CN113956011A - Semi-hydrated phosphogypsum-based filling aggregate and preparation method thereof - Google Patents
Semi-hydrated phosphogypsum-based filling aggregate and preparation method thereof Download PDFInfo
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- CN113956011A CN113956011A CN202111485847.XA CN202111485847A CN113956011A CN 113956011 A CN113956011 A CN 113956011A CN 202111485847 A CN202111485847 A CN 202111485847A CN 113956011 A CN113956011 A CN 113956011A
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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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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
-
- 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 provides a semi-hydrated phosphorus gypsum-based filling aggregate which is formed by granulating a semi-hydrated phosphorus gypsum modified composition; the modified composition of semi-hydrated phosphogypsum comprises: 100 parts of phosphorus-containing matrix, 0.5-3 parts of carbide slag and 0.2-0.4 part of sodium chloride; the phosphorus-containing matrix comprises one or more of phosphogypsum hemihydrate, phosphogypsum dihydrate and phosphate rock tailings, and at least comprises phosphogypsum hemihydrate. Compared with the prior art, the phosphorus-containing matrix which is easy to convert quickly is granulated and pelletized to form the filling aggregate with strength, and meanwhile, the carbide slag is added to further improve the strength of the filling aggregate, so that the obtained filling aggregate has a good crushing value, is convenient to store and does not generate caking phenomenon; the filler is used as a filling aggregate, has no harm to the environment, can obviously reduce the bleeding condition of slurry, shortens the final setting time, improves the strength of a filling body, reduces the filling cost, and has good economic benefit, environmental benefit and social benefit.
Description
Technical Field
The invention belongs to the technical field of gypsum building materials, and particularly relates to semi-hydrated phosphogypsum-based filling aggregate and a preparation method thereof.
Background
The phosphogypsum is solid waste residue discharged in the process of producing phosphoric acid, and 4-5 t of phosphogypsum can be produced when 1t of phosphoric acid is produced. At present, the comprehensive utilization rate of the phosphogypsum is low at home and abroad, so that a large amount of phosphogypsum needs to be stockpiled, a large amount of land resources are occupied, and phosphorus, sulfur, fluorine and the like in the phosphogypsum are easy to be carried by rainwater in the rainwater washing process, so that the environmental pollution is caused. Therefore, modification treatment of phosphogypsum has appeared in the prior art, so as to expand the utilization of phosphogypsum.
At present, the main consumption path of phosphogypsum is in the aspects of cement retarders, gypsum building materials, chemical raw materials and the like, and certainly, researchers research the phosphogypsum as an aggregate for mine filling, but the phosphogypsum is not an ideal filling material because the phosphogypsum has the characteristics of small permeability and slurry weakening when meeting water due to extremely fine particles. And because the production processes of the wet-process phosphoric acid are different, the components of the generated byproduct phosphogypsum are also different, and the difficulty of modification treatment and application of the phosphogypsum is further increased.
Disclosure of Invention
In view of the above, the technical problem to be solved by the invention is to provide a high-strength semi-hydrated phosphogypsum-based filling aggregate and a preparation method thereof.
The invention provides a semi-hydrated phosphorus gypsum-based filling aggregate which is formed by granulating a semi-hydrated phosphorus gypsum modified composition;
the modified composition of semi-hydrated phosphogypsum comprises: 100 parts of phosphorus-containing matrix, 0.5-3 parts of carbide slag and 0.2-0.4 part of sodium chloride;
the phosphorus-containing matrix comprises one or more of phosphogypsum hemihydrate, phosphogypsum dihydrate and phosphate rock tailings, and at least comprises phosphogypsum hemihydrate.
Preferably, the phosphorus-containing matrix comprises phosphogypsum dihydrate and phosphogypsum hemihydrate or one of phosphogypsum dihydrate and phosphate rock tailings; the mass ratio of one of the dihydrate phosphogypsum and the phosphate rock tailings to the hemihydrate phosphogypsum is (35-50): (50-65).
