Micropore Structure and Fractal Characteristics of Clays Due to Freeze-Thaw and Compression Based on Mercury Intrusion Porosimetry

Wang, Shengfu; Liu, Liang; Ke-min, Xue; Zhang, Dongjie; Li, Mingdong; Li, Dongwei; Yuan, Chang

doi:10.3389/feart.2022.851673

Cited by 3 publications

(1 citation statement)

References 57 publications

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“…Evacuate it continuously for 48h at -80 ℃. PM-33-18 full-automatic mercury intrusion tester is used to conduct mercury intrusion test and analyze the pore characteristics of soil samples [29][30] .…”

Section: Experimental Methodsmentioning

confidence: 99%

Effects of Saline Soil Characteristics on Plant Growth Environment in Cultivated Depth of the Yellow River Delta

Qin

Liu

Luan

et al. 2022

Preprint

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This study combines the soil salinity determination, pH determination, ion content determination, particle size distribution (PSD), X-ray diffraction and Mercury intrusion Porosimetry (MIP) were used to quantitatively analyze the characteristics of saline-alkali soil within the cultivation depth of the Yellow River Delta, to explore the influence of the characteristics of saline-alkali soil in the coastal area on the plant growth environment. The results showed that the salinity content of surface saline-alkali soil in the Yellow River Delta was as high as 11.39 g/kg, which was 10 times higher than that of normal soil. The extremely high salinity affected plant growth through direct and indirect salinity damage. Soil pH, ion content, soil texture and mineral composition all affect plant growth. In the coastal saline-alkali soil of the Yellow River Delta, 98% of pores are inactive pores and capillary pores with a pore size of 0.1 to 10 and the pore distribution is regular. The study on the characteristics of saline-alkali soil in the Yellow River Delta can analyze the effects of saline-alkali soil on plant growth environment from physical, chemical and microscopic properties, and is of great significance to the treatment of saline-alkali soil in coastal areas.

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Section: Experimental Methodsmentioning

confidence: 99%

Effects of Saline Soil Characteristics on Plant Growth Environment in Cultivated Depth of the Yellow River Delta

Qin

Liu

Luan

et al. 2022

Preprint

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Microscopic Simulation of RE3+ Migration in Ion-Type Rare Earth Ores Based on Navier–Stokes Equation—Exchange Reaction—Ion Migration Coupling

Wang,

Wu,

Rao

et al. 2024

Metals

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In the in-situ leaching method of ionic rare earth, ion exchange reaction between rare earth ions and leaching agent ions is carried out, which allows the rare earth ions to be leached from the ore body as the leaching solution flows through the pores. This indicates that the leaching process of rare earth ions is closely related to the seepage field, ion exchange field, and ion migration process of the leaching solution. In this study, an ionic rare earth mine located in Longnan of Jiangxi Province was taken as the research object. By conducting nuclear magnetic resonance scanning on the ore samples of this mine and vectorizing the nuclear magnetic resonance images, a two-dimensional geometric model of pores was obtained. Then, COMSOL Multiphysics software was used to establish a coupled numerical model of seepage–exchange–migration of the ionic rare earth mine during the leaching process at the pore scale to study the seepage situation of leaching solution with different injection strengths and concentrations, as well as the exchange and migration process. The results show that increasing the concentration of magnesium ions can increase the difference of ion diffusion concentration, accelerate the forward exchange rate of ions, promote the forward exchange reaction, and improve the concentration gradient of rare earth ions in the leaching solution. The more significant the diffusion effect, the higher the ion migration rate, while at the same time inhibiting the reverse adsorption of rare earth ions, and accelerating the leaching efficiency of rare earth ions. In addition, increasing the strength of the injection solution allows rare earth ions to leach out of the ore body earlier, shortens the leaching cycle, and thus reduces the peak concentration of leached rare earth ions. By analyzing the effects of the strength of the injection solution and leaching concentration on ionic rare earth leaching, the influence of those two factors on engineering economy can be briefly evaluated, which can be provided as a reference for the optimization of ionic rare earth mining technology.

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A review of advancements in the theory and characterization of soil macropore structure

Cao,

Zhang,

Liu

et al. 2024

PeerJ

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Soil has an intricate pore structure, with the macropore structure serving as a pivotal component of gas exchange, liquid flow, and solute transport within the soil matrix. Scientifically understanding the macropore structure is important for the exploration of soil ecological functions. Drawing upon research literature from diverse nations, this study presents a comprehensive summary of past research findings, thoroughly examining the definition and taxonomy of soil macropores. Additionally, we delve into the factors that affect macropore structure, the effects of macropores on soil ecological functions, and the indicators that describe the nature of macropores. Furthermore, the principles, suitability conditions, benefits, and limitations of the widely utilized techniques for characterizing soil macropore structure were outlined, including staining observation, soil water retention curve, mercury intrusion porosimetry, gas adsorption, nuclear magnetic resonance, scanning electron microscopy, and computed tomography (CT). A comparative analysis was conducted to assist scholars in comprehending the theory of soil macropores, facilitating the selection of suitable macropore structure characterization techniques, and enabling the development of collaborative application modes among these techniques. Using the Web of Science core collection database, bibliometric software such as VOSviewer and CiteSpace were employed to explore the research hotspots and trends in CT, which is currently the most popular technique for characterizing soil macropore structure. This analysis offers insights into the future prospects of CT in the field of soil macropore structure characterization techniques. This article is of particular interest to readers engaged in the characterization of soil macropores.

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Micropore Structure and Fractal Characteristics of Clays Due to Freeze-Thaw and Compression Based on Mercury Intrusion Porosimetry

Cited by 3 publications

References 57 publications

Effects of Saline Soil Characteristics on Plant Growth Environment in Cultivated Depth of the Yellow River Delta

Effects of Saline Soil Characteristics on Plant Growth Environment in Cultivated Depth of the Yellow River Delta

Microscopic Simulation of RE3+ Migration in Ion-Type Rare Earth Ores Based on Navier–Stokes Equation—Exchange Reaction—Ion Migration Coupling

A review of advancements in the theory and characterization of soil macropore structure

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