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Method of reinforcing filling mass Method comprises placement in the formed array of the reinforcement material simultaneously with the hardening mixture, at that the reinforcement material is used as the rubber powder in an amount of 1% by weight of the hardening mixture. |
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Mixing-activating device for liquid media Mixing-activating device for liquid media comprises a working chamber, nozzles, confusers, a partition with concentric profiled holes, reflectors which are spring-loaded in the working chamber, the confusers are located in the ejection chambers, at the output end of which a partition is located in the form of a rotating disk interconnected with the electric motor. The walls of the ejection chambers are provided with windows connected to the loading hopper. |
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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. |
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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. |
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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. |
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Device comprises turn board articulated with advancing hydraulic jacks, thrust hydraulic jacks with supports in contact with lateral walls of working and frame with boards, their height being defined by drift height. Inclined platform mounted at the frame for turn board and filling material to get in contact with as well as frame boards and filling massif. Thrust hydraulic cylinders are articulated with the frame. Inclined platform is articulated with the device frame at extreme edge in filling material travel direction. At other edge, lift hydraulic cylinders are rigidly secured by cylinders at the frame and, by rods, articulated with the frame. |
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Complete stowage of bottom layer breakage cuts at declining excavation of minerals Proposed method comprises first layer roadway development at 6 degrees to horizon and stowing with stowing mix. After solidification of top layer stowage massif, lower layer road headings and their stowage are performed. In compliance with this invention, after first top layer roadway development, pipeline is laid in roadway soil via which bottom layer cuts are filled. |
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Disposal of potassium concentration wastes Proposed method comprises opening, preparing and working of the section of chambers, preparing of filling mix of potassium dressing wastes and filling of chambers. Working section is opened in drifts from overlying bed. After processing of said section by cleanup chambers, the latter are filled with filling mix with addition of calcium chloride. Filling mix is fed over drifts from overlying bed by gravity. After filling of said chambers, impermeable dams are erected at drift start. Subject to mining and geological conditions, said filling mix can be fed to every chamber or set of chambers via wells drilled from working of overlying bed. Then, wells are plugged. |
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Erection of artificial supports in open areas Proposed method comprises erection of framework and filling it with solid stowing material. Note here that said framework in chamber mined-out space is made of used tires. Said tires are laid in piles from soil to course roof, interconnected and filled with rock. Then, sealing coat is laid on framework over contact with roof to feed solid solution via hole in said coat. After cementation of said solution, said chamber is isolated from adjacent courses by webs and filled with hydraulic fill. |
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Creation of filling massif at development of deposit under permafrost conditions Proposed method comprises construction of drainage dam, erection of pulp duct, feed of backfill pump and drainage of water via drain openings in bulkheads mounted on the side opposite the pulp feed. Drainage pipes in soluble airtight shell are fitted in filled goaf. Cooled compressed air is fed to said pipes at the feed of filling pulp. Note here that dressing tails thickened to pasty state are used as a filling pulp. |
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Method to develop edge ore bodies with unstable ores 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. |
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Method of combined development of steeply-dipping ore bodies 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. |
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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. |
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Method to develop thick steeply-dipping ore bodies Method to develop thick steeply-dipping ore bodies includes division of an ore body into layers developed in descending order, extraction of layers by stopes and filling of the mined space with hardening materials, definition of places of location and dimensions of cavities of cavings above the filling mass, arrangement of stopes as cut to the filling mass, supply of hardening materials along cutting stopes to places for additional filling of cavities of cavings above the filling mass. Before approach of the bottomhole of the cutting stope to the cavity of the caving arranged above the filling mass, arrangement of the cutting stope is stopped, two wells are drilled from the cutting stope towards the upper border of the caving cavity, one of wells is used for supply of hardening material to the cavity of the caving, in the second well they remove air from the caving cavity into the cutting stope, after filling of the caving cavity and achievement of the normative values of strength by the filling material, they continue arrangement of the cutting stope, besides, the minimum permissible distance from the bottomhole of the cutting stope to the cavity of the caving during performance of works for filling of the caving cavity is accepted as more than the depth of the zone of intensive damage of rock massif by the mountain pressure upstream the bottomhole of the cutting stope. |
