2022-06-08
Abstract：
With the continuous high-intensity development of coal mine in China, mining conditions have gradually deteriorated, and traditional mining methods have brought about a series of resources, safety and environmental problems. Based on the ideas of “low damage of rock strata”, “mining without coal pillars” and “zero solid waste discharge”, the scientific conception of “short-wall filling & long-wall mining” and its technical principle to replace the section coal pillars with solid waste filling belt formed by nearby sorted gangue in underground coal mining area are put forward. Key technologies of“picking-selecting-filling-retaining”have been explored to deal with the problem of the resources waste of remaining coal pillars, environmental pollution caused by solid waste discharge, and technical bottlenecks of traditional mining and safety risk of deep mining as a whole. The theory of slow energy release and the theory of low damage rock control on solid waste filling belt are put forward. Five key technologies are described: “short-wall filling and long-wall mining" system design method, underground intelligent dry-weight light-weight modular sorting system, self-contained and high-efficiency mining technology and equipment,technology and equipment for retaining roadway along filling belt, and the integrated control technology of “short-wall filling & long-wall mining” system.The field application results show that the “small-charge long mining” scientific mining model has a underground gangue direct filling capacity of 2 million t/a and 1 million t/a in the Hulusu Coal Mine and Liuzhuang Coal Mine respectively, and the coal mining is solved by the limited solid waste resource integration. The resources, safety and environmental protection issues can achieve no coal-pillar mining in underground and zero solid waste on the ground. This model has innovated new theories, new technologies and new methods of green mining, and constructed a scientific mining system for new green mining in China.
With the continuous high-intensity development of coal mine in China, mining conditions have gradually deteriorated, and traditional mining methods have brought about a series of resources, safety and environmental problems. Based on the ideas of “low damage of rock strata”, “mining without coal pillars” and “zero solid waste discharge”, the scientific conception of “short-wall filling & long-wall mining” and its technical principle to replace the section coal pillars with solid waste filling belt formed by nearby sorted gangue in underground coal mining area are put forward. Key technologies of“picking-selecting-filling-retaining”have been explored to deal with the problem of the resources waste of remaining coal pillars, environmental pollution caused by solid waste discharge, and technical bottlenecks of traditional mining and safety risk of deep mining as a whole. The theory of slow energy release and the theory of low damage rock control on solid waste filling belt are put forward. Five key technologies are described: “short-wall filling and long-wall mining" system design method, underground intelligent dry-weight light-weight modular sorting system, self-contained and high-efficiency mining technology and equipment,technology and equipment for retaining roadway along filling belt, and the integrated control technology of “short-wall filling & long-wall mining” system.The field application results show that the “small-charge long mining” scientific mining model has a underground gangue direct filling capacity of 2 million t/a and 1 million t/a in the Hulusu Coal Mine and Liuzhuang Coal Mine respectively, and the coal mining is solved by the limited solid waste resource integration. The resources, safety and environmental protection issues can achieve no coal-pillar mining in underground and zero solid waste on the ground. This model has innovated new theories, new technologies and new methods of green mining, and constructed a scientific mining system for new green mining in China.
2020, 48(9): 117-122.
Abstract：
The coal gangue cemented backfill slurry has high quality concentration.If the pipeline layout and transportation parameters are unreasonable,non-full pipeline flow and pipeline transportation failures are likely to occur during the backfilling process.In order to clarify the causes and hazards of non-full pipeline flow of coal gangue cemented backfill pipelines,corresponding prevention measures are proposed,combined with the practice of gangue high-concentration backfill slurry pipeline transportation,a pump-backfill pipeline transportation model is established.Based on the basic theory of slurry pipeline transportation,the causes of the non-full pipeline flow are studied,and the theoretical discriminant of the dissatisfied pipe flow state is proposed.According to the movement characteristics of the slurry in the process of dissatisfied pipe flow,the effect of dissatisfied pipe flow on the pipeline transportation system was discussed.Combining case analysis,the prevention and treatment methods of the non-full pipeline flow status are analyzed and proposed.The results show that the main factors affecting the transport state of the filling slurry are the backfill flow rate,the geometric parameters and layout of the pipeline,the rheological properties and density of the slurry.During the transportation process,the filling slurry and the transportation parameters are unreasonably matched.At the top of the vertical drilled pipe,the high-concentration slurry will break off and change from one continuum to a discontinuity,resulting in a non-full pipeline flow status in pipeline transportation.With the further development of the slurry pull-off zone,an empty pipe section appears on the upper part of the vertical drilled pipe and presents a certain degree of vacuum,which is in a negative pressure state.The backfill slurry changes from a solid,liquid two-phase flow state to solid,liquid and gas three-phase flow state.The change of the slurry state deteriorates the stability of the filling pipeline transportation,and has obvious impact and harm on the pipeline transportation system,including "water hammer" impact,erosion and wear on the pipe wall,horizontal pipeline vibration,slurry siltation clogging,and filling pump damage.In order to avoid the occurrence of pipeline flow dissatisfaction,the vertical drilling position should be selected reasonably during the pipeline construction.In the actual filling work,the slurry concentration can be appropriately increased or the inner diameter of the non-main pipeline can be reduced to increase the friction resistance of the pipeline to maintain the state of full pipe flow of slurry.
