CN115010458A - Coal mine underground filling material prepared from metal ore overflow tailings and process and application thereof - Google Patents
Coal mine underground filling material prepared from metal ore overflow tailings and process and application thereof Download PDFInfo
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- CN115010458A CN115010458A CN202210527206.4A CN202210527206A CN115010458A CN 115010458 A CN115010458 A CN 115010458A CN 202210527206 A CN202210527206 A CN 202210527206A CN 115010458 A CN115010458 A CN 115010458A
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- 239000000463 material Substances 0.000 title claims abstract description 73
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 59
- 239000002184 metal Substances 0.000 title claims abstract description 59
- 239000003245 coal Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000008569 process Effects 0.000 title abstract description 11
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- 239000000843 powder Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 18
- 229910052602 gypsum Inorganic materials 0.000 claims description 17
- 239000010440 gypsum Substances 0.000 claims description 17
- 238000005303 weighing Methods 0.000 claims description 12
- 239000011162 core material Substances 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 8
- 239000011707 mineral Substances 0.000 claims description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 229910017053 inorganic salt Inorganic materials 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 229910052604 silicate mineral Inorganic materials 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 3
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 229910001388 sodium aluminate Inorganic materials 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 235000010288 sodium nitrite Nutrition 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 235000011148 calcium chloride Nutrition 0.000 claims description 2
- 239000004570 mortar (masonry) Substances 0.000 claims description 2
- 235000002639 sodium chloride Nutrition 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims 2
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000002910 solid waste Substances 0.000 abstract description 10
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- 238000002360 preparation method Methods 0.000 description 6
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- 238000012360 testing method Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- 229940077388 benzenesulfonate Drugs 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- PHIQPXBZDGYJOG-UHFFFAOYSA-N sodium silicate nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-][Si]([O-])=O PHIQPXBZDGYJOG-UHFFFAOYSA-N 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the technical field of coal mine underground filling, in particular to a coal mine underground filling material prepared from metal mine overflow tailings, and a process and application thereof. The coal mine underground filling material is prepared from the following components in percentage by weight: 5-6% of cementing powder, 27-31% of fly ash, 21-27% of metal ore overflow tailings and 41-42% of water; the metal ore overflow tailings are classified superfine overflow tailings, wherein the content of particles with the particle size of below 400 meshes is more than or equal to 55 percent. The invention utilizes the solid wastes such as overflow tailings and the like produced by regional metal mines to prepare the filling material through reasonable proportioning, and fills the filling material into the underground goaf of the coal mine through a reasonable process, thereby solving the enterprise and social environment problems of tailing solid waste stockpiling.
Description
Technical Field
The invention relates to the technical field of underground coal mine filling, in particular to an underground coal mine filling material prepared from metal ore overflow tailings and a preparation process thereof.
Background
The metal mine overflow tailing solid waste is a brand new enterprise and social subject brought by industry change in two years. In the solid waste tailings after metal mining and mineral separation, classified coarse tailings after general hydraulic cyclone are used for filling aggregates in underground dead zones, and overflow tailings are discharged to a tailing pond. In recent years, with the continuous enhancement of the development concept of tailless mines, urgent capacity of traditional tailing ponds, no hope of newly-built tailing ponds and other factors, mine enterprises innovate a brand-new development idea of 'filling and reserving coarse', traditional filling coarse tailings are sold as building sand raw materials, and original overflow tailings are used as filling aggregates and used for underground filling. But is limited by uncertain factors such as market demand, cementing material filling, underground dead zone scale and the like, and about 5 percent of overflow tailings are still in a surface stockpiling state after coarse tailings are recycled and overflow filling amount in an ideal state.
Coal dominated energy structures will remain difficult to change over a long period of time. In order to effectively liberate the coal pressing resources, filling mining is the most ideal and safest implementation process, and the filling aggregate generally adopts the cheap industrial solid wastes in areas such as fly ash, furnace slag and the like. However, in recent years, with the technical guidance of comprehensive utilization of solid wastes, the traditional fly ash and slag also become precious resources, the price of the water-rising ship in the building material market is high, the early solid wastes are resources, and extremely high filling cost is added to mines lacking gangue aggregates.
