Chemical and mineralogical analysis Major and minor element analysis chemical composition in coal gangue and its post leached residues was conducted using XRF S4 PIONEER The test condition is Rh target 4 kW 60 kV 140 mA Be U of detection range and 250 μm of minimum analysis of micro zone
A total of 49 powdered coal samples certi ed by China Coal Research Institute CCRI were used in this experiment with a calori c value ranging from 2 28 103 Jg 1 to 32 50 103 J g 1 Table 1 The C1 C2 and V1 samples with lower calori c values belong to coal gangue
water and coal gangue includes physical and chemical interactions which have the potential to change the microstructure and mineral composition of coal gangue and reduce their mechanical properties Most previous studies have focused on physical methods to improve the stability of coal gangue
power plant of Xinyang Colliery e coal gangue and waste concrete act as the aggregate in the CWCGB Coal gangue is extracted from the gangue mountain of the Xinyang coal mine in Shanxi province which is categorized into ne 0–5mm and coarse 5–15mm gangue according to the particle size range e mineral composition and chemical
The histogram next to images are the grayscale histogram of coal and gangue respectively The histograms show the grayscale level distribution of the coal and gangue
Coal gangue is a heterogeneous material and the total concentrations of heavy metals Cd Pb Cu Cr and Zn in the surface i e weathered of the coal gangue dump were higher than deeper portions In order to make the gangue samples to be representative four samples from different depths depth=2 3 4 and 5m of the coal gangue dump were
A method of removing gangue materials from coal characterized by the steps of comminuting and sizing all of the material to have most particles of a size smaller than one hundred microns slurrying in an alcohol containing 1 to 4 carbon atoms thereafter separating by settling velocity separation into an overflow stream containing most of the valuable coal products for storage as a fuel or the
In a coal mine as an example and acquisiting more irregular and different particle sizes of coal and gangue were broken by static experiments and dynamic crushing experiment using the experimental data obtained pressure distribution and pressure distribution curve equation by equation to solve the crushing critical force FL of the size of 50
The chemical industry traditionally uses petroleum as its basic raw material but the use of coal as a feedstock is becoming more attractive as oil prices continue to rise especially in countries where coal is abundant Coal to olefins CTO processes are of particular interest because of the high demand for propylene and ethylene The
Abstract Based on the systematic analysis of the coal gangue in Weibei Coalfield such as petrologic characteristics chemical composition nutrient elements deleterious elements and the transformation and compared with the soil element content background values of Loess Plateau and national harmful materials controlling standards we conclude that the coal gangue in the Weibei
coal required for iron reduction In addition to the min eral composition XRD allows to assess the crystallite size which may impact the reactivity of a mineral This information allows tailoring the type and quantities of additives required to optimize processing conditions in the blast furnace Summary
Coal gangue is a by product of coal mining and washing and its discharge amount accounts for approximately 10–15 of total coal production 1 2 The coal gangue dump is formed by the direct storage of coal gangue and occupies a great deal of farmland and arable land resources 1 3 The active components contained in coal gangue such as combustible carbon pyrite and heavy metal sulphide
According to the classification of silicon aluminum oxide content the CGA raw belongs to clay rock gangue 35 and mineral components of the CGA raw mainly consist of quartz kaolinite and siderite Fig 1 Chemical composition of NA is mainly CaO
Shao et al 2014 used magnetic and self potential data to detect an underground coal fire in Xinjiang China Wang et al 2020b assessed the risk of coal gangue fires based on measurements of
The metal ions release and microstructure of coal gangue corroded by acid based chemical solution The metal ions release and microstructure of coal gangue corroded by acid based chemical solution Xue Qiang Lu Haijun Zhao Ying Liu Lei 00 00 00 Environ Earth Sci 2014 71 3235–3244 DOI 10 1007/sy O R I G IN AL ARTI CL E The metal ions release and
The Y 2000 X ray diffraction spectrometer was applied to detect the main chemical components of gangue The detection results are shown in Table 1 Fuxin coal gangue was classed as sandstone gangue consisting of quartz feldspar and illite minerals while lacking in high alumina mineral
U Chemical composition of shales and related rocks V Chemistry of carbonate rocks W Chemistry of iron rich sedimentary rocks by H L James X Chemistry of phosphorites Y Marine evaporites by Frederick H Stewart Z Continental evaporites AA Chemistry of coal BB Chemistry of petroleum natural gas and miscellaneous carbonaceous substances
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
