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Fluoride is widely distributed in the atmosphere, originating from the dust of fluoride containing soils, industry and mining activities, and the burning of coal. The fluoride content in the air in non-industrialized areas has been found to be low and is not considered to contribute more than 0.01 mg/day to the total intake.
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Therefore, this model can be applied to predict the fixed carbon content of coal gangue in coal mines and can help guide mine safety and environmental protection, and it presents the advantages of being economic, rapid and e cient. Keywords: coal gangue; thermal infrared; fixed carbon content; quantitative inversion 1. Introduction Gangue is the main solid waste in coal mine areas. In China ...
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Fixed carbon content is an important factor in measuring the carbon content of gangue, which is important for monitoring the spontaneous combustion of gangue and reusing coal gangue resources. Although traditional measurement methods of fixed carbon content, such as chemical tests, can achieve high accuracy, meeting the actual needs of mines via these tests is diffcult because the measurement ...
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The mineral compositions of the coal gangue, fired coal gangue, and CSFGM derived from spontaneous combustion were analyzed using X-ray diffraction (XRD, Bruker AXS D8-Focus X-ray diffraction, Karlsruhe, Germany). Although the lithology of coal spoil samples include limestone, shale, and sandstone, over 99% of the fired coal spoils belong to sandstone, …
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Coal gangue is a typical waste produced during coal mining and washing. Synthesis of zeolites via coal gangue can contribute to resource recycling and environmental protection. In this study, high-silica SSZ-13 was synthesized by one-step hydrothermal synthesis from coal gangue without the traditional pretreatment methods of high-temperature roasting and alkali melting, making it more ...
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The content of SiO 2, Al 2 O 3, and S in the weathered coal gangue was lower than that in the fresh coal gangue, while the content of P was slightly higher. Chemical elements contain a small amount of Mn, Cu, Zn, Ti, Ba, Cl, and other elements, among which the content of Mn is the highest. Moreover, the contents of each element in coal gangue reduced after weathering. …
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Fluoride pollution in groundwater and soil occurred in the air depositing areas of coal spoils. The average content of fluorine in coal spoils was 525mg/kg with …
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Polysilicate aluminum was prepared. from fly ash in coal-fueling power plant, and used as defluorider and coagulant in the treatment of fluoride wastewater in coal-fueling power plant by chemical deposition, complexation, agglomeration and flocculation. The results show that this method is more simple for operation and has lower operational cost.
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Coal gangue, sulphuric acid with 98% in mass and calcium fluoride were used as starting materials. The phase, chemical structural characteristic and the morphology of production were investigated by infrared spectrophotometry, XRD and TEM, respectively. The main effect facts of production yield was systematically discussed. Results show that the maximum production …
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The coal and gangue recognition technology by means of natural ray determines the gangue content in coal and gangue mixture stream based on the natural radiation intensity of gangue The measured data is not influenced by the coalgangue size or the environment around the coal caving opening therefore it has certain advantages. See Details > Application of EMDBased …
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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 ...
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in some communities in China where coal containing very high levels fluoride is burned indoors. Absorption of ingested fluoride is via the stomach and small intestine (IPCS 2002). Most of the fluoride in water, either naturally occurring or added, will be in the form of the free fluoride ion (IPCS 2002). The effect of water hardness in the range 0 to 500 mg Ca Co3 /litre has little effect on ...
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The invention discloses a method for preparing silicon/aluminium series product by taking gangue as a raw material, which is characterized in that gas or solid fluorinating agent is employed for high temperature fluorination calcination on gangue, easily volatile silicon fluoride and nonvolatile AlF3 are generated, so that effective separating of silicon and aluminium is realized.
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The use of high fluoride-content coal caused the severe coal-burning endemic fluorosis in Zhijin County, Guizhou Province, China. The long-term mine exploitation in this region is as an important source of acid mine drainage (AMD) and leads to the release of potential fluoride (F−) into the surrounding waters. Aiming to investigate the source, hydrogeochemical …
GET PRICELi said in the past, coal mine in Shuozhou city in Shanxi, where Anpeak Specialty Minerals is based, could produce over 30 million tons of coal gangue per …
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The coal gangue was crushed to <2 mm and dried until the moisture content was below 1%, then it was ground by a SMφ500 mm×500 mm laboratory ball mill, the load of the mill was 5 kg, the fitness of coal gangue was 0.08mm after grinding, and the residue after screened by a square-hole sieve was less than 8%, then it was calcined in a CD- 1400X muffle furnace (the calcination temperature was ...
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Coal gangue is a typical waste produced during coal mining and washing. Synthesis of zeolites via coal gangue can contribute to resource recycling and environmental protection. In this study, high-silica SSZ-13 was synthesized by one-step hydrothermal synthesis from coal gangue without the traditional pretreatment methods of high-temperature roasting and alkali melting, making it more ...
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This invention relates to a method for preparing mullite by calcining coal gangue. The method comprises: (1) mixing coal gangue powder and additive uniformly; (2) heating the mixed raw materials at a rate of 2-10 deg.C/min to 1300 deg.C, and keeping the temperature for 3h to obtain the product. The additive is composite catalyst of NaF and La2O3.
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The contents of heavy metals in coal gangue samples from the Jiulong Coal Mine are presented in Table 1. The contents of heavy metals in the coal gangue are Ba>Mn>Zn>Cu>Cr>Pb>Ni>Be>Cd. The Ba content is much higher than other heavy metals and up to 616 mg/kg. The contents of Mn, Zn, Cu, Cr, Pb, Ni are 460 mg/kg, 78 mg/kg, 60 mg/kg, 47mg/kg, 20 mg/kg, 16 mg/kg, respectively. The content …
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Coal gangue is one of the largest industrial residu It has high ash content, low carbonaceous content, and heating value Meanwhile, it has some trace elements Large quantities of coal gangue cause serious environmental problems by polluting the air, water, and soil as well as occupying a tremendous amount of land Now, coal gangue utilization is a matter of great concern and has,
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