CN113061011B - Manufacturing method of red mud-modified phosphogypsum mine filling material - Google Patents
Manufacturing method of red mud-modified phosphogypsum mine filling material Download PDFInfo
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- CN113061011B CN113061011B CN202110420712.9A CN202110420712A CN113061011B CN 113061011 B CN113061011 B CN 113061011B CN 202110420712 A CN202110420712 A CN 202110420712A CN 113061011 B CN113061011 B CN 113061011B
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
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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
- 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
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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
- 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
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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
- 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
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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
Abstract
The invention discloses red mud-modified phosphogypsum mine filling material which is prepared from the following raw materials, by weight, 60-90 parts of Bayer process red mud, 10-30 parts of modified phosphogypsum and 0.10-10 parts of composite additive. The preparation method of the red mud-modified phosphogypsum mine filling material comprises the following steps: the red mud is scattered and crushed to be less than 3mm for standby; premixing a composite additive, modified phosphogypsum and scattered and crushed red mud to obtain a solid mixture; mixing water and the solid mixture and stirring the mixture strongly to obtain filling paste slurry; and conveying the filling paste slurry to the mine for filling and curing to obtain the mine filling material. The prepared mine filling material has good stability, strong plasticity and good fluidity. The filling material solves the problem that the structural damage is invalid due to the later alkali return when common silicate cement and red mud are mixed. And the mining filling cost of the mine is reduced, and the harmless, large-scale and resource utilization of two solid wastes of red mud and phosphogypsum is realized.
Description
Technical Field
The invention relates to the technical field of ecological filling in mining industry, in particular to a method for manufacturing red mud-modified phosphogypsum mine filling.
Background
Red mud (Red mud or Bauxite residue) is a solid waste produced in the process of producing alumina from Bauxite. Red mud is classified into bayer process red mud and sintering process red mud according to different production processes. Except for a small amount of enterprises which adopt a sintering method to produce alumina for chemical use, most of the enterprises in China adopt a Bayer method to produce alumina with the quality for electrolytic aluminum, and the produced red mud is also called Bayer method red mud, has high alkali content and great comprehensive utilization difficulty. Typically about 1.0 to 2.0 tons of red mud are produced per 1 ton of alumina produced. The alumina industry in China rapidly develops, the alumina yield in 2020 reaches 8900 ten thousand tons, and the alumina has become the first large alumina producing country in the world. At present, the annual emission of domestic red mud is about 1.1 hundred million tons/year, and the accumulated accumulation amount exceeds 5 hundred million tons. The harmful substances pollute the water body and harm the living beings. The red mud is mainly stored in dry piles internationally, so that the dry piles occupy land and pollute water systems, and fine red mud particles fly along with wind after being dried, so that the atmosphere is polluted. The treatment of red mud has been a worldwide problem.
The main component of phosphogypsum is CaSO 4 (about 90%) and various impurities such as undegraded phosphate ore, unwashed phosphoric acid, calcium fluoride, iron and aluminum compounds, acid insoluble matter, organic matter, etc. In 2020, the amount of phosphogypsum produced by phosphorus chemical enterprises in China reaches 9400 ten thousand tons/year, and the phosphogypsum is mainly stacked except for a small amount of phosphogypsum used for building materials.
The mining industry simultaneously extracts resources from the earth and forms a large number of goaf areas in the ground due to mining, i.e., the extraction space left in the ground after the ore is extracted. When stoping is carried out by adopting a caving mining method, ore is extracted under the cover rock, and the stoping space is required to be filled by the upper rock of caving, so that the ground surface is collapsed. When stoping is performed by adopting the open stope mining method, a goaf is left after ore removal. The existence of the goaf redistributes the stress in the rock mass, and stress concentration is generated at the periphery of the goaf to form ground pressure, so that the top plate, surrounding rock and ore pillars of the goaf are deformed, destroyed and moved, the top plate is produced to fall or the surrounding rock at the upper part is forcefully caving in to fill the goaf, and the ground surface is caused to collapse.
The general idea of realizing the non-waste mining of the ore deposit is to utilize mineral resources and protect perspective resources to the maximum extent by innovating ore deposit mining technology and technique according to the concept of industrial ecology, reduce the output of mine solid wastes to the maximum extent, convert large amounts of industrial solid wastes such as red mud, phosphogypsum and the like into secondary resources to be reused and inhibit surface subsidence, thereby fundamentally solving the problems of mining area environment and ecological damage.
Conventional mine filling generally requires the use of portland cement as a binder, but due to the high alkalinity of red mud, the use of cement as a binder, there is alkali reversion and thus a decrease in post strength and even structural failure (cracking, chalking). Therefore, special cementing materials are required to be developed aiming at the characteristics of the red mud.