The coal gangue cemented backfill slurry has high quality concentration.If the pipeline layout and transportation parameters are unreasonable,non-full pipeline flow and pipeline transportation failures are likely to occur during the backfilling process.In order to clarify the causes and hazards of non-full pipeline flow of coal gangue cemented backfill pipelines,corresponding prevention measures are proposed,combined with the practice of gangue high-concentration backfill slurry pipeline transportation,a pump-backfill pipeline transportation model is established.Based on the basic theory of slurry pipeline transportation,the causes of the non-full pipeline flow are studied,and the theoretical discriminant of the dissatisfied pipe flow state is proposed.According to the movement characteristics of the slurry in the process of dissatisfied pipe flow,the effect of dissatisfied pipe flow on the pipeline transportation system was discussed.Combining case analysis,the prevention and treatment methods of the non-full pipeline flow status are analyzed and proposed.The results show that the main factors affecting the transport state of the filling slurry are the backfill flow rate,the geometric parameters and layout of the pipeline,the rheological properties and density of the slurry.During the transportation process,the filling slurry and the transportation parameters are unreasonably matched.At the top of the vertical drilled pipe,the high-concentration slurry will break off and change from one continuum to a discontinuity,resulting in a non-full pipeline flow status in pipeline transportation.With the further development of the slurry pull-off zone,an empty pipe section appears on the upper part of the vertical drilled pipe and presents a certain degree of vacuum,which is in a negative pressure state.The backfill slurry changes from a solid,liquid two-phase flow state to solid,liquid and gas three-phase flow state.The change of the slurry state deteriorates the stability of the filling pipeline transportation,and has obvious impact and harm on the pipeline transportation system,including "water hammer" impact,erosion and wear on the pipe wall,horizontal pipeline vibration,slurry siltation clogging,and filling pump damage.In order to avoid the occurrence of pipeline flow dissatisfaction,the vertical drilling position should be selected reasonably during the pipeline construction.In the actual filling work,the slurry concentration can be appropriately increased or the inner diameter of the non-main pipeline can be reduced to increase the friction resistance of the pipeline to maintain the state of full pipe flow of slurry.
2020, 48(9): 48-55.
Abstract：
Based on the requirements of the national green industry and the development of circular economy,starting from the scientific connotation and technical system of green mining in the coal industry,it is clarified that the gob formed after coal mining is the source of ecological and environmental problems such as surface subsidence,soil erosion,gangue dumping and land occupation in mining areas that cause rock formations to move and deform and it is pointed out that the gob filling is the fundamental way to effectively protect the mining area's ecological environment.The main development history of mine filling and the main types of green filling mining in China’s coal mines are reviewed,and the principles of four types of filling mining techologies are introduced,including paste filling,gangue solid filling,ultra-high water filling and overlying strata separation zone isolation grouting filling.The filling process and technical characteristics and the corresponding research status and application results are respectively introduced,focusing on 9 aspects including filling equipment characteristics,filling process characteristics,material sources,paste delivery characteristics and stability,precise control and standardization construction.It also clarified the the main problems and challenges currently faced by coal mine green filling mining,and it is pointed out that the realization of coal mine green filling and mining requires key scientific and technological research and innovative development of new types from five aspects:theoretical research on high-cutting height filling rock formation,filling technology in ecologically fragile areas,intelligent filling technology,precise transportation of filling materials and filling policy guarantees.Key breakthroughs have been made in 5 aspects including the research and development of filling materials,key filling equipment,the construction of new intelligent filling technology,the construction of standardization systems and policy support,and the research and development of efficient waste filling treatment technology,and also prospects for the development and application of coal mine green filling mining technology.