deformation value of coal gangue as a damming material is 9 0 mm/m which is twice the maximum horizontal tensile deformation calculated by direct tension tests A series of laboratory tests such as petrographic composition chemical component leaching experiments and physico mechanical properties show than coal gangue is similar to
differences in chemical composition largely determined by the average atomic number AAN In cases where crushed or milled samples are studied com monly the case in the study of processing products the embedding media inter feres in the detection of organic matter because of the low contrast between or ganic matter and epoxy 18
Chemical composition and radiation safety of the coal gangue Table 1 shows the chemical compositions in terms of oxide contents as well as the loss on ignition LOI for the coal gangue The coal gangue has similar chemical compositions as the conventional clay used for
The hardness of Coal is 1 1 5 whereas its compressive strength is Not Available Streak is the color of rock when it is crushed or powdered The streak of Coal is black whereas its fracture is conchoidal Luster of Coal is the interaction of light with the surface of Coal Luster of Coal is dull to vitreous to submetallic Coal cleavage is non
Samples of coal gangue fired coal gangue and CFGM condensates on the external side of a gas vent were collected in order to fully characterize the chemical and mineralogical composition and to deduce the atmospheric emissions and the leaching potential of elements of major environmental concern Samples were collected from a terrace of a large coal gangue bank located 1 km to the south
The properties of coal gangue The main chemical compositions of coal gangue are SiO 2 Al 2 O 3 Fe 2 O 3 and CaO which occupies 58 24 7 and 5 wt respectively According to the basic
The hardness of Coal is 1 1 5 whereas its compressive strength is Not Available Streak is the color of rock when it is crushed or powdered The streak of Coal is black whereas its fracture is conchoidal Luster of Coal is the interaction of light with the surface of Coal Luster of Coal is dull to vitreous to submetallic Coal cleavage is non
Influence of soil cover on reducing the environmental impact of spontaneous coal combustion in coal waste gobs A review and new experimental data By Joan Grimalt Nanominerals and ultrafine particles from coal fires from Santa Catarina South Brazil
Notes 2 CHEMISTRY MODULE6 Occurrence and Extraction of Metals Chemistry of Elements z list and explain various methods for concentration of ores gravity separation magnetic separation froth floatation and chemical method z explain different metallurgical operations roasting calcination and smelting with suitable examples z choose the reducing agent for a given ore
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
1 Introduction Gangue minerals accounts for between 15 and 20 of raw coal in China Qian et al 2007 deed as coal production has increased so has gangue generation by the end of 2009 the total amount of gangue produced added up to 5 0 10 9 t encompassing 40 of the total Chinese solid waste Miao and Qian 2009 The accumulation of coal gangue not only takes up a
Spanish coal mining waste 2 3 The chemical composition of these coal wastes was as follows SiO 2 43 57 Al 2 O 3 17 21 Fe 2 O 3 5 8 The percentage variations reflect the source of the two coal wastes coal gangue waste and coal washing waste The other oxides were below 4 Its mineralogical phases were quartz and
Chemical Modification of Combusted Coal Gangue for U VI Adsorption T owards a W aste Control by Waste Strategy Yuan Gao 1 † Jiandong Huang 2 †
The concentration of heavy metal ions that precipitated from the coal gangue was used as the detection index and the distilled water with the initial pH value of 7 was used as the basic solution 6 1 Experimental Design of Static Immersion Leaching of Coal Gangue Chemical composition of coal gangue
A low cost mercapto modified coal gangue CG SH was fabricated by modification of coal gangue CG with 3 mercaptopropyl trimethoxysilane The structure and composition for as prepared CG SH were characterized by using X ray diffraction XRD Fourier transfer infrared spectroscopy FTIR scanning electron microscopy SEM and X ray fluorescence XRF
The accumulation/improper treatment of coal gangue will not only lead to waste of land but also cause environmental pollution Especially the impact of radioactive elements on the surrounding ecological environment is widely concerned by many scholars In this study the concentration of radioactive elements uranium U and thorium Th of small scale coal gangue mining site and surrounding
Coal gangue hills are prone to spontaneous combustion thereby polluting the environment of mining areas such as the soil groundwater and atmosphere and the frequent occurrence of gangue hill collapses landslides explosions and other accidents can even endanger the lives and property of residents To realize the safety management of coal gangue spontaneous combustion and evaluate its
The end of result of this project will be the determination of a detection chemistry suitable for a sensing technology for rapid field site identification of promising coal based REE resources and or for monitoring REE during processing Remaining technology challenges will include integration with a spectrometry system
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