The present invention discloses a multi-energy complementary system for a co-associated abandoned mine and a use method. The multi-energy complementary system for a co-associated abandoned mine includes a mining mechanism, a grouting mechanism and an energy mechanism. In the present invention, the mining of coal and uranium resources is realized through the mining mechanism, the subsidence and seepage reduction of the stratum is realized through the grouting mechanism, and the effective utilization of waste resources is realized through the energy mechanism. Finally, with the efficient cooperation of the three mechanisms, safe and efficient development and utilization of co-associated resources in the full life cycle are realized, and the purposes of green and efficient mining of coal and uranium resources and secondary development of a coal seam goaf are achieved, thereby facilitating the realization of dual-carbon goals and the development of low-carbon green energy.

An aggregate slinger for an underground void stabilization system, the aggregate slinger comprising a vertically extending shaft and a number of dispersing members. The vertically extending shaft is inserted through a ground hole into an underground void and rotated about a vertical axis in the ground hole. The dispersing members are configured to extend radially from a lower end of the vertically extending shaft in the underground void so that the dispersing members radially spread aggregate descending into the underground void from the ground hole to form a radially enlarged support column of aggregate in the underground void.

Treatment technology directed to using mine waste as a raw material to manufacture a mine filling product for use as a suitable precursor product or mine filling product to be used as a backfill material to close a mine. The precursor product or mine filling product retains its metals and is not be able to generate acidity. According to the disclosure, the precursor product or mine filling product, when placed in a mine, may also remove metals from mine fluids in the mine it contacts, and still retain the metals it hosted when it was a mine waste prior to it being used as a raw material to manufacture the precursor stowing backfill product.

A method for recovering room-mining coal pillars by solid filling in synergy with artificial pillars. Solid materials and cementing materials on the ground are conveyed through a feeding well and a pipeline to a room-and-pillar goaf, a plurality of artificial pillars is cast at an interval in a coal room area, and gangue is cast to fill other regions of the coal room using a gangue casting machine. Under joint support by the artificial pillars and the coal room filler, coal pillars are recovered using a continuous coal mining machine, artificial pillars are cast in the original coal pillar area after recovery, and gangue is cast to fill the original coal pillar area using the gangue casting machine. A system for recovering room-mining coal pillars by solid filling in synergy with artificial pillars mainly includes a material conveying system, a joint support system, and a coal pillar recovery system. By constructing pillar grooves, casting artificial pillars, casting gangue to fill a goaf, and recovering coal pillars, the recovery rate of coal resources can be increased, and room-mining coal pillar recovery theories and technologies in China can be enriched while harmonious development of environmental protection and resource exploitation is promoted.

The present invention discloses a dendritic reverse underground mining method for a thin coal seam at an end slope of a strip mine. The method includes the following steps: step S1: using a continuous coal mining machine to excavate a main adit toward a boundary of the strip mine along a seam floor; step S2: excavating secondary adits on two sides of the main adit obliquely in a forward direction of the main adit; step S3: transporting the excavated coal out of the main adit by the self-moving belt conveyors; step S4: after the excavating of a secondary adit of the secondary adits is ended, withdrawing the continuous coal mining machine and the self-moving belt conveyor from the secondary adit, and then excavating subsequent secondary adits of the secondary adits in a similar way; step S5: filling the secondary adits, and filling a goaf of the main adit.

Polyamide foams which inhibit the spread of fires for filling cavities in mining Polyamide foams which do not propagate fire are obtained by mixing (i) a liquid isocyanate component which comprises at least one polyisocyanate and in which the molar ratio of aromatic isocyanate groups to the sum of aromatic and aliphatic isocyanate groups is at least 60 mol %, with (ii) at least one liquid isocyanate-reactive component which comprises a reactive diluent, and the reactive diluent comprises (a) a chain-extending and/or crosslinking reactive diluent selected from among aliphatic branched C.sub.24-66-polycarboxylic acids, alicyclic C.sub.24-66-polycarboxylic acids and partial esters of polycarboxylic acids having at least two unesterified carboxyl groups and/or (b) a chain-terminating reactive diluent selected from among aliphatic branched C.sub.24-66-monocarboxylic acids, alicyclic C.sub.24-66-monocarboxylic acids and partial esters of polycarboxylic acids having one unesterified carboxyl group, and (iii) optionally a solid isocyanate-reactive component, where the liquid isocyanate-reactive component and/or the solid isocyanate-reactive component comprises an aromatic C.sub.8-18-polycarboxylic acid and/or an anhydride thereof. Reactive diluents are dimeric fatty acids or trimeric fatty acids, which are optionally hydrogenated. The foams are suitable for filling cavities in mining, tunnel construction, civil engineering or in oil and gas recovery, as fire protection foam, thermal insulation or acoustic damping.

A feed apparatus for feeding cement to a cement silo of a mining machine includes a receptacle for receiving cement, a transfer tube connected at a first end of the receptacle for guiding the cement from the receptacle to the cement silo connectable at a second end of the transfer tube and transfer means arranged in connection with the transfer tube and arranged to move cement within the transfer tube from the receptacle to the cement silo. The transfer tube includes at least one transfer tube section having a tube-like inner space for cement to be transferred.

The present disclosure provides a cemented filling material with bionic structure, a preparation method and an application thereof, and belongs to the field of structural modification methods of cemented filling materials and research and development of civil materials with ultra-high energy absorption characteristics. The cemented filling material with bionic structure includes a bionic honeycomb skeleton and cemented filling slurry, where the cemented filling slurry is poured in the bionic honeycomb skeleton.

A method and an apparatus for creating a void, low-density fill or combination of void and low-density fill for underground mining having at least one module of formwork to be positioned in an open slope of an underground mine prior to carrying out a backfilling operation.

A method for efficiently treating spontaneous ignition of the remaining coal in a large area goaf of a shallow-buried coal bed, which method integrates leaking stoppage, airflow control and fast inerting and cooling so as to efficiently prevent and treat the spontaneous ignition of the remaining coal in the large area goaf of the shallow-buried coal bed.