz, Setareh Ghaychi; Keleş, Çiğdem; Sarver, Emily

doi:10.1080/15459624.2022.2100409

Journal of Occupational and Environmental Hygiene

2022

DOI: 10.1080/15459624.2022.2100409

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Thermogravimetric analysis of respirable coal mine dust for simple source apportionment

Lizeth Jaramillo

Eleftheria Agioutanti

Setareh Ghaychi Afrouz

et al.

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2024

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Cited by 8 publications

References 22 publications

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Advancing respirable coal mine dust source apportionment: a preliminary laboratory exploration of optical microscopy as a novel monitoring tool

Santa,

Sarver

2024

Int J Coal Sci Technol

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Exposure to respirable coal mine dust (RCMD) can cause chronic and debilitating lung diseases. Real-time monitoring capabilities are sought which can enable a better understanding of dust components and sources. In many underground mines, RCMD includes three primary components which can be loosely associated with three major dust sources: coal dust from the coal seam itself, silicates from the surrounding rock strata, and carbonates from the inert ‘rock dust’ products that are applied to mitigate explosion hazards. A monitor which can reliably partition RCMD between these three components could thus allow source apportionment. And tracking silicates, specifically, could be valuable since the most serious health risks are typically associated with this component-particularly if abundant in crystalline silica. Envisioning a monitoring concept based on field microscopy, and following up on prior research using polarized light, the aim of the current study was to build and test a model to classify respirable-sized particles as either coal, silicates, or carbonates. For model development, composite dust samples were generated in the laboratory by successively depositing dust from high-purity materials onto a sticky transparent substrate, and imaging after each deposition event such that the identity of each particle was known a priori. Model testing followed a similar approach, except that real geologic materials were used as the source for each dust component. Results showed that the model had an overall accuracy of $$86.5\%$$ 86.5 % , indicating that a field-microscopy based monitor could support RCMD source apportionment and silicates tracking in some coal mines.

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Advancing respirable coal mine dust source apportionment: a preliminary laboratory exploration of optical microscopy as a novel monitoring tool

Santa,

Sarver

2024

Int J Coal Sci Technol

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Effects of dust controls on respirable coal mine dust composition and particle sizes: case studies on auxiliary scrubbers and canopy air curtain

Animah,

Keles,

Reed

et al. 2024

Int J Coal Sci Technol

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Control of dust in underground coal mines is critical for mitigating both safety and health hazards. For decades, the National Institute of Occupational Safety and Health (NIOSH) has led research to evaluate the effectiveness of various dust control technologies in coal mines. Recent studies have included the evaluation of auxiliary scrubbers to reduce respirable dust downstream of active mining and the use of canopy air curtains (CACs) to reduce respirable dust in key operator positions. While detailed dust characterization was not a focus of such studies, this is a growing area of interest. Using preserved filter samples from three previous NIOSH studies, the current work aims to explore the effect of two different scrubbers (one wet and one dry) and a roof bolter CAC on respirable dust composition and particle size distribution. For this, the preserved filter samples were analyzed by thermogravimetric analysis and/or scanning electron microscopy with energy dispersive X-ray. Results indicate that dust composition was not appreciably affected by either scrubber or the CAC. However, the wet scrubber and CAC appeared to decrease the overall particle size distribution. Such an effect of the dry scrubber was not consistently observed, but this is probably related to the particular sampling location downstream of the scrubber which allowed for significant mixing of the scrubber exhaust and other return air. Aside from the insights gained with respect to the three specific dust control case studies revisited here, this work demonstrates the value of preserved dust samples for follow-up investigation more broadly.

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Respirable Coal Mine Dust in the Vicinity of a Roof Bolter: an Inter-laboratory Study to Compare Wet Versus Dry Dust Collection Systems

Animah,

Greth,

Afrouz

et al. 2024

Mining, Metallurgy & Exploration

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Thermogravimetric analysis of respirable coal mine dust for simple source apportionment

Cited by 8 publications

References 22 publications

Advancing respirable coal mine dust source apportionment: a preliminary laboratory exploration of optical microscopy as a novel monitoring tool

Advancing respirable coal mine dust source apportionment: a preliminary laboratory exploration of optical microscopy as a novel monitoring tool

Effects of dust controls on respirable coal mine dust composition and particle sizes: case studies on auxiliary scrubbers and canopy air curtain

Respirable Coal Mine Dust in the Vicinity of a Roof Bolter: an Inter-laboratory Study to Compare Wet Versus Dry Dust Collection Systems

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