Method for developing coal with benching and backfilling in adjacent stope drifts of wangeviry type
FIELD: mining engineering.
SUBSTANCE: bench method for coal development with backfilling the adjacent stope drifts of wangeviry type. The main transport drift and adjacent stope drifts are arranged in accordance with the wangeviry method, selecting locations for a plurality of adjacent stope drifts at multiple development stages and perform benching according to the division into multiple development stages, and the coal pillars are not reserved between the adjacent stope drifts. The main transport drift is the main transport route, and the adjacent stope drifts are the drifts of mining coal. The extraction in all adjacent stope drifts is carried out consecutively with the benching method according to the design development sequence, as well as consecutive and in time backfilling is performed. The coal deposits in which excavation is not carried out or the backfilled adjacent stope drifts are used as supports for bearing back from both sides of the adjacent stope drifts. In adjacent stope drifts consecutive excavation is performed in several development stages and in the result the development is performed without coal pillars.
EFFECT: method allows to perform effective control of cracks, caused by the development of upper layers and ground surface sagging, providing safety and efficiency of stope drift with coal squeezed under buildings, railways and water bodies, and effective control of ground surface sagging.
2 cl, 5 dwg
SUBSTANCE: slag includes acid electrolyte with solution density ρ=1.310 g/cm3, and slag of steel-smelting production is electric steel-smelting slag. The cement-free binder including slag of steel-smelting production, burnt rocks of mine dump and slag produced as a result of neutralisation of spent electrolytes of acid accumulators by lime, contains electric steel-smelting slag as slag of steel-smelting production, and slag contains electrolyte with solution density ρ=1.310 g/cm3 at the following ratio, wt %: burnt rocks 14, steel-smelting slag - electric steel-smelting 78, slag 8.
EFFECT: increased strength.
SUBSTANCE: filling mixture compound including a binding agent, an inert filler and water, where the binding agent and the inert filler are made from ore benefication wastes, with a fraction size of not more than 20 mm, one part of which is subject to dry activation by preliminary agitation leaching, separation of a liquid phase, drying and activation in a disintegrator, and the other part is mixed with a leaching solution; the obtained pulp is activated in the disintegrator; the liquid phase is separated; a deposit is dried and a dry mixture of the compound is prepared, wt %: a binding agent - the specified product of dry activation 42, inert filler - the specified deposit 58; after that, water is added in terms of 280-290 l per 1 m3 of dry mixture; rotation speed of a working element of the disintegrator is at least 200 Hz.
EFFECT: achievement of sufficient strength at reduction of content of metals and cost.
SUBSTANCE: stowing composition comprising portland cement, plastifying agent, fine-grained filler - sand and water, additionally comprises as a binder the milled tailings of wet magnetic separation of ferrous quartzites with an average particle size of 2.071 microns, as a plastifying agent - superplasticiser SP-1, and the sand with an average particle size of 62.26 microns with the following ratio of components, wt %; the said cement - 13.48; the said sand - 56.43; the said wastes - 2.70; superplasticiser SP-1 - 0.138; water - the rest.
EFFECT: decrease in cement consumption, and increase in the strength of the stowing composition, use of sand with a lower fineness modulus.
1 ex, 2 tbl
SUBSTANCE: invention relates to mining industry and may be used in development of thick edge ore bodies with unstable ores, for instance, kimberlite pipes, by the underground method. The method includes division of a deposit into panels and layers with their extraction in stopes in descending order and subsequent filling with hardening mixtures, parameters of layer stoping are increased along height and width to chamber dimensions, and along the length they are divided into sections, besides, chamber stopes and sections in the vertical-longitudinal section are given the shape of the isosceles trapezoid. Then their mining is carried out in stages so that during mining of each subsequent section the level of the haulage horizon is reduced by the height of the sectional haulage mine, for this purpose, initially, in the chamber-stop roof for all of its sections they arrange a common drilling-filling mine, and the sectional haulage mine, for each subsequent section, is mined under the filling massif of the earlier mined section, besides, after complete mining of the previous section its haulage mine in the reverse order is expanded to the width of the previously filled section, at the same time the direction of mining of chambers-stopes on each subsequent underlying layer is changed for the opposite one.
