CN103936344A - Loess fly ash-based coal mine filling material, and filling method thereof - Google Patents
Loess fly ash-based coal mine filling material, and filling method thereof Download PDFInfo
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- CN103936344A CN103936344A CN201410035688.7A CN201410035688A CN103936344A CN 103936344 A CN103936344 A CN 103936344A CN 201410035688 A CN201410035688 A CN 201410035688A CN 103936344 A CN103936344 A CN 103936344A
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- loess
- fly ash
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- flyash
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- 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
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Abstract
The invention discloses a loess fly ash-based coal mine filling material, and a filling method thereof. The loess fly ash-based coal mine filling material comprises water, a main material, an auxiliary material, and an additive; the main material is composed of loess and fly ash; the auxiliary material is composed of cement, quicklime, and gypsum; mass ratio of loess to fly ash ranges from 1:1.5 to 1:3; the mass of auxiliary material accounts for 30 to 33% of the mass of the loess fly ash-based coal mine filling material; and the mass of the additive accounts for 5 to 7% of that of the loess fly ash-based coal mine filling material. According to the loess fly ash-based coal mine filling material, loess is used for replacing a part of fly ash in traditional filling materials, so that cost is reduced as far as possible with ensured filling material performance.
Description
Technical field
The present invention relates to coal mine gob filling material technology field, particularly a kind of coal mine filling material and fill method thereof of loess fly ash base.
Background technology
Along with the development of filling in mine technology, compaction material and technique are developed in the process of constantly transformation and innovation, experienced several stages such as hydraulic sand filling, lower concentration consolidated fill, highly concentrated cemented fill, pumping paste filling, the Gao Shui fixed filling of (superelevation water) material and other type materials (like lotion) gravity flow conveyings, coal mine gob filling mainly adopts pumping paste filling and like lotion (Gao Shui) flow automatically two kinds of compaction materials of filling and technique at present.
Traditional lotion and high water filling material are larger to the demand of flyash, relatively less at flyash, filling mining is implemented in the mining area, northwest that price is higher, the flyash of higher volume causes compaction material high expensive, affect the economic technology benefit of filling mining, restricted the popularization of filling mining technology.
Summary of the invention
The object of the invention is to provide a kind of coal mine filling material and fill method thereof of loess fly ash base.
For achieving the above object, the present invention adopts technical scheme to be:
A coal mine filling material for loess fly ash base, the solid material of compaction material is major ingredient, auxiliary material and admixture; Wherein major ingredient is loess and flyash, and auxiliary material is cement, unslaked lime and gypsum; Wherein, loess with flyash quality than 1:1.5～1:3; Auxiliary material accounts for 30%～33% of compaction material quality, and external additive accounts for 5%～7% of compaction material quality.
A coal mine filling material for loess fly ash base, compaction material is made up of water and solid material, Gu the mass concentration of material is 60～75%.Gu material comprises major ingredient, auxiliary material and admixture; Wherein major ingredient is loess and flyash, and auxiliary material is cement, unslaked lime and gypsum; Wherein, loess with flyash quality than 1:1.5～1:3; Auxiliary material accounts for 30%～33% of compaction material quality, and external additive accounts for 5%～7% of compaction material quality.
Described admixture is one or more in water glass (water glass), Sodium sulfate anhydrous.min(99) (sodium sulfate) and calcium chloride.
Described compaction material is expected admittedly for major ingredient, auxiliary material and admixture; Wherein major ingredient is loess and flyash, and auxiliary material is cement, unslaked lime and gypsum;
Wherein, loess is with flyash quality than being 1:2, and auxiliary material accounts for 30% of compaction material quality, and external additive accounts for 6% of compaction material quality, and loess powder and flyash major ingredient mass concentration are 60%.
A fill method for the coal mine filling material of loess fly ash base, is uniformly mixed into uniform slip by described casting resin according to aforementioned proportion, makes filling slurry mass concentration 60～65%, is transported to the scope of operation fills by gravity flow or pump pressure mode of movement.
Described casting resin is mixed according to aforementioned proportion, make casting resin pulp quality concentration 60%, carry or the mode of special filling pumping is transported to working face through filling pipeline and fills by gravity flow.
After described slurrying filling, intensity length of time is 14～28 days.
