Determination of quartz content for Indian coals using an FTIR technique

Bandopadhyay, Anup Kumar

doi:10.1016/j.coal.2009.10.018

Cited by 40 publications

(9 citation statements)

References 44 publications

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“…Its main ingredient is surfactant, some chemical additives and inorganic salt which can help to develop some new features, so that the wetting agent's effect can be optimized [20,21]. To determine the optimal mixture proportions having the best wetting effect and cost performance, the character and mixture principles of surfactant and inorganic salts were researched and five kinds of wetting agents were made.…”

Section: Complex Wetting Agent and Effects Analysismentioning

confidence: 99%

Application study on complex wetting agent for dust-proof after gas drainage by outburst seams in coal mines

Wang

et al. 2016

International Journal of Mining Science and Technology

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Section: Complex Wetting Agent and Effects Analysismentioning

confidence: 99%

Application study on complex wetting agent for dust-proof after gas drainage by outburst seams in coal mines

Wang

et al. 2016

International Journal of Mining Science and Technology

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“…The least squares curve-fitting method by Painter et al [289] shows comparable mineralogical compositions (e.g., kaolinite, quartz, calcite, pyrite, and illite) in coal dust. The FTIR method has also been used to measure the quartz content in coal ashes [290].…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Review of Respirable Coal Mine Dust Characterization for Mass Concentration, Size Distribution and Chemical Composition

et al. 2021

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Respirable coal mine dust (RCMD) exposure is associated with black lung and silicosis diseases in underground miners. Although only RCMD mass and silica concentrations are regulated, it is possible that particle size, surface area, and other chemical constituents also contribute to its adverse health effects. This review summarizes measurement technologies for RCMD mass concentrations, morphology, size distributions, and chemical compositions, with examples from published efforts where these methods have been applied. Some state-of-the-art technologies presented in this paper have not been certified as intrinsically safe, and caution should be exerted for their use in explosive environments. RCMD mass concentrations are most often obtained by filter sampling followed by gravimetric analysis, but recent requirements for real-time monitoring by continuous personal dust monitors (CPDM) enable quicker exposure risk assessments. Emerging low-cost photometers provide an opportunity for a wider deployment of real-time exposure assessment. Particle size distributions can be determined by microscopy, cascade impactors, aerodynamic spectrometers, optical particle counters, and electrical mobility analyzers, each with unique advantages and limitations. Different filter media are required to collect integrated samples over working shifts for comprehensive chemical analysis. Teflon membrane filters are used for mass by gravimetry, elements by energy dispersive X-ray, rare-earth elements by inductively coupled plasma-mass spectrometry and mineralogy by X-ray diffraction. Quartz fiber filters are analyzed for organic, elemental, and brown carbon by thermal/optical methods and non-polar organics by thermal desorption-gas chromatography-mass spectrometry. Polycarbonate-membrane filters are analyzed for morphology and elements by scanning electron microscopy (SEM) with energy dispersive X-ray, and quartz content by Fourier-transform infrared spectroscopy and Raman spectroscopy.

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“…Since the IR spectrum of kaolinite has an absorption band at 790 cm −1 that interferes with the determination of quartz involving the 800-cm −1 doublet, (12,30) a kaolinite correction scheme was developed that entails measuring the area of the kaolinite band at 915 cm −1 for a standard kaolinite material and using a calibration factor to estimate the area of the masked kaolinite band at 790 cm −1 . (13,25) …”

Section: Resultsmentioning

confidence: 99%

Evaluation of Diffuse Reflection Infrared Spectrometry for End-of-Shift Measurement of α-quartz in Coal Dust Samples

Miller

Murphy

Bayman

et al. 2015

Journal of Occupational and Environmental Hygiene

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The inhalation of toxic substances is a major threat to the health of miners, and dust containing respirable crystalline silica (α-quartz) is of particular concern, due to the recent rise in cases of coal workers’ pneumoconiosis and silicosis in some U.S. mining regions. Currently, there is no field-portable instrument that can measure airborne α-quartz and give miners timely feedback on their exposure. The U.S. National Institute for Occupational Safety and Health (NIOSH) is therefore conducting studies to investigate technologies capable of end-of-shift or real-time measurement of airborne quartz. The present study focuses on the potential application of Fourier transform infrared (FT-IR) spectrometry conducted in the diffuse reflection (DR) mode as a technique for measuring α-quartz in respirable mine dust. A DR accessory was used to analyze lab-generated respirable samples of Min-U-Sil 5 (which contains more than 90% α-quartz) and coal dust, at mass loadings in the ranges of 100–600 μg and 600–5300 μg, respectively. The dust samples were deposited onto three different types of filters, borosilicate fiberglass, nylon, and polyvinyl chloride (PVC). The reflectance, R, was calculated by the ratio of a blank filter and a filter with deposited mine dust. Results suggest that for coal and pure quartz dusts deposited on 37 mm PVC filters, measurements of −log R correlate linearly with known amounts of quartz on filters, with R2 values of approximately 0.99 and 0.94, respectively, for samples loaded up to ~4000 μg. Additional tests were conducted to measure quartz in coal dusts deposited onto the borosilicate fiberglass and nylon filter media used in the NIOSH-developed Personal Dust Monitor (PDM). The nylon filter was shown to be amenable to DR analysis, but quantification of quartz is more accurate when the filter is “free,” as opposed to being mounted in the PDM filter holder. The borosilicate fiberglass filters were shown to produce excessive interference, making quartz quantification impossible. It was concluded that, while the DR/FT-IR method is potentially useful for on-filter measurement of quartz in dust samples, the use of PVC filters produced the most accurate results.

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Determination of quartz content for Indian coals using an FTIR technique

Cited by 40 publications

References 44 publications

Application study on complex wetting agent for dust-proof after gas drainage by outburst seams in coal mines

Application study on complex wetting agent for dust-proof after gas drainage by outburst seams in coal mines

Review of Respirable Coal Mine Dust Characterization for Mass Concentration, Size Distribution and Chemical Composition

Evaluation of Diffuse Reflection Infrared Spectrometry for End-of-Shift Measurement of α-quartz in Coal Dust Samples

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