Control Effects of Five Common Solid Waste Backfilling Materials on In Situ Strata of Gob

Huang, Peng; Spearing, Sam; Feng, Jie; Jessu, Kashi Vishwanath; Wang, Zhongwei; Ning, Pai

doi:10.3390/en12010154

Cited by 18 publications

(9 citation statements)

References 11 publications

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“…Coal gangue are mainly reused as supplementary materials in backfilling technology, building construction, energy fuel, soil improvement, water purification, special cementitious materials, etc. [6][7][8]. Geopolymer is a kind of environmentally friendly mineral polymer material, which has an excellent cementitious property and is a hot topic in the field of industrial solid waste recycling.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Characteristics of Activated Coal Gangue and Coal Gangue-Based Geopolymer

et al. 2020

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Coal gangue-based geopolymer (CGGP) is one of the hot spots existing in the recycling of coal gangue resources due to its good comprehensive mechanical properties. However, the coal gangue structure is stable and reactivity is poor, so the coal gangue needs to be activated before utilization. In this paper, the microstructure changes of activated coal gangue by different mechanical and thermal activation methods, as well as the mechanical properties and microstructure changes of the CGGP specimens were studied by experimental investigation. The results indicated that mechanical activation and thermal activation were two effective methods to change the reactivity of coal gangue, which consisted of destroying the stable kaolinite structure and improving the activity of coal gangue. Conversely, part of the amorphous structure in coal gangue was destroyed when the activation temperature reached 900 °C, which was not conducive to the further enhancement of coal gangue activity. For the CGGP prepared by thermally activated coal gangue and modified sodium silicate alkali solution, the uniaxial compressive strength of the CGGP specimens decreased with thermal activation temperatures of the raw coal gangue materials at 700 °C, 800 °C, and 900 °C. The main reason for this was the lower amount of the active metakaolin structure in coal gangue at 900 °C, which was not conducive to the geopolymerization process.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Characteristics of Activated Coal Gangue and Coal Gangue-Based Geopolymer

et al. 2020

Self Cite

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“…This issue also applies to the mining industry of solid, liquid and gaseous minerals, which is expected to intensify production while minimizing negative impacts on the environment [4][5][6]. This determines the conduct of research and the search for new solutions-both in terms of improving the reliability of machines [7][8][9][10] and optimizing production processes [11][12][13][14][15][16][17] as well as improving work safety [18][19][20][21][22] and caring for the environment [23].…”

Section: Introductionmentioning

confidence: 99%

“…Energies 2022, 15, x FOR PEER REVIEW 2 of 15 well as improving work safety [18][19][20][21][22] and caring for the environment [23]. Sustainable development is also observed in hard-coal mining, which deals with the intensification of the mining process and an increase in efficiency.…”

Section: Introductionmentioning

confidence: 99%

Development of a Hydraulic System for the Automatic Expansion of Powered Roof Support

Szurgacz

Borska²,

Diederichs³

et al. 2022

Energies

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A mechanical support in a longwall complex requires proper supervision and control of operating parameters because it is responsible for the safety of machines and workers. Its main functions are to protect the excavation against the adverse effects of rock mass and to move it along with the operational progress of the shearer and the scraper conveyor. In the era of Industry 4.0 as well as green economy and sustainable development, the development of machines and devices included in the longwall complex is an important area of invention. When it comes to the mechanical support included in the longwall complex, the authors propose changes to the hydraulic control system. The main purpose of the work was to develop a system that can automatically expand the legs of the powered support. Tests were carried out under real conditions while equipping the support section with a prototypical hydraulic system and with a system monitoring the correct operation of the prototype. This article presents the development of a prototypical installation under real conditions for testing on a longwall. The innovative solution proposed by the authors consisted of introducing a prototypical double valve block into the hydraulic system of the housing, which enables the function of automatic section expansion. The authors proposed a solution aimed at shortening the work time of the powered-support-section operator. The research results made it possible to evaluate the usefulness of the proposed solution. This type of solution can be considered technical support in the process of coal mining in an underground mine. Analysis presented in this paper, along with results from research conducted and its conclusions, can be of practical help to enclosure users to improve reliability and achieve optimal performance.

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“…At this stage, it is also worth taking into account the working environment of the designed machines [20][21][22]. Numerical tests of powered support sections conducted by using the finite element method in the design process shorten the time of creating a prototype [23][24][25]. They enable the use of various design variants [26,27] in order to choose the most optimal solution based on the analysis [28,29].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study for Determining the Strength Limits of a Powered Longwall Support

Szurgacz

Trzop²,

Gil³

et al. 2022

Processes

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The process of designing a longwall powered support is extremely complex and requires many operations related to the creation of a complete machine. The powered support section is one of the basic elements of the longwall system. It acts as protection for the working space and takes part in the process of excavating and transporting the spoil. The implementation of the support that meets the guidelines of the manufacturer and user requires an endurance analysis at the design stage conducted according to the regulations in force. The main objective of this research, pursued by the authors, was to perform the analysis of the ultimate strength of selected elements of the designed powered support section. The research was carried out with the use of special software that uses the finite element method. This article presents the analysis of the strength limits conducted with the help of the finite element method, determining the strength of selected elements of the longwall support section. The solutions proposed by the authors include changes in the structure and properties of the material in the design process. The aim of the proposed solution was to obtain a model with strength value that meets safety standards. The research results are a valuable source of knowledge for designers. Solutions of this type set examples for spatial models of the longwall support section being designed currently. The analysis presented in the article, together with the results of the research and the conclusions resulting from them, may improve the safety and effectiveness of powered supports.

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Control Effects of Five Common Solid Waste Backfilling Materials on In Situ Strata of Gob

Cited by 18 publications

References 11 publications

Experimental Study on the Characteristics of Activated Coal Gangue and Coal Gangue-Based Geopolymer

Experimental Study on the Characteristics of Activated Coal Gangue and Coal Gangue-Based Geopolymer

Development of a Hydraulic System for the Automatic Expansion of Powered Roof Support

Numerical Study for Determining the Strength Limits of a Powered Longwall Support

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