Based on the source and distribution of coal gangue (CG) in China, this study introduces the current situation of CG storage in China and the problems existing in the …
The impacting crusher was used to impact crushing test on coal and gangue from three mining with different impact velocity.The distribution function of coal and gangue,the influence of the impact velocity and the hardness of coal and gangue on the distribution function were got from the data fitting of experimental results.The results show …
Introduction. With the long-term sustained development of coal resources, the continuous underground coal mining activities have caused surface subsidence and accumulation of coal gangue waste, which has seriously affected coal mining and caused serious pollution to the living environment in mining areas 1 – 4.Fill mining, as a green …
Wrapped coal gangue aggregate enhancement ITZ and mechanical property of concrete suitable for large-scale industrial use. ... Vickers hardness, and microstructure of modified coal gangue aggregate concrete (CGAC) were studied, and the relationship between modified CGA properties and CGAC properties was also analyzed. The results …
In the field of civil engineering, coal gangue could be used as aggregates to make concrete blocks [3], [4], bricks [5], lightweight concrete [6] and other low value-added building materials. However, the low hardness and high porosity of coal gangue aggregate lead to its high water absorption and low strength [7].
Given the differences of hardness between coal and gangue, after selective crushing, the gangue with the higher hardness was crushed less and coal with lower hardness crushed more, which could be ...
The results suggested that coal gangue significantly influences soil S, pH and plant species after 8 years of natural recovery. The CK-far plots contained relatively …
Vickers hardness of coal gangue increased from 0.29 GPa to 6.37–6.79 GPa, and the fracture toughness increased significantly to 41.9–67.6 MPa m 1/2. Under K …
Given the differences of hardness between coal and gangue, after selective crushing, the gangue with the higher hardness was crushed less and coal with lower hardness crushed more, which could be separated by a 50 mm sieving plate. The material above the sieving plate was disposed of as gangue and the material below as coal.
Coal gangue is the main solid waste produced in coal mining and preparation, ... The HVS-1000 digital intelligent microhardness tester, which has a digital display resolution of 0.03. μm, a hardness scale of HV0.1, and a load of 0.98 N, was used in the test. The indenter was pressed into the surface of the sample and then unloaded ...
Furthermore, the coal gangue has low purity, low density (often 1.0–2.5 g/cm 3), and a certain expansion, plasticity, contraction, as well as high hardness and strength, making the coal gangue fire-resistant, acid-resistant, and having a low ion exchange capacity [26]. According to the mentioned qualities, coal gangue can serve as refractory ...
Coal Gangue Pulverizer Raymond Mill Finished product fineness: 80-325 mesh Production capacity: 1.5-100t/h It is suitable for the processing of more than 300 kinds of high-fine powder materials in non-flammable and explosive mineral, chemical, construction and other industries with Mohs hardness not greater than 7 and humidity …
The crushing rates of coal and gangue were chosen as investigation target, and a comprehensive analysis was made for the coal gangue hardness relative difference value, crushing velocity, and crush frequency. According to the theory of selective crushing of coal and gangue, an impact crusher was used in crushing.
Table 5 Separation effect of coal and gangue Mine Coal Gangue Relative difference of hardness (%) Difference of crush ratio (%) Liangzhuang 1.14 3.27 1.868 49.92 Daliu 1.54 3.82 1.481 32.52 Jiahe 2.65 6.57 1.479 12.68 Table 5 shows that an effective separation (as in the Liangzhuang Mine) can be achieved so long as the …
Coal gangue (CG) is a type of industrial solid waste produced by the process of coal excavation and separation 1, 2, 3. Generally, one ton of CG is discarded …
According to incomplete statistics, the amount of coal mining under buildings, railways, and water-bodies of production mines is up to 1.43 × 10 10 t [1] and the cumulative amount of gangue piled ...
Synergy of 10 % fly ash-cement slurry encapsulation and CO 2 mineralization improved the mechanical properties of coal gangue.. CO 2 mineralization enhanced the interfacial transition zone (ITZ) between the slurry and coal gangue.. The modulus of elasticity of gangue aggregate increased by an average of 12.73% and the …
1.2. Source and distribution of CG in China. CG is a kind of black gray shale rock produced in the process of coal production. China is the world's largest coal producer (Munir et al., 2020) and also the largest coal consumer.Coal provides about 62% of China's energy demand (Mita et al., 2015).In the process of sorting and processing, the production of …
Moreover, it can be found that the existence of BFA decreases the porosity near ITZ of SCFB samples with a low w/c ratio; on the contrary, the porosity near ITZ of SCFB samples with a high w/c ...
Coal hardness had a remarkable influence on the crush-ratio difference of coal and gangue; the gangue hardness and the impact velocity had the least effect. View. Show abstract ...
Vickers hardness of coal gangue increased from 0.29 GPa to 6.37-6.79 GPa, and the fracture toughness increased significantly to 41.9-67.6 MPa m 1/2. Under K …
With the increase of coal gangue powder, the hardness of coal gangue/Al cermet gradually increases, while the static compression strength first increases and then decreases. When the mass fraction of gangue is 25wt%, the coal gangue/Al cermet material has the best performance. Density is 2.23g/cm3, hardness is 752HV,
of coal gangue with dierent particle sizes under conned compression conditions are studied by obtaining the ... the research found that the greater the hardness of the gangue lling material, the ...
Coal gangue has a certain hardness ; however, it needs to be crushed to use as aggregate because of its large size. Figure 5 shows the breaking process for coal gangue with a counterattack crusher. The gangue materials are piled up around the crawler and transmitted to the counterattack crusher through the crawler.
Coal gangue has a certain hardness [20]; however, it needs to be crushed to use as. aggregate because of its large size. Figure 5 shows the breaking process for coal gangue. with a counterattack ...
and coal gangue leachate near a coal mine gangue pile in Handan revealed the presence of chromium, manganese, copper, zinc, lead, and cadmium in both. The gangue leachate was conclusively shown to impact surface water quality (Zhang et al., 2014). In the coal gangue of Yangquan mine, Shanxi Prov-ince, chlorine was identied primarily in the form
2.3.1 1D-CNN. Considering that the data collected by the multispectral equipment selected in this study are simple, the extracted spectral information contains the average spectral intensity of 25 wavelength positions, that is, the input dimension of the 1D-CNN model for identifying coal and gangue constructed in this study is 25.
ABSTRACT. Utilizing the difference in hardness, coal and gangue can be separated by the impact-crush technology for utilization underground. The influence of hardness and impact velocity on the crush-ratio difference of coal and gangue was studied using an impact-crush separator and was optimized using the orthogonal experiment …
Introduction of Coal Gangue. ... slag and other material whose Moh's hardness is less than 9.3. This machine is suitable for mining, metallurgy, chemical engineering, building material and many industries material fine powder making, final product size is adjustable. The gangue grinder is constituted by separator, rollers, grinding table ...
Gangue is the concomitant product of coal mining. The traditional approach for gangue treatment is to transport it from underground to ground level to accumulate and form gangue hills. On the basis of summarizing previous research results, this paper introduces the hydraulic roller crusher and the electric machine built-in coal gangue …
