CN103319123B - Fly ash-based cemented filling material and preparation method thereof - Google Patents
Fly ash-based cemented filling material and preparation method thereof Download PDFInfo
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- CN103319123B CN103319123B CN201310284360.4A CN201310284360A CN103319123B CN 103319123 B CN103319123 B CN 103319123B CN 201310284360 A CN201310284360 A CN 201310284360A CN 103319123 B CN103319123 B CN 103319123B
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Abstract
The invention discloses a fly ash-based cemented filling material and a preparation method thereof, belongs to the field of filling mining, and particularly relates to a filling material for mining and a preparation method thereof. The fly ash-based cemented filling material is used for solving the problems of high cost and slow solidification and consequent low roof contact rate of the existing cement filling material for mining. The filling material is prepared from waste fly ash, underground wastewater, an activator, lime, desulfurized gypsum, an early strength agent, sulphoaluminate cement and complex portland cement. The preparation method comprises the following steps of: (I) preparing raw materials; (II) pouring the underground wastewater into a stirring device, adding the waste fly ash, and adding the activator for activation treatment; (III) adding the lime, gypsum, complex portland cement, early strength agent and sulphoaluminate cement into the activated mortar, and stirring to obtain the filling slurry. According to the fly ash-based cemented filling material and the preparation method thereof disclosed by the invention, the cost of each ton of filling material is 80-115 yuan, the 8-hour uniaxial compressive strength is 1-2MPa, the 28-day uniaxial compressive strength is stabilized at 4-10MPa, and the roof contact rate can exceed 95%.
Description
Technical field
The invention belongs to mining with stowing field, be specifically related to a kind of mining compaction material and preparation method thereof.
Background technology
Total tailing cemented filling material, red mud cemented filling material etc. is had at present at the main cemented filling material of China's application, these cemented filling materials generally adopt silicate cement as jointing compound, in use there is the shortcomings such as slip solidifies slowly, early strength is low.The eighties in 20th century, novel High-water quick consolidated filling materials was succeeded in developing in China Mining University, this material is divided into A to expect and B material, A material is made up of aluminate or aluminosulfate cement sintered material, suspension agent, retardant and dispersion agent, B material forms by without water anhydrite, lime and compound rapid hardening, hardening accelerator and suspension dispersive agent, during use, two kinds of material are stirred into slip respectively, then make filling slurry with after two Pipeline transports to fill area by mixing tank respectively.The advantages such as this compaction material has rapid hardening through practice, and morning is strong.But also there is following problem in actual applications:
1, the cost of compaction material is higher, causes filling cost to remain high.Reach 850 yuan/ton according to the price of actual count high-water material, as transport to the outlying mining areas such as mining area, Heilungkiang then material cost reach 1000 yuan/ton, every filling 1m
3material cost is 400 yuan, and high cost limits promoting the use of of this kind of compaction material.
2, filling process more complicated.For preventing condensation of materials excessive velocities, cause pipeline jam accident, material divides two kinds of slurries to carry separately, therefore need the separate filling system of two covers to work simultaneously, tissue and allotment are difficult to accomplish careful control, have impact on filling effect, also can strengthen cost of investment further.
3, compaction material stability is poor.When Filling density reaches 68%-70%, water cement ratio is when 2-2.5, although this material can by whole water consolidations, but wherein only have partial crystallization water, also have a large amount of planar water, the existence of planar water makes material mechanical property under external conditions impact change, and affects filling effect.
So reducing compaction material cost is the problem that high water solidifying backfill the most urgently solves.China is based on thermal power generation, but the flyash average utilization about 40% of discharging, accumulate more than 1,000,000,000 tons, larger pollution is caused to environment, and China's most of fly ash in electric power plant I, II level ash only accounts for about 5%, and mix III level ash or wait outer grey product early strength on the low side, limit its widespread use.If carry out activation treatment to rudimentary flyash, greatly self-value will be improved.If the discarded part or all of cement of rudimentary coal ash instead is used for consolidated fill in consolidated fill, the difficult problem that in placement operation, cement expense is high will be solved, there is good economic benefit.