EFFECT: increased intensity of deposit mining in case of unstable ores, due to provision of stability of ore walls of stope entries during the whole period of performance of stoping works and exclusion of breaks in a filling massif, and also improved conditions for ventilation of mines.
2 cl, 1 dwg
SUBSTANCE: invention relates to mining industry and may be used in development of thick steeply-dipping valuable ore bodies by the open-underground method. The method includes development of a pit to design depth with arrangement of the board to the limit position, mining of bottom and near-edge-zone reserves of ore with application of underground mines, transportation of broken ore in underground mines. Development of near-edge-zone reserves of the ore is carried out after extraction of bottom ones with a chamber system of development under protection of a combined rock-filling massif at the side of the pit space, besides, the rock-filling massif is formed as bottom up in layers, alternating filling of the waste rock and filling of the hardening filling mixture of the formed space between the dump and the board of the pit on each layer.
EFFECT: reduced losses and dilution in mining of near-edge-zone reserves of ore from overlying rocks.
3 cl, 1 dwg
SUBSTANCE: invention relates to mining industry and may be used in development of mineral fields with filling of the mined space. The composition of the filling mass includes portland cement, a filler and water, besides, it additionally comprises a surfactant of a superplasticiser SP-1, and the filler is represented by stale wastes of dressing of wet magnetic separation of ferruginous quartzites and converter sludge at the following ratio of components, wt %: portland cement - 8.0; specified sludge - 12.70; specified wastes - 56.64; superplasticiser SP-1 - 0.08; water - balance.
EFFECT: exclusion of natural fillers, increased mobility of filling mass and increased volumes of recycled anthropogenic wastes for considerable improvement of environment in the region.
SUBSTANCE: invention relates to mining industry, namely, to undermining of ore bodies with filling of the mined space with hardening mixes. The method to determine extent of undermining of hardening fill under mechanical damage of ore massif includes formation of a hole in the ore massif and fixation of a stiff rod in it for fixed depth, supply of hardening filling mix into the mined space, damage of the ore massif with a part of the contact layer of the hardening fill massif. When mining the ore massif, they damage the rod in the ore massif and in the contact layer of the hardening fill massif, and the extent of undermining of hardening fill is determined according to the difference in the following formula: Δ=L-L1-L2, where Δ - extent of undermining of the hardening fill massif; L - total length of blind cavity, arranged inside the rod; L1 - length of rod deepening in the hole of the ore massif; L2 - length of blind cavity that is left after damage of the ore massif.
EFFECT: invention makes it possible to determine extent of undermining of hardening fill massif.
SUBSTANCE: invention proposes a preparation method of a porous hardening mixture for stowing of the mined-out underground space, which involves joint crushing and grinding of a mineral filler and a binding agent in a cone-type inertia crusher, mechanical activation of the obtained mixture, addition of water to the mixture and its supply to the stowed space. Besides, mechanical activation of the mixture is performed till water is added to it at the value of crushing force of (4÷8)·105 N. And before the mixture is supplied to the stowed space, foam is added to the stowing mixture.
EFFECT: reduction of a binding agent consumption at sufficient strength of a stowing mixture.
SUBSTANCE: method includes tunnelling of a complex of stripping, preparatory and cutting underground mines, ore breaking and delivery, mine pressure maintenance, transportation, lifting of ore to a horizon of a ore-collecting hopper. Stopes are mined with the help of chamber systems with subsequent filling of the mined space. Tunnelling of a row of mines and process chambers is carried out outside the ore massif in foot wall rocks. Two separate mobile grinding modules are installed in process chambers, which are connected to each other by systems of transportation of a solid stowing mix components, including broken rock. The first module of coarse grinding is placed in preparatory or cut mines, and the second one - fine grinding directly above the filled space and combined with a module for mixing of the solid stowing mix, at the same time unloading from the module of fine grinding is carried out via a receiving tray and a well into the filled space. Grinding of rocks in the fine grinding module is provided to the content of - 0.074 class not below 32%.