In conclusion, in order to solve the problems of no-position stacking of the metal mine superfine overflow tailings and no-material filling in the coal mine goaf, a proper filling cementing material and filling proportion are sought, and the filling cementing material is filled by a reasonable application process, so that the method becomes an important way for building a green tailless mine and helping coal mine enterprises to develop sustainably.
At present, mine filling research on tailings as aggregates is wide, but research on overflow tailings as aggregates is insufficient. Such as
CN1238292C (cementing material for filling paste-like body, slurry preparation filling process), wherein the cementing material is 1-15%, the fine fraction material is 5-50%, the regulator is 0-2%, and the rest is filling aggregate and water. Calcium-containing amorphized and microcrystallized material in the cement: sulfur-containing excitable material: basic excitable material: active material: aggregate of paste-like gelled material: the regulator is (20-93%): (0-40%): (7-50%): (0-50%): (0-10%). However, the overflow tailings in the aggregate only account for 5-30%, the curing strength of the aggregate in 28 days is 1-1.8 Mpa, the strength is low, and the binding material accounts for 10% and is large.
CN113800859A (a special cementing powder for full-tailings cementing filling and a preparation method thereof), which comprises a cementing powder main material and a modifier, wherein the cementing powder main material comprises the following raw materials in percentage by weight: water quenching slag: 55-80%, carbide slag: 5-20%, fluorgypsum: 10% -30%, cement clinker: 5-10% and 5-20% of salt mud. CN106587789 (a novel multifunctional filling material for iron ore full tailings) is mainly prepared from iron ore full tailings, cement and water according to the weight ratio of 57-63%: 10% -15%: 27 to 29 percent, and the like, and the cementing powder or the filling material only performs cementing filling on the whole tailings.
CN113800847A (a goaf filling material made of mine tailings) is composed of 2% -6% of alkyl benzene sulfonate; 5 to 10 percent of fatty alcohol ether sulfate; 2-4% of a foam stabilizer; 4 to 6 percent of coagulant; 10 to 15 percent of Portland cement; 25 to 30 percent of tailings; the balance of water is mixed and stirred evenly at normal temperature and normal pressure and is foamed under high pressure to prepare the foam material. The grain size of the tailing aggregate cemented by the invention is 37-74 μm, namely + 400-200 meshes, and the grain size is larger.
Disclosure of Invention
The invention aims to provide a coal mine underground filling material prepared from metal mine overflow tailings.
The second purpose of the invention is to provide a preparation process of the coal mine underground filling material prepared from the mine overflow tailings.
The third purpose of the invention is to provide the application of the coal mine underground filling material prepared from the metal mine overflow tailings.
In order to solve the technical problem, the application provides the following technical scheme:
a coal mine underground filling material prepared from metal mine overflow tailings is prepared from the following components in percentage by weight: 5-6% of cementing powder, 27-31% of fly ash, 21-27% of metal ore overflow tailings and 41-42% of water; the metal ore overflow tailings are classified superfine overflow tailings, wherein the content of particles with the particle size of below 400 meshes is more than or equal to 55 percent.
The cementing powder is prepared from the following components in percentage by weight: 70-75% of mineral powder, 14-18% of gypsum, 6-10% of cement and 2-5% of core material.
Wherein the specific surface area of the mineral powder is 400-600m 2 /kg。
Wherein the gypsum is one or more of natural gypsum, fluorgypsum or desulfurized gypsum, and the surface area of the gypsum is 300-500 m 2 /kg。
The core material is silicate mineral and inorganic salt, wherein the inorganic salt is one or a combination of sodium chloride, sodium sulfate, calcium chloride, sodium nitrite and sodium aluminate.