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Method to determine value of undermining of hardening fill under mechanical damage of ore massif 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. |
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Preparation method of porous hardening mixture for stowing of mined-out underground space 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. |
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Method for construction of stowing barricade in mine working Method for construction of stowing barricade in mine working involves installation of cast slag blocks on each other throughout the section of the stowed mine working. As cast slag blocks there used are rectangular prisms of similar sizes with bases in the form of sharp-cornered isosceles triangles. Stowing barricade is constructed in horizontal layers, in each layer of which there installed are two rows of cast rectangular prisms; besides, prisms of the first row are laid with their smaller side faces to the stowing mass. Equal side faces of prisms of the first and the second rows are laid tightly to each other, and to smaller side faces of prisms of the second row there installed are anchor posts excluding movement of slag blocks under action of stowing mass. |
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Erection method of non-cutting connection strap in drift way made in mountain slope Erection method of a non-cutting connection strap in a drift way made in mountain slope involves drilling of bore pits along the mine working outline, construction of an annular passage, laying into body of connection strap of two pipe lengths for delivery to the annular passage of cement grouting, installation into bore pits of steel rods, supply under pressure to the annular passage and bore pits of cement grouting. Connection strap is erected at some distance from the bore pit mouth, which exceeds distance from sliding surface formed in mounting slope to the bore pit mouth. Bore pits are drilled to the depth that is higher than propagation depth in the area of mine working, area of increased intensity of cracks occurring in massif at driving of mine working. Grouting mortar resistant to corrosive well water is delivered to bore pits, and distance between bore pits is determined on the basis of the following expression: S≤2α, where α - spread depth of grouting mortar to massif in the bore pit area. |
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Method includes erection of a retaining and a filtering link, erection of a pulp line, supply of the filling pulp and water drainage via drain windows in links. Before supply of the filling pump, the design number of drainage pipes are installed in the filled space towards water drainage. At the side of the filtering link, perforated pipes are laid in the filled space with length Lpipe<0.3L, where L - length of the filled space, m, connected via a tight hose to the compressor. After closure of perforated pipes along the length Lpipe, with filling pulp, air is injected into them jointly with supply of the filling pulp to the moment of full flooding of the filled space, afterwards the tight hoses are disconnected from perforated pipes, and perforated pipes are used as drainage ones. |
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Method of hydraulic fill, includes erection of a retaining and a filtering link, erection of a pulp line, supply of the filling pulp and water drainage via drain windows in links. In the filled space drainage pipes are installed in a tight shell, under which they arrange floats connected to each other by means of a flexible connection with a pitch of h, m. The pitch h is taken from the expression h>20D, where D - external diameter of the drainage pipe, m. During supply of filling pulp, compressed air is supplied into drainage pipes, besides, after filling of the filled space floats are withdrawn and used again. |
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Method for development of ore deposits 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%. |
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Composition of filling mixture and method of its production 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. |
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Layered room-and-pillar system with complete stowing Tubing block is exposed over height in two levels. Top level is vent-and-waste floor to release all air from tubing block and to feed stowing mix in breakage heading. Bottom level is haulage level and serves to feed fresh air for mining operations and haulage of all rocks from tubing block to shafts. Spiral descent is made for entire height of tubing block with entries to layer drifts, ore and delivery entries. Divided layer is developed by cul-de-suc miner with pillar width equal to that of cut. Attachment and formation of stowing bulk are made. Breakage cutting is performed by miner transversely to direction of strata and pillars are installed. Heading is vented by local blowers. |
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Method for layered development of kimberlitic pipe with backfilling Each layer is developed with the use of utilised vehicle tyres as a support, note that the layer height is taken not more than tyre height or divisible by its other sizes. Backfilling material is supplied to developed space with mounted tyres. The support from utilised tyres is used as shuttering at backfilling material supply. Note that the tyres are mounted close to each other and isolated from backfilling space by material capable to drain water. |