EFFECT: invention makes it possible to improve efficiency of mining.
2 cl, 1 dwg
SUBSTANCE: composition of a mixture for filling of mined space includes wastes of enrichment processes, lime, sodium lignosulfonate and water. The specified wastes are current tails of floatation dressing of polymetal ores with moisture of less than 30% at the following content of components, kg/m3: current tails of floatation enrichment of polymetal ores with moisture of less than 30% 1800 - 2010, lime 80 - 120, sodium lignosulfonate 1.2 - 1.5 and water - balance to 1 m3. The method to manufacture the composition of the mixture for filling of the mined space includes drying of current tails of floatation enrichment of polymetal ores to moisture content of less than 30%. Sodium lignosulfonate is previously dissolved in water, and then mixed with dried tails and lime.
EFFECT: simplified and cheaper filling mixture with preserved operating properties.
3 cl, 1 tbl
SUBSTANCE: method comprises preparing a panel by carrying out in-seam workings in the upper layer, followed by workings in the lower layer and joint mining layers in reverse order. To prepare the excavation site the ventilation and conveyor gates on the upper and lower layers to the border of the panel are carried out, where they are connected by mounting cameras in which the mechanized complexes are mounted. On the rear fences of hydroficated baring of the upper layer the additional fences are mounted, moving on rollers on the upper lining of the hydroficated baring of the lower layer. When leaving the pillars on the flanks of stope in the upper layer in hydroficated sections of the baring mounted on the flanks in the lower layer, the windows are equipped for release of carbon to the face conveyor. When non-pillar method of preparing on the conveyor and ventilation gates of the lower layer, travelled with coal-cutting with stone to gates of the upper layer, the face-end support is mounted, on which the sections of the hydroficated baring of the complex of the upper layer are moved.
EFFECT: invention enables to increase the safety and the concentration of mining operations, and reduce the amount of development workings on the rock.
SUBSTANCE: invention relates to mining industry and can be used for mining. The method of methane capture during mining of coal layers by a power mining complex comprises the mining of a coal layer using the sections of a powered roof support with box-shaped top covers of a face conveyor and combine. Simultaneously with coal extraction, transportation through a face and preparatory developments, through the holes in the box-shaped top covers and telescopic branch pipes methane is pumped out. From a production face all box-shaped top covers of sections are joined among themselves with corrugated branch pipes of a certain length equal to an advance increment of the powered roof support.
EFFECT: invention allows to implement the comprehensive and rational coal use in subsoil due to efficient by-product extraction of methane, reduce net cost of coal, provide safe mineral development.
SUBSTANCE: as per a shield mining system, the method involves field preparation of a mine section of a bed developed by transport and ventilation crossways, division of the mine section as to spread of the bed into extraction strips restricted as to width by performance of two inclined workings, provision of an installation chamber on the level of the ventilating entry, installation in it of sectional shield roofing, development of coal wells, extraction of coal under the shield roofing and gravity handling of broken-down coal via coal wells to the transport entry. Before the beginning of coal extraction, the first inclined working is performed so that it restricts the extraction strip on one side. On the other side, the extraction strip is restricted with the number of sections of the shield roofing. Extraction and cutting of coal under the shield roofing is performed in a mechanised manner in beds that are provided with an inclination towards the first inclined working, and gravity handling of broken-down coal is arranged via chutes along a working face. As far as inclined beds are being developed, on the other side of the extraction strip, in the worked-out area there erected is the second inclined working providing a spare exit of the working face and its ventilation. As far as the working face approaches the lower boundary of the extraction strip, execution of the transport entry is performed in the direction from the second inclined working to the first one. From the same entry, wells are drilled in line with each section of the shield roofing, via which gravity handling of coal broken down under the shield roofing is performed.
EFFECT: invention allows improving efficiency and safety of development.