Summary of the invention
The object of the invention is to solve existing mining cemented filling material cost higher and solidify to cause more slowly and connect the low problem of top rate, and fly ash base cemented filling material and preparation method thereof is provided.
Fly ash base cemented filling material of the present invention is made up of 450 ~ 485 parts of rejected fly ashes, 705 ~ 725 parts of down-hole waste water, 15 ~ 20 parts of activators, 4 ~ 6 parts of lime, 32 ~ 40 parts of desulfurated plasters, 11 ~ 14 parts of hardening accelerator, 90 ~ 112 parts of aluminosulfate cements and 128 ~ 148 parts of composite Portland cements by mass fraction;
Wherein said activator is one or more mixtures in desulfurated plaster, alum, water glass, white lime;
Described hardening accelerator is Na
2cO
3, NaNO
2, Na
2sO
4, Li
2cO
3, Li
2sO
4, one or more mixtures in trolamine.
The preparation method of fly ash base cemented filling material of the present invention follows these steps to realize:
One, 450 ~ 485 parts of rejected fly ashes, 705 ~ 725 parts of down-hole waste water, 15 ~ 20 parts of activators, 4 ~ 6 parts of lime, 32 ~ 40 parts of desulfurated plasters, 11 ~ 14 parts of hardening accelerator, 90 ~ 112 parts of aluminosulfate cements and 128 ~ 148 parts of composite Portland cements are prepared as raw material by mass fraction;
Two, down-hole waste water step one prepared is injected in whipping appts, then adds rejected fly ash and stirs, then adds activator and carry out activation treatment, obtains activating mortar;
Three, in activation mortar, add lime, gypsum, composite Portland cement, hardening accelerator and aluminosulfate cement that step one is prepared, stir 10 ~ 15min and obtain fly ash base consolidated fill slurry;
Activator wherein described in step one is one or more mixtures in desulfurated plaster, alum, water glass, white lime;
Described hardening accelerator is Na
2cO
3, NaNO
2, Na
2sO
4, Li
2cO
3, Li
2sO
4, one or more mixtures in trolamine.
The fly ash base cemented filling material proportion obtained by preparation method of the present invention is 1.4t/m
3, water-solid ratio is 0.8 ~ 1.
Fly ash base cemented filling material of the present invention is with low cost, compaction material per ton is 80 yuan ~ 115 yuan, filling effect is good, 8h uniaxial compressive strength is 1MPa ~ 2MPa, within 28 days, uniaxial compressive strength is stabilized in 4MPa ~ 10MPa, and early strong intensity is high, and later strength increases significantly, connect top rate and can reach more than 95%, can effectively can control upper overlying strata through field practice and move.
Adopt Sin-gle pipeline transport system during coal ash base cemented filling material filling simultaneously, convenient operation, reduce early investment.The raw materials used energy a large amount of rejected fly ash of digestion and down-hole waste water, be beneficial to environment protection.Owing to containing a large amount of flyash in compaction material, constantly carry out along with increasing pulverized burned coal ash hydration the length of time, hydrated product is on the increase, and makes compaction material internal structure more even, closely knit, both add the later strength of compaction material, in turn enhance the carbonization resistance of compaction material.
Embodiment
Embodiment one: present embodiment fly ash base cemented filling material is made up of 450 ~ 485 parts of rejected fly ashes, 705 ~ 725 parts of down-hole waste water, 15 ~ 20 parts of activators, 4 ~ 6 parts of lime, 32 ~ 40 parts of desulfurated plasters, 11 ~ 14 parts of hardening accelerator, 90 ~ 112 parts of aluminosulfate cements and 128 ~ 148 parts of composite Portland cements by mass fraction;
Wherein said activator is one or more mixtures in desulfurated plaster, alum, water glass, white lime;
Described hardening accelerator is Na
2cO
3, NaNO
2, Na
2sO
4, Li
2cO
3, Li
2sO
4, one or more mixtures in trolamine.
When present embodiment activator and hardening accelerator are mixture, each composition part can be mixed by any ratio.