Preferably, the mass ratio of the semi-hydrated phosphogypsum to the carbide slag is 10: (0.1-0.5).
Preferably, the modified composition of phosphogypsum hemihydrate comprises: 100 parts of semi-hydrated phosphogypsum, 1-3 parts of carbide slag and 0.2-0.4 part of sodium chloride;
or comprises the following steps: 65 parts of semi-hydrated phosphogypsum, 35 parts of dihydrate phosphogypsum, 1-3 parts of carbide slag and 0.2-0.4 part of sodium chloride;
or comprises the following steps: 50 parts of semi-hydrated phosphogypsum, 50 parts of phosphorite tailings, 0.5-1.5 parts of carbide slag and 0.2-0.4 part of sodium chloride.
Preferably, the modified composition of phosphogypsum hemihydrate comprises: 100 parts of semi-hydrated phosphogypsum, 2.5 parts of carbide slag and 0.3 part of sodium chloride;
or comprises the following steps: 65 parts of semi-hydrated phosphogypsum, 35 parts of dihydrate phosphogypsum, 2.5 parts of carbide slag and 0.3 part of sodium chloride;
or comprises the following steps: 50 parts of semi-hydrated phosphogypsum, 50 parts of phosphorite tailings, 1.5 parts of carbide slag and 0.3 part of sodium chloride.
Preferably, the hemihydrate phosphogypsum is a byproduct of phosphoric acid production by a hemihydrate phosphoric acid process; the free water content of the semi-hydrated phosphogypsum is 20-25 percent; the crystal water content of the semi-hydrated phosphogypsum is 5-9%.
Preferably, the average particle size of the phosphate rock tailings is 10-75 μm; the free water content of the phosphate rock tailings is 10-12%.
The invention also provides a preparation method of the semi-hydrated phosphogypsum-based filling aggregate, which comprises the following steps:
and atomizing the mixed aqueous solution of the carbide slag and the sodium chloride, mixing the atomized mixed aqueous solution with the phosphorus-containing matrix, and granulating to obtain the semi-hydrated phosphogypsum-based filling aggregate.
The invention also provides filling slurry which comprises the semi-hydrated phosphogypsum-based filling aggregate.
Preferably, the mortar also comprises cement and tailings; the mass ratio of the cement to the tailings to the semi-hydrated phosphogypsum-based filling aggregate is 1: (2-4): (1-3).
The invention provides a semi-hydrated phosphorus gypsum-based filling aggregate which is formed by granulating a semi-hydrated phosphorus gypsum modified composition; the modified composition of semi-hydrated phosphogypsum comprises: 100 parts of phosphorus-containing matrix, 0.5-3 parts of carbide slag and 0.2-0.4 part of sodium chloride; the phosphorus-containing matrix comprises one or more of phosphogypsum hemihydrate, phosphogypsum dihydrate and phosphate rock tailings, and at least comprises phosphogypsum hemihydrate. Compared with the prior art, the phosphorus-containing matrix which is easy to convert quickly is granulated and pelletized to form the filling aggregate with strength, and meanwhile, the carbide slag is added to further improve the strength of the filling aggregate, so that the obtained filling aggregate has a good crushing value, can completely replace sandstone, is convenient to store and does not generate caking phenomenon; the filler is used as a filling aggregate, has no harm to the environment, can obviously reduce the bleeding condition of slurry, shortens the final setting time, improves the strength of a filling body, reduces the filling cost, and has good economic benefit, environmental benefit and social benefit.
Drawings
FIG. 1 is a schematic view of the preparation process of the phosphogypsum hemihydrate-based filling aggregate provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a semi-hydrated phosphorus gypsum-based filling aggregate which is formed by granulating a semi-hydrated phosphorus gypsum modified composition; the modified composition of semi-hydrated phosphogypsum comprises: 100 parts of phosphorus-containing matrix, 0.5-3 parts of carbide slag and 0.2-0.4 part of sodium chloride; the phosphorus-containing matrix comprises one or more of phosphogypsum hemihydrate, phosphogypsum dihydrate and phosphate rock tailings, and at least comprises phosphogypsum hemihydrate.