SUBSTANCE: invention relates to mining, to mechanised steep bank excavation of medium power in bands down dip. The method comprises preparation of the extraction column and extraction band by mining. At the junction of the mounting chamber with coal chute the second mounting chamber is made, which workspace is supported by face-end support strutted between the roof and the layer soil. Each layer of the soil is imparted with the horizontal gradient of not less than the angle providing gravity handling of the chipped coal on the chutes. The multislice mining of coal is carried out using a swept cutter tool, made in the form of a horizontally oriented drum with cutters mounted on the sides of the front section of the chute. Supply of the cutting tool is carried out by moving the front section of the chute to bottom hole, its moving in the opposite direction is carried out by moving the front section of the chute towards the coal chute. The direction of the drum rotation of the cutting tool provides cutting coal from the bottom upwards. The chute flight is enlarged using spare chutes, and the second mounting chamber is elongated to the extent of mining the layers in the band. Removal of stabilising pillar is carried out using cutting actuating tools of the sections of the expanding shield overlap.
EFFECT: invention enables to improve the efficiency and safety of mining by organising gravity handling of chipped coal.
SUBSTANCE: method of complex development of coal deposits comprises drilling the system of blast injection and gas removal holes that are hydraulically connected by the coal bed, the implementation through them of the hydrodynamic influence to form a zone of artificial cavities and cracks and fire impact on the coal bed to form a combustion source displaced from the blast injection hole towards the gas removal hole, obtaining crude producer gas, cooling it to a temperature below the condensation temperature of the components in the composition of the crude gas, and obtaining together with the purified gas other beneficial components. The attribute of the method is that in the space between the blast injection and the gas removal holes the series of feeding holes is drilled equidistant from each other from the surface into the zone of artificial cavities and cracks, into the combustion source first by blast injection, and then, as displacement of the combustion source and along the feeding holes the mineral dust is supplied, containing chemically active element, at the output of the gas removal hole the producer gas is separated, isolating from it the gaseous compounds of valuable chemical elements and converting them into free-running state for removal of valuable elements.
EFFECT: improving the efficiency of complex development of coal deposit.
SUBSTANCE: method comprises sinking of gate road on two seams, holed by slopes, airing dead ends using ventilation systems of local ventilation and broken ore supply from sinking of gate road on the upper seam through the pre-passing wells to the conveyor line mounted on the lower seam. The gate and the belt roads along the lower seam pass in direct order to the border of the working area and their airing is carried out by general shaft depression on turning point scheme using the most remote inter-gate holing. Then sinking of spiral slope to the upper seam is carried out, and then in reverse order the gate road is passed on the upper seam with its airing through the wells, with the fans mounted on them. After holing of the gate road with air gates of the upper seam, airing is carried out on turning point scheme with the movement of air in the direct order on the workings on the lower seam, and with a backward motion of air in the workings of the upper seam.
EFFECT: invention enables to increase the efficiency of development by reducing the scope of development workings and time for preparation of the working area.
3 cl, 5 dwg
SUBSTANCE: coal-rock technological complex of industrial site comprises the powerhouse of the slanting hole with the premises of coal-preparation, the coal-rock gallery, the rock hopper, the boom of scattering coal to the warehouse, the receiving funnels with the output to the station of loading coal to the cars. In the premises of the slanting hole coaxially in the vertical plane, the tray of the remote drum of the inclined conveyor is located, the drum crusher, the loading devices - coal and rock with terminal end heads of the coal-rock conveyor belt. In the coal-rock gallery the four-floor band blade for the rock and coal, the driving head with tension device and the remote drums are located - the rock over the rock hopper with window and tray, the coal over the loading device of the swinging boom. The point of interspersing of coal flow is combined with the axis of rotation in the horizontal plane of the swinging circle of the boom, the fixed base of which is fixed to the rock hopper, partially overlapping it from above.
EFFECT: invention enables to increase reliability of operation of the device and reduces the cost and time of construction of mines.
