A New Comprehensive Utilization Method for Coal Gangue: Preparing Alite-Sulphoaluminate Cement

Xu, Guan Li; Sun, Chuan Min; Sun, Yao; Hai, Liao

doi:10.4028/www.scientific.net/amr.652-654.1527

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…Tie et al [6][7][8] studied waste heat recovery from gangue brick tunnel kilns to improve the efficiency of waste heat utilization. Xu et al [9] used the coal gangue with high-alumina content as an alumina constituent for the preparation of sulphoaluminate cement. Wang et al [10] proposed a backfilling technology with gangue to remove the potential damage caused by gangue hillock.…”

Section: Introductionmentioning

confidence: 99%

Impact-Crush Separation Characteristics of Coal and Gangue

Yang

Zheng

et al. 2016

International Journal of Coal Preparation and Utilization

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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 method. The equation of the impact-crush separation characteristics of coal and gangue was obtained by means of a regression analysis of the experiment results. The results indicated that the crush-ratio difference of coal and gangue had a linear relationship with the hardness and impact velocity of coal and gangue. It decreased with an increase of coal hardness and increased with an increase of gangue hardness. 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. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Impact-Crush Separation Characteristics of Coal and Gangue

Yang

Zheng

et al. 2016

International Journal of Coal Preparation and Utilization

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“…Finally, an excellent method for sintering glass ceramics was developed, characterized by high strength, light weight, and low water absorption. Xu [9] used crushed gangue, limestone, and gypsum as the main materials and fluorite and barite as the secondary materials and prepared an alite-sulfoaluminate cement at 1330 • C. The results showed that the compressive strength of the cement after 7 days was 48.9 MPa. Wang [10] prepared a new biochar composite material using crushed coal gangue as a raw material in a one-step pyrolysis method.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Particle Size Alteration and the Selective Crushing Phenomenon of Gangue during the Jaw Crushing Process

Zhu

Song

et al. 2022

Sustainability

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This study examines the particle size and distribution of the main chemical components of gangue during the crushing process. Coal mine gangue was chosen as the research object, and its particle size and chemical components at various crusher discharge settings were examined through screening, grinding, chemical composition testing, and other methods. The findings demonstrate that the characteristic particle size in the gangue particle size distribution model has a logarithmic upward trend as the width of the discharge port increases. In contrast, the uniformity index has shown an exponential downward trend. The analysis of the distribution rate and enrichment ratio of the main chemical components of the gangue at different widths of the discharge port shows that the gangue exhibits obvious selective crushing during the crushing process. The distribution rate of each component is affected by the size of the screen aperture to various extents. As the discharge port width increases, the elements of CaO and MgO are enriched in the coarse-grained products, while those containing Fe2O3 are enriched from fine-grained to coarse-grained. Gangue particles containing Al2O3, SiO2, and C are enriched in the fine-grained product. In addition, by analyzing the alterations in the main chemical components of gangue at different particle size intervals, it was found that the amount of each component first rises and then falls, and the trend of enrichment ratio to particle size follows an exponential pattern. The research results have significance for guiding the selection of resource utilization methods of gangue with different particle sizes after crushing.

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“…The research mainly included power generation from coal gangue, chemical products manufacturing, building materials manufacturing and goaf backfilling. [12][13][14][15]. The most economical and effective method to backfill the goaf is to use the coal gangues directly, which could not only solve the problem of gangue surface discharge but also reduce upgrade costs of coal gangues.…”

Section: Introductionmentioning

confidence: 99%

Overview of Solid Backfilling Technology Based on Coal-Waste Underground Separation in China

Zhang¹,

Zhang²,

Wu³

et al. 2019

Sustainability

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China is the world’s largest coal producer country. However, large-scale coal mining has led to severe environmental pollution issues such as surface subsidence and gangue piling up. The gangue discharging amount has ranked the first in the world and coal mine enterprises are facing enormous discharging reduction pressure. This paper summarizes the research progress of the solid backfilling mining technology and then illustrates the realistic demands and significance of implementing underground coal-waste separation. It also focuses on the technical principles, systems and key equipment of the common underground coal-waste separation methods, such as the selective crushing method, the dense medium shallow groove method, the vibro-assisted jigging method and full-size water separation method and ray identification method. In addition, the selection steps of underground coal-waste separation method, the design process of large section separation chamber and the design principle of separation and backfilling system are proposed, finally, the mining-separating-backfilling + X for coal mining is put forward. By combining the technology of mining-separating-backfilling with other technologies, such as gob-side entry retaining with non-pillar mining, gas extraction, solid waste treatment, water protection mining, mining under buildings, railways and water bodies, the integrated mining methods, mining-separating-backfilling + setting pillars, gas drainage, treatment, protection and prevention methods are formed. It also introduced the ‘mining-separating-backfilling + gas extraction’ technology’s whole idea, system arrangement, separation equipment and practical engineering application effects based on the specific engineering case of pingmei no. 12 coal mine. The results indicate that the integration of underground coal-waste separation and solid backfilling technology could achieve gangue discharging reduction, underground washing and surface subsidence control. It is effective at realizing green mining.

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A New Comprehensive Utilization Method for Coal Gangue: Preparing Alite-Sulphoaluminate Cement

Cited by 4 publications

References 3 publications

Impact-Crush Separation Characteristics of Coal and Gangue

Impact-Crush Separation Characteristics of Coal and Gangue

Experimental Investigation of Particle Size Alteration and the Selective Crushing Phenomenon of Gangue during the Jaw Crushing Process

Overview of Solid Backfilling Technology Based on Coal-Waste Underground Separation in China

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