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  • Preparation and characterization of glass–ceramic foams

     · Coal gangue is a complex industrial solid waste which mainly contains carbonaceous shale sandstone shale and conglomerate with SiO 2 and Al 2 O 3 as major chemical constituents . According to statistic 2 the accumulative reserve of coal gangue has reached 3.8 billion tonnes and a further 200 million tonnes is produced annually in China.

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  • Comparison of red mud and coal gangue blended

     · Coal gangue is a solid waste discharged during coal mining and washing the pozzolanic reactivity of which can be improve under appropriate activated method . The main mineral phases of kaolinite-based coal gangue is kaolinite. At present research on geopolymer directly manufactured from coal gangue is extremely scarce.

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  • Synthesis of Ultrafine Silica Powder Using the Silica

     · (2015). Synthesis of Ultrafine Silica Powder Using the Silica Source Alkali-Leached from Coal Gangue. Integrated Ferroelectrics Vol. 161 Proceedings of The Thirteenth China International Nanoscience and Technology Symposium (CINSTS14) Part II of V pp. 10-17.

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  • How to Turn the Coal Gangue Into a TreasureHongxing

     · Strictly speaking coal gangue is a mineral with very low carbon content. It is a kind of solid waste produced during coal mining and washing process. The color of coal gangue is black and gray. It is a little hard so when handling it we should choose the superior processing equipment.

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  • Effect of Ammonium Salt on the Adsorption Behavior and

     · bituminous coal and silica. As the goal minerals in coal reverse flotation are gangue minerals like silica kaolinite etc. excessive dextrin might deteriorate the collection of gangue minerals. Even with the addition of dextrin the adsorption quantity of ammonium salt on sub-bituminous coal is still always higher than that on silica. 2.2.5.

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  • Study on The Preparation Technology of Poly-Silicate

    Si Al Fe were leached from coal gangue to prepare Poly-silicate-aluminum-ferric (PSiAF) coagulant. The optimal technology of preparation of PSiAF was explored through single factor experiment and orthogonal experiment. The effect factor of preparation such as the content of silica the molar ratio of Al to Fe (n Al n Fe ) the molar ratio of metal (Al Fe) to Si (nAl Fe nChat Online

  • Separation of aluminum and silica from coal gangue by

     · The results of the proximate analysis of coal gangue and the ash composition are listed in Table 1.The amounts of SiO 2 Al 2 O 3 and Fe 2 O 3 account for 52.44 43.64 and 2.74 in the ash of coal gangue. Moreover other impurities such as TiO 2 MgO and CaO are also observed in small quantities.The sum of the percentages of SiO 2 and Al 2 O 3 accounts for 96.08 of the total ash

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  • High Strength Glass-Ceramics Sintered With Coal Gangue

     · fertilizer. Coal gangue as a type of industrial solid waste is widely utilized to produce cement 11-13 ceramics 14-16 refractory 17 zeolite 18 lightweight aggregate 19 mullite 20 and so on. A very large amount of the coal gangue is produced by coal production.

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  • Structure of Coal Gangue after Aqueous Solution

     · The coal gangue (CG) samples used in this study were collected from the Jinyang Coal Mine in Ordos China (Figure1). The coal gangue was first broken by a crusher and then filtered by a classifying screen to obtain a group of samples with a particle size of 9.5–16 mm. The basic physical and mechanical parameters

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  • Investigation on the Activity Activation and Cementitious

    The cementitious property of coal gangue was measured by strength test.The results showed that thermal activation decomposed kaolinite in coal gangue and formed the metastable structure with a porous state multiple internal broken bonds and large specific surface areas.

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  • PROCESSING LOW RANK COAL AND ULTRA-FINE

     · bituminous and brown coal also referred as low rank coal (LRC). With the impending energy crisis it will be increasingly necessary to use LRCs. Although low rank coal has low ash and sulfur contents its high moisture content low calorific values and spontaneously combusting characteristics makes

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  • Integrated green mining technology of "coal mining-gangue

    The integrated coal mining in seams 5 8 and 9 of Tangshan Mine showed that the four backfilling surfaces of T3281 T3292 F5001 and F5002 recovered 946 000 t of raw coal and 1.18 million tons of filled gangue with a net profit of 363.20 million yuan.