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Method of working-out backfilling in flooded potassium mine Method of working-out backfilling in flooded potassium mine involves well drilling, preparation of pulp by mixing carrying liquid and solid particles, supply of pulp through wells to flooded working-outs, and backfilling of working-outs. Drilling of injection well and well for liquid pumping-out is performed from day surface to flooded working-out meant for backfilling. Carrying liquid for pulp preparation is taken from flooded backfilled working-out on the level of its soil through the nearest well of the drilled wells. After excess pressure appears on the mouth of the injection well, pulp is supplied continuously; total supply volume of pulp solid particles to the mine through the injection well does not exceed the volume of possible liquid filtration through a sinkhole formed during flooding of potassium mine. |
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Method to increase resistance to gas flow in shaft (versions) Method includes excavation of a material from a bottomhole of an underground mine, using a continuous shearer or a longwall shearer, to develop an empty space and a mined space, supply of a foaming composition into an empty space and into a mined space and reduction of methane content measured in a tailgate at least by 0.1 wt %. Supply of the foaming composition into the empty space and into the mined space is carried out from one of the following: a machine for sight pillars excavation, a part of a continuous shearer, a part of a longwall shearer and a part of a machine for sight pillars excavation. |
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Mining method of thick steep ore bodies Method includes digging of workings for dividing of ore body in blocks, stage extraction of ore by chambers. After dividing of ore body into panels, blocks and chambers, development of chambers is done in staggered order as to ore body rise by the scheme I-III-II-IV as shown in dwg. 1-5. At that bottoms of adjacent chambers I (II) and III (IV) are displaced by one sub-level. Broken ore is transported from the chamber to bottom gangway along delivery crosscut drifted in the middle part of adjacent chamber which is used as drilling crosscut during its development. Development of ore of upper part of chambers is performed between artificial pillars from consolidating stowing mass, and of lower chamber - in ore rock. Coefficient of form Kf=bu/hp size of ore pillar corresponds to the following condition: 0.5<bu/hp<1, where: bu - width of ore pillar and width of undeveloped chamber, m; hp - height of ore pillar or half height of undeveloped chamber, m. |
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Erection method of artificial pedestal-shaped pillars in alluvial wells of permafrost zone All pillar erection operations are performed during winter period after the development of cleaning chamber in alluvial well is completed. A vertical well of large diameter (500-600 mm) is pre-drilled from surface above the developed chamber, under which an underground construction of a moving frame is performed; the above frame is filled with crushed rock mixture formed during summer sand flushing at flushing plants and contained in dumps. Then, mixture is compacted by means of vibration machines and warmed up for a short period of time with its being moistened with superheated steam supplied at high pressure from steam-generating plant in quantity of at least 10 m3 per 1 m of the mixture. After that, frozen rock mixture - pedestal-shaped pillar is frozen in addition with cold air induced with a fan, thus providing high compression properties. |
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Method for underground mining of ore deposits in cryolite zone In the period of negative temperatures of ambient air from dehydrated dressing tails briquettes are pressed of ball shape with two diameters related with the following ratio: and volume of a filling material pressed in the form of briquettes of smaller diameter is determined according to the following formula: where Vvol - total volume of solid wastes supplied for briquetting. All prepared briquettes are frozen on the surface, mixed in hoppers with vibrators, transported and placed in a mined space of cleaning units. The ratio of this space filling with briquettes with identical diameter always makes 0.523. If for filling of the mined space a set of briquettes is used in two different diameters, then the coefficient of filling of the mined space will increase to the value of 0.597. |
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Method for underground mining of sloping and inclined ore bodies in cryolite zone Prior to start of filling works, a recumbent side of a section in a mined space to be filled is poured with water to form an ice crust, afterwards the mined space is filled with crushed dead rocks or frozen briquettes from dressing tails. The ice crust makes it possible to apply self-flow filling at the minimum angle of inclination of a recumbent side equal to αmin.=arctgKfr, where Kfr - coefficient of friction as the filling material moves along the ice crust on the recumbent side of the mined space. |
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Method of sublevel working of steep seams with sandstowing Invention relates to mining, particularly, to sublevel working with sandstowing. Proposed method comprises working the block by odd and even sublevels in ascending order by counter short mining faces vented by all-mine drawdown. First, subdrifts and drops are worked. Seam is worked by counter short mining faces from flank slopes to central slope with direct-flow venting in advance preparation and working of odd sublevels. Mined-out area is filled with solid stowing while even sublevels between odd mined-out sublevels are filled with common stowing. In working, former vent heading is used as a belt heading. |