Based on the requirements of the national green industry and the development of circular economy,starting from the scientific connotation and technical system of green mining in the coal industry,it is clarified that the gob formed after coal mining is the source of ecological and environmental problems such as surface subsidence,soil erosion,gangue dumping and land occupation in mining areas that cause rock formations to move and deform and it is pointed out that the gob filling is the fundamental way to effectively protect the mining area's ecological environment.The main development history of mine filling and the main types of green filling mining in China’s coal mines are reviewed,and the principles of four types of filling mining techologies are introduced,including paste filling,gangue solid filling,ultra-high water filling and overlying strata separation zone isolation grouting filling.The filling process and technical characteristics and the corresponding research status and application results are respectively introduced,focusing on 9 aspects including filling equipment characteristics,filling process characteristics,material sources,paste delivery characteristics and stability,precise control and standardization construction.It also clarified the the main problems and challenges currently faced by coal mine green filling mining,and it is pointed out that the realization of coal mine green filling and mining requires key scientific and technological research and innovative development of new types from five aspects:theoretical research on high-cutting height filling rock formation,filling technology in ecologically fragile areas,intelligent filling technology,precise transportation of filling materials and filling policy guarantees.Key breakthroughs have been made in 5 aspects including the research and development of filling materials,key filling equipment,the construction of new intelligent filling technology,the construction of standardization systems and policy support,and the research and development of efficient waste filling treatment technology,and also prospects for the development and application of coal mine green filling mining technology.
2020, 48(9): 39-47.
Abstract：
Coal mine filling mining technology plays a pivotal role in solid waste disposal,control of coal mining subsidence,improvement of resource recovery rate and construction of ecological mines.Since the beginning of the 20th century,the world’s mine filling and mining technology has a century of development history.According to data analysis and the types of filling materials,the filling mining technology in the 20th century experienced four development stages:dry waste filling,water sand filling,low-concentration tailings cemented filling and paste filling.The filling coal mining technology of China at that time,the application and development process of the main filling process such as water sand filling and gangue self-sliding filling were reviewed.Since the 21st century,China’s backfill mining technology has achieved rapid development,forming three types of filling materials:solid,paste,and ultra-high water,and two types of filling technologies applied to fully-mechanized and continuous mining faces.The types of solid waste utilization,the filling effect,the degree of mechanization,and the overall technical level have been greatly improved.The filling materials and their preparation and transportation,and the characteristics of the filling process of the working face were summarized.In particular,the characteristics of the filling of the fully-mechanized mining face and the production efficiency constraints were analyzed.It is proposed to reduce the time of various filling links in terms of new equipment research and development,temporary roof protection technology,and efficient sealing measures for filling spaces.Finally,combined with the practical results,from the aspects of filling coal mining capacity,surface subsidence coefficient,cost of filling mining,resource recovery rate and technical application conditions,five types of filling coal mining methods including comprehensive mining with solid filling,comprehensive mining with paste filling,comprehensive mining with ultra-high water filling,solid filling continuous mining and paste filling continuous mining were analyzed.This provides a basis for each mine to choose its own filling method.
