Fill mix

FIELD: mining, particularly to develop valuable mineral deposits along with goaf filling.

SUBSTANCE: fill mix comprises quick lime, grinded blast furnace slag, filler, industrial lignosulphonate and water. The fill mix additionally comprises trisodiumphosphate. All above components are taken in the following amounts (% by weight): quick lime - 1.61-4.8, grinded blast furnace slag - 10.79-14.4, filler - 60.85-62.14, industrial lignosulphonate - 0.016-0.11, trisodiumphosphate - 0.124-0.35, remainder is water.

EFFECT: increased strength and crack-resistance of fill mix over the full fill body.

2 tbl

 

The invention relates to the mining industry and can be used in the development of valuable and average values of mineral deposits with the mined-out space.

Known filling mixture comprising hydrated lime, ground granulated slag, aggregate, and water taken in the following ratio, wt.%:

Quicklime2,85 is 3.8
Ground granulated slag15,23-16,19
The placeholder52,38-57,14
WaterRest

(see ed. St. USSR №173471, E. 21 F 15/00).

At a sufficiently high strength properties of the mixture has a low crack resistance due to the high heat the center of the backfill array (40-70° (C)that causes non-uniform volumetric thermal stresses during curing of the mixture, leading to the appearance of cracks.

The closest analogue to the declared object is filling mixture containing lime, ground granulated blast furnace slag, aggregate, technical lignosulphonate and water taken in the following ratio, wt.%:

Quicklime2,1-7,89
They say the th granulated blast furnace slag 10,52-21,05
The placeholder48,94-63,15
Lignosulfonate technical0,02-0,15
WaterRest

(see Kalmyks V.N., I.S. Beloborodov recommendations for the implementation of hardening cement-free bookmarks in the mines of Uchaly. // Combined Geotechnology: the development of mining methods and mine safety: materials of international scientific-technical conference 2003, Sibay: MSTU - BMSK - BSU, pp.109-111).

The disadvantages of this mixture are low strength and low fracture toughness due to the high temperatures that occur in the center of constructed backfill array, which causes non-uniform volumetric thermal stresses during curing of the mixture, resulting in formation of cracks on the periphery of the array. This is due to the fact that the technical lignosulphonate, increasing absorption of products of hydration, in addition slows down the rate of slaking lime, which further leads to uneven heating of the array from the center to the periphery and increasing cracks.

The technical problem solved by the invention is to simultaneously increase the strength and fracture toughness of filling mixture in the whole volume of backfill array.

The problem is solved in that the known filling with the offer, containing lime, ground granulated blast furnace slag, aggregate, technical lignosulphonate and water, according to the invention further comprises trisodium phosphate in the following ratio, wt.%:

Quicklime1,61-4,8
Ground granulated blast furnace slag10,79 to 14.4
The placeholder60,85-62,14
Lignosulfonate technical0,016-0,11
Trisodium phosphate0,124-0,35
WaterRest

Trisodium phosphate (Na2PO4) according to GOST 201-76*E is a grey kristalicheskie powder, non-hygroscopicity, it is well soluble in water, heated to a temperature of 30-40° (see Manual on the use of chemical additives in the production of precast concrete structures and products (SNiP 3.09-01-85). // NIIZHB. - M.: stroiizdat, 1988, p.31).

It is known the use of trisodium phosphate as an accelerator for the hardening of cement (see Manual on the use of chemical additives in the production of precast concrete structures and products (SNiP 3.09.01-85). // NIIZHB. - M.: stroiizdat, 1988, p.5).

In the inventive filling mixture of trisodium phosphate exhibits the above-mentioned technical the definition property. However, along with the known property of trisodium phosphate in the inventive filling mixture exhibits a complex new technical properties, namely: first, clearing the solubility of lime, thereby reducing the temperature of heating of the mixture throughout the volume of the filling mass, this leads to uniform distribution of volumetric strain in filling the array with the set of strength; secondly, trisodium phosphate in hydration with ground granulated blast furnace slag contributes to a significant increase in the content of ettringite in the filling mixture, which not only activates the components of the mixture, but also speeds up the hardening of the latter; third, trisodium phosphate in the inventive filling mixture reduces the adsorption of the technical lignosulphonate on the hydration products, which contributes to increasing the strength of the interparticle contacts, which also increases the strength and crack resistance of the array. Due to the formation of crystals having a needle-like morphology can be further enhanced reinforcement of the array, resulting in increased strength and crack resistance of the latter.

