Abstract: An inclined shaft continuous feeding system for solid backfilling materials includes a surface loading system, an inclined shaft transportation system, and a downhole unloading system. The inclined shaft transportation system is arranged between the surface loading system and the underground unloading system. The inclined shaft transportation system includes a bottom unloading dumper, support guide wheels, a guide rail, a drive wheel, a reverse wheel, and a traction steel wire rope configured between the drive wheel and the reverse wheel. The present invention can realize a steady, continuous and efficient transportation of the solid backfilling materials from the surface to down hole. Moreover, the material transportation system does not wear easily, has long service life and low material transportation cost.

Abstract: A method for mining an ultra-thick coal seam by utilizing a goaf solid backfilling technique is suitable for mining an ultra-thick coal seam having a thickness of 25 m-45 m. According to the method, the ultra-thick coal seam is sliced into three slices, i.e. an upper slice, a middle slice and a lower slice. First, the middle slice is subjected to solid backfilling and mining. Metal meshes are paved along a working face of the floor. The backfilling layer serves as an artificial floor for mining the upper slice and an artificial roof for mining the lower slice. Then, the upper slice is mined by the top coal caving mining based on the artificial floor formed by backfilling the goaf of the middle slice. Finally, the lower slice is mined by the top coal caving mining along the coal seam floor with the shield of the artificial roof.

Abstract: A method for mining an ultra-thick coal seam by utilizing a goaf solid backfilling technique is suitable for mining an ultra-thick coal seam having a thickness of 25 m-45 m. According to the method, the ultra-thick coal seam is sliced into three slices, i.e. an upper slice, a middle slice and a lower slice. First, the middle slice is subjected to solid backfilling and mining. Metal meshes are paved along a working face of the floor. The backfilling layer serves as an artificial floor for mining the upper slice and an artificial roof for mining the lower slice. Then, the upper slice is mined by the top coal caving mining based on the artificial floor formed by backfilling the goaf of the middle slice. Finally, the lower slice is mined by the top coal caving mining along the coal seam floor with the shield of the artificial roof.

Abstract: An inclined shaft continuous feeding system for solid backfilling materials includes a surface loading system, an inclined shaft transportation system, and a downhole unloading system. The inclined shaft transportation system is arranged between the surface loading system and the underground unloading system. The inclined shaft transportation system includes a bottom unloading dumper, support guide wheels, a guide rail, a drive wheel, a reverse wheel, and a traction steel wire rope configured between the drive wheel and the reverse wheel. The present invention can realize a steady, continuous and efficient transportation of the solid backfilling materials from the surface to down hole. Moreover, the material transportation system does not wear easily, has long service life and low material transportation cost.

Abstract: A method for removing a hydraulic support for solid filling coal mining includes digging a support removing channel (3) in a coal body (2) in front of the hydraulic support (1), and laying a support removing track (4), then removing the hydraulic support from a coal conveying gateway (11) to a track gateway (5), temporary supporting is carried out by matching a single supporting column with a n-type steel beam before each hydraulic support is removed. A supporting roof is reinforced in time by means of erecting a crib (13) and grouting after each hydraulic support is removed, three grouting pipelines (12) are laid after the supports of the whole work surface are removed, and grouting is carried out in the whole finishing cut space. The roof of the support removing space of the work surface is stable so that the hydraulic supports on the work surface of solid filling coal mining are ensured to be safely and efficiently removed.

Abstract: A method for removing a hydraulic support for solid filling coal mining includes digging a support removing channel (3) in a coal body (2) in front of the hydraulic support (1), and laying a support removing track (4), then removing the hydraulic support from a coal conveying gateway (11) to a track gateway (5), temporary supporting is carried out by matching a single supporting column with a n-type steel beam before each hydraulic support is removed. A supporting roof is reinforced in time by means of erecting a crib (13) and grouting after each hydraulic support is removed, three grouting pipelines (12) are laid after the supports of the whole work surface are removed, and grouting is carried out in the whole finishing cut space. The roof of the support removing space of the work surface is stable so that the hydraulic supports on the work surface of solid filling coal mining are ensured to be safely and efficiently removed.

Abstract: In one aspect, methods of storing one or more combustion waste products are described herein. Combustion waste products stored by a method described herein can include solid combustion waste products such as coal ash and/or gaseous combustion products such as carbon dioxide. In some embodiments, a method of storing carbon dioxide comprises providing a carbon dioxide storage medium comprising porous concrete having a macroporous and microporous pore structure and flowing carbon dioxide captured from a combustion flue gas source into the pore structure of the porous concrete.

Abstract: In one aspect, methods of storing one or more combustion waste products are described herein. Combustion waste products stored by a method described herein can include solid combustion waste products such as coal ash and/or gaseous combustion products such as carbon dioxide. In some embodiments, a method of storing carbon dioxide comprises providing a carbon dioxide storage medium comprising porous concrete having a macroporous and microporous pore structure and flowing carbon dioxide captured from a combustion flue gas source into the pore structure of the porous concrete.