Coal mine filling mining technology plays a pivotal role in solid waste disposal,control of coal mining subsidence,improvement of resource recovery rate and construction of ecological mines.Since the beginning of the 20th century,the world’s mine filling and mining technology has a century of development history.According to data analysis and the types of filling materials,the filling mining technology in the 20th century experienced four development stages:dry waste filling,water sand filling,low-concentration tailings cemented filling and paste filling.The filling coal mining technology of China at that time,the application and development process of the main filling process such as water sand filling and gangue self-sliding filling were reviewed.Since the 21st century,China’s backfill mining technology has achieved rapid development,forming three types of filling materials:solid,paste,and ultra-high water,and two types of filling technologies applied to fully-mechanized and continuous mining faces.The types of solid waste utilization,the filling effect,the degree of mechanization,and the overall technical level have been greatly improved.The filling materials and their preparation and transportation,and the characteristics of the filling process of the working face were summarized.In particular,the characteristics of the filling of the fully-mechanized mining face and the production efficiency constraints were analyzed.It is proposed to reduce the time of various filling links in terms of new equipment research and development,temporary roof protection technology,and efficient sealing measures for filling spaces.Finally,combined with the practical results,from the aspects of filling coal mining capacity,surface subsidence coefficient,cost of filling mining,resource recovery rate and technical application conditions,five types of filling coal mining methods including comprehensive mining with solid filling,comprehensive mining with paste filling,comprehensive mining with ultra-high water filling,solid filling continuous mining and paste filling continuous mining were analyzed.This provides a basis for each mine to choose its own filling method.
2020, 48(9): 27-38.
Abstract：
The current status of coal mining in China was introduced.The migration law of overlying strata and the basic conditions for the formation of continuous curved beams in backfilling mining were analyzed,and the quantitative relationship between continuous curved beam,filling density and key layers was obtained.The characteristics and technology of preparation and transportation of filling materials,solid filling equipment,roadway solid filling and working face solid filling technology were described.The integrated technical equipment system of solid filling mining and filling parallel operation,automatic control of filling and the integration of "mining,processing and filling" in underground coal mine were analyzed.In order to ensure the long-term effect of filling,a modified bulk solid filling technique was proposed.It is believed that filling mining should make efforts to build ecological mines in the whole process with precise filling.
The current status of coal mining in China was introduced.The migration law of overlying strata and the basic conditions for the formation of continuous curved beams in backfilling mining were analyzed,and the quantitative relationship between continuous curved beam,filling density and key layers was obtained.The characteristics and technology of preparation and transportation of filling materials,solid filling equipment,roadway solid filling and working face solid filling technology were described.The integrated technical equipment system of solid filling mining and filling parallel operation,automatic control of filling and the integration of "mining,processing and filling" in underground coal mine were analyzed.In order to ensure the long-term effect of filling,a modified bulk solid filling technique was proposed.It is believed that filling mining should make efforts to build ecological mines in the whole process with precise filling.
Abstract：
China has a large amount of coal resources that are difficult to mine due to buildings,water bodies,linear structure and confined water.Mining under building,water bodies and linear structure,and above confined water is an effective measure for resource exhausted mines to increase the resource recovery rate,extend the service life of the mines and achieve sustainable development in China.Based on the analysis of the current status of coal mining under buildings and structure,the source-controlled subsidence and damage mining method are expounded,including the filling mining,partial mining,coordinated mining,the measures to reduce deformation of buildings by grouting bed separation.By analyzing the transfer process of overburden failure caused by longwall mining,the criterion of the full mining degree of overburden failure based on the transfer process of overburden failure and its height calculation method are proposed,which reveals the formation mechanism of the height of overburden failure.The surface borehole observation method and coordinated mining have successfully applied to coal mining under water bodies in different geological mining conditions.In addition,the magnetotelluric detection were carried out to detect the destruction characteristics of loose aquifers in high-intensity mining,the destruction characteristics of loose aquifers under the influence of mining were analyzed,which revealed the destruction mechanism of loose aquifer and verified the feasibility of magnetotelluric method for detecting the damage of aquifers.Coal mining technology and safety measures of mining under buildings,water bodies and linear structure,and above confined water were summarized.Finally,the study forecasts that the development of coal mining technology under buildings,water bodies and linear structure,and above confined water in China's coal mines will be mainly based on source-controlled subsidence anddamage mining methods,overburden damage control technology.Underground in-situ protection coal mining technology will be the future trend of mining under buildings,structure and water bodies in China.