Present embodiment is activated flyash by activator, and the flyash after activation and appropriate composite Portland cement energy Substitute For Partial aluminosulfate cement, reduce compaction material cost.And the silicate gelling that a large amount of flyash after activation produce along with aquation is on the increase, and makes compaction material microtexture more closely knit, adds crushing resistance and the weather resistance of compaction material.
Embodiment two: present embodiment and embodiment one are less than or equal to 45% unlike flyash 45 μm of square hole sieve screen over-sizes.Other raw material is identical with embodiment one.
Present embodiment rejected fly ash used, for waiting outer dry row or wet-discharged coal ash, is low calcium ash.
Embodiment three: present embodiment and embodiment one or two are 5 ~ 14 unlike the pH value of down-hole waste water, and in waste water, solid impurity particle diameter is not more than 2cm.Other raw material is identical with embodiment one or two.
Present embodiment down-hole waste water used is the underground coal mine water or metallic ore mine water that cannot directly utilize.
Embodiment four: one of present embodiment and embodiment one to three are unlike Al in aluminosulfate cement
2o
3mass percentage be greater than 28%.Other raw material is identical with one of embodiment one to three.
Embodiment five: present embodiment and embodiment one are unlike working as SiO in rejected fly ash
2mass percentage when being greater than 58%, activator is made up of the desulfurated plaster of 90% and the alum of 10% by mass percentage, hardening accelerator by mass percentage by 99.75% Na
2cO
3with 0.25% NaNO
2composition.Other raw material is identical with embodiment one.
Embodiment six: present embodiment and embodiment one are unlike working as SiO in rejected fly ash
2mass percentage when being 50% ~ 58%, activator is white lime, hardening accelerator by mass percentage by 40% Na
2cO
3with 60% Na
2sO
4composition.Other raw material is identical with embodiment one.
Embodiment seven: present embodiment and embodiment one are unlike working as SiO in rejected fly ash
2mass percentage when being 48% ~ 50%, activator is made up of the white lime of 95% and the water glass of 5% by mass percentage, hardening accelerator by mass percentage by 99% Na
2sO
4with 1% Li
2cO
3composition.Other raw material is identical with embodiment one.
Embodiment eight: present embodiment and embodiment one are unlike working as SiO in rejected fly ash
2mass percentage when being 45% ~ 48%, activator by mass percentage by the white lime of 35%, the desulfurated plaster of 63% and 2% alum form, hardening accelerator by mass percentage by 99% Na
2sO
4, 0.67% Li
2cO
3form with the trolamine of 0.33%.Other raw material is identical with embodiment one.
Embodiment nine: present embodiment and embodiment one are unlike working as SiO in rejected fly ash
2mass percentage when being less than 45%, activator by mass percentage by 34% white lime, the water glass of 1.5%, the desulfurated plaster of 63% and 1.5% alum form, hardening accelerator by mass percentage by 98.8% Na
2sO
4, 0.72% Li
2cO
3, the trolamine of 0.24% and the Li of 0.24%
2sO
4composition.Other raw material is identical with embodiment one.
Embodiment ten: the preparation method of present embodiment fly ash base cemented filling material follows these steps to realize:
One, 450 ~ 485 parts of rejected fly ashes, 705 ~ 725 parts of down-hole waste water, 15 ~ 20 parts of activators, 4 ~ 6 parts of lime, 32 ~ 40 parts of desulfurated plasters, 11 ~ 14 parts of hardening accelerator, 90 ~ 112 parts of aluminosulfate cements and 128 ~ 148 parts of composite Portland cements are prepared as raw material by mass fraction;
Two, down-hole waste water step one prepared is injected in whipping appts, then adds rejected fly ash and stirs, then adds activator and carry out activation treatment, obtains activating mortar;
Three, in activation mortar, add lime, gypsum, composite Portland cement, hardening accelerator and aluminosulfate cement that step one is prepared, stir 10 ~ 15min and obtain fly ash base consolidated fill slurry;
Activator wherein described in step one is one or more mixtures in desulfurated plaster, alum, water glass, white lime;
Described hardening accelerator is Na
2cO
3, NaNO
2, Na
2sO
4, Li
2cO
3, Li
2sO
4, one or more mixtures in trolamine.