After described slurrying filling, intensity length of time is 28 days.
After auxiliary material mixes with soil in filling slurry of the present invention, with the moisture in soil, chemical reaction occurs immediately, each component of auxiliary material starts to dissolve and produce complicated physics, chemical transformation.Along with the carrying out of reaction, form the slurry of certain viscosifying power, and setting and harden becomes the gelling material with some strength, these react all taking aquation as prerequisite.Basic clinker mineral in auxiliary material is C
3s, C
2s, C
3a, C
4aF, CaO, main intensity contributor is C
3s and C
2s, the reaction formula of its hydration mechanism is as follows: 3CaO ﹒ SiO
2+ nH
2o → xCaO ﹒ SiO
2﹒ yH
2o+ (3-x) Ca (OH)
2(1), 2CaO ﹒ SiO
2+ mH
2o → xCaO ﹒ SiO
2﹒
yh
2o+ (2-x) Ca (OH)
2(2) in formula: x=CaO/SiO
2, in auxiliary material, self hydration reaction of cement is early stage process, it makes soil-cement body have early stage intensity, and the interaction of auxiliary material and soil, flyash is depended in the long-term raising of the continuation of obturator performance.Its action mode can be summarized as: the setting and harden of ion-exchange and group's granulation, cement, carbonation and hard solidifying four aspects such as react.
From the reaction mechanism of hydrated cementitious, C
3the aquation of A is at Ca (OH)
2in the environment existing, carry out, one of feature in hardening of cement process is, Ca (OH)
2in liquid phase, for a long time in isothermal state of saturation, and in fact in long time built-in system, fixedly contain free lime.It is stable that the hydrolysis product of cements such as hydrated calcium silicate only could keep in the environment of saturated lime solution.Otherwise they will be hydrolyzed, and isolate free CaO in solution, until the concentration of lime solution is elevated to while being enough to make its stable existence.When lime being joined while going in solution, lower low alkalinity hydrated calcium silicate, drated calcium aluminate and the hydrated calcium ferrite of intensity just together with lime in conjunction with generating higher high alkalinity hydrated calcium silicate, drated calcium aluminate and the hydrated calcium ferrite of intensity.
The present invention has advantages of:
The present invention is directed to the feature of coal mine gob filling, adopt taking loess, flyash as major ingredient, new type filling material taking cement, lime basic material as auxiliary material, replace the part flyash in traditional compaction material with loess, meeting under the prerequisite of compaction material performance, reduce to greatest extent compaction material cost.
Brief description of the drawings
Fig. 1 is the test specimen pressure break aspect graph of the embodiment of the present invention.
Fig. 2 is that the feed liquid mass concentration of the embodiment of the present invention is on the trend map that affects of result.
Fig. 3 be the embodiment of the present invention loess coal ash quality comparison result affect trend map.
Fig. 4 is that the auxiliary material addition of the embodiment of the present invention is on the trend map that affects of result.
Fig. 5 is that the external additive of the embodiment of the present invention is on the trend map that affects of result.
Fig. 6 is that the maintenance number of days of the embodiment of the present invention is on the trend map that affects of result.
Embodiment
Embodiment 1
Slip is raw-material to be chosen and the leading indicator of compaction material:
Test water is Lintong District, Xi'an domestic water, no suspended substance, and colorless and odorless, conforms with test requirements document.
Loess is Lintong District, Xi'an Malan loess (Q
3), light yellow, sieve through 0.5mm testing sieve, 105 DEG C of oven dry.
Flyash is the II level flyash that Xi'an Ba Qiao heat power plant produces.Cement is local mine, Lintong board P.O32.5# ordinary Portland cement, and its physics, chemical investigation result meet national standard (2007).
Lime is the calcareous lime of Cao villages and small towns, Fuping, Shaanxi Hua Tai building materials limited liability company.
Admixture is commercially available chemical reagent, is mainly salt bases exciting agent.
Wherein loess and flyash are referred to as major ingredient, and cement, unslaked lime and gypsum are referred to as auxiliary material, and major ingredient, auxiliary material and admixture are collectively referred to as solid material.