China has a large amount of coal resources that are difficult to mine due to buildings,water bodies,linear structure and confined water.Mining under building,water bodies and linear structure,and above confined water is an effective measure for resource exhausted mines to increase the resource recovery rate,extend the service life of the mines and achieve sustainable development in China.Based on the analysis of the current status of coal mining under buildings and structure,the source-controlled subsidence and damage mining method are expounded,including the filling mining,partial mining,coordinated mining,the measures to reduce deformation of buildings by grouting bed separation.By analyzing the transfer process of overburden failure caused by longwall mining,the criterion of the full mining degree of overburden failure based on the transfer process of overburden failure and its height calculation method are proposed,which reveals the formation mechanism of the height of overburden failure.The surface borehole observation method and coordinated mining have successfully applied to coal mining under water bodies in different geological mining conditions.In addition,the magnetotelluric detection were carried out to detect the destruction characteristics of loose aquifers in high-intensity mining,the destruction characteristics of loose aquifers under the influence of mining were analyzed,which revealed the destruction mechanism of loose aquifer and verified the feasibility of magnetotelluric method for detecting the damage of aquifers.Coal mining technology and safety measures of mining under buildings,water bodies and linear structure,and above confined water were summarized.Finally,the study forecasts that the development of coal mining technology under buildings,water bodies and linear structure,and above confined water in China's coal mines will be mainly based on source-controlled subsidence anddamage mining methods,overburden damage control technology.Underground in-situ protection coal mining technology will be the future trend of mining under buildings,structure and water bodies in China.
2021, 49(1): 319-330.
DOI: 10.13199/j.cnki.cst.2021.01.030
Abstract：
Xinjiang province, abundant with coal resource, is an important coal resource continuation area and strategic reserve area in China. Reasonable disposal and resource utilization of coal-based solid wastes generated during mining and utilization is one of the difficult problems restricting the environmental protection of mining areas. This paper summarizes and analyzes the physical and chemical characteristics, classification and its geological background of coal-based solid wastes in Xinjiang. The analysis shows that there are obvious regional differences in the physical and chemical characteristics of coal-based solid wastes generated in the four major coal fields of Tuha, Junggar, Yili and Kubai. The coal gangue generated in the low metamorphic coalfield area is mostly sandstone, clay rock, and calcareous rock. Through the comprehensive evaluation of typical coal-based solid wastes, the industrial chain layout model of cascade resource utilization of coal-based solid waste in Xinjiang is proposed. Based on the in-situ filling of coal-based solid wastes, a new method for the coordinated development of water-preserving mining, water purification mining, and energy storage mining is proposed. Coal-based solid waste-electricity-chemical, coal-based solid waste-electricity-construction and other high value-added development and utilization industrial layout models are discussed. Then, the principle and technical route of comprehensive resource utilization methods such as power generation utilization, building materials utilization, chemical product preparation, filling disposal and engineering filling are elaborated in detail. Finally, a high-efficiency and intensive mining technology for coal resources with the goal of rational disposal of gangue and water resources protection is proposed. These research results will have important practical significance for optimizing the layout of the coal industry, cascade resource utilization of coal-based solid wastes, and ecological environment protection in Xinjiang mining areas
Xinjiang province, abundant with coal resource, is an important coal resource continuation area and strategic reserve area in China. Reasonable disposal and resource utilization of coal-based solid wastes generated during mining and utilization is one of the difficult problems restricting the environmental protection of mining areas. This paper summarizes and analyzes the physical and chemical characteristics, classification and its geological background of coal-based solid wastes in Xinjiang. The analysis shows that there are obvious regional differences in the physical and chemical characteristics of coal-based solid wastes generated in the four major coal fields of Tuha, Junggar, Yili and Kubai. The coal gangue generated in the low metamorphic coalfield area is mostly sandstone, clay rock, and calcareous rock. Through the comprehensive evaluation of typical coal-based solid wastes, the industrial chain layout model of cascade resource utilization of coal-based solid waste in Xinjiang is proposed. Based on the in-situ filling of coal-based solid wastes, a new method for the coordinated development of water-preserving mining, water purification mining, and energy storage mining is proposed. Coal-based solid waste-electricity-chemical, coal-based solid waste-electricity-construction and other high value-added development and utilization industrial layout models are discussed. Then, the principle and technical route of comprehensive resource utilization methods such as power generation utilization, building materials utilization, chemical product preparation, filling disposal and engineering filling are elaborated in detail. Finally, a high-efficiency and intensive mining technology for coal resources with the goal of rational disposal of gangue and water resources protection is proposed. These research results will have important practical significance for optimizing the layout of the coal industry, cascade resource utilization of coal-based solid wastes, and ecological environment protection in Xinjiang mining areas
2021, 49(1): 218-224.
