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Prediction of density and sulfur content level of high-sulfur coal
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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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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Experimental evaluation of the effect of sulfur content on the
Semantic Scholar extracted view of "Experimental evaluation of the effect of sulfur content on the spontaneous combustion characteristics parameters of coal" by Qinghu Zhang et al. ... Experimental Study on Constructing a Classification and Early Warning Index System for Non-Stick Coal Spontaneous Combustion ... The presence of pyrite poses a ...
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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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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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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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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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Characteristics of leaching of heavy metals from low-sulfur …
content in low-sulfur coal gangue is associated with greater, leaching of heavy metals; acidic conditions promote the release of heavy metals in low-sulfur coal gangue; and more precipitation is ...
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Detecting coal content in gangue via machine vision and genetic
Machine vision has been widely used in various industrial fields, particularly in the field of parameter detection. Qiu et al. [1] used an image analysis method to estimate the ash content in clean coal and identified seven features according to the gray histogram of the coal image. Then, polynomial regression after feature selection (PRFS) and the support vector …
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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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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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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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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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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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Representative coal gangue in China: Physical and chemical …
Due to the main composition of CG are SiO 2, Al 2 O 3, etc., CG is often converted into a material with sustainable development through physical and chemical test methods.CG materials treated by physical and chemical methods are often used in road bases (Zhu et al., 2021), building materials (Wang et al., 2022a, Wang et al., 2022b; Zhang et al., 2022), and …
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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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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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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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Coal
Coal Type Heat Content (Btu/lb) Classification Bituminous >10,260 – 13,000 B Subbituminous > 7,500 – 10,260 S Lignite less than 7,500 L Table 7-3 Coal Grade SO 2 Content Ranges SO 2 ... on coal heat content, sulfur content, and geographic origin, which are used as a check against characteristics initially identified through the ICR.
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Coal and Gangue Classification Based on Laser-Induced …
Wet classification mainly includes hydrodynamic screen jigging classification and heavy medium classification, and these methods are widely used in the field of coal and gangue classification. 2 By use of the density difference between coal and gangue, the effect of stratified separation is realized. In the wet classification process, a large ...
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Coal and Gangue Classification Based on Laser …
The system demonstrated excellent performance in predicting the calorific value, sulfur content, and volatility of coal. Cao et al. used a combination of LIBS and KNN to classify coal types based on 11 elements in coal.
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A Novel Dry Beneficiation Technology for Pyrite Recovery. A …
Pyrite in the gangue was considered as the waste causing harmful environmental problems. It is of great significance to enrich pyrite from high sulfur gangue.
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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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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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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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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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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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Leaching law of heavy metals in coal gangue: A combination of
However, the resource utilization of coal gangue still faces several challenges, such as high sulfur content, nutrient deficiency, and heavy metal contamination [18], [19], [20]. The internal heat generated by the massive accumulation of coal gangue can lead to spontaneous combustion, producing many toxic and harmful gases in the absence of ...
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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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