Underground pneumatic separation of coal and gangue with large size (≥50mm) in green mining based on the machine vision system

Kehong, Zheng; Du, Chenglie; Li, Jianping; Qiu, Bingjing; Yang, Dong‐Yeol

doi:10.1016/j.powtec.2015.03.027

Cited by 33 publications

(18 citation statements)

References 18 publications

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“…Therefore, the underground coal-waste separation equipment should have the characteristics of small volume, be explosion proof, and have strong practicability, good separation effects and high reliability. At present, the underground coal-waste separation methods include the coal-waste selective crushing methods, dense medium shallow groove methods, vibro-assisted jigging methods, water separation methods and ray identification methods [36,37].…”

Section: Main Underground Coal-waste Separation Methods and Equipmentmentioning

confidence: 99%

Overview of Solid Backfilling Technology Based on Coal-Waste Underground Separation in China

Zhang¹,

Zhang²,

Wu³

et al. 2019

Sustainability

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China is the world’s largest coal producer country. However, large-scale coal mining has led to severe environmental pollution issues such as surface subsidence and gangue piling up. The gangue discharging amount has ranked the first in the world and coal mine enterprises are facing enormous discharging reduction pressure. This paper summarizes the research progress of the solid backfilling mining technology and then illustrates the realistic demands and significance of implementing underground coal-waste separation. It also focuses on the technical principles, systems and key equipment of the common underground coal-waste separation methods, such as the selective crushing method, the dense medium shallow groove method, the vibro-assisted jigging method and full-size water separation method and ray identification method. In addition, the selection steps of underground coal-waste separation method, the design process of large section separation chamber and the design principle of separation and backfilling system are proposed, finally, the mining-separating-backfilling + X for coal mining is put forward. By combining the technology of mining-separating-backfilling with other technologies, such as gob-side entry retaining with non-pillar mining, gas extraction, solid waste treatment, water protection mining, mining under buildings, railways and water bodies, the integrated mining methods, mining-separating-backfilling + setting pillars, gas drainage, treatment, protection and prevention methods are formed. It also introduced the ‘mining-separating-backfilling + gas extraction’ technology’s whole idea, system arrangement, separation equipment and practical engineering application effects based on the specific engineering case of pingmei no. 12 coal mine. The results indicate that the integration of underground coal-waste separation and solid backfilling technology could achieve gangue discharging reduction, underground washing and surface subsidence control. It is effective at realizing green mining.

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Section: Main Underground Coal-waste Separation Methods and Equipmentmentioning

confidence: 99%

Overview of Solid Backfilling Technology Based on Coal-Waste Underground Separation in China

Zhang¹,

Zhang²,

Wu³

et al. 2019

Sustainability

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show abstract

“…Ma et al proposed the coal gangue on-line recognition and automation selection system with digital image processing technology [4]. Zheng et al studied the pneumatic separation of coal and gangue based on the machine vision system [5]. Figure 2 shows a design of an automated coal-gangue separation system by using the computer vision technology [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…The separation of coal and gangue based on the computer vision method can be divided into the following steps [5]:…”

Section: Introductionmentioning

confidence: 99%

“…Determine the size and the location of gangue, and then convert these information to the control signals of high pressure air nozzle. Figure 2 shows a design of an automated coal-gangue separation system by using the computer vision technology [5,6]. In addition, it is interesting to note the feasibility of implementation of image recognition techniques since we could directly modify the current devices from dry techniques by replacing the γ-rays or X-rays with industrial cameras.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Extraction of Coal and Gangue Geometric Features with Multifractal Detrending Fluctuation Analysis

2018

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Abstract:The separation of coal and gangue is an important process of the coal preparation technology. The conventional way of manual selection and separation of gangue from the raw coal can be replaced by computer vision technology. In the literature, research on image recognition and classification of coal and gangue is mainly based on the grayscale and texture features of the coal and gangue. However, there are few studies on characteristics of coal and gangue from the perspective of their outline differences. Therefore, the multifractal detrended fluctuation analysis (MFDFA) method is introduced in this paper to extract the geometric features of coal and gangue. Firstly, the outline curves of coal and gangue in polar coordinates are detected and achieved along the centroid, thereby the multifractal characteristics of the series are analyzed and compared. Subsequently, the modified local singular spectrum widths ∆h of the outline curve series are extracted as the characteristic variables of the coal and gangue for pattern recognition. Finally, the extracted geometric features by MFDFA combined with the grayscale and texture features of the images are compared with other methods, indicating that the recognition rate of coal gangue images can be increased by introducing the geometric features.

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“…At present, scholars concentrate on separation of coal from rock partings [9][10][11] when investigating the mining of such coal seams. They illustrate that coal is isolated from rock partings by using multiple methods, such as increasing the number of devices used in its transportation, and then the rock parting is transported to the ground after being stored in a storage bin.…”

Section: Introductionmentioning

confidence: 99%

Innovative Extraction Method for a Coal Seam with a Thick Rock-Parting for Supporting Coal Mine Sustainability

Zhang

Quan

et al. 2017

Sustainability

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Abstract:As thick rock partings delay the efficient mining of coal seams and constrain the sustainable development of coal mines, an innovative extraction method for a coal seam with thick rock parting was proposed. The coal seams were divided into different sub-zones according to the thickness of rock parting and then the sub-zones were mined by separately using three mining schemes involving full-seam mining, combined mining using backfill and caving (CMBC), and reducing height mining. Afterwards, the study introduced the basic mechanism and key devices for the CMBC and analysed the working state of the backfill support in detail. Moreover, the method for calculating the length of the backfill zone was proposed to design the length of backfill zone and the influences of four factors (including bulking coefficient) of rock parting on the length of the backfill zone were also explored. By taking the No. 22203 panel, Buertai mine, Inner Mongolia, China as an example, the mined coal resource by using the CMBC extraction method will increase by 1.83 × 10 6 tons and the recovery ratio will rise from 56.2% to 92.4% compared with mining of the 2-2 upper coal seam alone. Moreover, by applying CMBC, a series of environmental and ecological problems caused by rock parting is reduced, which can improve the environment in mined areas. The research can provide technological guidance for mining panels of a coal seam with a thick rock parting and the disposal thereof under similar conditions.

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Underground pneumatic separation of coal and gangue with large size (≥50mm) in green mining based on the machine vision system

Cited by 33 publications

References 18 publications

Overview of Solid Backfilling Technology Based on Coal-Waste Underground Separation in China

Overview of Solid Backfilling Technology Based on Coal-Waste Underground Separation in China

Extraction of Coal and Gangue Geometric Features with Multifractal Detrending Fluctuation Analysis

Innovative Extraction Method for a Coal Seam with a Thick Rock-Parting for Supporting Coal Mine Sustainability

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