(1) plan design
The requirement to compaction material according to the character of compaction material and filling process, first utilize orthogonality principle arrangement test, the present invention tests 5 kinds of factors of main consideration, be pulp quality concentration (Gu material accounts for the mass ratio of gross weight) (X1), in major ingredient loess with flyash quality than (native gray scale X2), auxiliary material and solid mass ratio of expecting (auxiliary material adds X3), admixture and solid mass ratio (admixture addition X4) of expecting, obturator curing time (X5), selected index is: denseness (s)/slump (mm) (degree of mobilization), just final setting time (h), calculus rate (%), each uniaxial compressive strength in the length of time (MPa), concrete influence factor and horizontally as shown in table 1:
Table 1 experimental factor and water-glass
Test is five factor four levels, selects orthogonal table L16 (4
5) arrange to test.Specific experiment method is as follows:
The flowing property of slip adopts cement slurry texturometer and slump instrument to record; Test specimen adopts cube standard test block that 7.07cm × 7.07cm × 7.07cm is made in three mortar resistance to compression die trials, and after final set, form removal, with reference to down-hole reducing environment, is placed on maintenance in the water of 20 ± 5 DEG C of constant temperature; First, the final setting time of slip adopts new standard method Vicat apparatus to record; Slip calculus rate utilizes steel ruler to record (actual calculus height and standard specimen height 7.07cm ratio); Calculus body uniaxial compressive strength adopts microcomputer controlled electro minor universal testing machine to survey respectively the uniaxial compressive strength after its maintenance 3d, 7d, 14d and 28d, and every group of 3 test blocks, get its mean value (referring to table 2).
(2) uniaxial compression test
According to the slip of test design scheme preparation, measure its physical properties, with reference to down-hole reducing environment, be placed in the water of 20 ± 5 DEG C of constant temperature respectively after maintenance 3d, 7d, 14d and 28d, adopt microcomputer controlled electro minor universal testing machine to survey respectively the uniaxial compressive strength of difference test specimen in the length of time, every group of 3 test blocks, get its mean value, and process of the test and result are as shown in Fig. 1, table 2.
Table 2 slip physical properties and uniaxial compression test result table
Test the impact of each factor on calculus body uniaxial compressive strength
In each index of filling slurry, the intensity of calculus body is an of paramount importance index, and therefore this test, using uniaxial compressive strength as evaluation result, utilizes orthogonal experiments analytical procedure to judge respectively each factor and the impact of level on result.Test result analysis table is as shown in table 3.
Table 3 test result analysis table
Each factor is 23.01 on the extreme difference R:X1 of result impact as can be seen from the table, X2 is 15.431, X3 is 13.895, X4 is that 15.098, X5 is 14.648, and concentration having the greatest impact to result is described, take factor as the leading factor, the extreme difference difference of all the other factors is little, illustrates that each factor significance level is suitable, in engineering practice, all should pay attention on an equal basis.In table, can find more intuitively more excellent proportioning, concentration is 74%, and lime cement is with loess than being 1:5, and lime is 0 with cement ratio, and curing time is 14d.But the not necessarily optimal proportion of more excellent proportioning intuitively obtaining, therefore can make the trend map of each factor on result impact, to find more excellent proportioning.According to table 3, the result sum of utilizing a level to cause, the trend map of result impact is as 3-7.
From table 2 and table 3, the bleeding rate of each group test all can reach requirement, and in the time that other conditions are basically identical, along with the raising of pulp density, slip mobility is poorer, and concrete castability is lower; External additive content is higher, just, final setting time is shorter; Maintenance number of days is longer, and consolidating strength is higher.
