Investigation on the activation of coal gangue by a new compound method

Li, Chao; Wan, Jianhua; Sun, Hongjuan; Li, Longtu

doi:10.1016/j.jhazmat.2010.03.033

Cited by 171 publications

(57 citation statements)

References 15 publications

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“…Combustion of carbon/organic matter and dehydroxylation of kaolinite are two principal reactions in calcination process, after this process, performance indexes such as whiteness and activity of calcined products are significantly improved for industry applications [3,12,13]. The burnout level of carbon/organic matter of calcined products can be measured by the chemical oxygen demand (COD), and the activity of meta-kaolinite can be evaluated by leaching rate of aluminum from meta-kaolinite in hydrochloric acid solution [14][15][16][17][18].…”

Section: Methodsmentioning

confidence: 99%

Investigation on Calcination Behaviors of Coal Gangue by Fluidized Calcination in Comparison with Static Calcination

Yuan

Han

et al. 2017

Minerals

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Abstract:In order to comprehensively utilize coal gangue, we present fluidized calcination as a new thermal technology for activating coal gangue and systematical study was conducted in comparison with static calcination. The calcined products obtained by different calcination methods under various temperatures were characterized by the means of X-ray diffraction (XRD), thermal gravimetry-differential scanning calorimeter (TG-DSC), Fourier transform-infrared spectroscopy (FT-IR) and scanning electron microscope-energy dispersive spectrometer (SEM-EDS). Chemical and physical characteristics such as aluminium leaching rate, chemical oxygen demand and whiteness of calcined products were also investigated. The results show that aluminium leaching rate could reach to the maximal value 74.42% at 500 • C by fluidized calcination, while the maximal value of 66.33% could be reached at 600 • C by static calcination. Products by fluidized calcination obtained higher whiteness and lower chemical oxygen demand (COD) under the same calcination temperature. The well-crystallized kaolinite transform to amorphous meta-kaolinite under 600 • C and mullite presence under 1000 • C according to phase transformation, chemical bond variation and microstructure evolution analysis. Fluidized calcination was more efficiently for combustion of carbon/organic matter and dehydroxylation of kaolinite, which might applied in coal gangue industry in future.

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Section: Methodsmentioning

confidence: 99%

Investigation on Calcination Behaviors of Coal Gangue by Fluidized Calcination in Comparison with Static Calcination

Yuan

Han

et al. 2017

Minerals

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“…Coal gangue was used to make cementitious materials [24][25][26][27], but the highest utilization rate is just 52 % [27]. To consume coal gangue in large scale and to protect the cultivated land, Chinese Government recently encourages the brick-making enterprises to manufacture brick from coal gangue instead of clay.…”

Section: Introductionmentioning

confidence: 99%

Utilization of coal gangue for the production of brick

Song

Cao

et al. 2016

J Mater Cycles Waste Manag

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Coal gangue, an industrial solid waste discarded from coal mining and processing, was used as the sole raw material to prepare brick. 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 brick samples were characterized with X-ray diffraction, scanning electron microscopy, and physico-mechanical properties. Results indicate that bricks are composed of glassy phase, crystals of quartz, mullite, cordierite, as well as pores. The phase components, microstructure, and physico-mechanical properties of the bricks vary significantly with the sintering temperature. The linear shrinkage, bulk density, compressive strength, and flexural strength increase gradually with the sintering temperature enhancing from 900 to 1100°C, and rise sharply to the maximums at 1200°C, then drop considerably at 1250°C. The water absorption value exhibits an opposite tendency. Bricks meeting the Chinese Standard GB 5101-2003 were sintered at 1100-1250°C. The brick sintered at 1200°C possesses the optimal properties, with the water absorption and compressive strength values of 3.65 % and 45.61 MPa, respectively. The radioactivity index and leaching toxicity of sintered bricks prepared under the optimum condition were all below the corresponding standards.

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“…CG with its characteristic low volatile and high ash content is difficult to be on fire. [12][13][14][15] Circulated bed particles in circulating fluidized bed (CFB) furnace form a dense zone and keep at a high temperature. Therefore, CG can be ignited in time when in co-combustion with CBM in a CFB.…”

Section: Introductionmentioning

confidence: 99%

Co-utilization of two coal mine residues

Chen

Yang

et al. 2015

Advances in Mechanical Engineering

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In this study, the experiments were carried out in a circulating fluidized bed with different coal bed methane and coal gangue mixing ratios. The results show that bed temperature distribution becomes well-proportioned and the combustion efficiency increases when coal bed methane was introduced. The NO emission increases along with the excess air coefficient rise. The SO 2 emission reduces first and then increases with the rising bed temperature and there is an optimum temperature corresponding to the lowest SO 2 emission. At the same time, the effects of the bed temperature and excess air coefficient on pollutant emissions are more obvious when coal bed methane and coal gangue mixing ratio is less than 0.3. In the experiments, the best operation conditions have been found at coal bed methane and coal gangue mixing ratio of 0.2 and excess air coefficient of less than 1.3. The results show that the co-combustion of coal bed methane and coal gangue in circulating fluidized bed is feasible and provides some references for the combustion optimization.

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Investigation on the activation of coal gangue by a new compound method

Cited by 171 publications

References 15 publications

Investigation on Calcination Behaviors of Coal Gangue by Fluidized Calcination in Comparison with Static Calcination

Investigation on Calcination Behaviors of Coal Gangue by Fluidized Calcination in Comparison with Static Calcination

Utilization of coal gangue for the production of brick

Co-utilization of two coal mine residues

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