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Method for determining value of undermining of consolidating stowing mass Method involves formation of cavity in rock mass, burial of fixed rigid bar in it, supply of consolidating stowing mixture to the worked-out area, and measurement of open bar end length; at destruction of rock mass with some part of contact layer of consolidating stowing mass there determined is value of undermining of consolidating stowing as per difference of length of open bar end and length of bar burial in cavity of rock mass. |
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Method for hydraulic transport of stowing pulp into goaf Method includes self-flow supply of a hydraulic stowing pump to filled chambers, its stepwise pumping by pumps without jet break on a mine section of a pulp line, in emergency conditions pulp is released from self-flow and pump sections of the filling pipeline via rupture disks installed at the end of each section of the pulp line, apart from the latter. |
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Flushing pulp is delivered in stages forming several layers between which drain pipes are installed using leakproof hose parallel to longitudinal axis of flushed space. Drain pipes are attached by one end to leakproof hose. Each drain pipe is extended till it reaches opposite dam, then the housing is detached from drain pipe through the opening in filter dam and is removed for further use. When installation of project quantity of drain pipes is completed, process of flushing pulp delivery is resumed. |
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Filling mixture compound contains the following, wt %: water 28.57-44.44 and ashes TPP 4.32-14.32, slag TPP 22.55-42.58, quick high-calcium lime of the first grade 18.92-29.29 or water 28.57-44.44 ground together to maximum grain size 0.16 mm and ashes TPP 5.99-16.13, slag TPP 28.30-47.04, quick high-calcium lime of the first grade 12.99-23.67 ground together to maximum grain size 0.08 mm. |
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Method of slurry backfilling includes preparation of filling mixture from slurry that is generated at production of potassium muriate. Then construction of filling retaining walls, supply of filling mixture into worked out chambers and their filling. Dewatered potassium muriate is added into the slurry as binding agent, the mass of which is defined by the expression: CaCl2-0.57VW, where Vw - water mass in slurry, t. Invention allows leaving solid and liquid part of slurry in solid condition in the filled chamber, the mixture can be transported at large distances that allows performing more complete filling of all slurry in the mine generated at dressing. |
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Composition of stowing mixture, which contains ground granulated blast-furnace slag, inert filler and water, contains the above aged acid slag, and as inert filler there used is washery refuse of wet magnetic separation of ferruginous quartzites, and in addition, the aged ground dolomite powder and superplasticising agent SP-1, at the following component, wt %: the above slag - 11.5; the above refuse - 56.4; the above powder - 9.4; superplasticising agent SP-1 - 0.135; water is the rest. |
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Composition of stowing mixture Composition of stowing mixture contains the following in wt %: ground granular blast-furnace slag 10.20-12.70, sodium hydroxide 1.10-1.35, nickel sludge 0.1-0.5, burnt rock 72.91-75.01, water - the balance. |
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Composition of a fill mixture comprising a ground acid domain pelletised slag, a superplasticiser SP-1, water and wastes of dressing of wet magnet separation of ferruginous quartzites, contained the following mixture as a binder - a mixture of jointly ground stale acid domain pelletised slag, current wastes of dressing of wet magnet separation and a superplasticiser SP-1, at the following ratio of components, wt %: specified slag - 49.8; specified wastes - 49.8; superplasticiser SP-1 - 0.4, and an inert filler - stale wastes of dressing of wet magnetic separation of ferruginous quartzites at the following ratio of components, wt %: binder -22.65; filler - 55.35; water - balance. |
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Underground development method of technogenic deep-lying gravel deposits of permafrost zone Development is performed during winter period. First, vertical through wells with diameter of 0.5-0.6 m are drilled from surface above developed mine field, through which ice-water mixture is supplied; ratio of solid phase to liquid phase is 1:3 by volume. Filling mass is erected layer by layer; at that, each layer is frozen with forced blowing using cold atmospheric air from blowdown fan. Thickness of a single layer |Nlayer| is determined from the following ratio: Nlayer=1.5|tamb.|-20, cm, where: 1.5 and 20 - constant coefficients; |tamb| - absolute monthly average ambient air temperature of months during winter period, °C. |
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Method for hydraulic filling of chambers Method includes supplying pulp under excessive pressure via a safety device. The safety device is arranged as a tee, one end of which is connected to a bottomhole pulp line, the second one - to a sealer, and a safety membrane is installed on the third one. At the same time the output of wells in the backfilled chamber is arranged near its roof. |
