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Study on Al2O3 extraction from activated coal gangue under ...

When the ratio of acid/coal gangue was 1.5 and reaction temperature was 650°C, the sulfuric acid leaching rate under air, air-hydrogen, carbon dioxide, hydrogen and nitrogen atmospheres were 93.66%, 90.90%, 84.06%, 81.91% and 77.54% respectively.

High Strength Glass-Ceramics Fabricated With Coal Gangue ...

coal ash, incinerator ash, and waste glass, and shell, oil shale ash and phosphorous fertilizer. Coal gangue as a type of industrial solid waste is widely used to produce cement [3], ceramics [4,5], refractory brick [6], zeolite [7], lightweight aggregate [8], and so on. A very large amount of the coal gangue is produced in coal production.

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Experimental study of the effects of stacking modes on the ...

Meanwhile, an infrared thermometer was adopted to measure the surface temperatures of the gangue piles. In this study, from the completion of the coal gangue models to the 60th day, the internal and surface temperatures of coal gangue stockpiles were measured at two-day intervals. Download high-res image (418KB) Download full-size image; Fig. 8. Schematic diagram of the temperature .

Combustion Properties of Coal Gangue Using ...

Field simulation test showed that after coal gangue was stacked for 60 d, the gangue temperature rose to 39.6°C. After covering the soil, the temperature data increased slowly.

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[Based on Curing Age of Calcined Coal Gangue Fine ...

When the calcination temperature reaches 700 degrees C, the activity of coal gangue fine aggregate is the highest. When calcining temperature continues to rise, activity falls. After 700 degrees C high temperature calcined coal gangue fine aggregate has obvious ash activity, the active components of SiO2 and Al2 O3 can be with cement hydration products in a certain degree of secondary hydration reaction.

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Investigation on Calcination Behaviors of Coal Gangue by ...

It deduced that kaolinite in coal gangue begins to decompose into amorphous meta-kaolinite at 450 °C and transforms to the crystallized mullite when the temperature reaches up to 1000 °C. The two thermal induced processes can be described by the following reactions [ 5, 28 ]:

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Experimental Study on Chloride Ion Penetration Resistance ...

In order to investigate the chloride ion penetration resistance of coal gangue concrete under -factor comprehensive action, the non-steady-state accelerated chloride ion migration test was used to test the chloride diffusion law of coal gangue concrete specimens by crack width, curing temperature and water-cement ratio. Three groups of crack width (0 mm, 0.05 - 0.12 mm, 0.12 - 0.2 mm ...

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Decomposition of key minerals in coal gangues during ...

The temperature range of mass loss of the dolomite-rich coal gangue in the second stage corresponded to that of the low-temperature ash in N-2 and O-2/N-2 atmospheres and the temperature range of mass losses in the second and third stages corresponded to that of the low-temperature .

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Thermal decomposition of selected coal gangue | SpringerLink

Sep 20, 2017 · The thermal behavior of two mineral-type coal gangues under different temperature conditions was investigated by heating treatment of kaolinite-type coal gangue and illite-type coal gangue based on thermal analysis, X-ray diffraction (XRD), infrared spectroscopy (IR) and scanning electron microscopy (SEM).

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Minerals | Free Full-Text | Investigation on Calcination ...

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 ...

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Experimental Study on Chloride Ion Penetration Resistance ...

The influence degree of three factors on chloride ion migration coefficient of gangue concrete is as follows: water cement ratio > crack width > curing temperature. Keywords: Coal Gangue Concrete, Chloride Ion Penetration, Water Cement Ratio, Crack Width, Curing Temperature. 1. Introduction

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Coal gangue is the by-product discharged in the process of coal mining and coal washing, which formed and coexisted with coal seam during the course of coal formation, containing some combustibles and abundant minerals. Long-term and continuous accumulation of coal gangue not only

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[Based on Curing Age of Calcined Coal Gangue Fine ...

When the calcination temperature reaches 700 degrees C, the activity of coal gangue fine aggregate is the highest. When calcining temperature continues to rise, activity falls. After 700 degrees C high temperature calcined coal gangue fine aggregate has obvious ash activity, the active components of SiO2 and Al2 O3 can be with cement hydration products in a certain degree of secondary hydration reaction.

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Effect of Curing Temperature on Mechanical Performance and ...

Request PDF on ResearchGate | Effect of Curing Temperature on Mechanical Performance and Acoustic Emission Properties of Cemented Coal Gangue-Fly Ash Backfill | Cemented coal gangue-fly ash ...

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Decomposition of key minerals in coal gangues during ...

The results showed that in both pyrolysis and O 2 /N 2 atmospheres, the mass loss of the kaolinite-rich coal gangue occurred in the temperature range of 300–600 °C in one single stage, but the mass loss of the dolomite-rich coal gangue occurred at 300–730 °C in two distinct stages.

  • Author: Yuanyuan Zhang, Yuanyuan Zhang, Zhezi Zhang, Mingming Zhu, Fangqin Cheng, Fangqin Cheng, Dongke Zhan...Get Price
Effect of Activated Coal Gangue in North China on the ...

Results show that the optimum thermal-activation temperature of coal gangue is 800°C: the coal gangues in Yangquan, Huozhou, and Xinzhi, China, had higher activity and the replacement level of coal gangue in the cement can reach 40% by weight, but the coal gangues in Yanzhou, Zhengzhou, and Qitaihe, China, showed lower activity.

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Study of the technology of heat pipe on prevention ...

The experimental results show that the HP can accelerate the heat release in coal gangue pile. The coal temperature could be controlled at 59.6 ˚ C with HP in 7 h and the highest cooling value is 39.4 % with HP in 150 h, which can effectively cool the temperatures of high temperature zones.

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Recycling of Moroccan coal gangue in the elaboration of a ...

We studied different mixtures composed of coal gangue and materials used in the manufacture of cement (limestone, raw). After various heat treatments, at temperatures up to 1450°C, the

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Microstructure of Coal Gangue and Precipitation of Heavy ...

The microstructure and mineral composition of the gangue play a decisive role in the precipitation of heavy metal elements. In this study, the microstructure, mineral composition, and precipitation of heavy metal elements of coal gangue with different weathering degrees were analyzed through electron microscopy, X-ray diffraction, and static immersion leaching experiments.

What Are The Physical Properties Of Coal Gangue

Distribution of polycyclic aromatic . · Five coal gangue samples from the Du'erping Coal Mine in Shanxi, China, subjected to low-temperature combustion, and their emitted gas samples were collected in situ at the combustion temperatures of 23°C, 33°C, 49°C, 57°C, and 70°C.

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