The modified composition of the semi-hydrated phosphogypsum takes a phosphorus-containing matrix as a main component; the phosphorus-containing matrix comprises one or more of phosphogypsum hemihydrate, phosphogypsum dihydrate and phosphate rock tailings, and at least comprises phosphogypsum hemihydrate; preferably, the phosphorus-containing matrix consists of phosphogypsum hemihydrate or one or two of phosphogypsum dihydrate and phosphate rock tailings and phosphogypsum hemihydrate, and further preferably, the phosphorus-containing matrix consists of phosphogypsum hemihydrate or one of phosphogypsum dihydrate and phosphate rock tailings and phosphogypsum hemihydrate; the mass ratio of one of the phosphogypsum dihydrate and the phosphate rock tailings to the phosphogypsum hemihydrate is preferably (35-50): (50-65); the semi-hydrated phosphogypsum is a by-product of phosphoric acid production by a semi-hydrated phosphoric acid process; the free water content of the semi-hydrated phosphogypsum is preferably 20-25%; the crystallization water content of the semi-hydrated phosphogypsum is preferably 5-9%, more preferably 6-8%, and still more preferably 6.5-7.5%; in the examples provided by the invention, the crystal water content of the hemihydrate phosphogypsum is specifically 7.2%, 6.5% or 7.4%; the dihydrate phosphogypsum is a product converted from the hemihydrate phosphogypsum and can also be a byproduct generated in a phosphoric acid process by a dihydrate method; the phosphate rock tailings are fine-grained ores obtained by mineral separation in a phosphate rock separation plant; the average particle size of the phosphate rock tailings is preferably 10-75 mu m; the free water content of the phosphate rock tailings is preferably 10-12%.
The semi-hydrated phosphogypsum modified composition provided by the invention takes carbide slag and sodium chloride as modifiers to modify semi-hydrated phosphogypsum; the mass ratio of the semi-hydrated phosphogypsum to the carbide slag is preferably 10: (0.1 to 0.5), more preferably 10: (0.2 to 0.4), and more preferably 10: (0.25-0.4).
Preferably, in the present invention, the modified composition of phosphogypsum hemihydrate comprises: 100 parts of semi-hydrated phosphogypsum, 1-3 parts of carbide slag and 0.2-0.4 part of sodium chloride;
or comprises the following steps: 65 parts of semi-hydrated phosphogypsum, 35 parts of dihydrate phosphogypsum, 1-3 parts of carbide slag and 0.2-0.4 part of sodium chloride;
or comprises the following steps: 50 parts of semi-hydrated phosphogypsum, 50 parts of phosphorite tailings, 0.5-1.5 parts of carbide slag and 0.2-0.4 part of sodium chloride.
Further preferably, the modified composition of phosphogypsum hemihydrate comprises: 100 parts of semi-hydrated phosphogypsum, 2.5 parts of carbide slag and 0.3 part of sodium chloride;
or comprises the following steps: 65 parts of semi-hydrated phosphogypsum, 35 parts of dihydrate phosphogypsum, 2.5 parts of carbide slag and 0.3 part of sodium chloride;
or comprises the following steps: 50 parts of semi-hydrated phosphogypsum, 50 parts of phosphorite tailings, 1.5 parts of carbide slag and 0.3 part of sodium chloride.
The semi-hydrated phosphorus gypsum-based filling aggregate provided by the invention is formed by granulating the semi-hydrated phosphorus gypsum modified composition; the particle size of the semi-hydrated phosphogypsum-based filling aggregate is preferably 5-20 mm; the free water content of the semi-hydrated phosphogypsum-based filling aggregate is preferably less than 5 percent, and more preferably less than 3 percent.