Wherein the specific surface area of the fly ash is 400-600m 2 Kg, density 0.961g/cm 3 。
Wherein the content of particles with the particle size of below 400 meshes in the metal ore overflow tailings is not less than 55 percent. According to whether the tailing particles are artificially classified or not, the tailing particles are divided into full tailings and classified tailings, the classification limit is generally 400 meshes, the tailings with the particle size of more than 400 meshes are generally used for filling, and overflow tailings (also called superfine tailings) with the particle size of less than 400 meshes are generally discharged into a tailing warehouse. The tailings used in the invention are overflow tailings which are used as waste for treatment in general mines.
Wherein, the glue sand ratio is 1: 10, wherein the mortar-to-mortar ratio is the weight ratio of the cementing powder to the aggregate, and the aggregate is fly ash and metal ore overflow tailings.
The preparation process of the coal mine underground filling material comprises the following steps:
(1) transporting overflow tailings produced in a metal mine tailing filter pressing workshop to an airing field;
(2) spreading the overflow tailings in a sunning ground by using an excavator, and airing to an air-dried state;
(3) rolling the air-dried overflow tailings to a crushed state by using a loader, and screening to obtain finished product fillable metal ore overflow tailings;
(4) conveying finished product fillable metal ore overflow tailings to a material shed by a loader, shoveling and conveying the finished product fillable metal ore overflow tailings to a hopper, dropping the overflow tailings in the hopper to a measuring hopper, and conveying the measured overflow tailings to a stirrer in a filling workshop through a belt conveyor;
(5) conveying the fly ash to a fly ash silo through a bulk powder tanker for storage, arranging a material level meter in the silo, conveying the fly ash into a fly ash weighing hopper by a screw conveyor at the bottom of the silo, and weighing the fly ash into a stirrer;
(6) the cementing powder is conveyed to a cementing material silo through a bulk powder tank truck for storage, the silo is provided with a material level meter, and a screw conveyor at the bottom of the silo conveys the cementing material into a weighing hopper and then into a stirrer after weighing;
(7) supplying water to a water measuring hopper through a water pump, and conveying the water into a stirrer after measuring;
(8) the metal ore overflow tailings, the fly ash, the cementing powder and the water are fully stirred by an intermittent strong stirrer to prepare paste.
When the coal mine underground filling material prepared from the metal ore overflow tailings is used for filling a goaf under a mine, the concrete method is that the underground goaf is pressurized by a filling pump and then is conveyed to an underground filling area through a filling pipeline for filling.
Compared with the prior art, the coal mine underground filling material prepared from the metal ore overflow tailings and the process and application thereof have at least the following beneficial effects:
the coal mine underground filling material prepared from the metal mine overflow tailings can solve the problems that the coal mine goaf can be filled without materials and the metal mine overflow tailings can not be stockpiled, and helps the resource-depleted mine goaf to become a tailing pond.
The invention utilizes the solid wastes such as the overflow tailings and the like produced by regional metal mines to prepare the filling material through reasonable proportioning, and fills the filling material into the underground goaf of the coal mine through a reasonable process, thereby solving the enterprise and social environment problems of the accumulation of the overflow tailings solid wastes, and further amplifying the product value through the replacement of the slag and fly ash aggregate resources released by the overflow tailings aggregate, thereby reducing the cost and improving the efficiency of coal mine enterprises. Meanwhile, the method provides a low-cost, simple and feasible application case for filling and mining of resource-depleted mines and 'three-down' coal-pressing mines in China.
The coal mine underground filling material prepared from the metal mine overflow tailings and the process and application thereof are further explained with reference to the attached drawings.
Drawings
FIG. 1 is a process flow diagram of the coal mine underground filling of the metal mine overflow tailings of the present invention;
FIG. 2 is the results of the fluidity test for the tailings slurry of example 2.
Detailed Description
Example 1
A coal mine underground filling material prepared from metal mine overflow tailings is prepared by uniformly mixing and stirring the following components in percentage by weight at normal temperature and normal pressure: 5.3% of cementing powder, 26.6% of fly ash, 26.6% of metal ore overflow tailings and 41.5% of water.
