Coal and Gangue Classification Based on Laser-Induced …

As depicted in Figure 1, two main methods can be employed for classifying coal and gangue: manual classification and automatic classification. In manual classification, the …

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A Bayesian optimal convolutional neural network approach for

The precise classification of coal and gangue is a crucial link for effective sorting and efficient utilization. ... as a companion of mining [3, 4], has the characteristics of low carbon content and hardness compared with coal. Gangue is mainly composed of SiO 2 and Al 2 O 3 [5], that contains not only a lot of sulfur (S), but also a lot of ...

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Research on coal gangue classification recognition method …

A coal gangue recognition method (CNN-SVM) based on the combination of convolutional neural network (CNN) and support vector machine (SVM) is proposed, which has obvious advantages compared with traditional classification models and classical classification models, and the recognition speed is faster compared with the mainstream classification …

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GB/T 29162-2012 English PDF

Category 4 classification 4.1 Classification according to total sulfur content Gangue at low total sulfur, medium, high, high divided into four categories, corresponding coded as …

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A short review of the sustainable utilization of coal gangue in

This review highlights the significance of coal gangue classification according to its properties for the comprehensive utilization of gangue. ... Results showed that the treatment with 70-mesh high-sulfur coal gangue was most effective, and with ... Similarly, when coal gangue is used in brick production, it is important to detect sulfur ...

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CN203917158U

The utility model discloses the anhydrous screening installation of gangue inorganic sulfur in a kind of X ray clean coal.Technical essential of the present utility model is, it comprises electric appliance interlocker able to programme, raw coal lump coal feed system, the large grade straight-line oscillation screen system being arranged on four different altitude heights, gangue …

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Sulfur as a parameter in the suitability assessment of gangue …

Studies of sulfur content in the samples should be carried out with sufficient periodicity and in a manner enabling to obtain most reliable results which would refer to the entire batch of material.

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Ore and gangue mineral textures, fluid inclusions, mesoscopically

This paper provides comprehensive analyses of mineral microtextures, nanoparticulate electrum, defective crystal structures of key primary hydrothermal minerals - quartz and pyrite, the bulk sulfur isotopic composition of pyrite and marcasite, and fluid inclusions in hydrothermal quartz and calcite, all aimed at characterizing ore mineralization. The study …

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Soil sulfur cycle bacteria and metabolites affected by soil depth …

Coal gangue with a sulfur content >2 % (w/w) is commonly referred to as high-sulfur coal gangue and is a vital sulfur deposit in nature ... The classification of metabolites in the top 100 abundances in all samples is shown in Fig. 4 B and predominantly included amino acids, peptides, and analogues (19), arylsulfates (10), carbohydrates and ...

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GitHub

,,：train, predict, model。 pytorch。, ...

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(PDF) Sulfur as a parameter in the suitability assessment of …

Total and leachable forms of sulfur content from gangue samples were analyzed in the study. It has been shown that it is possible to select aggregates which are safe for the …

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Experimental evaluation of the effect of sulfur content on the

This is because when the sulfur content of coal is lower than 5.13 %, the sulfur and its unstable compounds in coal can react with oxygen and release heat at low temperature, thus generating more CO gas; When the sulfur content of coal is higher than 5.13 %, the coal sample contains a large amount of sulfur structure covering the coal surface ...

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Coal Gangue Utilization: Applications, Challenges, and

It is classified into four categories based on total sulfur content: low, medium, medium-high, and high, as shown in Table 1. This standard specifies the classification …

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Sulfur of Mixed Coal and Gangue during Combustion in a …

The sulfur content of coal gangue is within 1–3%, which is classified as medium‐high sulfur coal. Its output accounts for about 10%–20% of the raw coal output [3]. Generally, gangue with a calorific value higher than 1200 kcal is

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A Bayesian optimal convolutional neural network approach for

Gangue, as a companion of mining [3,4], has the characteristics of low carbon content and hardness compared with coal. Gangue is mainly composed of SiO 2 and Al 2 O 3 [5], that contains not only a lot of sulfur (S), but also a lot of heavy metal elements. When coal is used as fossil fuel, if coal is doped with gangue, it will reduce the ...

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Ore, Composition and Classification of | SpringerLink

Gangue minerals are mainly nonmetallic minerals, but also include metal minerals that have no comprehensive utilization value due to their low content, such as pyrite, galena, and sphalerite in copper ores. The proportion of ore minerals and gangue minerals varies with ore types and with rich and poor mineral grades in the same ore.

