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  • Effect of organic matter on the Rietveld quantitative

     · I. INTRODUCTION Coal gangue (CG) produced from coal mining and coal processing is one of the largest amounts of industrial solid wastes in China (Liu and Liu Reference Liu and Liu 2010).More than 700 million tons of CG is generated annually in China and its resource utilization attracts many researchers attention (Bian et al. Reference Bian Dong Lei Leng Mu and Wang 2009 National

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  • Fei Hua Yang Scientific

    Abstract In this paper the Neimenggu high alumina coal gangue was calcined at 400°C 1000°C its micro-structure in different calcining temperature was studied using XRD and IR and then the preferred activated condition and the PAI were investigated by testing the strength of cement mortars with activated coal gangue.

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  • Yuzhuang SUN Vice President Dr. Professor Hebei

    The weighted mean concentrations of S As Hg and F in coal gangue are 1.01 7.98 0.18 and 365.54 mg/kg respectively. Amounts of S As Hg and F emissions from coal gangue spontaneous comb

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  • 5 Xingang Yu Hongfei Wang Yuexiang Li Yi Gong Dejun Li Jianxiong Ye Dong Shu Ming Wei. Study on the High Performance Coal Gangue Foam Concrete. Materials Science forum

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  • Dielectric and geometric feature extraction and

    Aiming at the problems of difficult feature extraction and low recognition accuracy of coal and gangue this paper proposes a recognition method based on dielectric and geometric features which uses variational mode decomposition (VMD) to denoise the response signal to obtain its dielectric features uses the marked watershed method to segment the image boundary to obtain its geometric features.

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  • China Coal Technology and Engineering Group Chongqing Research Institute Chongqing 400037 China Online Published

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  • 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 gangue at different weathering degrees were collected from a coal mine named Suncun an over 100

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  • Image Recognition of Coal and Coal Gangue Using a

     · the recognition of coal and coal gangue is a key part of the screening step which can also be regarded as the most crucial segment of automatic coal separation technology. Traditional coal/gangue separation technologies include manual separation machine

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  • Conversion of coal gangue into alumina tobermorite and

     · A large amount of coal gangue from coal mining and processing is regarded as waste and usually stockpiled directly. In order to recycle the valuable elements from the coal gangue an integrated process is proposed. The process consists of three steps 1) concentrating alumina from the coal gangue via activation roasting followed by alkali leaching of SiO2 which produces alumina concentrate for

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  • Image Recognition of Coal and Coal Gangue Using a

     · the recognition of coal and coal gangue is a key part of the screening step which can also be regarded as the most crucial segment of automatic coal separation technology. Traditional coal/gangue separation technologies include manual separation machine

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  • Study on Low Temperature Crack Resistance of Coal

    The improvement mechanism of coal gangue powder and polyester fiber on low tempe-rature crack resistance of asphalt mixture was analyzed by SEM. Through experiments the optimum amount of polyester fiber is 0.4 for SCB specimens with no pre-cut and the optimum replacement rate of coal gangue powder is 50 for SCB specimens with pre-cut the

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  • Source Alkali-Leached from Coal Gangue Synthesis of

     · Source Alkali-Leached from Coal Gangue Jing Yang Xin Zhang Yuqin Liu Hongwen Ma Wuwei Feng Cheng Zeng This research work has developed an efficient route to produce ultrafine silica powder using coal gangue as the silica source including mainly three steps. The first step is the 3.2 Extraction of Silica Component from CCG

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  • Improved extraction of alumina from coal gangue by

     · 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.

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  • Coal Gangue Image Edge Detection Based on Wavelet

    An edge detection algorithm is developed for coal gangue images and the method has two advantages compared with traditional ones. Firstly multi-resolution analysis of wavelet transform can improve the quality of edge detection. Secondly the algorithm is faster for real time. Since the threshold directly from the coefficients of wavelet transform the rate of recognition for coal gangue is

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  • Songqiang XIAO Chongqing University Chongqing CQU

    Water jet drilling (WJD) technology is a highly efficient method to extract coalbed methane from reservoirs with low permeability. It is crucial to efficiently remove the coal fragments while

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  • Fei Hua Yang Scientific

    The activity of the original gangue is very high the PAI of the cement mortars with 800°C activated coal gangue can achieve to 126 and thus can be used as high activity cement admixture. The PAI of the high alumina gangue is higher than that of coal gangue from other parts of China.

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  • Image Recognition of Coal and Coal Gangue Using a

    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.

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  • PHU et aliopscience.iop

     · the coal industry. 2. Methods 2.1. Synthesis of coal gangue geopolymer For the determination of the effect of the synthesis conditions on the sorption capacity of the CGGP two values were used for each of the variables to be studied geopolymerization temperatures of 70 °C and 90 °C SiO 2/Al 2O 3 ratio of 3.3 and 4.5 SiO 2/Na

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  • Zhen LI Lecturer Doctor of Engineering Taiyuan

    Zhen Li is now working at College of Safety and Emergency Management Engineering Taiyuan University of Technology. He received his B.Eng. and B.Ec. from Shandong University of Science and

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  • Research of Comprehensive Utilization of Coal Gangue

    Calcined coal gangue powder was used to partially replace Portland cement (PC) at 10 20 30 and 40 by weight. The water to binder ratio (w/b) of 0.5 was used for all the blended cement paste

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  • Image Recognition of Coal and Coal Gangue Using a

    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.

