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In order to improve the recovery ratio of top-coal, a lot of work has been done on coal-gangue interface detection (CID) [1 – 3]. This paper proposes a new CID method based on the analysis of vibration signals due to the collapse of coal and gangue onto the tail boom of a longwall mining machine. Some significant features that differ between ...

Exposure of heavy metals in coal gangue soil, in and

The BCR sequential extraction scheme (BCR-SES) was carried out to determine the different chemical profiles of heavy metals in coal and coal gangue soil samples. For comparative purpose time saving conventional single step extraction (CSE) and vortex assisted single step extraction (VSE) schemes based on same working setting used BCR extraction scheme.

Extraction of alumina from alumina rich coal gangue by a

1. Introduction. Coal gangue is an industrial solid waste produced by coal mining and processing [1–3].The average production of gangue accounts for 10–15% of raw coal production [4,5], making coal gangue one of the biggest solid wastes in China.At present, utilization ratio of coal gangue can reach about 60% in some countries.

Improved extraction of alumina from coal gangue by surface

Nov 01, 2016 Coal gangue, a type of kaolinite clay in coal measures, is one of the largest categories of solid industrial wastes in China. Alumina extraction from coal gangue could offer an alternative to bauxite as a source of alumina. Mechanically modification by grinding is an effective activation method to improve alumina recovery from coal gangue.

(PDF) Identification of Coal and Gangue by Feed forward

The above coal and gangue separating methods mainly rely on manual extraction of feature values with dependence on experience and knowledge, which are subjective and limited [20].

Characterization of heavy metals in coal gangue reclaimed

Mar 01, 2018 The Huainan coal mining area is a typical coal mining area with high phreatic water level, and water accumulation in the coal-forming subsidence areas is serious (Yao et al., 2010). The long-term water-rock interaction between water and gangue might lead to migration and transformation of heavy metals, causing heavy metal enrichment in coal ...

(PDF) COAL MINING METHODS ResearchGate

Surface mining and deep underground mining are the two basic. methods adopted for mining coal. The choi ce of mining method depends primaril y on depth of burial, density of the overburden and ...

Coal mining Choosing a mining method Britannica

Bituminous seams (approximately 65 percent) are mined in roughly equal proportions by both methods. Surface mining. Surface coal mining generally involves the following sequence of unit operations: (1) clearing the land of trees and vegetation, (2) removing and storing the top layers of the unconsolidated soil (topsoil), (3) drilling the hard strata over the coal seam, (4) fragmenting or blasting the hard strata …

CN101450811A Method for extracting alumina from coal

The invention mainly relates to a method for extracting alumina from coal gangue. The coal gangue is ground, and then is calcined through a fluidized furnace and iron is removed through a magnetic separator, the coal gangue with the iron removal reacts with an acid to obtain an aluminum chloride solution without silicon impurities, the solution containing the aluminum is concentrated and ...

Application of EMD Based SVD and SVM to Coal Gangue

Coal-gangue interface detection during top-coal caving mining is a challenging problem. This paper proposes a new vibration signal analysis approach to detecting the coal-gangue interface based on singular value decomposition (SVD) techniques and support vector machines (SVMs). Due to the nonstationary characteristics in vibration signals of the tail boom support of the longwall mining …

Image Recognition of Coal and Coal Gangue Using a

Downloadable! Recognizing and distinguishing coal and gangue are essential in engineering, such as in coal-fired power plants. This paper employed a convolutional neural network (CNN) to recognize coal and gangue images and help segregate coal and gangue. A typical workflow for CNN image recognition is presented as well as a strategy for updating the model parameters.

Effects of Fine Gangue on Strength, Resistivity, and

The cemented coal gangue backfill (CGB) in coal mining is normally made of gangue (particle size of 0–15 mm), fly ash, cement, and water. In this study, the effects of the weight content (ranging from 20% to 60%) of fine gangue (0–5 mm) on the microscopic characteristics, resistivity, and compressive strength of CGB were investigated at 3 d and 28 d curing times, respectively.

Applied Mechanics and Materials Vols. 411 414 p. 22

The method using coal gangue were put down in the process of coal gangue on the difference of the characteristics of the acoustic signal recognition, first of all, using Mel frequency cepstrum coefficient will after denoising coal gangue acoustic signal transformation to the frequency domain processing, extracting the 32 d characteristic ...

Surface Mining Methods and Equipment

methods and practices as commonly employe d in modern surface mining operations. The ... expensive surface mining method. Highwall mining is a coal mining method for recovery of outcropped coal by mechanical excavation without removal of overburden. A continuous miner with single or multiple

Coal mining World Coal Association

The coal industry takes the issue of safety very seriously; modern coal mines have rigorous safety procedures, health and safety standards and worker education and training. Methane released from the coal seam and surrounding rock strata during mining can present a high risk of explosion at concentrations in air of 5-15%.