DOI: 10.13199/j.cnki.cst.2021.01.017
Abstract：
Paste back filling is one of the main back filling mining techniques to control overburden moment and prevent surface subsidence. In view of the mining problems of compressed coal resources under buildings, water bodies, railways and confined water bodies in the process of coal mining in eastern China, based on the mining conditions of the main mines in Jibei Mining Area of Zibo Mining Group, this paper analyzes the basic principles, process methods and applications of paste back filling, especially focusing on the analysis of strip coal pillar replacement mining, coal mining under high buildings and coal filling above floor confined water in Daizhuang Coal Mine. By applying the paste back filling mining technology, the ground deformation values are less than Ⅰ damage standard. Damage depth of working face under the threat of floor limestone water was just 6.0～6.5 m after paste back filling mining witch has significant effect to prevent floor water disasters. According to the future development direction of the Jibei Mining Area, research directions on paste back filling mining were proposed, such as theory and technology above floor confined water, protection of buildings under the influence of repeated mining, optimization of filling process, equipment and flow under complex conditions, combination between underground coal - gangue intelligent separation system and paste back filling mining. The research results will provide important reference for deepening application of paste back filling mining in the Jibei Mining Area.
Paste back filling is one of the main back filling mining techniques to control overburden moment and prevent surface subsidence. In view of the mining problems of compressed coal resources under buildings, water bodies, railways and confined water bodies in the process of coal mining in eastern China, based on the mining conditions of the main mines in Jibei Mining Area of Zibo Mining Group, this paper analyzes the basic principles, process methods and applications of paste back filling, especially focusing on the analysis of strip coal pillar replacement mining, coal mining under high buildings and coal filling above floor confined water in Daizhuang Coal Mine. By applying the paste back filling mining technology, the ground deformation values are less than Ⅰ damage standard. Damage depth of working face under the threat of floor limestone water was just 6.0～6.5 m after paste back filling mining witch has significant effect to prevent floor water disasters. According to the future development direction of the Jibei Mining Area, research directions on paste back filling mining were proposed, such as theory and technology above floor confined water, protection of buildings under the influence of repeated mining, optimization of filling process, equipment and flow under complex conditions, combination between underground coal - gangue intelligent separation system and paste back filling mining. The research results will provide important reference for deepening application of paste back filling mining in the Jibei Mining Area.
2021, 49(2): 61-68.
DOI: 10.13199/j.cnki.cst.2021.02.008
Abstract：
backfilling mining is an important way to realize safe, green mining in mines. However, backfilling materials require a wide range of sources, low cost, and must meet the backfilling effect. Therefore, many researchers and technicians have devoted a lot of energy to research and develop new paste backfilling materials. Based on the engineering background of Guangxi’s Baise Zhoujing Coal Mining, this paper considers replacing fly ash with laterite, which is convenient and low-cost, and mixes it with coal gangue and cementing materials to make laterite paste backfilling materials. By measuring the slump, expansion and bleeding rate of red clay paste backfilling materials with different proportions and different slurry concentrations, and using the RYL-600 shear rheometer to perform uniaxial compression tests, the compressive strength and Modulus of elasticity, analysis of the strength characteristics of red clay paste backfilling materials, and the influence of material ratio and slurry concentration on its performance. From the test data, it is found that compared with the traditional fly ash type backfilling material under the same conditions, the laterite type backfilling material has little difference in strength, and the laterite type has the advantages of low cost, convenient material acquisition and no pollution to the environment. The dry material mass fraction has the greatest impact on the strength of the backfilling, and the performance is optimal when it is 80%;as the content of red clay increases, the strength of the backfilling will decrease, the data shows that the mass ratio of laterite to cement meets the backfilling requirements at 1∶1, 1∶2, 2∶1, and the ratio of gangue∶laterite∶cement = 6∶2∶1, the backfilling material not only meets the requirements of the paste backfilling process, but also reduces the backfilling cost. Using red clay to prepare paste backfilling materials can rationally utilize resources, reduce costs, and provide reference opinions for backfilling mining, which has certain reference value.