Based on the above we can conclude that the proposed backfill mixture is not obvious from the prior art, and therefore, meets the condition of patentability "from rettelse level.

Declare stowing mixture is prepared as follows. Previously in a ball mill together crushed to a particle size of 40-70% class - 0,074 mm quicklime, granulated blast furnace slag and aggregate with the addition of trisodium phosphate. In the inventive filling mixture as a filler can be used any ground mineral material, such as ground diabase. Then the mixture is added lignosulfonate technical, pre-dissolved in water. All of the above components of the filling mixture charge in the claimed amount. The resulting mixture is stirred until homogenous and then filling the mixture is ready to use.

To substantiate the advantages of the inventive filling mixture in comparison with the prototype, as well as to substantiate the amount of ingredients in the inventive mixtures in laboratory conditions was prepared and tested six groups filling mixtures: compositions No. 1-3 taken from the declared content of ingredients; composition No. 4 - containing components beyond the minimum value; composition No. 5 - containing ingredients beyond the maximum value; composition No. 6 taken on the prototype. The compositions of filling compounds are listed in table 1.

As a filler was used ground diabase grain size 0-5 mm with the content of the class 0,074 mm 40%.

Table 1
StructuresThe content of the mixture components, wt.%
QuicklimeGround granulated blast furnace slagThe placeholderLignosulfonate technicalTrinacria-phosphateWater
No. 11,6110,7960,850,0160,12426,61
No. 2312,8261,640,030,2122,3
No. 34,814,4062,140,110,3518,2
No. 41,1310,5960,310,0120,02827,93
No. 55,7115,2362,230,120,4816,23
No. 6 prototype4,814,4062,180,04-18,58

For testing were prepared samples of size 10×10×10 see the Temperature of the mixture was measured using a standard thermometer. The samples after curing : rival under a layer of damp sawdust. Test samples No. 1 to 6 on the mechanical strength was carried out by hydraulic pressure through 7, 14, 28, 90 and 180 days, in accordance with GOST 310.4-81. The results are given in table 2.

Table 2
StructuresCharacteristics of the filling mixture
Sample strength in compression (MPa) age, daysSediment cone Building CNIL, cmThe temperature of the mixture (° (C) after mixing, minSample strength at break (MPa) age, days
7142890180103090180
No. 10,72,153,04,23a 4.911,52022190,735
No. 21,02,533,34,715,35122327240,850
No. 31,22,713,415,12to 5.5711,5313733 0,919
No. 40,41,231,672,492,8511,51819180,485
No. 51,22,543,53to 4.685,23103555430,825
No. 6 prototype0,41,752,153,864,3113250450,715

The results of the tests are given in table 2, showed that the proposed backfill mixture (compositions No. 1-3) compared with the filling mixture (composition No. 6), taken as a prototype, is:

- increase of 12.2 and 22.8% of the compressive strength;

- an increase of 2.72-22,19% tensile strength, which confirms the high crack resistance of the backfill array.

In addition, the inventive filling mixtures mobility higher 4,34-8,33%of the mixture taken as a prototype, which leads to nerasseivayushchee components during transportation by pipeline and increase the quality of the backfill array.

The use of backfill mixtures containing components that are outside the claimed range, it is impractical because of low strength and fracture toughness of filling m is Siva (composition No. 4), and also, due to high temperature and a high mobility of the mixture (composition No. 5).

Backfill mixture containing lime, ground granulated blast furnace slag, aggregate, technical lignosulphonate and water, characterized in that it further comprises trisodium phosphate at the following content, wt.%:

Quicklime1,61-4,8
Ground granulated blast furnace slag10,79 to 14.4
The placeholder60,85-62,14
Lignosulfonate technical0,016-0,11
Trisodium phosphate0,124-0,35
WaterRest



 

Same patents:

FIELD: mining industry, particularly underground mineral mining with excavated space filling with hardening filling mix.

