The methane desorption model of coal under the condition of desorption damage is constructed, and more than 30 groups of experiments are verified. 1. INTRODUCTION A significant outburst of coal and gas accidents will be accompanied by energy release, which produces strong power in the period of underground mining.1−3 …

During coal mining, the gas pressure experiences fluctuations due to the mining process. The pressure changes can cause gas adsorption or desorption in the coal, leading to shrinkage and swelling in the coal matrix. Therefore, gas adsorption or desorption damages the microcrystalline structure of coal (Pan et al. 2019).

Effect of filling materials on reconstructed soil phosphorus adsorption and desorption in mining area. Author links open overlay panel Kexin Jing a, Xiangyu Min a b c, Wen Song a b, Dongyun Xu a b, Xinju Li a b c. Show more. Add to Mendeley. ... Coal mining led to severe land subsidence, destruction of soil structure, and loss of soil …

In order to study the mechanism of methane desorption and desorption hysteresis, three sets of samples of long-flame coal, coking coal, and anthracite were collected, and experiments such as ...

Under the same conditions, the initial gas desorption rate of tectonic coal is faster and the gas diffusion ability is stronger, so that when the external conditions are suitable, especially under the influence of mining, the gas in tectonic coal is more likely to undergo desorption and diffusion behaviour, while the permeability of tectonic ...

The maximum experiment coal consumption is 1200 kg, the mining system is developed to conduct experiment for gas desorption under excavating disturbance, and the plane-charging cribriform ...

Herein, activated red mud particles are used as adsorbents for phosphorus adsorption. HCl solutions with different concentrations and deionized water are employed for desorption tests, and the desorption mechanism under the following optimal conditions is investigated: HCl concentration = 0.2 mol/L, desorbent dosage = 0.15 L/g, desorption …

The primary purpose of this paper is to research the law of gas seepage considering gas desorption in heterogeneous coal theoretically. A mechanical model on gas seepage considering gas desorption in heterogeneous coal is established, and the governing equation of gas seepage is discretized by the finite volume method with a new …

Since the region of the coal body in this study can be divided into 259 × 518 pixel points, while the infrared temperature measurement region of the coal body is only 259 × 462 pixels, the total gas desorption over the IRT measurement area of the coal body can be calculated by Formulae (3). (3) Q P i = 462 Q a l l 1036 = 0.446 Q a l l where:

Coal body desorption characteristics are one of the key factors that influence the development of coalbed methane (CBM). In this study, 91 coal core samples from 11 CBM wells in the Fukang mining area were collected from Xinjiang, China, and the coal quality, high-pressure mercury compression, gas content, and natural desorption …

To investigate the influence of hydraulic permeability enhancement on the gas desorption and accumulation characteristics of water-bearing coal bodies and deeply implement hydraulic fracturing measures to prevent and control gas disasters in coal seams, isothermal adsorption/desorption tests, low-pressure CO2 adsorption tests, and …

Coal is a significant energy source worldwide, but coal mining presents considerable safety and environmental hazards, including coal and gas outbursts that pose a significant risk of fatality and property damage [1,2].An instantaneous coal outburst is an abrupt and violent ejection of coal and gas during underground mining [3,4], …

Many scholars have found that outburst, coal pulverization and gas desorption promote each other (Fig. 1), and the rapid gas desorption from pulverized coal is a necessary condition for the development of outburst (Tu et al., 2022).Zhao et al. (2016) focused on energy balance and pneumatic conveying and concluded that it is necessary …

Moreover, the presence of As in the agricultural soils (SG and SE) produced a slight desorption of P (negative values for P adsorbed concentrations in Fig. 3), while this effect was not observed in the mineral mining soils. This indicates that competition may occur both ways, especially in soils with low adsorption capacity.

Article 14 June 2022. Engineered mineralogical interfaces as radionuclide repositories. Article Open access 06 February 2023. Introduction. Regolith-hosted ion-adsorption …

First, combining the diffusivity of coal of different particle sizes and the distribution function of broken coal, we present a gas desorption model for fragmented …

An in-depth understanding of gas diffusion characteristics in coal is of great value to coalbed methane (CBM) production planning and coal mine safety management. However, the mechanism and model of gas diffusion is still unclear, and some methods for determining diffusion coefficients are not accurate enough. Accordingly, a free gas …

MRM and SOTS models described Li sorption/desorption kinetic well by considering the reversible and irreversible reactions in alkaline soils. ... and ceramics industries is prompting the exploitation and mining of Li. The demand for Li-ion batteries is projected to be more than two million tons by 2030 (Kaunda, 2020). Moreover, the …

The desorption velocity decreases gradually. After 2200 min, the quantity of gas adsorbed reaches a stable value of 1.0 m3, and the desorption velocity tends to zero. (2) Under mining conditions, the coal sample undergoes unloading and collapse, and the coal sample perme- ability increases significantly.

Coal-gas outburst is a violent phenomenon of energy release and strong dynamics is generated in underground coal mining.Coal-gas outbursts are accompanied by strong coal pulverization, and the gas desorbed by pulverized coal will in turn promote the development and spread of outbursts. Quantitative study on the role desorption gas …

To conduct systematic research on desorption hysteresis, comprehensive experiments are going to be carried out, and future research should consider these factors as well as the disturbance of the drilling and mining. 7. Conclusions. The desorption hysteresis is a common phenomenon that affects the transfer of methane between matrix …

A unique indirect gravimetric apparatus was used to measure the gas adsorption and desorption isotherms of coal of different particle sizes ranging from around 150 urn to 16 mm. Langmuir model was ...

The results showed that (i) the phosphorus adsorption capacity of all RMS samples was lower than that of the normal cultivated soil (NCS), the YSR was lower than …

High desorption rate. Under the condition of high temperature and high pressure, the desorption rate of gold-loaded carbon is greatly increased, up to 98%, and the desorption time is shortened by ten times. 2. Save energy and reduce cost. Compared with the heating and atmospheric pressure process, the whole desorption process is …

The numerical results indicate that the desorption and Klinkenberg effects and mechanical process effect make a significant contribution to gas flow in the coal seam. Without considering the desorption and Klinkenberg effects and the coupling action of mechanical process, the gas pressure in the coal seam would be underestimated.",

1. Introduction. A significant outburst of coal and gas accidents will be accompanied by energy release, which produces strong power in the period of underground mining. 1−3 Gas outburst produces a large amount of pulverized coal, and the desorption gas of pulverized coal will further facilitate the outburst. 4−6 Therefore, gas significantly …

The mining-induced stress causes unstabilized failure of the coal seam and desorption of adsorbed gas occurs instantaneously. When deep coal seams are mined with high intensity, the desorption rate of gas increases and the diffusion characteristics become more complex. ... The desorption curves of the same coal samples had similar ...

In addition, in the process of mining, gas desorption will take place in the gas migration propelled by the pressure difference in coal, and the resulting desorption damage could change the parameters, such as gas desorption amount. However, this factor is hardly considered in the current research on gas migration. Therefore, the study ...