There are cases of sintering process red mud self-cementing filling mines and phosphogypsum filling mines in China, but research and application of full-solid waste cementing material filling mines by using Bayer process red mud and modified phosphogypsum are not seen.
Disclosure of Invention
The invention aims to provide a manufacturing method of red mud-modified phosphogypsum mine filling material, which aims to compound red mud and modified phosphogypsum into an ecological filling material for mining industry, solve the problem of low usage amount of red mud in a mine filling Bayer process, and combine the reduction of mining cost with harmless, large-scale and resource digestion of red mud and phosphogypsum.
According to one aspect of the invention, the red mud-modified phosphogypsum mine filling material is characterized by being prepared from the following raw materials, by weight, 60-90 parts of Bayer process red mud, 10-30 parts of modified phosphogypsum and 0.10-10 parts of composite additive.
In some embodiments, the bayer process red mud is solid waste from bayer process alumina production.
In some embodiments, the method of making the modified phosphogypsum comprises: phosphogypsum, fly ash and anthracite which are byproducts of the phosphate fertilizer industry are uniformly mixed, ground and homogenized, calcined for 28-38 min at 1100-1350 ℃, and then ground to below 120 meshes to obtain the hydraulic cementing material.
In some embodiments, the preparation raw materials of the modified phosphogypsum comprise the following substances in parts by weight: 65 to 80 parts of phosphogypsum, 18 to 34 parts of fly ash and 2 to 4 parts of anthracite.
In some embodiments, the composite auxiliary agent is prepared by mixing the following raw materials in parts by weight: 0 to 100 parts of silica fume and 0 to 100 parts of phosphorous slag micropowder.
In some embodiments, the silica fume is SiO produced during the smelting of ferrosilicon and/or industrial silicon 2 And Si gas and oxygen in the air are rapidly oxidized and condensed to form a superfine siliceous powder material; the phosphorus slag micro powder is water quenched slag which is a byproduct of yellow phosphorus industryAnd (5) drying and grinding to below 120 meshes to obtain the powder material.
The composite auxiliary agent is used for adjusting the activity SiO in the final solid material mixture 2 Active Al 2 O 3 And NaOH component in red mud to facilitate reaction to form a mixture similar to albite (Na 2 O·Al 2 O 3 ·6SiO 2 ) The mineral structure inhibits migration and dissolution of sodium ions, thereby avoiding structural damage caused by alkali return.
According to another aspect of the invention, a manufacturing method of the red mud-modified phosphogypsum mine filling material is provided, and the manufacturing method is characterized in that the modified phosphogypsum and the composite auxiliary agent are used for solidifying and modifying the high-alkaline red mud to obtain the filling material with the strength and heavy metal dissolution meeting the mine filling requirements.
In some embodiments, a method for making a red mud-modified phosphogypsum mine filler comprises the following steps:
firstly, scattering and crushing red mud with the water content of 25-35% to below 3mm for later use;
premixing a composite additive, modified phosphogypsum and scattered and crushed red mud to obtain a solid mixture;
step three, mixing water and a solid mixture, and strongly stirring to obtain filling paste slurry, wherein the mass ratio of the solid mixture to the water is 1:0.4-0.7;
and step four, conveying the filling paste slurry to the mine for filling and curing to obtain the mine filling material.
In some embodiments, the mine filler achieves initial set 1 hour after filling, with a 7 day compressive strength greater than 3.5Mpa and a 28 day compressive strength greater than 5Mpa.
The beneficial effects of the invention are as follows:
1. the red mud contains a large amount of clay particles and colloidal particles, so that the slurry has good stability, the red mud-modified phosphogypsum mine filling slurry can also ensure the stability of the paste slurry under the low concentration condition of good fluidity, the paste is not isolated, and the filling void area has good leveling property, and the property has important significance for filling the narrow and long filling working surface and the gently inclined working surface;
2. the red mud particles are finer, and the abrasion to the pipeline in the red mud-modified phosphogypsum mine filling slurry is low, so that the service life of the filling pipeline is prolonged.
The invention adjusts the activity SiO in the modified phosphogypsum and the composite additive 2 Active Al 2 O 3 And the proportion of NaOH components in the red mud to facilitate the activity of SiO 2 And active Al 2 O 3 Reacts with NaOH to form a catalyst similar to albite (Na 2 O·Al 2 O 3 ·6SiO 2 ) Mineral structure:
6SiO 2 +Al 2 O 3 +2NaOH——→Na 2 O·Al 2 O 3 ·6SiO 2 +H 2 O
because the albite is indissolvable in water, sodium ions are fixed in the filling material, and alkali return and structural damage caused by the sodium ions are avoided.