From Fig. 3-6, calculus body ultimate compression strength, along with pulp density raises and raises, illustrates that pulp density is larger, and consolidating strength is higher.Increase with loess with flyash quality ratio, the ultimate compression strength of calculus body is the trend of first increases and then decreases, in the time that being 1:2, native gray scale reaches higher value, the lower value tending towards stability again after native gray scale is greater than 1:1, there is a preferably scope in the ratio that loess and flyash are described, lime-soil ratio is between 1:1.5～1:3.Along with the increase that auxiliary material accounts for solid material mass ratio, calculus body ultimate compression strength is the downward trend again that rises afterwards that first declines, and in the time that auxiliary material accounts for solid material 25% left and right, reaches minimum value, reaches maximum value in the time of 32% left and right.In the time that auxiliary material ratio is less than 20%, make major ingredient ratio relatively large, when consolidating strength relative 25%, increase, but consider the effect that the impact on slurry gel of cement in auxiliary material and lime improve later strength, should be selected between 30%～33% therefore optimize region.Along with the increase that external additive accounts for solid material mass ratio, the resistance to compression of calculus body and intensity are the trend that first declines and rise afterwards, in the time that external additive accounts for solid material 8% left and right, reach minimum value, reach higher value in 4% left and right.In addition, when external additive ratio is greater than 8%, test specimen intensity increases, but consider accelerating chemicals in additive on the impact of gel time with and engineering cost, the optimized proportion of additive should be between 5%～7%.The ultimate compression strength of test specimen is the trend of increase with the increase of curing time, intensity improves rapidly in 14d preserving period, and it is relatively slow that after maintenance 14d, test specimen intensity improves speed, and preserving period tends towards stability after being greater than 28d gradually.
Embodiment 2
Requirement according to engineering reality to compaction material characteristic, lists separately No. 2, No. 4, No. 8, No. 9 test proportionings in table 2 in table 4.Wherein No. 2 and No. 4 proportionings can meet the requirement of gravity flow delivery technology to compaction material, the delivery technology that wherein flows automatically can carry out in a conventional manner, or undertaken by following operation: first in centrotheca tank, inject quantitative water, after starting stirring transmission mechanism, start to inject flyash, inject while stirring flyash, make centrotheca; Then centrotheca, auxiliary material, loess are inputted to pulping tank according to setting proportioning simultaneously, powerful, quick, mixing from top to bottom under the effect of agitator, the continuously online slurrying of output while stirring; Slip is through flow control, filtration, pipeline transport system, and by gravitional force, gravity flow is transported to filling unit; Filling slurry is from the ejection gravity flow of the conveying mouth of pipe, and from bottom to top, from the close-by examples to those far off, by rare retrogradation, support country rock is enriched in worked-out section by liquid to solid.
No. 8 and No. 9 proportionings can meet the requirement of pump pressure delivery technology to compaction material, wherein pump pressure delivery technology can carry out in a conventional manner, or undertaken by following operation: the filling of loess powder coal ash sill is a kind of consolidated fill technology, that loess, flyash, auxiliary material etc. in above-described embodiment are mixed with water, stirring and processing become there is good stability, mobility and plastic slip, under pump function, be transported to worked-out section with the form of plug flow and complete placement operation, the process of playing a supporting role after solidifying.Adopt which to be filled with following outstanding advantage: (1) obturator rate of compression is low, has independence and certain supporting capacity.Compaction material is coagulability material, solidifies the obturator of rear formation some strength, is a kind of oversaturated compact structures.Obturator rate of compression only has 1～3%, much smaller than the loose rate of compression of carrying compaction material; (2) filling slurry pipeline operation efficiency is high.Compaction material adopts pipeline to carry, and transport pipe takes up space little, can adapt to easily turn round, descending and upward slope, and water wherein forms the organic component of obturator, does not need to secrete at filling operation face, and pipeline transported substance is substantially all utilized.
The test mix proportion scheme that table 4 meets the demands
In sum, the requirement according to filling process to compaction material, filling slurry should possess following characteristics: the slip degree of mobilization that meets gravity flow delivery technology should be no more than 14 seconds, and the slip slump that meets pump pressure conveying should be not less than 200mm; The fixed standing bleeding rate of slip is no more than 5%.One slip just, final setting time require slip existing enough can pump time or can flowing time, solidify in time self-support after arriving again filling operation face, as under condition the presetting period of slip should be greater than 2.5 hours, final setting time is within 1～2 day.The ultimate compression strength of slip calculus body depends on mining geologic condition and coal mining work: under general requirement laboratory standard curing condition, 8-10 hour intensity is not less than 0.1Mpa, and within 28 days, intensity is not less than 1.5Mpa.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (7)
1. a coal mine filling material for loess fly ash base, is characterized in that: compaction material is made up of water and solid material, Gu the mass concentration of material is 60～75%.Gu material comprises major ingredient, auxiliary material and admixture; Wherein major ingredient is loess and flyash, and auxiliary material is cement, unslaked lime and gypsum; Wherein, loess with flyash quality than 1:1.5～1:3; Auxiliary material accounts for 30%～33% of compaction material quality, and external additive accounts for 5%～7% of compaction material quality.