SUBSTANCE: method involves mixing grinded lime-containing binding agent, mixing water and filler; delivering the filling mix to area to be filled; filling mine space with the filling mix in several layers. The lime-containing binding agent is active silica-alumina material and burnt carbonate rock including at least 40% of active Cao+MgO. Above rock is grinded so that not more than 15% of grinded material remains on sieve having 0.08 orifice dimensions. Amount of the grinded burnt carbonate rock is selected so that active Cao+MgO is not more than 9.1% of filling mix mass. Water consumption for oxide Ca and Mg conversion in hydroxide is not more than 20% of burnt carbonate rock recalculated to active CaO+MgO. Retarder is added in mixing water in amount determined from R=(0.005-0.021)-Cr/Cw, where R is retarder content in 1 l of mixing water, kg; (0.005-0.021) is factor, which considers retarder-burnt carbonate rock ratio in the filling mix; Cr is burnt carbonate rock content in filling mix, kg; Cw is experimentally determined mixing water content in filling mix, l. Mine space filling rate is chosen from hardening time and self-heating degree of filing mass. The filling mix contains active silica-alumina material in amount of 5.6-33.2% by weight, carbonate rock burnt at 900-1200°C and containing active CaO+MgO of not less than 40% in amount of 1.0-16.7%, mixing water with retarder in amount of 10.6-27.5%, remainder is filler.

EFFECT: increased operational safety due to improved quality mine space filling, reduced costs and increased mine intensity.

6 cl, 4 tbl, 5 dwg

FIELD: mining and underground building, particularly underground mining.

SUBSTANCE: method involves double-stage mineral deposit development; erecting artificial rock-and-concrete supports of previously cut primary chamber roof rock in at least two adjacent primary chambers; extracting secondary chamber resources; filling space defined by cut rock with hardening material mix. Mines for drilling and/or filling operations performing are arranged in deposit roof over or inside ore pillars of secondary chambers. Primary chamber roof rock is cut by well undercharge method. Hardening material mix is supplied via cross headings located between mine and cavities and/or via undercharged well sections remained after rock cutting operation.

EFFECT: increased safety and economical efficiency due to reduced number of drilling and filling mines or accompanying mineral excavation, possibility to use drilling and filling mines at secondary chamber development stage for ore cutting, venting and roof condition control.

5 cl, 3 dwg

FIELD: mining industry.

SUBSTANCE: invention is designed for use in development of minerals with systems involving filling mined-out space with solidifying stowing mix. The latter is composed of broken lime-containing binder in the form of active aluminosilicate material (5.6-33.2%) and fired carbonate rocks (1.0-16.7%), tempering water with phlegmatizer (10.6-27.5%), and filler. Carbonate rocks are fired at 900-1200°C, contain active calcium-magnesium oxides CaO+MgO at least 40% and not more than 9.1% based on the total weight of mix, which are broken to screen residue 0.08 mm not more than 15%. Active aluminosilicate material is fired marl or fired clay, or fired kimberlite ore concentration tails, or granulated blast furnace slag. Tempering water contains phlegmatizer in amounts found from formula [Ph] = (0.005-0.021)*Cr/Cw, where [Ph] amount of water in 1 L tempering water, kg; (0.005-0.021) coefficient taking into account proportion between phlegmatizer and fired carbonate rocks in mix; Cr amount of carbonate rocks in mix, kg; and Cw experimentally found consumption of tempering water with mix, L. When indicated amount of CaO+MgO in mixture is exceeded, CaO and MgO are converted into hydroxides by spraying with water in amount not higher than 20% of the weight of fired carbonate rocks (on conversion to active CaO+MgO). As carbonate rocks, host rocks of kimberlite deposits are used; as filler, sand and/or concentration tails, and/or broken aluminosilicate rock; and, as phlegmatizer, industrial-grade lignosulfonate or superplasticizer.

