wave technology for coal crushing

The Applied Research of Loose Blasting Technique in ...

Support crushing accidents occur frequently in coal mines, which have a serious impact on their safety production. Usually people adopt the loose blasting technology for processing the pressing frame accidents, that is, using the detonative action generated by explosives to cause the rock mass particles vibration which would spread in the form of stress wave to crush the …

New Trends in Coal Preparation Technologies and …

2008-2-15 · Fuzzy Control of the Wave Pattern of Pulsation in Air-Pulsated Jig Separation of Fine Particles in Dense Medium Cyclone: the Effect of the Medium Yield Stress Fine and Ultrafine Coal Particles in Float/Sink Separations Development of an Airflow Sorter for Coal Cleaning D.W. Horsfall, S. Btaszczynski, and W.Z. DrogoA (South Africa/Poland) 143 JM.

Investigation of the Energy Evolution of Tectonic Coal ...

It is of great significance to ascertain the mechanical characteristics and deformation laws of tectonic coal that is under complex stress conditions for safe production, but the targeted research in this area is still insufficient at present. This paper performed triaxial tests under cyclic multi-level loading at different rates by using an MTS-815 Rock Mechanics Testing System.

Mine Mechanization and Technology Development

Technology developments, transfer of technologies and commercialization of the developed products for the benefit of mining industry and society. Our Accomplishments Application of numerical modelling for simulating the caving behaviour of the overlying rock beds, predicting the caving span, convergence, closure abutment stress and estimation ...

Gas Jet Coal-Breaking Behavior: An Elliptical Crushing ...

2021-7-26 · Research Article Gas Jet Coal-Breaking Behavior: An Elliptical Crushing Theoretical Model Gongda Wang,1,2 Yuanyuan Wang,1,2 Xin Yang,1,2 and Xin Song1,2 1School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China 2State Key Laboratory of the Ministry of Education of China for High-Efficiency Mining and …

Experimental Investigation on the Mechanism of Coal and ...

2021-8-5 · The fragmentation of coal produces abundant coal gases and is presumed to be the defining characteristic of coal and gas outbursts. Knowing the mechanism of these catastrophic hazards is one of the most important breakthroughs in mining geology. In the outburst process, coal spallation represents a unique failure type and typically leaves behind a spallation area …

Jefferies Coal Crusher | Crusher Mills, Cone Crusher, Jaw ...

Latest merger wave different from ''80s – Baltimore Sun … best time to buy is when people are selling," said Frank Baxter, head of Jefferies … Derailed train buries Ellicott City …

A new shock-wave test apparatus for liquid CO2 blasting ...

2020-10-13 · A new shock-wave test apparatus for liquid CO2 blasting and measurement analysis . Abstract . Liquid CO 2 blasting of coal or rock body technology is widely used for improving permeability, pressure

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The PulseWave NRD technology was able to show mercury reductions of 60-80% in coal that had already been processed through a conventional coal preparation plant, and further was found to reduce the inherent moisture content of Illinois coals by 60% to greater than 80% with an effective separation technology, with a concomitant ~10% increase in ...

Structured Innovation of High-Performance Wave Energy ...

2018-1-25 · @article{osti_1418966, title = {Structured Innovation of High-Performance Wave Energy Converter Technology: Preprint}, author = {Weber, Jochem W. and Laird, Daniel}, abstractNote = {Wave energy converter (WEC) technology development has not yet delivered the desired commercial maturity nor, and more importantly, the techno-economic performance.

A new shock-wave test apparatus for liquid CO2 blasting ...

2020-10-13 · A new shock-wave test apparatus for liquid CO2 blasting and measurement analysis ... blasting of coal or rock body technology is widely used for improving permeability, pressure relief, cutting ... high danger, and massive coal body crushing. Moreover, CO. 2. produces an inert gas envi-ronment that inhibits coal combustion. This method

Home | pulsewavesciences

Home | pulsewavesciences

International Journal of Coal Science & Technology …

International Journal of Coal Science & Technology,,,,,,PubMed,

Crushing Technology for Reducing Emissions in Cement …

2021-12-24 · The application of continuous and semi-continuous mining technology can be relieved, and significant energy-saving effects and economic benefits can be achieved. Therefore, some crushing methods must be provided for the emission reduction of mines; common crushing methods include mixed crushing and pre-screening crushing.

Structured Innovation of High-Performance Wave Energy ...

2018-1-25 · These wave energy converter technology specifications will be made available to industry for further, ... (REEs) from coal and coal byproducts. The target performance was to produce a mixed REE product with content of at least two percent by weight on a dry mass basis in a cost-effective and environmentally benign manner.

