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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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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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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Coal supply, coal demand, coal quality, and the assignment of specific types of coals to individual coal fired generating units are the four key components of the endogenous coal market …
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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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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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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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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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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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Elemental Sulphur Market Specifications. The largest single use of sulphur is for the production of sulphuric acid. Other uses are in the paper, rubber, and fertilizer industries. Ordinary lump sulphur should have a guaranteed sulphur content of 99.5 per cent and be practically free of arsenic, selenium, lead, copper, zinc, iron, and moisture.
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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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methods are widely used in the field of coal and gangue classification.2 By use of the density differencebetween coal and gangue, the effectof stratifiedseparation is realized. In the ... sulfur content, and volatility of coal. Cao et al.10 used a combination of LIBS and KNN to classify coal types based on 11 elements
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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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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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With the increasing depletion of natural resources, many researchers are committed to the development and utilization of CG as a "new resource", for raw materials and products [1], [2].In addition its high iron and sulfur contents, the potential environmental hazards of CG include compounds containing heavy metals, including Zn, Ni, Co, V, Cr, Mn, Se, etc [3], [4].
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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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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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However, online detection of the coal content in gangue is currently unfeasible. A high coal content in gangue not only leads to a decline in the yields of clean coal but also reduces the economic benefits of an enterprise. Usually, coal content in gangue is measured by sampling and the float-sink test; this requires considerable time and effort.
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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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DOI: 10.1016/J.JCLEPRO.2017.11.162 Corpus ID: 158282432; A novel dry beneficiation technology for pyrite recovery from high sulfur gangue @article{Duan2018AND, title={A novel dry beneficiation technology for pyrite recovery from high sulfur gangue}, author={Chenlong Duan and Chenyang Zhou and L. Dong and Yuemin Zhao and Qingxia Liu and Qingxia Liu}, …
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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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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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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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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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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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Coal gangue samples were collected from Shenfu Coal Mine, Shaanxi Province, China. 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 ...
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In some cases, such as CG-2, CG-6 and CG-15, the sulfur as sulfate content significantly exceeded the sulfur as sulfide content and reduced accordingly the sulfur as sulphide content. If we consider only sulfide sulfur contents and < 0.3% as a target for desulfurization, 12 out of 18 samples met the target.
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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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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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