EFFECT: improved workability of mix and reduced cost.

5 cl, 4 dwg, 3 tbl

Backfill mix // 2270921

FIELD: mining industry, particularly to develop mineral deposit along with backfilling of worked-out areas.

SUBSTANCE: backfill mix comprises cement, grinded granulated blastfurnace slag, filler and water. The backfill mix additionally has shredded straw. Grinded diabase is used as the filler. All above components are taken in the following amounts (% by weight): cement - 2.9-5.07, grinded granulated blastfurnace slag - 15.21-16.91, grinded diabase - 52.24-53.22, shredded straw - 0.02-0.076, water - remainder.

EFFECT: increased strength and crack-resistance.

2 tbl

FIELD: mining industry.

SUBSTANCE: device has surface composed of upper section with wedges and lower section and backfill material placed on said surface. Upper section is made in form of a rectangle, composed of rectangular triangle and rectangular trapezoid with possible displacement of trapezoid along triangle hypotenuse. Lower section is made of two plates, mounted on holder, fixed to pipe for feeding compressed air. Plate, positioned above the trapezoid, is mounted with possible counter-clockwise rotation around holder. Value of greater base of trapezoid hδ is selected from relation hδ = m - 0.9k, where m - bed massiveness, m, k - size of backfill material, m.

EFFECT: simplified construction, lower laboriousness.

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FIELD: mining industry.

SUBSTANCE: method includes extraction of deposit resources by chambers through one of them, construction of ice-rock backfill in extracted space of primary chambers and following extraction of inter-chamber blocks. In inter-chamber blocks wedge-shaped slits are formed immediately in ceiling of deposit, space of slits is filled with ice-rock backfill, while slits are formed of inter-chamber blocks for 1/3 of width.

EFFECT: higher durability, higher effectiveness.

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FIELD: mining industry.

SUBSTANCE: method includes preparation and well extraction of resources of chambers with partial backfill of extraction space. Blocks of upper level relatively to blocks of lower level are placed in staggered order, while blocks are made in form of a stretched upwards hexahedron. Resources of block within one hexahedron are separated on two chambers, one of which, placed along periphery of hexahedron, after extraction and removal of ore from it is filled by hardening backfill. Second order chamber is made of hexahedron-like shape, extracted and removed under protection from artificial block on all six sides of this chamber. Removal of ore from first order chambers is performed through one removal mine - end of level ort and cross-cut in lower portion of block and intermediate sub-level cross-cuts.

EFFECT: higher efficiency.

2 dwg

FIELD: mining industry.

SUBSTANCE: method includes erection of rows of main platforms along bed length in staggered order with length equal or divisible by step value for support displacement, and placing filling material thereon. Along length of main platforms between ceiling and bed soil post support is mounted, upon which filling material is fed. After that between main platforms additional platforms are erected with wedge supporting, and main platforms are rotated counter-clockwise towards pneumatic support and it is displaced for one drive step. During that filling material, while lowering, unwedges wedge support between ceiling and bed soil and forms artificial supports. After that additional platforms are rotated counter-clockwise towards pneumatic support. After movement of cleaning face for two drive steps operations for constructing artificial supports are repeated. Distance between main platforms along bed fall line are selected from mathematical expression.

EFFECT: higher efficiency.

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FIELD: mining industry.

SUBSTANCE: method includes partial filling of extracted space of side and central mains by filling stripes from lava extracting shafts. At center of semi-lava on the side of massive, wherein next extractive column will be cut, filling shaft is additionally driven, wherefrom full filling of space between central fill stripe and fill stripe on the side of massive is performed. Preparation of next extraction column is performed under protection of erected fill stripes.

EFFECT: higher safety, higher efficiency.

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The invention relates to the field of mining industry and can be used to eliminate voids in underground development ore bodies

FIELD: mining industry.

SUBSTANCE: method includes partial filling of extracted space of side and central mains by filling stripes from lava extracting shafts. At center of semi-lava on the side of massive, wherein next extractive column will be cut, filling shaft is additionally driven, wherefrom full filling of space between central fill stripe and fill stripe on the side of massive is performed. Preparation of next extraction column is performed under protection of erected fill stripes.