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Method of vertical mine backfilling Method includes layer filling of a mine with a backfilling material. The backfilling layer in the form of a cylindrical concrete block is previously made on the surface in an autoclave chamber. Concrete blocks are made with a cylindrical groove, at the same time the upper and lower surfaces are arranged as truncated. Installation of cylindrical concrete blocks in the shaft is carried out onto a hydraulic insulation putty. A gap between mine walls and blocks is solidified with a shrinkage-free water-resistant hardening concrete mix. |
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Method to increase stability of ceiling in downward slicing development of deposit with backfilling Method to increase stability of a ceiling in downward slicing development of a deposit with backfilling includes serial tunnelling and backfilling of parallel mines - stope entries, leaving ore pillars with width equal to one, two or three spans of mines, backfilling of mines with a concrete mix, and after backfilling hardens, ore pillars left between concrete strips are mined. At the same time the vault of stope entries is arranged as deep, besides, ore pillars are left in the roof between concrete backfilling of adjacent stope entries. |
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Stowing mix, containing crushed granulated blast-furnace slag, an inert filler, water and ground limestone, includes the specified acid slag of III grade, containing particles of less than 3 mcm - at least 13%, the specified limestone, containing particles of less than 3 mcm - 45%, the inert filler is represented by rock refuse from wet magnetic separation of ferruginous quartzites and additionally - a superplasticiser SP-1, at the following ratio of components, wt %: specified slag - 12; specified filler - 60; specified limestone - 10; superplasticiser SP-1 - 0.5 of slag content; water - balance. |
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Movable connection strap for creation of filling mass in underground mine workings Device includes metal pressure shield in the form of rectangular parallelepiped consisting of four triangular prisms attached to each other, the bases of which have the shape of oblique right triangle, drain pipes with filters and sampling pipes with plug, door opening with door made in the shield, soft covers arranged on upper and lateral sides of shield, the height of which exceeds distance between shield and mine working section outline at their complete filling with compressed air. At bottom, on the side of filling mass the shield is equipped with rubber-coated canvas. Soft covers installed to lateral sides of shield are arranged on brackets attached throughout the height of connection strap to its side walls. Width of brackets is accepted equal to 2/3 of width of soft covers, and distance between brackets is determined from the following ratio: hmax>a>hmin, where a - distance between brackets, m; hmax - maximum height of soft covers at supply of compressed air to it, m; hmin - minimum height of soft covers after air discharge from it, m. |
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Method involves arrangement of reinforcing elements made in the form of mesh in filling chamber at the boundary with rock ore to be developed. Reinforcing elements are arranged at distance of 0.05b from each other, where b - chamber width. After installation of reinforcing elements the worked out space is filled with filling mass of various strength. Lower, central and upper part of chamber is filled at 1/10 of its height with curing mixture, and space between them with hydraulic fluid from fine material without binding agent. |
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Method for stowing cavities in roof of mining entry ways at development of upper layer with laying Method involves driving of mine workings of the first order at an angle of 5-7° to horizon through pillars with width equal to one bay, their further stowing with stowing mixture and its solidification, driving of entry ways of the second order with their further stowing with stowing mixture. Entry ways of the second order are driven with the height increased in relation to entry ways of the first order by 0.7-1.0 m. Cavities under roof of adjacent entry ways of the first order are filled with stowing mixture of entry ways of the second order, thus providing their stowing and contact of covering mining thickness with stowing mass. |
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Composition of a filling mixture, containing cement, a surfactant, a filler and water, as a binder it additionally contains a ground blast-furnace granulated acidulous slag, containing particles of less than 1 mcm of at least 4.3%, the surfactant is a superplasticiser SP-1, and the filler is a mixture of wastes of dressing of wet magnetic separation of ferric quartzites with slag crushed stone at the following ratio of components, wt %: cement - 4.85; specified slag - 12.1; specified crushed stone - 10; specified wastes - 55; superplasticiser SP-1 - 1.0% from cement; water - balance. |
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Filling mixture compound contains the following, wt %: cement - 4.85, ground byproduct of vanadium production - 14.5, washery refuse of wet magnetic separation of ferruginous quartzites - 60.2, superplastising agent SP-1 - 1 of cement, and water is the rest. |
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Filling mixture compound includes ground granulated acid blast-furnace slag containing particles, %: less than 1 mcm - 4.3; less than 3 mcm - 12.6; less than 5 mcm - 17.2; as inert filler are processing wastes of wet magnetic separation of ferruginous quartzites, which contain particles, %: less than 1 mcm - 3.4; less than 3 mcm - 12.6; less than 5 mcm -17.2, water and in addition - composition of lime-gypsum byproduct of vanadium production and SP-1 superplasticising agent at the following component ratio, wt %: the above slag 16.1, the above composition 4.8, the above wastes 57.7, SP-1 superplasticising agent 0.0805 and water is the rest. |
Another patent 2551218.