Embodiment 11: present embodiment and embodiment ten are unlike when the mass percentage of rejected fly ash is greater than 48%, it is be 17 DEG C ~ 45 DEG C in temperature that step 2 adds process that activator carries out activation treatment, and humidity is display in the environment of 80% ~ 95% to carry out activation treatment in 2 ~ 30 hours.Other step and parameter identical with embodiment ten.
Present embodiment is displaying period every 1 hour with the speed of 20r/min stirring 15min.
Embodiment 12: present embodiment and embodiment ten are unlike when the mass percentage of rejected fly ash is less than 48%, contain water glass or white lime in activator simultaneously, then step 2 adds the process that activator carries out activation treatment is first add water glass in activator or white lime, it is 17 DEG C ~ 45 DEG C in temperature, humidity is display 4 ~ 8 hours in the environment of 80% ~ 95%, and then other composition added in activator, be 17 DEG C ~ 45 DEG C in temperature, humidity is continue in the environment of 80% ~ 95% to display to carry out activation treatment in 1 ~ 2 hour.Other step and parameter identical with embodiment ten.
Present embodiment is displaying period every 1 hour with the speed of 20r/min stirring 15min.
Embodiment one: the preparation method of the present embodiment fly ash base cemented filling material follows these steps to implement:
One, 485 parts of rejected fly ashes, 724 parts of down-hole waste water, 19 parts of activators, 6 parts of lime, 38 parts of desulfurated plasters, 12 parts of hardening accelerator, 100 parts of aluminosulfate cements and 128 parts of composite Portland cements are prepared as raw material by mass fraction;
Two, down-hole waste water step one prepared is injected in whipping appts, then adds rejected fly ash and stirs, then to stir control temperature after 10min be 20 DEG C to adding activator mix, and humidity is 80%, displays within 2 hours, to carry out activation treatment and obtain activating mortar;
Three, in activation mortar, add lime, gypsum, composite Portland cement, hardening accelerator and aluminosulfate cement that step one is prepared, stir 10min and obtain fly ash base consolidated fill slurry;
SiO in rejected fly ash wherein described in step one
2mass percentage be 60%, activator is made up of the desulfurated plaster of 90% and the alum of 10% by mass percentage, hardening accelerator by mass percentage by 93.75% Na
2cO
3with 6.25% NaNO
2composition.Down-hole waste water used is the underground coal mine water that cannot directly utilize.
Step 2 is displaying period every 1 hour stirring 15min, and the rotating speed of stirring is 20r/min.The rotating speed that step 3 stirs is 20r/min.
The fly ash base binding backfill slurry obtained by the present embodiment, by Pulp pump and 600 mitron roads, is pumped to after coal-face in goaf filling bag, for the goaf filling of coal mine industrial and mineral.Compaction material good fluidity, not stratified segregation, presetting period 90min, final setting time 120min, does not shrink after final set substantially, and 8h uniaxial compressive strength is 1MPa, and within 28 days, uniaxial compressive strength stabilizes to 5MPa, connects top rate and reaches 95%.
Embodiment two: the preparation method of the present embodiment fly ash base cemented filling material follows these steps to implement:
One, 460 parts of rejected fly ashes, 705 parts of down-hole waste water, 15 parts of activators, 5 parts of lime, 32 parts of desulfurated plasters, 13 parts of hardening accelerator, 100 parts of aluminosulfate cements and 135 parts of composite Portland cements are prepared as raw material by mass fraction;
Two, down-hole waste water step one prepared is injected in whipping appts, then adds rejected fly ash and stirs, then to stir control temperature after 10min be 17 DEG C to adding activator mix, and humidity is 89%, displays within 4 hours, to carry out activation treatment and obtain activating mortar;
Three, in activation mortar, add lime, gypsum, composite Portland cement, hardening accelerator and aluminosulfate cement that step one is prepared, stir 10min and obtain fly ash base consolidated fill slurry;
SiO in rejected fly ash wherein described in step one
2mass percentage be 53%, activator is white lime, hardening accelerator by mass percentage by 40% Na
2cO
3with 60% Na
2sO
4composition.Down-hole waste water used is the underground coal mine water that cannot directly utilize.