In other advantageous embodiments, the composition can be prepared by the following component ratios: 5-6% of cementing powder, 27-31% of fly ash, 21-27% of metal ore overflow tailings and 41-42% of water, and the filling material can be ensured to have good compressive strength under the composition proportion.
The cementing powder is prepared by uniformly mixing and stirring the following components in percentage by weight at normal temperature and pressure: 72% of mineral powder, 16% of gypsum, 8% of cement and 4% of core material. In other beneficial embodiments, the composition can also be prepared by the following component proportions: 70-75% of mineral powder, 14-18% of gypsum, 6-10% of cement and 2-5% of core material.
The specific surface area of the mineral powder is 400-600m 2 /kg。
The gypsum is natural gypsum, and the surface area of the gypsum is 300-500 m 2 In terms of/kg. In other beneficial embodiments, fluorgypsum, desulfurized gypsum or the above-mentioned gypsum can be usedA combination of species.
The core material is sodium silicate nonahydrate and lime according to the weight ratio of 4: 1, and mixing the components in a ratio of 1. In other beneficial embodiments, the core material can be silicate minerals and inorganic salts, wherein the silicate minerals are calcium silicate, sodium silicate and the like, and the inorganic salts are sodium chloride, sodium sulfate and calcium chloride. Sodium nitrite, sodium aluminate or a combination of the above components may also be selected.
The specific surface area of the fly ash is 400-600m 2 Kg, density 0.961g/cm 3 。
Wherein, the rubber-sand ratio of the filling material is 1: 10.
the metal ore overflow tailings are classified superfine overflow tailings, and solid waste overflow tailings produced in a metal mine tailing filter pressing workshop which is located far from Shandong are selected. Wherein the content of the particles with the grain diameter of 400 meshes reaches more than 55 percent.
Tables 1-3 are particle size grading statistics for full tailings, graded coarse tailings, and overflow tailings of three metal mines.
TABLE 1 gold mine A tailings particle size composition test results
TABLE 2 gold mine B tailings grain size composition test results
TABLE 3 gold mine C tailings particle size composition test results
Example 2
Referring to fig. 1, the preparation and application process of the coal mine underground filling material of embodiment 1 includes the following steps:
(1) sampling 300 tons of overflow tailings produced in a metal mine tailing filter pressing workshop, and transporting the overflow tailings to an airing field;
(2) spreading the overflow tailings in a sunning ground, and airing to an air-dried state to ensure that the water content is about 17%;
(3) rolling the air-dried overflow tailings to a crushed state, and screening to obtain finished product fillable metal ore overflow tailings;
(4) conveying finished product fillable metal ore overflow tailings to a material shed by a loader, shoveling and conveying the finished product fillable metal ore overflow tailings to a hopper, dropping the overflow tailings in the hopper to a measuring hopper, and conveying the measured overflow tailings to a stirrer of a filling workshop by a belt conveyor;
(5) conveying the fly ash to a fly ash silo through a bulk powder tanker for storage, arranging a material level meter in the silo, conveying the fly ash into a fly ash weighing hopper by a screw conveyor at the bottom of the silo, and weighing the fly ash into a stirrer;
(6) the cementing powder is conveyed to a cementing material silo through a bulk powder tank truck for storage, the silo is provided with a material level meter, and a screw conveyor at the bottom of the silo conveys the cementing material into a weighing hopper and then into a stirrer after weighing;
(7) supplying water to a water measuring hopper through a water pump, and conveying the water into a stirrer after measuring;
(8) the metal ore overflow tailings, the fly ash, the cementing powder and the water are fully stirred by an intermittent strong stirrer to prepare paste, and the strength of the paste is 1.16MPa after 2 days of indoor test of filling slurry. The pressure is pressurized by a filling pump and then is conveyed to a downhole filling area through a filling pipeline for filling.
The filled downhole face was tested for compressive strength values by core drilling sampling, see table 4 (where the formulation of the cement was the same as in example 1). Wherein, the diffusibility is tested on the prepared filling slurry to examine the fluidity of the filling material.