3. The invention accords with four main functions of mine ecological filling: improving the utilization rate of resources, storing perspective resources, preventing the collapse of the ground surface and fully utilizing solid wastes.
Drawings
Fig. 1 is a process flow diagram of a method for manufacturing a red mud-modified phosphogypsum mine filling material according to an embodiment of the invention.
Detailed Description
The invention will be described in further detail with reference to specific examples.
The red mud-modified phosphogypsum mine filling material is prepared from the following raw materials, by weight, 60-90 parts of Bayer process red mud, 10-30 parts of modified phosphogypsum and 0.10-10 parts of composite additive.
The Bayer process red mud is solid waste discharged from the production of alumina by the Bayer process.
The modified phosphogypsum is prepared by uniformly mixing phosphogypsum, fly ash and anthracite which are byproducts of the phosphate fertilizer industry, grinding and homogenizing, calcining at 1100-1350 ℃ for 28-38 min, and grinding to below 120 meshes. The raw materials of the modified phosphogypsum are as follows in parts by weight: 65 to 80 parts of phosphogypsum, 18 to 34 parts of fly ash and 2 to 4 parts of anthracite.
The composite auxiliary agent is prepared by mixing the following raw materials in parts by weight: 0 to 100 parts of silica fume and 0 to 100 parts of phosphorous slag micropowder. The silicon ash adopts SiO generated when ferrosilicon alloy or/and industrial silicon is smelted 2 And Si gas and oxygen in the air are rapidly oxidized and condensed to form a superfine siliceous powder material; the phosphorus slag micropowder is water quenched slag which is a byproduct of yellow phosphorus industry, and is dried and ground to be below 120 meshes to obtain a powder material.
The method for preparing the red mud-modified phosphogypsum mine filling material by adopting the raw materials comprises the following steps: and curing and modifying the high-alkaline red mud by using the modified phosphogypsum and the composite additive to obtain the filling material meeting the mine filling requirement. The method specifically comprises the following steps:
firstly, transferring red mud with the water content of 25% -35% in a red mud storage yard to an intermediate storage bin through a loader, discharging the red mud through a vibration discharging machine, sending the red mud into a scattering crusher through a belt conveyor, scattering and crushing the red mud to below 3mm, and sending the scattered and crushed red mud into a double-shaft stirrer for proportioning and premixing through the belt conveyor.
And step two, conveying the composite auxiliary agent into a bin by adopting high-pressure air, discharging by a screw conveyor, metering by a screw electronic scale, and conveying to a double-shaft stirrer for proportioning and premixing.
And thirdly, conveying the modified phosphogypsum into a storage bin by adopting compressed air, discharging by a screw conveyor, metering by a screw electronic scale, and conveying to a double-shaft stirrer for proportioning and premixing.
And fourthly, introducing the water required by the preparation of the filling paste by an adjusting water tank, metering by a flowmeter, and conveying to a double-shaft stirrer for mixing, wherein the mass ratio of the solid material to the water is 1:0.4-0.7.
And fifthly, uniformly mixing the red mud, the composite additive, the modified phosphogypsum and the mixed water which are conveyed to the double-shaft stirrer, and then carrying out strong high-speed stirring by a strong stirrer. And the stirred qualified filling paste slurry is conveyed to a filling stope under a mine through a filling pipeline under the action of a high-pressure diaphragm pump.
The mine filling material realizes initial setting after 1 hour of filling, the compression strength is more than 3.5Mpa in 7 days, and the compression strength is more than 5Mpa in 28 days. The performance index meets the mine filling requirement, and the performance requirement of the mine filling is seen in GB/T39489-2020.
Example 1
Fig. 1 schematically shows a process flow diagram of a method of red mud-modified phosphogypsum mine filler according to the invention.