Step 2 is displaying period every 1 hour stirring 15min, and the rotating speed of stirring is 20r/min.The rotating speed that step 3 stirs is 20r/min.
The fly ash base cemented filling material obtained by the present embodiment is pumped to by lane, for gob-side entry retaining filling by slush pump and 150 mitron roads.Compaction material workability is good, presetting period 60min, and final setting time 90min, constantly increases with age strength after final set, and 8h uniaxial compressive strength is 1.5MPa, and within 28 days, uniaxial compressive strength is stabilized in 7MPa.Effectively control roof weighting, stay lane Be very effective.
Embodiment three: the preparation method of the present embodiment fly ash base cemented filling material follows these steps to implement:
One, 465 parts of rejected fly ashes, 712 parts of down-hole waste water, 16 parts of activators, 4 parts of lime, 36 parts of desulfurated plasters, 12 parts of hardening accelerator, 96 parts of aluminosulfate cements and 130 parts of composite Portland cements are prepared as raw material by mass fraction;
Two, down-hole waste water step one prepared is injected in whipping appts, then add rejected fly ash to stir, adding after the white lime mix and blend 10min in activator in temperature is 20 DEG C again, humidity is display 4 hours in the environment of 80%, add the desulfurated plaster in activator and alum again, be 20 DEG C in temperature, humidity is display in the environment of 80% to carry out activation treatment in 4 hours, obtains activating mortar;
Three, in activation mortar, add lime, gypsum, composite Portland cement, hardening accelerator and aluminosulfate cement that step one is prepared, stir 10min and obtain fly ash base consolidated fill slurry;
SiO in rejected fly ash wherein described in step one
2mass percentage be 49%, activator by mass percentage by the white lime of 35%, the desulfurated plaster of 63% and 2% alum form, hardening accelerator by mass percentage by 99% Na
2sO
4with 1% Li
2cO
3composition.Down-hole waste water used is the underground coal mine water that cannot directly utilize.
Step 2 is displaying period every 1 hour stirring 15min, and the rotating speed of stirring is 20r/min.The rotating speed that step 3 stirs is 20r/min.
Compaction material, by Pulp pump and 1200 mitron roads, is pumped between hydromining coal-face coal column by the fly ash base cemented filling material obtained by the present embodiment, for coal mine industrial and mineral house column type hydraulic coal mining filling.Slip presetting period 150min, final setting time 170min, compaction material is longer for time of coagulation, and the operating time is abundant, and 8h uniaxial compressive strength is 1.1MPa, and within 28 days, uniaxial compressive strength is stabilized in 6.5MPa, connects top rate and reaches 99%.
Embodiment four: the preparation method of the present embodiment fly ash base cemented filling material follows these steps to implement:
One, 467 parts of rejected fly ashes, 711 parts of down-hole waste water, 19 parts of activators, 4 parts of lime, 36 parts of desulfurated plasters, 12 parts of hardening accelerator, 100 parts of aluminosulfate cements and 134 parts of composite Portland cements are prepared as raw material by mass fraction;
Two, down-hole waste water step one prepared is injected in whipping appts, then add rejected fly ash to stir, adding after the white lime mix and blend 10min in activator in temperature is 22 DEG C again, humidity is display 5 hours in the environment of 87%, add the desulfurated plaster in activator and alum again, be 22 DEG C in temperature, humidity is display in the environment of 87% to carry out activation treatment in 1 hour, obtains activating mortar;
Three, in activation mortar, add lime, gypsum, composite Portland cement, hardening accelerator and aluminosulfate cement that step one is prepared, stir 10min and obtain fly ash base consolidated fill slurry;
SiO in rejected fly ash wherein described in step one
2mass percentage be 46%, activator by mass percentage by the white lime of 35%, the desulfurated plaster of 63% and 2% alum form, hardening accelerator by mass percentage by 99% Na
2sO
4, 0.67% Li
2cO
3form with the trolamine of 0.33%.Down-hole waste water used is the underground coal mine water that cannot directly utilize.
Step 2 is displaying period every 1 hour stirring 15min, and the rotating speed of stirring is 20r/min.The rotating speed that step 3 stirs is 20r/min.