backfilling mining is an important way to realize safe, green mining in mines. However, backfilling materials require a wide range of sources, low cost, and must meet the backfilling effect. Therefore, many researchers and technicians have devoted a lot of energy to research and develop new paste backfilling materials. Based on the engineering background of Guangxi’s Baise Zhoujing Coal Mining, this paper considers replacing fly ash with laterite, which is convenient and low-cost, and mixes it with coal gangue and cementing materials to make laterite paste backfilling materials. By measuring the slump, expansion and bleeding rate of red clay paste backfilling materials with different proportions and different slurry concentrations, and using the RYL-600 shear rheometer to perform uniaxial compression tests, the compressive strength and Modulus of elasticity, analysis of the strength characteristics of red clay paste backfilling materials, and the influence of material ratio and slurry concentration on its performance. From the test data, it is found that compared with the traditional fly ash type backfilling material under the same conditions, the laterite type backfilling material has little difference in strength, and the laterite type has the advantages of low cost, convenient material acquisition and no pollution to the environment. The dry material mass fraction has the greatest impact on the strength of the backfilling, and the performance is optimal when it is 80%;as the content of red clay increases, the strength of the backfilling will decrease, the data shows that the mass ratio of laterite to cement meets the backfilling requirements at 1∶1, 1∶2, 2∶1, and the ratio of gangue∶laterite∶cement = 6∶2∶1, the backfilling material not only meets the requirements of the paste backfilling process, but also reduces the backfilling cost. Using red clay to prepare paste backfilling materials can rationally utilize resources, reduce costs, and provide reference opinions for backfilling mining, which has certain reference value.
2021, 49(3): 83-91.
DOI: 10.13199/j.cnki.cst.2021.03.010
Abstract：
Coal resources provide the basic power for the development of Chinese industry and economic society, but its large-scale mining and utilization has brought a series of environmental problems. In order to solve the problem of solid waste emission and environmental pollution commonly faced by Chinese coal industry, the specific requirement of the new solid waste treatment technology was clarified by summarizing the development course and technical bottleneck of traditional technology, and the technical conception of fluidization slurry backfilling technology was put forward innovatively, its technical connotation and advantages were expounded, six core technologies of fluidization slurry treatment technology were introduced in detail, Namely: intelligent pipeline transportation technology, four-dimensional collaborative filling technology, scientific and accurate pulping technology, mining overburden drilling technology, holographic remote control technology and safety production guarantee technology. On this basis, two development directions were put forward. including underground intelligent separation + on-site slurry backfilling and intelligent slurry backfilling. The technical framework of slurry treatment of solid waste logistics in coal mine was preliminarily formed, and the actual design case was given to illustrate. The proposal of fluidization slurryfilling technology provides a new solid waste treatment method for Chinese mining enterprises, which enriches the solid waste treatment technology system of coal industry in China, and lays a foundation for the realization of green mining, clean utilization and zero waste emission of coal resources.
Coal resources provide the basic power for the development of Chinese industry and economic society, but its large-scale mining and utilization has brought a series of environmental problems. In order to solve the problem of solid waste emission and environmental pollution commonly faced by Chinese coal industry, the specific requirement of the new solid waste treatment technology was clarified by summarizing the development course and technical bottleneck of traditional technology, and the technical conception of fluidization slurry backfilling technology was put forward innovatively, its technical connotation and advantages were expounded, six core technologies of fluidization slurry treatment technology were introduced in detail, Namely: intelligent pipeline transportation technology, four-dimensional collaborative filling technology, scientific and accurate pulping technology, mining overburden drilling technology, holographic remote control technology and safety production guarantee technology. On this basis, two development directions were put forward. including underground intelligent separation + on-site slurry backfilling and intelligent slurry backfilling. The technical framework of slurry treatment of solid waste logistics in coal mine was preliminarily formed, and the actual design case was given to illustrate. The proposal of fluidization slurryfilling technology provides a new solid waste treatment method for Chinese mining enterprises, which enriches the solid waste treatment technology system of coal industry in China, and lays a foundation for the realization of green mining, clean utilization and zero waste emission of coal resources.
- Previous: 2022-06-16
- Next: 2022-06-08
