A New Technique for Preparation of Two-Phase Foam Materials for Controlling Mine Dust and its Application

2011 ◽  
Vol 328-330 ◽  
pp. 372-375
Author(s):  
He Tang Wang ◽  
De Ming Wang ◽  
Wan Xing Ren
Keyword(s):  
Coal Mine ◽  
Experimental System ◽  
Dust Control ◽  
Working Environment ◽  
New Technique ◽  
Water Spray ◽  
Two Phase ◽  
Underground Coal Mine ◽  
Mine Dust ◽  
A New Technique

In order to overcvome the shortage of current dust control technology in coal mine, especially the traditional water spray method, a two-phase foam materials preparation experimental system was established based on the simulation of water and air conditions in underground coal mine. And a new technique which can prepare high-performance foam was proposed, and the main technical parameters and application conditions to implement foam dedusting were determined through plenty of experimental. Then, the new technique had been applied in two large underground coal mine. The results show that its dedusting efficiency to total dust and respirable dust reached 90.5% and 85.4% in the fully-mechanized excavated face, as 1.97 times and 1.88 times higher than water spray respectively. However, its water consumption is only as 10% to 20% as conventional water spray. It is proved that this new technique for preparation of foam can reduce mine dust concentration remarkably and improved the working environment obviously, and has a broad application prospect and promotion value to control dust in underground coal mines and other related industry.

scholarly journals Examination of a newly developed mobile dry scrubber (DS) for coal mine dust control applications

Transactions ◽  
2016 ◽  
Vol 340 (1) ◽  
pp. 38-47
Author(s):  
J. Organiscak ◽  
J. Noll ◽  
D. Yantek
Keyword(s):  
Coal Mine ◽  
Dust Control ◽  
Control Applications ◽  
Mine Dust

Grouting of bed separation spaces to control sliding of the high-located main key stratum during longwall mining

2020 ◽  
Vol 53 (4) ◽  
pp. 569-578
Author(s):  
Xiang-yu Wang ◽  
Wen-da Wu ◽  
Bo-wen Wu
Keyword(s):  
Coal Mine ◽  
Longwall Mining ◽  
Mine Safety ◽  
New Technique ◽  
High Water Content ◽  
Beam Model ◽  
Key Stratum ◽  
Geological Conditions ◽  
Bed Separation ◽  
A New Technique

The gob-side entry 150–180 m behind the 14201 working face at Majialiang coal mine is severely deformed. We developed a new technique to control the behaviour of the high-located main key stratum (HMKS) to improve mine safety. The failure type and breaking span of the HMKS were determined based on key stratum theory and the voussoir beam model. By monitoring the deformation of the entry and surface subsidence, we found that the main cause of the large deformation of the gob-side entry was sliding of the HMKS. A new technique is proposed to add grout between the separated beds during mining. Physical simulations indicated that this technique is efficient in controlling sliding of the HMKS and avoiding strong dynamic loading, with the peak abutment stress reduced by 59%. Grouting stations were set up at a spacing of 150 m behind the advancing work face based on the principles and key parameters of the technique and the geological conditions at Majialiang coal mine. Before the HMKS began to slide, we injected high-water content materials with a water to cement ratio of 1.5:1 into the bed separation space to prevent breaking of the key strata.

A New Imaging Logging Technology Based on Magnetoacoustic Tomography with Magnetic Induction

2012 ◽  
Vol 433-440 ◽  
pp. 63-67 ◽  
Author(s):  
Hui Xia ◽  
Guo Qiang Liu ◽  
Wen Jing He
Keyword(s):  
High Resolution ◽  
Magnetic Induction ◽  
Experimental System ◽  
New Technique ◽  
Acoustic Tomography ◽  
Practical Application ◽  
Measurement Result ◽  
A New Technique ◽  
Copper Coil

Imaging logging is a new technique which has been developing in recent years, its’ silo facilities could collect large information with high resolution, and the measurement result is usually presented in graphics after processed. This paper presents a new imaging logging technique based on magnetic-acoustic Tomography with Magnetic Induction(MAT-MI), introduces its’ logging principle, gives detailed experimental system, makes a simple copper coil experiment and verifies the feasibility of the technique. These studies will lay a foundation for practical application of new imaging logging technology.

A new technique for measuring water transport across the seawater eel intestine

1986 ◽  
Vol 122 (1) ◽  
pp. 257-268 ◽  
Author(s):  
M. Ando ◽  
H. Sasaki ◽  
K. C. Huang
Keyword(s):  
Water Flux ◽  
Experimental System ◽  
New Technique ◽  
Perfusion Method ◽  
Marker Substances ◽  
Perfusate Flow ◽  
The Difference ◽  
A New Technique ◽  
Net Water Flux

A new technique was developed for measuring net water flux across the eel intestine in vitro. The new perfusion method was suitable for long duration experiments because of continuous oxygen supply to both the external and the perfusion medium. Net water flux was calculated directly from the difference between the rates of effluent and perfusate flow without measuring the concentration of marker substances. The calculated value of net flux appears to be reliable because: its direction is always from mucosa to serosa in both everted and non-everted intestine; ouabain diminishes it to zero; it is identical with the standard water flux obtained under zero perfusion; and it is identical with the value obtained by means of [14C]PEG following the previous perfusion method. The net water fluxes obtained by the new method were steadier than those obtained with the previous complicated perfusion method. In this new experimental system, the net water flux and the transepithelial potential difference (PD) decreased gradually with time, and were not restored by application of adrenergic agonists or cortisol. These parameters were stimulated by 5 mmol l-1 L-alanine, but not by D-glucose, L-valine or L-glycine, indicating a specific action of L-alanine.

scholarly journals Characterization of Particle Size and Composition of Respirable Coal Mine Dust

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 276
Author(s):  
Lei Pan ◽  
Sean Golden ◽  
Shoeleh Assemi ◽  
Marc Freddy Sime ◽  
Xuming Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Chemical Composition ◽  
Size Distribution ◽  
Coal Mine ◽  
Dust Particles ◽  
Underground Coal Mine ◽  
Mine Dust ◽  
Rock Dust

Respirable coal mine dust (RCMD) particles, particularly the nano-sized fraction (<1 μm) of the RCMD if present, can cause severe lung diseases in coal miners. Characterization of both the particle size and chemical composition of such RCMD particles remains a work in progress, in particular, with respect to the nano-sized fraction of RCMD. In this work, various methods were surveyed and used to obtain both the size and chemical composition of RCMD particles, including scanning electron microscopy (SEM), scanning transmission electron microscopy (S-TEM), dynamic light scattering (DLS), and asymmetric flow field-flow fractionation (AsFIFFF). It was found that the micron-sized fraction (>1 μm) of RCMD particles collected at the miner location, from an underground coal mine, contained more coal particles, while those collected at the bolter location contained more rock dust particles. Two image processing procedures were developed to determine the size of individual RCMD particles. The particle size distribution (PSD) results showed that a significant amount (~80% by number) of nano-sized particles were present in the RCMD sample collected in an underground coal mine. The presence of nano-sized RCMD particles was confirmed by bulk sample analysis, using both DLS and AsFIFFF. The mode particle size at the peak frequency of the size distribution was found to be 300–400 nm, which was consistent with the result obtained from SEM analysis. The chemical composition data of the nano-sized RCMD showed that not only diesel particles, but also both coal and rock dust particles were present in the nano-sized fraction of the RCMD. The presence of the nano-sized fraction of RCMD particles may be site and location dependent, and a detailed analysis of the entire size range of RCMD particles in different underground coal mines is needed.

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