Treatment with calcite was more effective in decreasing desorption kinetics of Cd in the mine soil in the initial time period (30 min), while the same was observed in the forest soil only after ...

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 mining can pose safety risks as mining stress and adsorption-desorption damage the coal in front of the working face. To address this, a damage …

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 ...

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 …

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 ...

@article{Wu2023ReviewOR, title={Review of rare earth element (REE) adsorption on and desorption from clay minerals: Application to formation and mining of ion-adsorption REE deposits}, author={Zhenxiao Wu and Yu Chen and Yang Wang and Yuan Xu and Zhuoling Lin and Xiaoliang Liang and Hong-bin Cheng}, journal={Ore …

Outburst energy is a major factor influencing coal and gas outbursts, albeit its estimation is difficult owing to the lack of amenable means for quantification of gas desorption. In the past decades, determining the mechanism of outbursts is one of the most challenging issues in rock mechanics. In this study, a triaxial coal and gas outburst …

The desorption experiment showed that 98.7% of the adsorbed substances can be removed within 1 h and 97% of the capacity can be retained after fifty cycles of adsorption/desorption. Due to the high electro-adsorption efficiency and low energy consumption, this technology has the potential for practical application with renewable …

To investigate the CH 4 desorption characteristics in gas recovery during dewatering in CBM development, from the perspective of comparison between deep and shallow coal, the NMR method was used to investigate the CH 4 desorption characteristic during dewatering in coal samples collected from coal seam no. 15 in Qinshui coalfield. …

The main goals of this study were to evaluate the competitive sorption and desorption of Cd, Cr, Cu, Ni, Pb, and Zn, in mine soils from two mines in the province of A Coruña (Galicia, northwest Spain), to establish the selectivity sequences of sorption and desorption of these metals in the soils by means of distribution coefficients and to ...

The direct method test was developed for general mine safety applications by the U.S. Bureau of Mines in the early 1970's to measure the gas content of coal samples obtained from the relatively shallow depths of eastern U.S. coal mines. Over time, applications for gas content data evolved which required increasingly accurate desorption values.

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.

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 …

In addition, during the mining process, gas desorption and adsorption will inevitably occur during gas transport, driven by the pressure gradient in the coal body. As a result, …

2.1 Development of experimental device. As shown in Fig. 1, the experimental system for gas adsorption and desorption simulations in large-scale coal samples has been developed independently by China University of Mining and Technology (Beijing).The experimental system consists of four parts, which includes an experimental …

The haulage roadway of the F15-22080 working face, No.8 mine is situated within a special non-uniform stress zone. In this area, the extraction-boreholes drilling process frequently triggers coal and gas outburst. Against this background, this study systematically conducted high-pressure gas adsorption experiments and high-pressure …

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

Thus, determining the optimal range of stirring intensity to enhance conditioning performance is necessary. The influence of stirring speed on the adsorption …

Desorption damage significantly impacts coal desorption process dynamics, with methane desorption amount and velocity increasing with desorption …

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 …

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 …

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).

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 …

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 …

Coal and gas outbursts have occurred in the Zhaozhuang coal mine (a high gas coal mine) since its construction, and these outbursts pose a great threat to lives and property. Therefore, the combination of methane desorption experiments and molecular simulations was adopted to investigate the effects of moisture on the methane …

Ting Ren, Qingyi Tu, Longyong Shu & Yixuan Li. 1011 Accesses. 33 Citations. Explore all metrics. Abstract. Outburst energy is a major factor influencing coal …

1.. IntroductionCoupled gas flow and solid deformation in porous media has received considerable attention because of its importance in areas such as pneumatic test analysis, contaminant transport, and gas outbursts during coal mining [1], [2], [3].One major area of application concerning the coupled gas flow and solid deformation has been …

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 …

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 …