Factors That Influence the Extraction of Polycyclic

Coal samples and carbonaceous mudstone were collected from the Huaibei coalfield, China, and experiments investigating the factors influencing the extraction of the sixteen US EPA (Environmental Protection Agency) priority polycyclic aromatic hydrocarbons (PAHs) were carried out. Different extraction times, solvents, and methods were used. Major interest was focused on finding optimum ...

1. Introduction

In order to improve the recovery ratio of top-coal, a lot of work has been done on coal-gangue interface detection (CID) [1 – 3]. This paper proposes a new CID method based on the analysis of vibration signals due to the collapse of coal and gangue onto the tail boom of a longwall mining machine. Some significant features that differ between ...

Separation Of Gangue From Coal Based On Histogram

Coal gangue is residual abandoned coal, produced after the pre-processing steps of mining. It is an amalgam of several unwanted substances. It is important to separate coal gangue from lump coal before fed to thermal power plants. In this paper, investigation on the fundamental characteristics of coal images and gangue images with digital image processing technology is proposed.

Extraction of Resources Geology

Mining is the extraction of valuable minerals or other geological materials from the earth from an orebody, lode, vein, seam, or reef, which forms the mineralized package of economic interest to the miner.. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, dimension stone, rock salt, potash, gravel, and clay. Mining is required to obtain any material that cannot ...

Efficient Extraction of SiO2 and Al2O3 from Coal Gangue by

Coal gangue is mainly composed of SiO2, Al2O3 and other components. It is a huge reserve of aluminum and silicon resources. The coal gangue stockpiles in China is more than 5 billion tons at present, of which contain Al2O3 more than 1 billion tons, SiO2 more than 2.5 billion tons. It will make supplement for the lack of bauxite resources in China to some extent by extracting Al2O3 with ...

An Innovative Method for Placement of Gangue Backfilling

Using gangue backfilling in underground coal mining not only controls the roof deformation in the gob area but also reduces the amount of mining waste rock. However, due to the limitations of the complicated engineering conditions, backfilling mining in the steep coal seam is not widely applied. In this study, a long-distance backfilling technology with a scraper winch for a steep coal seam ...

Assessment of heavy metal in coal gangue distribution

In the process of excavation and utilization of the coal gangue hill, gangue at different weathering degree was exposed to the environment, which can be harmful to the surroundings. In order to find the law of heavy metal release and to evaluate the potential ecological risk, five kinds of coal gang …

Research on Coal Gangue Identification by Using

May 27, 2018 Abstract: A237 at the problems of traditional coal gangue image recognition methods such as difficult extraction of artificial features and low accuracy of recognition, a method of automatic identification of coal gangue images by convolution neural network is proposed. Based on the classic convolution neural network LeNet-5, this method is improved from input sample size, activation …

Exposure of heavy metals in coal gangue soil, in and

Exposure of heavy metals in coal gangue soil, in and outside the mining area using BCR conventional and vortex assisted and single step extraction methods. Impact on orchard grass May 2020

Aluminum extraction from coal ash by a two step acid

aluminum extraction efficiency of the acid method (Wang et al., 2014), many researchers have studied alkali methods. However, the traditional Bayer ... heating value coal gangue was the feed for combus-tion in the range of 800 C to 900 C. The coal ash samples were crushed and dried for analysis of parti-

4 Coal Mining and Processing Coal Research and

The U.S. coal industry serves a vital role in the nation’s economy by producing fuel for more than half of its electricity. Despite the industry’s importance, industry financial data for 2005—the strongest year for the coal industry in recent years—shows that it is a relatively small industry with revenues totaling $20 billion to $25 billion and net income between $1 billion and $2 ...

Coal mining Underground mining Britannica

Modern underground coal-mining methods can be classified into four distinct categories: room-and-pillar, longwall, shortwall, and thick-seam. Room-and-pillar mining. In this method, a number of parallel entries are driven into the coal seam. The entries are connected at intervals by wider entries, called rooms, that are cut through the seam at ...

Coal gangue interface detection based on Hilbert spectral

The distribution of the Hilbert spectrum of top-coal caving is found to be more uniform than that of coal-gangue caving. A method of vibration feature extraction based on the information entropy of the Hilbert spectrum is presented. The Mahalanobis distance function is used to classify the caving states.

CN101450811A Method for extracting alumina from coal

The invention mainly relates to a method for extracting alumina from coal gangue. The coal gangue is ground, and then is calcined through a fluidized furnace and iron is removed through a magnetic separator, the coal gangue with the iron removal reacts with an acid to obtain an aluminum chloride solution without silicon impurities, the solution containing the aluminum is concentrated and ...

Extraction of Resources Geology

Mining is the extraction of valuable minerals or other geological materials from the earth from an orebody, lode, vein, seam, or reef, which forms the mineralized package of economic interest to the miner.. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, dimension stone, rock salt, potash, gravel, and clay. Mining is required to obtain any material that cannot ...

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