2 cl, 2 dwg
SUBSTANCE: method of development comprises preparing of the extraction column carrying out conveyor and ventilation drifts, preparing of winning band by performing off end and near slopes along the downwards line at the soil of layer from the conveyor to the ventilation drift on both sides of the band, performing the mounting chamber at the ventilation drift, mounting of sections of aggregated timber in it, coal extraction with low-inclined layers by the shearer of front action and transportation of coal along the bottom hole of self-propelled car to off end slope , in inclination of the extracted layer towards the near slope, or to the near coal chute slope, in inclination of the extracted layer towards the off end slope, change in the direction of inclination of the layer and turn of the combine in the chamber, which is carried out outside of the winning band. And the self-propelled car is equipped with an automated control system. At that from the overlap of each section of the aggregated timber towards the soil layer a signal is given, corresponding to the order number of the timber section, this signal is received by the receiving device mounted on the self-propelled car, and is transmitted to the automated control system. After changing the direction of inclination of the layer setting up of the control system of the self-propelled car is carried out, which, depending on the combination of numbers of the received signals and the degree of loading the body, ensures actuation of actuators of the self-propelled car - movement back and forth, drive-brake, loading-unloading, stop.
EFFECT: increased efficiency and safety of the development of powerful steeply inclined layers due to organisation of the automated control system of the self-propelled car for transporting loosened coal.
SUBSTANCE: method of comprehensive development of brown coal deposits comprises dividing the deposits into blocks, drilling drainage wells and underground coal gasification, dissolution of ash and slag residues of coal and pumping of productive solution to the surface for subsequent extraction of valuable components, filling the goaf of the block with the filling material. Six rows of vertical wells are drilled, located in a block with the distance of 20-25 m from one another, which are sequentially used as drainage, productive for the gasification of coal, for dissolution and extraction of ash and slag residuals of coal, and for injection of filling mixture. In each row 10-12 vertical wells are located at a distance of 15-20 m from one another. Underground water is pumped and directed through the unit of water treatment to consumer. Underground coal gasification gas is purified from impurities in the unit of energy gas purification and burned in a local gas electric station. The resultant carbon dioxide is injected in the filling mass via the storage unit and the productive solution is purified from the solid impurities and pumped through a pipeline to a chemical-technological unit connected with the filling complex by the unit of unutilised wastes.
EFFECT: effective comprehensive use of brown coal deposits and comprehensive protection of the environment from the production process impact.
1 dwg, 2 tbl
SUBSTANCE: method comprises advance extraction of underlying protective coal beds. Beds are divided into gateways to be prepared by dual development drifts with coal pillars left there between. Gateway is extracted by longwall with top rocks fall in worked-out area. It includes recovery of one preparatory gateway behind the longwall and supporting of second preparatory gateway behind the longwall for its reuse at extraction of adjacent gateway. At extraction of adjacent beds at mine field sections complicated by disjunctive geological disturbances orientation of said disturbances in space is defined. Dual development drifts extend in foot wall of said disturbance parallel with intersection of protective bed with the surface of disturbance shifter. Boundary of gateway and preparatory drift recovered behind the longwall is located in the line of intersection between protective bad and shifter of disjunctive geological disturbance.
EFFECT: higher efficiency of protected layer degassing, lower costs, higher efficiency of second working.
SUBSTANCE: method includes drilling of the single down wells with placement there of explosive charges, consecutive detonation of single down wells and formation of a compensation crack along the contact ore - rock with formation of a concave exposure surface in solid ore, rows of concave wells in the ore cavity are arranged in congruent manner to a concave exposure of the compensation crack at the distance equal to the least resistance line, the last row is arranged along the line of the contact ore - rock, rings of wells are drilled with insufficient drilling 1 m to the contact ore - filling, finally the rows of rings of wells are drilled at the boundary with the compensation crack, in the wells the explosive charges are placed with insufficient charge, rows of rings of wells are blasted with delayed action to the surface of exposure of the compensation crack, and finally a row of rings of wells at the contact ore - rock is blasted.
EFFECT: invention allows to improve safety and efficiency of conducting explosive works.
3 dwg, 1 ex