EFFECT: higher safety, higher efficiency.

1 dwg

FIELD: mining industry.

SUBSTANCE: method includes erection of rows of main platforms along bed length in staggered order with length equal or divisible by step value for support displacement, and placing filling material thereon. Along length of main platforms between ceiling and bed soil post support is mounted, upon which filling material is fed. After that between main platforms additional platforms are erected with wedge supporting, and main platforms are rotated counter-clockwise towards pneumatic support and it is displaced for one drive step. During that filling material, while lowering, unwedges wedge support between ceiling and bed soil and forms artificial supports. After that additional platforms are rotated counter-clockwise towards pneumatic support. After movement of cleaning face for two drive steps operations for constructing artificial supports are repeated. Distance between main platforms along bed fall line are selected from mathematical expression.

EFFECT: higher efficiency.

2 dwg

FIELD: mining industry.

SUBSTANCE: method includes preparation and well extraction of resources of chambers with partial backfill of extraction space. Blocks of upper level relatively to blocks of lower level are placed in staggered order, while blocks are made in form of a stretched upwards hexahedron. Resources of block within one hexahedron are separated on two chambers, one of which, placed along periphery of hexahedron, after extraction and removal of ore from it is filled by hardening backfill. Second order chamber is made of hexahedron-like shape, extracted and removed under protection from artificial block on all six sides of this chamber. Removal of ore from first order chambers is performed through one removal mine - end of level ort and cross-cut in lower portion of block and intermediate sub-level cross-cuts.

EFFECT: higher efficiency.

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FIELD: mining industry.

SUBSTANCE: method includes extraction of deposit resources by chambers through one of them, construction of ice-rock backfill in extracted space of primary chambers and following extraction of inter-chamber blocks. In inter-chamber blocks wedge-shaped slits are formed immediately in ceiling of deposit, space of slits is filled with ice-rock backfill, while slits are formed of inter-chamber blocks for 1/3 of width.

EFFECT: higher durability, higher effectiveness.

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FIELD: mining industry.

SUBSTANCE: device has surface composed of upper section with wedges and lower section and backfill material placed on said surface. Upper section is made in form of a rectangle, composed of rectangular triangle and rectangular trapezoid with possible displacement of trapezoid along triangle hypotenuse. Lower section is made of two plates, mounted on holder, fixed to pipe for feeding compressed air. Plate, positioned above the trapezoid, is mounted with possible counter-clockwise rotation around holder. Value of greater base of trapezoid hδ is selected from relation hδ = m - 0.9k, where m - bed massiveness, m, k - size of backfill material, m.

EFFECT: simplified construction, lower laboriousness.

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Backfill mix // 2270921

FIELD: mining industry, particularly to develop mineral deposit along with backfilling of worked-out areas.

SUBSTANCE: backfill mix comprises cement, grinded granulated blastfurnace slag, filler and water. The backfill mix additionally has shredded straw. Grinded diabase is used as the filler. All above components are taken in the following amounts (% by weight): cement - 2.9-5.07, grinded granulated blastfurnace slag - 15.21-16.91, grinded diabase - 52.24-53.22, shredded straw - 0.02-0.076, water - remainder.

EFFECT: increased strength and crack-resistance.

2 tbl

FIELD: mining industry.