Compaction material, by concrete pressure pump and 100 mitron roads, is pumped in the filling bag installed along working face by the fly ash base cemented filling material obtained by the present embodiment, for the operation of iron ore mining with stowing.Slip presetting period 90min, final setting time 110min, compaction material is shorter for time of coagulation, and early strength is higher, and 8h uniaxial compressive strength is 1.6MPa, and 28 days uniaxial compressive strengths are stabilized in 8MPa and connect top rate and reach 96%.
Embodiment five: the preparation method of the present embodiment fly ash base cemented filling material follows these steps to implement:
One, 472 parts of rejected fly ashes, 723 parts of down-hole waste water, 18 parts of activators, 6 parts of lime, 38 parts of desulfurated plasters, 12 parts of hardening accelerator, 96 parts of aluminosulfate cements and 129 parts of composite Portland cements are prepared as raw material by mass fraction;
Two, down-hole waste water step one prepared is injected in whipping appts, then add rejected fly ash to stir, adding after the white lime mix and blend 10min in activator in temperature is 22 DEG C again, humidity is display 5 hours in the environment of 87%, add the desulfurated plaster in activator, alum and water glass again, be 22 DEG C in temperature, humidity is display in the environment of 87% to carry out activation treatment in 1.5 hours, obtains activating mortar;
Three, in activation mortar, add lime, gypsum, composite Portland cement, hardening accelerator and aluminosulfate cement that step one is prepared, stir 10min and obtain fly ash base consolidated fill slurry;
SiO in rejected fly ash wherein described in step one
2mass percentage be 40%, activator by mass percentage by 34% white lime, the water glass of 1.5%, the desulfurated plaster of 63% and 1.5% alum form, hardening accelerator by mass percentage by 98.8% Na
2sO
4, 0.72% Li
2cO
3, the trolamine of 0.24% and the Li of 0.24%
2sO
4composition.Down-hole waste water used is the underground coal mine water that cannot directly utilize.
Step 2 is displaying period every 1 hour stirring 15min, and the rotating speed of stirring is 20r/min.The rotating speed that step 3 stirs is 20r/min.
Compaction material, by concrete pressure pump and 300 mitron roads, is pumped in fire dam, as stopping composition by the fly ash base cemented filling material obtained by the present embodiment.Slip presetting period 115min, final setting time 140min, 8h uniaxial compressive strength is 1.1MPa, and within 28 days, uniaxial compressive strength is stabilized in 5MPa, and resisting carbonization is strong, can effectively isolate obnoxious flavour and mine water.
Claims (5)
1. fly ash base cemented filling material, is characterized in that fly ash base cemented filling material is made up of 450 ~ 485 parts of rejected fly ashes, 705 ~ 725 parts of down-hole waste water, 15 ~ 20 parts of activators, 4 ~ 6 parts of lime, 32 ~ 40 parts of desulfurated plasters, 11 ~ 14 parts of hardening accelerator, 90 ~ 112 parts of aluminosulfate cements and 128 ~ 148 parts of composite Portland cements by mass fraction;
Wherein said activator is one or more mixtures in desulfurated plaster, alum, water glass, white lime;
Described hardening accelerator is Na
2cO
3, NaNO
2, Na
2sO
4, Li
2cO
3, Li
2sO
4, one or more mixtures in trolamine;
As SiO in rejected fly ash
2when content is greater than 58%, activator is made up of the desulfurated plaster of 90% and the alum of 10% by mass percentage, hardening accelerator by mass percentage by 99.75% Na
2cO
3with 0.25% NaNO
2composition;
As SiO in rejected fly ash
2content when being 50% ~ 58%, activator is white lime, hardening accelerator by mass percentage by 40% Na
2cO
3with 60% Na
2sO
4composition;
As SiO in rejected fly ash
2when content is 48% ~ 50%, activator is made up of the white lime of 95% and the water glass of 5% by mass percentage, hardening accelerator by mass percentage by 99% Na
2sO
4with 1% Li
2cO
3composition;
As SiO in rejected fly ash
2content when being 45% ~ 48%, activator by mass percentage by the white lime of 35%, the desulfurated plaster of 63% and 2% alum form, hardening accelerator by mass percentage by 99% Na
2sO
4, 0.67% Li
2cO
3form with the trolamine of 0.33%;
As SiO in flyash
2mass percentage when being less than 45%, activator by mass percentage by 34% white lime, the water glass of 1.5%, the desulfurated plaster of 63% and 1.5% alum form, hardening accelerator by mass percentage by 98.8% Na
2sO
4, 0.72% Li
2cO
3, the trolamine of 0.24% and the Li of 0.24%
2sO
4composition.