As shown in fig. 1, the method for preparing the red mud-modified phosphogypsum mine filling material comprises the following steps:
firstly, bayer process red mud slurry discharged from the bottom flow of a last sedimentation tank of an alumina enterprise sedimentation washing process is subjected to plate and frame filter pressing to obtain a red mud filter cake with the water content of 25% -35%, the red mud filter cake is transported to a red mud storage yard 6 for transfer by a mine car, then the red mud filter cake is transported to an upper intermediate bin 4 by a loader, is discharged by a vibrating discharger 3 with a broken arch, is sent to a breaking crusher 7 by a belt conveyor, the broken red mud is sent to a lower intermediate bin 4, and is sent to a double-shaft stirrer 8 for batching and premixing after discharge metering;
the red mud composite auxiliary agent is transported to the site through a tank car, is conveyed to a red mud composite auxiliary agent storage bin 1 for storage by compressed air, is discharged by a screw conveyor, adjusts the frequency of a variable frequency speed regulator of the screw conveyor, regulates and controls the feeding amount of the red mud composite auxiliary agent, and is conveyed to a double-shaft stirrer 8 for proportioning and premixing after being metered by a screw electronic scale;
the modified phosphogypsum is transported to the site through a tank truck, compressed air is conveyed to a modified phosphogypsum storage bin 5 for storage, the modified phosphogypsum is discharged by a screw conveyor, the frequency of a variable frequency speed regulator of the screw conveyor is regulated, the feeding amount of the modified phosphogypsum is regulated, and the modified phosphogypsum is conveyed to a double-shaft stirrer 8 for proportioning and premixing after being metered by a screw electronic scale;
the water required for making the filling paste is introduced from a water tank 2, is metered by a flowmeter, and is added into a double-shaft stirrer for mixing according to the water-cement ratio of 0.4-1.2.
The red mud, the composite additive, the modified phosphogypsum and the mixed water which are conveyed into the double-shaft stirrer 8 are uniformly mixed, and then are subjected to strong high-speed stirring for 10 to 30 minutes by a strong stirrer 9. And the stirred qualified filling paste slurry is conveyed to a filling stope under a mine through a filling pipeline under the action of a high-pressure diaphragm pump.
Example 2
The red mud-modified phosphogypsum mine filling material is prepared by adopting the method of the embodiment 1, and the proportion of the red mud, the composite auxiliary agent and the modified phosphogypsum entering the double-shaft mixer is 7:1:2, adding a proper amount of adjusting water, stirring and uniformly mixing, and stirring for 15 minutes by a strong stirrer 9 to prepare the red mud-modified phosphogypsum mine filling slurry, wherein the non-dehydration concentration of the red mud-modified phosphogypsum mine filling slurry is 62 percent, which is reduced by 16 percent compared with the non-dehydration concentration of the cement whole tailing slurry of 78 percent; the uniaxial compressive strength of the test piece 28d was 6.8MPa.
Example 3
The red mud-modified phosphogypsum mine filling material is prepared by adopting the method of the embodiment 1, and the proportion of the red mud, the composite auxiliary agent and the modified phosphogypsum entering the double-shaft mixer is 7.5:0.5:1.4, adding a proper amount of adjusting water, stirring and uniformly mixing, and stirring for 25 minutes by a strong stirrer 9 to prepare the red mud-modified phosphogypsum mine filling slurry, wherein the non-dehydration concentration of the red mud-modified phosphogypsum mine filling slurry is 58 percent, and is reduced by 20 percent compared with the non-dehydration concentration of 78 percent of the cement whole tailing slurry; the uniaxial compressive strength of the test piece 28d was 5.8MPa.
Example 4
The red mud-modified phosphogypsum mine filling material is prepared by adopting the method of the embodiment 1, and the proportion of the red mud, the composite auxiliary agent and the modified phosphogypsum entering the double-shaft mixer is 8:0.2:1, adding a proper amount of adjusting water, stirring and uniformly mixing, and stirring for 30 minutes by a strong stirrer 9 to prepare the red mud-modified phosphogypsum mine filling slurry, wherein the non-dehydration concentration of the red mud-modified phosphogypsum mine filling slurry is 55 percent, which is reduced by 23 percent compared with the non-dehydration concentration of 78 percent of the cement whole tailing slurry; the uniaxial compressive strength of the test piece 28d was 5.0MPa.
Example 5
The red mud-modified phosphogypsum mine filling material is prepared by adopting the method of the embodiment 1, and the proportion of the red mud, the composite auxiliary agent and the modified phosphogypsum entering the double-shaft mixer is 6:0.1:3, adding a proper amount of adjusting water, stirring and uniformly mixing, and stirring for 20 minutes by a strong stirrer 9 to prepare the red mud-modified phosphogypsum mine filling slurry, wherein the non-dehydration concentration of the red mud-modified phosphogypsum mine filling slurry is 53 percent, and is reduced by 25 percent compared with the non-dehydration concentration of 78 percent of the cement whole-tailing slurry; the uniaxial compressive strength of the test piece 28d was 5.2MPa.