SUBSTANCE: invention is designed for use in development of minerals with systems involving filling mined-out space with solidifying stowing mix. The latter is composed of broken lime-containing binder in the form of active aluminosilicate material (5.6-33.2%) and fired carbonate rocks (1.0-16.7%), tempering water with phlegmatizer (10.6-27.5%), and filler. Carbonate rocks are fired at 900-1200°C, contain active calcium-magnesium oxides CaO+MgO at least 40% and not more than 9.1% based on the total weight of mix, which are broken to screen residue 0.08 mm not more than 15%. Active aluminosilicate material is fired marl or fired clay, or fired kimberlite ore concentration tails, or granulated blast furnace slag. Tempering water contains phlegmatizer in amounts found from formula [Ph] = (0.005-0.021)*Cr/Cw, where [Ph] amount of water in 1 L tempering water, kg; (0.005-0.021) coefficient taking into account proportion between phlegmatizer and fired carbonate rocks in mix; Cr amount of carbonate rocks in mix, kg; and Cw experimentally found consumption of tempering water with mix, L. When indicated amount of CaO+MgO in mixture is exceeded, CaO and MgO are converted into hydroxides by spraying with water in amount not higher than 20% of the weight of fired carbonate rocks (on conversion to active CaO+MgO). As carbonate rocks, host rocks of kimberlite deposits are used; as filler, sand and/or concentration tails, and/or broken aluminosilicate rock; and, as phlegmatizer, industrial-grade lignosulfonate or superplasticizer.

EFFECT: improved workability of mix and reduced cost.

5 cl, 4 dwg, 3 tbl

FIELD: mining and underground building, particularly underground mining.

SUBSTANCE: method involves double-stage mineral deposit development; erecting artificial rock-and-concrete supports of previously cut primary chamber roof rock in at least two adjacent primary chambers; extracting secondary chamber resources; filling space defined by cut rock with hardening material mix. Mines for drilling and/or filling operations performing are arranged in deposit roof over or inside ore pillars of secondary chambers. Primary chamber roof rock is cut by well undercharge method. Hardening material mix is supplied via cross headings located between mine and cavities and/or via undercharged well sections remained after rock cutting operation.

EFFECT: increased safety and economical efficiency due to reduced number of drilling and filling mines or accompanying mineral excavation, possibility to use drilling and filling mines at secondary chamber development stage for ore cutting, venting and roof condition control.

5 cl, 3 dwg

FIELD: mining industry, particularly underground mineral mining with excavated space filling with hardening filling mix.

SUBSTANCE: method involves mixing grinded lime-containing binding agent, mixing water and filler; delivering the filling mix to area to be filled; filling mine space with the filling mix in several layers. The lime-containing binding agent is active silica-alumina material and burnt carbonate rock including at least 40% of active Cao+MgO. Above rock is grinded so that not more than 15% of grinded material remains on sieve having 0.08 orifice dimensions. Amount of the grinded burnt carbonate rock is selected so that active Cao+MgO is not more than 9.1% of filling mix mass. Water consumption for oxide Ca and Mg conversion in hydroxide is not more than 20% of burnt carbonate rock recalculated to active CaO+MgO. Retarder is added in mixing water in amount determined from R=(0.005-0.021)-Cr/Cw, where R is retarder content in 1 l of mixing water, kg; (0.005-0.021) is factor, which considers retarder-burnt carbonate rock ratio in the filling mix; Cr is burnt carbonate rock content in filling mix, kg; Cw is experimentally determined mixing water content in filling mix, l. Mine space filling rate is chosen from hardening time and self-heating degree of filing mass. The filling mix contains active silica-alumina material in amount of 5.6-33.2% by weight, carbonate rock burnt at 900-1200°C and containing active CaO+MgO of not less than 40% in amount of 1.0-16.7%, mixing water with retarder in amount of 10.6-27.5%, remainder is filler.

EFFECT: increased operational safety due to improved quality mine space filling, reduced costs and increased mine intensity.

6 cl, 4 tbl, 5 dwg

Fill mix // 2282724

FIELD: mining, particularly to develop valuable mineral deposits along with goaf filling.

SUBSTANCE: fill mix comprises quick lime, grinded blast furnace slag, filler, industrial lignosulphonate and water. The fill mix additionally comprises trisodiumphosphate. All above components are taken in the following amounts (% by weight): quick lime - 1.61-4.8, grinded blast furnace slag - 10.79-14.4, filler - 60.85-62.14, industrial lignosulphonate - 0.016-0.11, trisodiumphosphate - 0.124-0.35, remainder is water.

EFFECT: increased strength and crack-resistance of fill mix over the full fill body.

2 tbl

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