2. fly ash base cemented filling material according to claim 1, is characterized in that Al in aluminosulfate cement
2o
3mass percentage be greater than 28%.
3. prepare the preparation method of fly ash base cemented filling material as claimed in claim 1, it is characterized in that the preparation method of fly ash base cemented filling material follows these steps to realize:
One, 450 ~ 485 parts of rejected fly ashes, 705 ~ 725 parts of down-hole waste water, 15 ~ 20 parts of activators, 4 ~ 6 parts of lime, 32 ~ 40 parts of desulfurated plasters, 11 ~ 14 parts of hardening accelerator, 90 ~ 112 parts of aluminosulfate cements and 128 ~ 148 parts of composite Portland cements are prepared as raw material by mass fraction;
Two, down-hole waste water step one prepared is injected in whipping appts, then adds rejected fly ash and stirs, then adds activator and carry out activation treatment, obtains activating mortar;
Three, in activation mortar, add lime, gypsum, composite Portland cement, hardening accelerator and aluminosulfate cement that step one is prepared, stir 10 ~ 15min and obtain fly ash base consolidated fill slurry;
Activator wherein described in step one is one or more mixtures in desulfurated plaster, alum, water glass, white lime;
Described hardening accelerator is Na
2cO
3, NaNO
2, Na
2sO
4, Li
2cO
3, Li
2sO
4, one or more mixtures in trolamine.
4. the preparation method of fly ash base cemented filling material according to claim 3, is characterized in that as SiO in rejected fly ash
2when content is greater than 48%, it is be 17 DEG C ~ 45 DEG C in temperature that step 2 adds process that activator carries out activation treatment, and humidity is display in the environment of 80% ~ 95% to carry out activation treatment in 2 ~ 30 hours.
5. the preparation method of fly ash base cemented filling material according to claim 3, is characterized in that as SiO in rejected fly ash
2when content is less than 48%, contain water glass or white lime in activator simultaneously, then step 2 adds the process that activator carries out activation treatment is first add water glass in activator or white lime, it is 17 DEG C ~ 45 DEG C in temperature, humidity is display 4 ~ 8 hours in the environment of 80% ~ 95%, and then other composition added in activator, be 17 DEG C ~ 45 DEG C in temperature, humidity is continue in the environment of 80% ~ 95% to display to carry out activation treatment in 1 ~ 2 hour.
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| CN103936344A (en) * | 2014-01-24 | 2014-07-23 | 天地科技股份有限公司 | Loess fly ash-based coal mine filling material, and filling method thereof |
| CN105523747A (en) * | 2016-01-27 | 2016-04-27 | 济南大学 | Mine filling cementing material and preparation method thereof |
| CN107417228A (en) * | 2017-04-26 | 2017-12-01 | 四川大学 | A kind of high water conservation flyash high-water material of novel high-strength |
| CN109400080B (en) * | 2018-07-27 | 2021-02-19 | 中国矿业大学 | Inorganic solidified fly ash filling material and preparation method thereof |
| CN110255857B (en) * | 2019-05-28 | 2021-12-14 | 路德环境科技股份有限公司 | Low-alkali conditioner for deep dehydration of building slurry and dehydration method |
| CN112431631A (en) * | 2020-12-03 | 2021-03-02 | 安徽理工大学 | Coal-based solid waste-based goaf controllable paste filling method |
| CN113187540B (en) * | 2021-04-28 | 2023-05-02 | 华电宁夏灵武发电有限公司 | Backfilling method for abandoned mine roadway |
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