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  • Energy Exploration Exploitation Geochemistry of

     · powder diffraction and scanning electron microscopeenergy dispersive X-ray spectrometer. The minerals in coal mainly consist of kaolinite pyrite calcite and quartz as well as small amount of gypsum and anatase. Compared with the average elemental concentrations in world coal the

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  • Songqiang XIAO Chongqing University Chongqing CQU

    Water jet drilling (WJD) technology is a highly efficient method to extract coalbed methane from reservoirs with low permeability. It is crucial to efficiently remove the coal fragments while

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  • Solidification/stabilization of municipal solid waste

     · In this paper an uncalcined coal gangue–based alkali-activated cementitious material was used to solidify the MSWI FA. The compressive strength of these cementitious materials was evaluated through different contents of alkali activators SiO 2 /Na 2 O molar ratios liquid/solid ratios and curing temperatures by utilizing a single-factor

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  • Research on Coal Gangue Identification by Using

    Lingling Su et al 19 proposed an algorithm to recognize the Coal/Gangue by using the (CNN) and development has been done based on the Yann LeCun s LeNet

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  • Extraction of alumina from alumina rich coal gangue by a

    Introduction

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  • PHWDOVSROOXWLRQIURPDFLGLFFRDOJDQJXHZLWK

     · extraction and process. In China the total accumulation of coal gangue has exceeded 5 billion tons and the data continues to grow with a 300 to 350 million tons per year. It was estimated that coal gangue production will reach 790 million tons in 2020 making coal gangue became a huge environmental concern in China 3 .

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  • Mineralogical and Geochemical Characteristics of Lithium

     · China 24–29 and United States 30–33 . Research on extracting REY from coal and coal by-products was recognized by the U.S. Department of Energy (DOE) in 2015 34 . Taggart et al. (2018) indicated that the combination of HNO3 leaching and NaOH roasting is a viable method to extract REY in Appalachian and Illinois Basin coal ashes 35 .

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  • Efficient Extraction of SiO2 and Al2O3 from Coal Gangue

    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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  • Compression of Aggregates of Acid-Leached Coal

    The compression mechanical properties of coal gangues subjected to acidic immersion were examined using a cylinder and a YAS-500 electrohydraulic servotesting system in order to investigate the effects of pH and particle size on its compaction stress-strain and stress-compaction relationships. The evolutionary trends of the leaching solution #x2019s pH at various immersion times during the

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  • Coal Gangue Image Edge Detection Based on Wavelet

    An edge detection algorithm is developed for coal gangue images and the method has two advantages compared with traditional ones. Firstly multi-resolution analysis of wavelet transform can improve the quality of edge detection. Secondly the algorithm is faster for real time. Since the threshold directly from the coefficients of wavelet transform the rate of recognition for coal gangue is

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  •  · Improved extraction of alumina from coal gangue by surface mechanically grinding modification Powder Technology 302(2016) 33-41. SCI 2 IF="""3.230 8 Yanxia Guo Kezhou Yan Li Cui Fangqin Cheng Helen H. Lou. Effect of Na2CO3 additive on the activation of coal gangue for alumina extraction International Journal of Mineral Processing 131(2014) 51-57.

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  • Explanation of heavy metal pollution in coal mines of

     · In the process of coal gangue surface accumulation and underground filling disposal the heavy metals contained in coal gangue will inevitably precipitate out and migrate which will cause serious environmental pollution. Seventy-five gangue samples of different geological ages are obtained from 25 coal mines in China. The contents of Hg Pb Cd Cr As Cu Zn Mn Se and Be in gangue

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  • Selenium in Chinese coal gangue Distribution

     · Coal gangue is considered a by-product of coal mining cleaning and utilization. Coal gangue accounts for a large proportion of the solid waste in China and is generated via coal washing and mining procedures which account for approximately 10–15 of raw coal production (Zhou et al. 2014c).The rapid growth of coal consumption and production has resulted in approximately 850 million tons of

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  • PHWDOVSROOXWLRQIURPDFLGLFFRDOJDQJXHZLWK

     · extraction and process. In China the total accumulation of coal gangue has exceeded 5 billion tons and the data continues to grow with a 300 to 350 million tons per year. It was estimated that coal gangue production will reach 790 million tons in 2020 making coal gangue became a huge environmental concern in China 3 .

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  • Solidification/stabilization of municipal solid waste

     · In this paper an uncalcined coal gangue–based alkali-activated cementitious material was used to solidify the MSWI FA. The compressive strength of these cementitious materials was evaluated through different contents of alkali activators SiO 2 /Na 2 O molar ratios liquid/solid ratios and curing temperatures by utilizing a

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  •  · Improved extraction of alumina from coal gangue by surface mechanically grinding modification. Powder Technology 2016 302 33–41. (SCI 2) 3.Yanxia Guo Huibin Lv Xi Yang Fangqin Cheng AlCl3 6H2O recovery from the acid leaching liquor of coal gangue

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  • 5 Xingang Yu Hongfei Wang Yuexiang Li Yi Gong Dejun Li Jianxiong Ye Dong Shu Ming Wei. Study on the High Performance Coal Gangue Foam Concrete. Materials Science forum Vols.(2009) pp .

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  • Rare Earth Elements from Coal and By- Products

     · Purpose Utilize advanced characterization to develop innovative extraction and enrichment technologies to unlock the potential of coal to create a domestic REE/CM industry. Strategic Alignment 1. Economic and Energy Security through the production of minerals critical to domestic industries and which underpin the energy technologies of the

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  • CharacterizationandIdentificationofCoalandCarbonaceous

     · Coal is the main energy source in China and still the ir-replaceable main energy in the foreseeable future. Carbo-naceous shale which is sandwiched in coal seam and was formed during coal formation is mainly composed of mineralsandorganiccarbon.Duringthecoalproduction lots of carbonaceous shales which are the main part of

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