Micromorphology and physicochemical properties of hydrophobic blasting dust in iron mines

Liu, Jianguo; Jin, Longzhe; Wang, Jiaying; Ou, Shengnan; Ghio, Jing-zhong; Wang, Tian-yang

doi:10.1007/s12613-019-1793-x

Cited by 11 publications

(9 citation statements)

References 32 publications

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“…The scanning electron microscope was used to detect and analyze the morphology, microstructure, and occurrence state of dust particles [31][32][33]39].…”

Section: Measurement Of Particle Shape and Surface Topographymentioning

confidence: 99%

Study on Factors Affecting Wettability of Blasting Dust in Dexing Copper Mine

et al. 2023

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The working face blasting dust of Dexing Copper Mine was taken as the research object, and hydrophilic dust (HD, sinking quickly to the bottom) and hydrophobic dust (HCD, floating on the surface for a long time) were separated. The wettability was quantitatively characterized by measuring the wetting contact angle of the two, and the physicochemical properties of the dust particles were comprehensively characterized by measuring the particle size distribution, surface properties, elemental composition, and phase composition of the dust particles. Finally, by comparing the differences in physicochemical properties between HCD and HD, the key factors affecting the wettability of dust were investigated. The results indicate that the wetting angle of HCD is much smaller than that of HD at any given time. When the wetting contact angle of HCD reaches 20° and is in a relative equilibrium state, HD tends to 0°. In terms of wetting properties, the average particle size of HCD is 21.97% smaller compared with HD, which makes HCD have a larger mass-specific surface area, surface energy, and surface activity. Additionally, the true density of HCD is 4.54% lower than that of HD. HCD is less affected by gravity and has a more complex surface pore structure, resulting in a more pronounced air film effect on the surface of dust particles. The formation of an air film greatly weakens the dust’s wettability. Therefore, particle size and surface structure are the main factors affecting the dust’s wettability. Organic substances cannot be detected in the HCD and HD spectra, indicating that both HCD and HD are hydrophilic phases, which determines the overall wettability of blasting dust. The phase composition of HCD and HD is similar, and the difference in the content of hydrophobic groups (C-C, C-H) between them is less than 3%, so the surface groups are not the main factors affecting the wettability of dust.

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“…The scanning electron microscope was used to detect and analyze the morphology, microstructure, and occurrence state of dust particles [31][32][33]39].…”

Section: Measurement Of Particle Shape and Surface Topographymentioning

confidence: 99%

Study on Factors Affecting Wettability of Blasting Dust in Dexing Copper Mine

et al. 2023

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“…The particles floated on the surface of deionized water were unwetted dust, called hydrophobic blasting dust (HBBD); in contrast, the particles deposited at the bottom of deionized water were wetted dust, called hydrophilic blasting dust (HLBD). Finally, HBBD and HLBD were extracted with a slide glass and dried at 100°C for 2 h. The same experimental method was carried out in our previous study (Liu et al 2019b).…”

Section: Materials and Experiments 21 Collection And Pretreatment Ofmentioning

confidence: 99%

“…This phenomenon is caused mostly by the difference in production mechanisms between the blasting dust and coal dust. Coal dust is caused by friction between a cutting machine and the coal body, whereas the blasting dust is produced from rock under strong explosive wave action (Liu et al 2019b). Furthermore, hardness of rock from that of coal may also contribute to distinct dust micromorphology.…”

Section: Particle Size Distribution (Psd) Analysismentioning

confidence: 99%

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Physicochemical factors affecting the wettability of copper mine blasting dust

Jin

Liu

Guo

et al. 2021

Int J Coal Sci Technol

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To investigate the factors affecting the wettability of copper mine blasting dust, the primary blasting dust was collected from an open-pit copper mine and separated into hydrophilic blasting dust (HLBD) and hydrophobic blasting dust (HBBD) using water flotation method. The physicochemical properties of HLBD and HBBD were measured and compared with each other. The properties included particle size distributions (PSDs), micromorphologies, pore structures, mineral components and surface organic carbon functional groups. The results show that particle size and pore structure of the blasting dust are the main factors affecting its wettability. Specifically, particle size of HBBD is smaller than that of HLBD, and their respiratory dust (less than 10 µm) accounts for 61.74 vol% and 53.00 vol%, respectively. The pore structure of HBBD is more developed, and the total pore volume of HBBD is 1.66 times larger than that of HLBD. The identical mineral compositions were detected in HLBD and HBBD by X-rays diffraction (XRD); however, the surface organic hydrophobic component of HBBD is slightly larger than that of HLBD, this may be the reason for the poor wettability of HBBD. This study is significant to understand the effects of physicochemical properties of copper mine blasting dust on its wettability.

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“…It is widely accepted that studying the influence of the physicochemical properties of dust on its wettability is important (Xu et al 2017;Wang et al 2017Wang et al , 2019Liu et al 2019b). In addition, decreasing the surface tension of wetting fluids is another effective approach to improve the wettability of coal dust (Xu et al 2018;Shi et al 2019;Meng et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Water-retaining properties of NCZ composite dust suppressant and its wetting ability to hydrophobic coal dust

Liu

Wang

Jin

et al. 2021

Int J Coal Sci Technol

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Coal dust is a primary threat to underground coal miners. The most common approach to control coal dust is hydraulic methods, such as water spray and coal seam water injection. To improve the dust suppressant efficiency of hydraulic methods, a novel chemical composite dust suppressant, called NCZ, was prepared in this study using calcium chloride (CaCl2), magnesium chloride (MgCl2), and nonionic surfactants using a thermal synthesis method. The water-retaining properties of NCZ powder and its solutions were characterized using the water absorption rate (WAR) and evaporation rate (ER), respectively, and the wetting abilities of the NCZ solutions on coal dust were tested using the initial contact angle (ICA) and sink rate (SR). The results indicate that the NCZ solutions have anti-evaporation effects, and the ER of the solution with a 20.0 wt% NCZ is reduced by 11.7% compared with that of clean water. Furthermore, NCZ solutions have remarkable enhancement effects on the wettability of coal dust. The ICA and SR of clean water and the NCZ solution at 20.0 wt% are 141.9° and 0 mg/s, and 29.3° and 1.46 mg/s, respectively. Finally, quantitative relationships between the solution surface tension and the ICA and IR were established using the least squares method. This study provides a new product for dust suppression in underground mines, which is significant for the optimum applied concentration of dust suppressant in mining operations.

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Micromorphology and physicochemical properties of hydrophobic blasting dust in iron mines

Cited by 11 publications

References 32 publications

Study on Factors Affecting Wettability of Blasting Dust in Dexing Copper Mine

Study on Factors Affecting Wettability of Blasting Dust in Dexing Copper Mine

Physicochemical factors affecting the wettability of copper mine blasting dust

Water-retaining properties of NCZ composite dust suppressant and its wetting ability to hydrophobic coal dust

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