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2021-9-30 · YU Zhengxing,JIANG Fuxing,LI Feng,et al itiative prevention and control technology of mine pressure bump under complicated condition of deep mine [J] al Science and Technology,2015,43(3):26-29,35.

Research on Energy Dissipation Laws of Coal Crushing …

2021-6-21 · Dynamic crushing characteristics of coals are closely related with energy absorption and release of coals under certain strain rate. Hence, it is necessary to investigate energy dissipation laws of coal crushing under the impact loads with different strain rates. Based on the dynamic and static mechanical tests, crushing energy, total absorption energy, total releasable …

Coal breakage features and fragment size distribution in ...

2021-4-20 · 1 INTRODUCTION. High-pressure water jets have been widely used for rock and coal fragmentation in the field applications of oil and gas exploration and development [1-3].Due to the unique advantages, such as high efficiency, dust-free, heat-low and vibration-low performance, the applications of water jets have become increasingly prominent in improving …

Look-Ahead Radar and Horizon Sensing for Coal Cutting …

HS technology equipped with pick force vector sensing can allow optimization of the cutting pick lacing pattern for minimum coal and rock crushing, thereby reducing float dust.

Propagation characteristics of pulverized coal and gas two ...

2017-7-20 · Coal and gas outbursts are dynamic failures that can involve the ejection of thousands tons of pulverized coal, as well as considerable volumes of gas, into a limited working space within a short period. The two-phase flow of gas and pulverized coal that occurs during an outburst can lead to fatalities and destroy underground equipment. This article examines the …

Effects of different conductive ions on pore-structure ...

Electric pulse fracturing technology is a new type of coal seam fracturing and permeability increasing technology based on high-pressure shock wave technology. ...

Coal Engineering

2021-12-20 · Combined with big data analysis, a coal enterprise quota preparation method suitable for smart mining background is proposed, and it strives to systematize and intelligence the quota preparation of smart mining enterprises. The Impact of Behavioral Integrity on Trust in Leader in Coal Mines. 2021, 53 (10): 0-0.

Crack Propagation Characteristics of Coal Samples ...

2021-12-7 · Gas drainage is the primary measure to control gas disasters in coal mines. However, more than 70% of the coal seams have low permeability, with a permeability coefficient of (0.001–0.1) × 10 –3 mD in China, which greatl Since then, the HVEP technology has witnessed a rapid development, and the technology has been widely used in many fields owing to its …

Experimental and numerical investigation on dynamic ...

(2) Shock waves, elastic deformation of medium particle. (3) Gas product in medium broken to release into the air from air shock wave in the blasting process. (4) Crushing and throwing flying of the medium. The above four aspects, the …

PATTERN RECOGNITION OF MINE MICROSEISMIC AND …

2018-5-11 · A microseismic (MS) monitoring system in a mine can monitor the MS signals generated by coal rock rupture and blasting waves and can distinguish the two types of waves more clearly to monitor and analyze the rupture and evolution process of coal rock.

Research progress on permeability improvement …

2020-4-23 · Coal is the major source of energy in China, accounting for over half of primary energy production and consumption. The current energy structure and economic development stage of China suggest that coal will be the major energy source for at least the next decade (National Energy Administration 2016).As the depth of coal mining increases, the permeability …

Study on the technology of enhancing permeability by …

2021-10-13 · Coal seam gas predrainage technology is considered to be one of the most effective measures to prevent coal mine gas disasters 1,2,3,4,5,6.However, with increasing mining depth, the gas pressure ...

Study on the propagation mechanism of stress wave in ...

For the influence of the propagation law of stress wave at the coal-rock interface during the pre-blasting of the top coal in top coal mining, the ANSYS-LS/DYNA fluid-solid coupling algorithm was used to numerical calculation and the lifedeath element method was used to simulate the propagation of explosion cracks. The equation of the crushing zone and the fracturing zone …

Rock-breaking mechanism and experimental analysis of ...

2017-9-1 · When the shock wave in the confined medium with the vicinity of the explosive first impacts on the wall surface of the borehole, the strength of the induced rock shock wave far exceeds the dynamic compressive strength of rock and the borehole surrounding rock is subjected to intensive compressive damage .Hard rock is subjected to crushing damage under …

A new shock-wave test apparatus for liquid CO2 blasting ...

2019-4-12 · The shock-wave pressure decays non-linearly with distance from the gas outlet. The fractured radius of the coal or rock in liquid CO 2 blasting is controlled by shock-wave pressure that is also related to the volume and pressure of CO 2 filled into the fracturing tube, which is a further research topic of this work.