Example 6
The red mud-modified phosphogypsum mine filling material is prepared by adopting the method of the embodiment 1, and the proportion of the red mud, the composite auxiliary agent and the modified phosphogypsum entering the double-shaft mixer is 8:0.01:2.5, adding a proper amount of adjusting water, stirring and uniformly mixing, and stirring for 30 minutes by a strong stirrer 9 to prepare the red mud-modified phosphogypsum mine filling slurry, wherein the non-dehydration concentration of the red mud-modified phosphogypsum mine filling slurry is 67 percent, and is reduced by 11 percent compared with the non-dehydration concentration of 78 percent of the cement whole tailing slurry; the uniaxial compressive strength of the test piece 28d was 3.8MPa.
What has been described above is merely some embodiments of the present invention. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.
Claims (6)
1. The red mud-modified phosphogypsum mine filling material is characterized by being prepared from the following raw materials, by weight, 60-90 parts of Bayer process red mud, 10-30 parts of modified phosphogypsum and 0.10-10 parts of composite additive;
the preparation method of the modified phosphogypsum comprises the following steps: mixing phosphogypsum, fly ash and anthracite which are byproducts of the phosphate fertilizer industry uniformly, grinding and homogenizing, calcining at 1100-1350 ℃ for 28-38 min, and grinding to below 120 meshes to obtain a hydraulic cementing material;
the preparation raw materials of the modified phosphogypsum comprise the following substances in parts by weight: 65 to 80 parts of phosphogypsum, 18 to 34 parts of fly ash and 2 to 4 parts of anthracite;
the composite auxiliary agent is prepared by mixing the following raw materials in parts by weight: 0 to 100 parts of silica fume and 0 to 100 parts of phosphorous slag micropowder;
the mine filling material realizes initial setting after 1 hour of filling, and the compression strength is more than 3.5MPa in 7 days and more than 5MPa in 28 days.
2. The red mud-modified phosphogypsum mine filler of claim 1, wherein the bayer process red mud is solid waste discharged from the bayer process for producing alumina.
3. The red mud-modified phosphogypsum mine filling material as claimed in claim 1, wherein the silica fume is SiO generated during smelting of ferrosilicon and/or industrial silicon 2 And Si gas and oxygen in the air are rapidly oxidized and condensed to form a superfine siliceous powder material; the phosphorus slag micro powder is water quenched slag which is a byproduct of yellow phosphorus industry, and is dried and ground to be below 120 meshes to obtain a powder material.
4. The red mud-modified phosphogypsum mine filling material as claimed in claim 1, wherein the composite auxiliary agent adjusts the active SiO in the final solid material mixture 2 Active Al 2 O 3 And NaOH component in red mud to form Na by hydration 2 O·Al 2 O 3 ·6SiO 2 Gel structure, inhibit migration and dissolution of sodium ions.
5. The red mud-modified phosphogypsum mine filling material according to claim 1, which is characterized in that the preparation method is to solidify and modify the high alkaline red mud by using modified phosphogypsum and a composite additive to obtain the mine filling material meeting the mine filling requirement.
6. The red mud-modified phosphogypsum mine filling material as set forth in claim 5, which is characterized in that the preparation method comprises the following steps:
firstly, scattering and crushing red mud with the water content of 25-35% to below 3mm for later use;
premixing a composite additive, modified phosphogypsum and scattered and crushed red mud to obtain a solid mixture;
step three, mixing water and the solid mixture and strongly stirring to obtain filling paste slurry, wherein the mass ratio of the solid mixture to the water in the step three is 1:0.4-0.7;
and step four, conveying the filling paste slurry to the mine for filling and curing to obtain the mine filling material.
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| CN113526887A (en) * | 2021-08-02 | 2021-10-22 | 贵州理工学院 | Red mud-phosphogypsum composite cementing material and preparation method thereof |
| CN113526941A (en) * | 2021-08-18 | 2021-10-22 | 贵州理工学院 | Gob-side entry retaining roadside filling support material using modified industrial gypsum to cure red mud and preparation method thereof |
| CN113880539A (en) * | 2021-11-24 | 2022-01-04 | 贵州理工学院 | Mine karst cave filling slurry and preparation method thereof |
| CN114380518B (en) * | 2022-01-25 | 2023-03-24 | 中国地质大学（武汉） | Bayer process red mud-phosphogypsum baking-free cementing material and preparation method thereof |
| CN114560672A (en) * | 2022-03-25 | 2022-05-31 | 贵州理工学院 | Preparation method of ultrahigh water material, ultrahigh water material and application |
| CN115215624B (en) * | 2022-05-30 | 2023-05-05 | 湖北工业大学 | Carbon dioxide geological sequestration method using phosphogypsum as filler |
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