The phosphorus-containing matrix which is easy to convert quickly is granulated and pelletized to form filling aggregate with strength, and meanwhile, the carbide slag is added to further improve the strength of the filling aggregate, so that the obtained filling aggregate has a good crushing value, can completely replace sandstone, is convenient to store and does not cause caking; the filler is used as a filling aggregate, has no harm to the environment, can obviously reduce the bleeding condition of slurry, shortens the final setting time, improves the strength of a filling body, reduces the filling cost, and has good economic benefit, environmental benefit and social benefit.
The invention also provides a preparation method of the semi-hydrated phosphogypsum-based filling aggregate, which comprises the following steps: and atomizing the mixed aqueous solution of the carbide slag and the sodium chloride, mixing the atomized mixed aqueous solution with the phosphorus-containing matrix, and granulating to obtain the semi-hydrated phosphogypsum-based filling aggregate.
Wherein, the sources of all raw materials are not specially limited and can be sold in the market; the types and contents of the carbide slag, the sodium chloride and the phosphorus-containing matrix are the same as those described above, and are not described again.
Referring to fig. 1, fig. 1 is a schematic view of a preparation process of a semi-hydrated phosphogypsum-based filling aggregate provided by the invention.
Atomizing the mixed aqueous solution of the carbide slag and sodium chloride, mixing the atomized mixed aqueous solution with a phosphorus-containing matrix, and granulating; wherein the mass concentration of the carbide slag and the sodium chloride in the mixed aqueous solution is preferably 8-10%; the mixing is preferably carried out in a disk granulator, and the mixed aqueous solution of the carbide slag and the sodium chloride is atomized into the phosphorus-containing matrix by using a spraying system while rotating for granulation.
After granulation and pelletization, natural air drying is preferred, and in the present invention, it is preferred to place the pellets in a well-ventilated place so that they can be quickly air-dried.
And (3) preferably piling the naturally air-dried material until the free water content is less than 5 percent, more preferably less than 3 percent, and obtaining the semi-hydrated phosphogypsum-based filling aggregate.
The method has simple process, and the prepared semi-hydrated phosphogypsum-based filling aggregate has good crushing value, can completely replace sandstone, is convenient to store and does not generate caking phenomenon.
The invention also provides filling slurry which comprises the semi-hydrated phosphogypsum-based filling aggregate.
Preferably, the mortar also comprises cement and tailings; the mass ratio of the cement to the tailings to the semi-hydrated phosphogypsum-based filling aggregate is preferably 1: (2-4): (1-3), more preferably 1:3: 2.
the semi-hydrated phosphogypsum-based filling aggregate provided by the invention is used for preparing filling slurry to fill a mine, so that the mine filling cost can be reduced, and solid waste can be consumed.
In order to further illustrate the present invention, the present invention provides a semi-hydrated phosphogypsum-based filling aggregate and a preparation method thereof, which will be described in detail with reference to examples.
The reagents used in the following examples are all commercially available.
The semi-hydrated phosphogypsum used in the embodiment is derived from No. 1 fresh semi-hydrated phosphogypsum produced by Hecheng chemical engineering Co., Ltd, Guizhou, and the specific parameters are shown in the following table:
| water P% | Total P/%) | Co-crystal P/%) | Water F/%) | Total F/%) | Free water/%) | Water of crystallization/%) | pH |
| 0.48 | 0.87 | 0.57 | 0.24 | 0.59 | 17.52 | 6.05 | 3.82 |
The specific parameters of the carbide slag used in the examples are given in the following table:
the specific parameters of the tailings used in the examples are given in the following table:
| total P/%) | Total F/%) | Water P/%) | Water F/%) | pH | Water content% |
| 5.77 | 0.52 | 0.1 | 0.01 | 7.3 | 10.54 |
The specific parameters of the dihydrate gypsum (i.e. aged gypsum) used in the examples are given in the following table:
| free water/%) | Water of crystallization/%) | pH | Total P/%) | Total F/%) | Water P/%) | Water F/%) |
| 12.85 | 19.47 | 3.48 | 0.74 | 0.79 | 0.41 | 0.11 |
The type of cement used in the examples and comparative examples was ordinary 425 cement.