TABLE 4
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. A coal mine underground filling material prepared from metal ore overflow tailings is characterized in that: the adhesive is prepared from the following components in percentage by weight: 5-6% of cementing powder, 27-31% of fly ash, 21-27% of metal ore overflow tailings and 41-42% of water; the metal ore overflow tailings are classified superfine overflow tailings, wherein the content of particles with the particle size of below 400 meshes is more than or equal to 55 percent.
2. The coal mine underground filling material prepared from the metal mine overflow tailings according to claim 1, wherein the filling material comprises: the cementing powder is prepared from the following components in percentage by weight: 70-75% of mineral powder, 14-18% of gypsum, 6-10% of cement and 2-5% of core material.
3. The coal mine underground filling material prepared from the metal mine overflow tailings according to claim 2, wherein the filling material comprises: the specific surface area of the mineral powder is 400-600m 2 /kg。
4. The coal mine underground filling material prepared from the metal mine overflow tailings according to claim 2, wherein the filling material comprises: the gypsum is one or more of natural gypsum, fluorgypsum or desulfurized gypsum, and the surface area of the gypsum is 300-500 m 2 /kg。
5. The coal mine underground filling material prepared from the metal mine overflow tailings according to claim 2, wherein the filling material comprises: the core material is silicate mineral and inorganic salt, wherein the inorganic salt is one or a combination of more of sodium chloride, sodium sulfate, calcium chloride, sodium nitrite and sodium aluminate.
6. The method of claim 1The coal mine underground filling material prepared from the metal ore overflow tailings is characterized in that: the specific surface area of the fly ash is 400-600m 2 Kg, density 0.961g/cm 3 。
7. The coal mine underground filling material prepared from the metal mine overflow tailings according to claim 1, wherein the filling material comprises: the content of particles with the particle size of below 400 meshes in the metal ore overflow tailings is not less than 55 percent.
8. The coal mine underground filling material prepared from the metal mine overflow tailings according to claim 1, wherein the filling material comprises: the glue-sand ratio is 1: 10, wherein the mortar-to-mortar ratio is the weight ratio of the cementing powder to the aggregate, and the aggregate is fly ash and metal ore overflow tailings.
9. The process for preparing the coal mine underground filling material prepared from the metal ore overflow tailings of any one of claims 1 to 8, which is characterized by comprising the following steps:
(1) transporting overflow tailings produced in a metal mine tailing filter pressing workshop to an airing field;
(2) spreading the overflow tailings in a drying yard, and drying in the sun to an air-dried state;
(3) rolling the air-dried overflow tailings to a crushed state, and screening to obtain finished product fillable metal ore overflow tailings;
(4) conveying finished product fillable metal ore overflow tailings to a material shed, conveying the finished product fillable metal ore overflow tailings to a hopper, dropping the overflow tailings in the hopper to a measuring hopper, and conveying the measured overflow tailings to a stirrer of a filling workshop;
(5) conveying the fly ash to a fly ash silo for storage, arranging a material level meter in the silo, conveying the fly ash to a fly ash weighing hopper by a screw conveyor at the bottom of the silo, and weighing the fly ash and then conveying the fly ash to a stirrer;
(6) conveying the cementing powder to a cementing material silo for storage, arranging a material level meter in the silo, conveying the cementing material to a weighing hopper by a screw conveyor at the bottom of the silo, and weighing the cementing material to a stirrer;
(7) supplying water to a water measuring hopper, measuring and conveying the water to a stirrer;
(8) the metal ore overflow tailings, the fly ash, the cementing powder and the water are fully stirred to prepare paste.
10. The application of the coal mine underground filling material prepared from the metal mine overflow tailings of any one of claims 1 to 8 in filling of mined-out areas in a mine underground is characterized in that: the pressure is pressurized by a filling pump and then is conveyed to a downhole filling area through a filling pipeline for filling.
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Application publication date: 20220906 |