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  • IOP Conference Series Earth and Environmental Science

    Zn(II) Cd(II) and Pb(II) of coal gangue at bismuth film glassy carbon electrodes Xiu-Teng Wang Yajing Zhang Xiaoyan Li et al.-Investigation on the Activity Activation and Cementitious Property of Coal Gangue with High Iron and Silica Contents Hong Wu Yu Li Min Teng et al.-This content was downloaded from IP address 207.46.13.60 on 04/05

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  • Properties and pore-forming mechanism of silica sand

    The best composition formula is silica sand tailing 55 wt -steel slag 20 wt -coal gangue 25 wt (water permeability 4.68 10 −2 cm/s compressive strength 42.83 MPa bending strength 6.87 MPa) with sintering temperature increasing the permeable ceramic structure becomes porous the optimum sintering temperature range is 1150 °C–1170

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  • Utilization of coal gangue for the production of

     · Coal gangue an industrial solid waste discarded from coal mining and processing was used as the sole raw material to prepare . The coal gangue was crushed homogenized milled and then pressed into green compacts. The dried compacts were sintered at different temperatures for 2 h. The obtained samples were characterized with X-ray diffraction scanning electron microscopy and

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  • Extraction of SiO2 and Al2O3 from coal gangue activated by

    Abstract In this work a novel method is introduced to activate coal gangue (CG) for extraction of Si and Al species. The activation experiments were carried out using a stainless steel tube reactor (17 mL) and an autoclave reactor (1000 mL). Firstly CG was activated by supercritical water added with alkali. It was found that the kaolinite phase of raw CG could be transformed into cancrinite

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  • SilicaKetchen Land

    SILICA. Ketchen Land Company owns a 2 000 acre tract in eastern Tennessee containing reserves of between 75-150 million tons of high-grade silica sandstone. The high silica content and low level of contaminants make this sand suitable for multiple uses including the production of glass fracking sand and ground silica .

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  • (PDF) Influence of different sources of coal gangue used

     · Influence of different sources of coal gangue used as aluminosilicate powder on the mechanical properties and microstructure of alkali-activated cement September 2019 Materiales de Construcción

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  • FDOFLQLQJFRDO JDQJXHIOPscience

     · 1 / 12 Reaction Mechanism of metakaolin materials prepared by calcining coal gangue Shaowu Jiua Simeng Chenga Hui Lia b Lei Wanga a College of Materials Science and Engineering Xi an University of Architecture and Technology Xi an 710055 b Shaanxi Ecological Cement Concrete Engineering Technology Center Xi an 710055 Abstract Metakaolin-based auxiliary cementitious materials

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  • Investigation on the Activity Activation and Cementitious

    The activity of coal gangue by thermal activation and composite activation technologies was investigated. The crystal composition framework structure and morphology change were analyzed by XRD FT-IR and SEM respectively. The cementitious property of coal gangue was measured by strength test. The results showed that thermal activation decomposed kaolinite in coal gangue and formed the

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  • Potentially useful elements (Al Fe Ga Ge U) in coal

     · Indeed coal gangue also as a kind of valuable resource is a mixture of carbon-containing rocks and other sedimentary rocks such as shale carbonaceous shale sandy shale and sandstone (Gu 1997).Major elements dioxides in coal gangue usually include SiO 2 Al 2 O 3 Fe 2 O 3 CaO MgO Na 2 O K 2 O etc. and it also contains other trace elements (Zuo 2009).

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  • Journal of Cleaner ProductionNSF

    Coal EtOH-SCC extraction residual Sandstone purity of b-SiC produced by coal gangue with carbon reached 76.01 (Xiao et al. 2015). Also b-SiC synthesized with silica fume and brown coal semi-coke shows a purity of 90e91 (Anikin et al. 2016). On the other hand the C concentration in the C-rich mate-

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  • FDOFLQLQJFRDO JDQJXHIOPscience

     · 1 / 12 Reaction Mechanism of metakaolin materials prepared by calcining coal gangue Shaowu Jiua Simeng Chenga Hui Lia b Lei Wanga a College of Materials Science and Engineering Xi an University of Architecture and Technology Xi an 710055 b Shaanxi Ecological Cement Concrete Engineering Technology Center Xi an 710055 Abstract Metakaolin-based auxiliary cementitious

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  • Glass-ceramics fabricated by efficiently utilizing coal

     · produced in coal production. Its amount produced in China is reached above several million tones and increases to about one million tones per year. Currently the rate of using coal gangue is very limited. E fficiently utilizing the coal gangue is an urgent assignment to

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  • Utilization of coal gangue for the production of

     · Coal gangue an industrial solid waste discarded from coal mining and processing was used as the sole raw material to prepare . The coal gangue was crushed homogenized milled and then pressed into green compacts. The dried compacts were sintered at different temperatures for 2 h. The obtained samples were characterized with X-ray diffraction scanning electron microscopy and

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  • Integrated green mining technology of "coal mining

    The integrated coal mining in seams 5 8 and 9 of Tangshan Mine showed that the four backfilling surfaces of T3281 T3292 F5001 and F5002 recovered 946 000 t of raw coal and 1.18 million tons of filled gangue with a net profit of 363.20 million yuan.