Comparative example 1
The source of the waste rock of the phosphate rock is the waste rock stripped in mining, the waste rock with the particle size range of 5-20 mm is selected after crushing, and the specific parameters are shown in the following table.
Example 1
2.5 parts by weight of carbide slag and 0.3 part by weight of sodium chloride were mixed with water to prepare a mixed solution having a mass concentration of 10%.
100 parts by weight of hemihydrate phosphogypsum with 7.2 percent of crystal water is conveyed to a disc granulator for rotary granulation, and simultaneously, the mixed solution is atomized and added into the hemihydrate phosphogypsum by a spraying system until the particle size is 10 mm.
And placing the granulated and pelletized materials in a warehouse with good ventilation capacity for natural air drying, and then piling until the free water content is less than 3 percent to obtain the semi-hydrated phosphogypsum-based filling aggregate.
Example 2
Prepared according to the preparation procedure of example 1, except that the raw materials consist of: 65 parts of hemihydrate phosphogypsum with crystal water of 6.5 percent, 35 parts of dihydrate phosphogypsum, 2.5 parts of carbide slag and 0.3 part of sodium chloride.
Example 3
Prepared according to the preparation procedure of example 1, except that the raw materials consist of: 50 parts of hemihydrate phosphogypsum with 7.4 percent of crystal water, 50 parts of tailings, 1.5 parts of carbide slag and 0.3 part of sodium chloride.
The performance of the semi-hydrated phosphogypsum-based filling aggregate obtained in the example 1-3 is measured, and the experimental results shown in the following table 1 are obtained.
TABLE 1 measurement results of the properties of the filling aggregate
| Water content% | Crush value/%) | |
| Comparative example 1 | 0.11 | 15.6 |
| Example 2 | 2.72 | 17.4 |
| Example 3 | 3.6 | 27.8 |
| Example 4 | 1.86 | 23.5 |
From the test results, it can be seen that: examples 1-3 had higher water content and crush values than comparative example 1, indicating that the strength of the gypsum pellets was slightly less than that of the crushed stone.
Comparative example 2
According to the semi-hydrated phosphogypsum: and adding water to prepare filling slurry with the solid content of 74 percent, wherein the tailing rate is 1: 5.
Comparative example 3
According to the cement: tailing: comparative example 1-1: 3:2, a fill slurry with 76% solids was prepared by adding water.
Example 4
According to the cement: tailing: example 2-1: 3:2, a fill slurry with 76% solids was prepared by adding water.
Example 5
According to the cement: tailing: example 3-1: 3:2, a fill slurry with 76% solids was prepared by adding water.
Example 6
According to the cement: tailing: example 4-1: 3:2, a fill slurry with 76% solids was prepared by adding water.
The performance of the filling slurry prepared by the method is measured according to the JGJ _ T70-2009 basic performance experimental method standard of building mortar, and the experimental results shown in the following table 2 are obtained.
TABLE 2 measurement results of properties of the filling slurries
From the test results, it can be seen that: comparative example 3 is the same as comparative example 1 in the ratio of ash to waste, but the addition of coarse aggregate increases the strength to a certain extent but does not reduce the bleeding of the slurry; compared with the comparative examples 2 and 3, the slurry coagulation time is shortened, the bleeding rate is reduced, and the strength of the filling body is obviously increased in the examples 4 to 6. The semi-hydrated phosphogypsum-based filling aggregate has good filling effect.
Claims (10)
1. The semi-hydrated phosphogypsum-based filling aggregate is characterized by being formed by granulating a semi-hydrated phosphogypsum modified composition;
the modified composition of semi-hydrated phosphogypsum comprises: 100 parts of phosphorus-containing matrix, 0.5-3 parts of carbide slag and 0.2-0.4 part of sodium chloride;
the phosphorus-containing matrix comprises one or more of phosphogypsum hemihydrate, phosphogypsum dihydrate and phosphate rock tailings, and at least comprises phosphogypsum hemihydrate.