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Estimate of sulfur, arsenic, mercury, fluorine emissions due to

The content of sulfur, arsenic, mercury, and fluoride in coal gangue samples (including roof, parting, floor, and mixed coal gangue) in this study is listed in Table 1. Some …

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Coal image features. | Download Table

To estimate the density and sulfur content level of high-sulfur coal, a novel approach based on image processing and the support vector machine optimized by Grey wolf optimization (GWO-SVM) was ...

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Changes in microbial community structure during the biooxidation …

The results of XRD and SEM analyses showed that not only were the iron sulfur minerals in the gangue dissolved by oxidation under the action of microorganisms, but new iron‑sulfur minerals, such as jarosite and schwertmannite, were formed on the surface of the gangue. Interestingly, the sulfur content determination using XPS analysis showed ...

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Enhancing the carbon content of coal gangue for composting …

Based on the classification standard of GBT 29162-2012, the coal gangue used in this study was categorized as low-sulfur coal gangue (total sulfur [S t,d] <1 %). The content of heavy metals in the coal gangue was substantially lower than that in the Chinese agricultural soil control standard (GB15618-2018; Table 1), indicating that there was no ...

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Research on image classification of coal and gangue based on a

For example, Hong et al. proposed a method based on AlexNet architecture and transfer learning to identify coal and gangue automatically. 18, 19 Su et al. improved the LeNet-5 model by enhancing the activation function, network depth, and the size and number of convolutional kernels to improve coal and gangue classification accuracy. 20, 21 Pu ...

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A short review of the sustainable utilization of coal gangue in

The SiO 2 content ranges from 30–40%, while the CaO content is significantly higher compared to other types of coal gangue, at approximately 10–45%. High-aluminum coal gangue is …

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Classification of coal and gangue under multiple surface conditions via

The experiments of coal and gangue classification under multiple conditions are performed using the test rig depicted in Fig. 2 where 1 denotes a computer, 2 denotes an LED (four lights in total), 3 denotes a camera, and 4 denotes a sunshade. ... Prediction of density and sulfur content level of high‑sulfur coal based on image processing ...

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Rapid quantification of lignite sulfur content: Combining optical …

Traditionally, lignite production has relied upon laboratory analysis for determination of S content in the mined coal, for example, Methods D3177, D4239 (American Society for Testing and Materials (ASTM), 2007, American Society for Testing and Materials (ASTM), 2019).Sulfur content can vary considerably across deposits owing to a number of factors imbued at the time …

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Study on the separation mechanism of coal and gangue particles …

The solid concentration is one major factor in determining the partition curve of the hydrocyclone. The two-stage hydrocyclone classification circuit has been applied to strengthen the classification of -37um fraction with high ash content and reduce the misplacement of fine particles into underflow caused by the particle density effect [31].

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Image segmentation of coal and gangue.

To estimate the density and sulfur content level of high-sulfur coal, a novel approach based on image processing and the support vector machine optimized by Grey wolf optimization (GWO-SVM) was ...

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Flow chart of detecting coal content in gangue.

Download scientific diagram | Flow chart of detecting coal content in gangue. from publication: Detection of coal content in gangue via image analysis and particle swarm optimization–support ...

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High-capacity utilization of coal gangue as

Furthermore, substantial CG accumulation has given rise to severe pollution and degradation of air, land, water resources, and ecosystems (Fig. 3) [3].In regions exposed to direct sunlight, the internal heat of the CG gradually accumulates to its ignition point, leading to spontaneous combustion and the emission of harmful gases, such as sulfur dioxide and …

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Comprehensive study on the spatial distribution of heavy metals …

Based on this, we selected a high-sulfur CG discharge site (6.08% sulfur content) from Shanxi Province, the coal base in China (Cao, 2017). The level of HMs enrichment and ecological risk at the site were assessed by the widely used Nemerow index ( Zhao et al., 2020 ), geo-accumulation index ( Sun et al., 2019 ), and potential ecological risk ...

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Lightweight detection model for coal gangue identification based …

Sun and Chen [] decomposed coal rock images based on double-tree complex wavelet transform and completed image identification based on relative entropy similarity.Li et al. [] built a coal gangue sorting image capture system, and the test results of coal and gangue classification accuracy were 90.3% and 83.0%, respectively.Xue et al. [] proposed a coal …

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