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  • EFFECTS OF COAL GANGUE ON THE SULFATE ATTACK

     · Eects of coal gangue on the sulfate attack resistance of cement-based materials CeramicsSilikáty 65 (2) (2021) 149 reactivity of coal gangue after calcination. Research by Song et al 19 showed that calcined coal gangue at 700 °C has an improved activity. It was also shown in 20 that the activity of coal gangue could be enhanced

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  • Feasibility study on the application of coal gangue as

    Coal gangue is a kind of black gray rock with lower carbon content and harder than coal in the process of coal formation which is produced in the process of tunneling mining and coal washing 19 .

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  • Preparation and characterization of glass–ceramic foams

     · Coal gangue is a complex industrial solid waste which mainly contains carbonaceous shale sandstone shale and conglomerate with SiO 2 and Al 2 O 3 as major chemical constituents . According to statistic 2 the accumulative reserve of coal gangue has reached 3.8 billion tonnes and a further 200 million tonnes is produced annually in China.

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  • Influence of different sources of coal gangue used as

    largest coal producers (1). Coal is composed of hydrocarbons derived from the decomposition of organic matter over millions of years. The mineral is interspersed with layers of rocks of different types including sandstone shale and siltstone (2). The coal washing process results in coal gangue a solid

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  • Radiation characteristics of natural gamma-ray from coal

     · Recognition of coal and gangue (roof rock) is a key technology to realize fully mechanized top coal caving automated mining. This paper proposes to detect the instantaneous refuse content of

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  • Radiation characteristics of natural gamma-ray from coal

     · Recognition of coal and gangue (roof rock) is a key technology to realize fully mechanized top coal caving automated mining. This paper proposes to detect the instantaneous refuse content of drawn

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  • TheEffectofAcidMineDrainageCorrosionontheCreep

     · Table 2 Mineralogical composition of coal gangue. Minerals Proportion ( ) Siltite 8.5 Medium-grained sandstone 42.7 Fine-grained sandstone 13.6 Sandy mudstone 19.5 Coal 2.1 Carbonaceous mudstone 4.7 Arenaceous shale 3.0 Table 3 Main parameters of coal gangue. Parameters Value Mt 0.5 Mad 0.21 Aad 88.12 Vad 76.64 Fixed carbon 2.78 Total

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  • Fractal characteristics of crushed particles of coal

     · The fractal dimensions of crushed sandstone and sandy mudstone under compaction are calculated. The fractal dimension of each crushed specimen ranges from 0.352 to 2.654 with increase of stress. The fractal dimension increases with increased content of small particles and tends to

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  • PROCESSING LOW RANK COAL AND ULTRA-FINE

     · bituminous and brown coal also referred as low rank coal (LRC). With the impending energy crisis it will be increasingly necessary to use LRCs. Although low rank coal has low ash and sulfur contents its high moisture content low calorific values and spontaneously combusting characteristics makes it really difficult to utilize.

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  • The Characteristics of Roof Breaking and the Law of Ground

     · The "rock-gangue" structure refers to the semi-arch structure formed by extruding no caved rock and caved gangue. This structure form is the most common structure form in top coal caving stope especially when the upper direct roof is sandstone with larger thickness and higher strength the collapse of which is easy to form bulk gangue while the mutual extrusion of bulk gangue is easy to form

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  • Data of GeochemistryUSGS

     · Both shale and sandstone show wide fluctuations in content of silica lime and carbon dixoxide owing to biochemical admixtures of silica and calcium carbonate and for the sandstones owing also to introduction of such materials as intergranular cement. EVALUATION AND SELECTION OP

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  • Effects of chemistry and mineral on structural evolution

    The Essential Properties of Raw Gangue

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  • PROCESSING LOW RANK COAL AND ULTRA-FINE

     · bituminous and brown coal also referred as low rank coal (LRC). With the impending energy crisis it will be increasingly necessary to use LRCs. Although low rank coal has low ash and sulfur contents its high moisture content low calorific values and spontaneously combusting characteristics makes

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  • Structure of Coal Gangue after Aqueous Solution Treatment

     · The coal gangue (CG) samples used in this study were collected from the Jinyang Coal Mine in Ordos China (Figure1). The coal gangue was first broken by a crusher and then filtered by a classifying screen to obtain a group of samples with a particle size of 9.5–16 mm. The basic physical and mechanical parameters

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  • Dynamic random arching in the flow field of top-coal

     · Field practice shows that the arching of coal/gangue and the drawing out of gangue are peculiar mudstone and silica. It is overlain by silt sandstone fine sandstone and coarse sandstone with 22.93 m in thickness. The advance web of the working cycle is 0.8 m and the top-coal caving interval is 0.8 m.

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  • ExperimentalStudyonPropertiesofRock-CementedCoal

     · the coal gangue particle size which are consistent with the effects of the coal gangue particle size onthat of pure CGFB samples 20 . 3.2. Failure Characteristics of Composite Samples. Typical images of macrofailure for the coarse sandstone-CGFB composite samples with different coal gangue particle sizes are shown in Figure 7.

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