2. the coal mine filling material of loess fly ash base according to claim 1, is characterized in that: described admixture is one or more in water glass (water glass), Sodium sulfate anhydrous.min(99) (sodium sulfate) and calcium chloride.
3. the coal mine filling material of loess fly ash base according to claim 1, is characterized in that: described compaction material is expected admittedly for major ingredient, auxiliary material and admixture; Wherein major ingredient is loess and flyash, and auxiliary material is cement, unslaked lime and gypsum;
Wherein, loess is with flyash quality than being 1:2, and auxiliary material accounts for 30% of compaction material quality, and external additive accounts for 6% of compaction material quality, and loess powder and flyash major ingredient mass concentration are 60%.
4. the fill method of the coal mine filling material of a loess fly ash base claimed in claim 1, it is characterized in that: described casting resin is uniformly mixed into uniform slip according to aforementioned proportion, make filling slurry mass concentration 60～65%, be transported to the scope of operation by gravity flow or pump pressure mode of movement and fill.
5. the fill method of the coal mine filling material of loess fly ash base according to claim 4, it is characterized in that: described casting resin is mixed according to aforementioned proportion, make casting resin pulp quality concentration 60%, carry or the mode of special filling pumping is transported to working face through filling pipeline and fills by gravity flow.
6. the fill method of the coal mine filling material of loess fly ash base according to claim 4, is characterized in that: after described slurrying filling, intensity length of time is 14～28 days.
7. the fill method of the coal mine filling material of loess fly ash base according to claim 6, is characterized in that: after described slurrying filling, intensity length of time is 28 days.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106517940A (en) * | 2016-11-04 | 2017-03-22 | 大同煤矿集团有限责任公司 | Contiguous seam efficient filling material |
| CN106746810A (en) * | 2017-01-06 | 2017-05-31 | 哈尔滨工业大学深圳研究生院 | A kind of loess cured polymer material and preparation method thereof |
| CN107973570A (en) * | 2017-11-27 | 2018-05-01 | 河北煤炭科学研究院 | A kind of loess solid filling material and its preparation and application |
| CN110342891A (en) * | 2019-08-01 | 2019-10-18 | 西安科技大学 | A kind of spoil paste filling material and preparation method thereof for coal mining |
| CN111592308A (en) * | 2020-06-11 | 2020-08-28 | 陕西拉发纪新材料科技有限公司 | Waste coal mine filler based on fly ash |
| CN114149233A (en) * | 2021-12-07 | 2022-03-08 | 国网新源控股有限公司 | Environment-friendly improved soil and preparation method thereof |
| CN115432981A (en) * | 2022-07-12 | 2022-12-06 | 淮阴工学院 | Method for preparing gangue-based cemented filling material from alkali residue-solid waste concrete |
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Cited By (7)
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| CN106517940A (en) * | 2016-11-04 | 2017-03-22 | 大同煤矿集团有限责任公司 | Contiguous seam efficient filling material |
| CN106746810A (en) * | 2017-01-06 | 2017-05-31 | 哈尔滨工业大学深圳研究生院 | A kind of loess cured polymer material and preparation method thereof |
| CN107973570A (en) * | 2017-11-27 | 2018-05-01 | 河北煤炭科学研究院 | A kind of loess solid filling material and its preparation and application |
| CN110342891A (en) * | 2019-08-01 | 2019-10-18 | 西安科技大学 | A kind of spoil paste filling material and preparation method thereof for coal mining |
| CN111592308A (en) * | 2020-06-11 | 2020-08-28 | 陕西拉发纪新材料科技有限公司 | Waste coal mine filler based on fly ash |
| CN114149233A (en) * | 2021-12-07 | 2022-03-08 | 国网新源控股有限公司 | Environment-friendly improved soil and preparation method thereof |
| CN115432981A (en) * | 2022-07-12 | 2022-12-06 | 淮阴工学院 | Method for preparing gangue-based cemented filling material from alkali residue-solid waste concrete |
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