2. The semi-hydrated phosphogypsum-based filling aggregate of claim 1, which is characterized in that the phosphorus-containing substrate comprises one of phosphogypsum dihydrate and phosphate rock tailings and phosphogypsum hemihydrate; the mass ratio of one of the dihydrate phosphogypsum and the phosphate rock tailings to the hemihydrate phosphogypsum is (35-50): (50-65).
3. The semi-hydrated phosphogypsum-based filling aggregate as claimed in claim 1, wherein the mass ratio of the semi-hydrated phosphogypsum to the carbide slag is 10: (0.1-0.5).
4. The phosphogypsum hemihydrate gypsum-based filling aggregate of claim 1, wherein the phosphogypsum hemihydrate modified composition comprises: 100 parts of semi-hydrated phosphogypsum, 1-3 parts of carbide slag and 0.2-0.4 part of sodium chloride;
or comprises the following steps: 65 parts of semi-hydrated phosphogypsum, 35 parts of dihydrate phosphogypsum, 1-3 parts of carbide slag and 0.2-0.4 part of sodium chloride;
or comprises the following steps: 50 parts of semi-hydrated phosphogypsum, 50 parts of phosphorite tailings, 0.5-1.5 parts of carbide slag and 0.2-0.4 part of sodium chloride.
5. The phosphogypsum hemihydrate gypsum-based filling aggregate of claim 1, wherein the phosphogypsum hemihydrate modified composition comprises: 100 parts of semi-hydrated phosphogypsum, 2.5 parts of carbide slag and 0.3 part of sodium chloride;
or comprises the following steps: 65 parts of semi-hydrated phosphogypsum, 35 parts of dihydrate phosphogypsum, 2.5 parts of carbide slag and 0.3 part of sodium chloride;
or comprises the following steps: 50 parts of semi-hydrated phosphogypsum, 50 parts of phosphorite tailings, 1.5 parts of carbide slag and 0.3 part of sodium chloride.
6. The semi-hydrated phosphogypsum-based filling aggregate of claim 1, which is a by-product of the phosphoric acid production of the semi-hydrated phosphoric acid process; the free water content of the semi-hydrated phosphogypsum is 20-25 percent; the crystal water content of the semi-hydrated phosphogypsum is 5-9%.
7. The semi-hydrated phosphogypsum-based filling aggregate as claimed in claim 1, which is characterized in that the average particle size of the phosphate rock tailings is 10-75 μm; the free water content of the phosphate rock tailings is 10-12%.
8. The method for preparing a semi-hydrated phosphogypsum-based filling aggregate according to claim 1, which comprises the following steps:
and atomizing the mixed aqueous solution of the carbide slag and the sodium chloride, mixing the atomized mixed aqueous solution with the phosphorus-containing matrix, and granulating to obtain the semi-hydrated phosphogypsum-based filling aggregate.
9. A filling slurry comprising the phosphogypsum hemihydrate-based filling aggregate according to any one of claims 1 to 7.
10. The filler slurry according to claim 9, further comprising cement and tailings; the mass ratio of the cement to the tailings to the semi-hydrated phosphogypsum-based filling aggregate is 1: (2-4): (1-3).
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| CN115490491A (en) * | 2022-10-19 | 2022-12-20 | 贵州福麟矿业有限公司 | Phosphogypsum-based underground filling paste and preparation method thereof |
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| CN110698157A (en) * | 2019-09-04 | 2020-01-17 | 中电建路桥集团有限公司 | Fly ash granulation method and filling aggregate by using all-solid-waste cementing material |
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| CN114632625A (en) * | 2022-03-24 | 2022-06-17 | 贵州川恒化工股份有限公司 | Collophanite flotation method |
| CN114632625B (en) * | 2022-03-24 | 2023-07-18 | 贵州川恒化工股份有限公司 | Flotation method of collophanite |
| CN115490491A (en) * | 2022-10-19 | 2022-12-20 | 贵州福麟矿业有限公司 | Phosphogypsum-based underground filling paste and preparation method thereof |
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