CN115893966A - Cement-stabilized phosphogypsum bottom ash macadam for road base and preparation method thereof - Google Patents
Cement-stabilized phosphogypsum bottom ash macadam for road base and preparation method thereof Download PDFInfo
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- bottom ash
- phosphogypsum
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- macadam
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- 239000010882 bottom ash Substances 0.000 title claims abstract description 238
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 title claims abstract description 200
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000004575 stone Substances 0.000 claims abstract description 112
- 239000004568 cement Substances 0.000 claims abstract description 103
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 54
- 238000004056 waste incineration Methods 0.000 claims abstract description 32
- 239000010881 fly ash Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims description 71
- 239000000843 powder Substances 0.000 claims description 45
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 26
- 239000011707 mineral Substances 0.000 claims description 26
- 239000000203 mixture Substances 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 23
- 239000010813 municipal solid waste Substances 0.000 claims description 20
- 238000000498 ball milling Methods 0.000 claims description 18
- 238000007885 magnetic separation Methods 0.000 claims description 18
- 238000007873 sieving Methods 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 16
- 238000007605 air drying Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000011398 Portland cement Substances 0.000 claims description 10
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 7
- DLYUQMMRRRQYAE-UHFFFAOYSA-N tetraphosphorus decaoxide Chemical compound O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 claims description 7
- 229910052925 anhydrite Inorganic materials 0.000 claims description 6
- 239000010754 BS 2869 Class F Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000011574 phosphorus Substances 0.000 description 6
- 229910052698 phosphorus Inorganic materials 0.000 description 6
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 5
- YWEUIGNSBFLMFL-UHFFFAOYSA-N diphosphonate Chemical compound O=P(=O)OP(=O)=O YWEUIGNSBFLMFL-UHFFFAOYSA-N 0.000 description 5
- 239000011737 fluorine Substances 0.000 description 5
- 229910052731 fluorine Inorganic materials 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 239000002956 ash Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 239000013067 intermediate product Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000008241 heterogeneous mixture Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 150000003017 phosphorus Chemical class 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Images
Classifications
-
- 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 cement-stabilized phosphogypsum bottom ash macadam for a road base and a preparation method thereof, wherein the cement-stabilized phosphogypsum bottom ash macadam for the road base comprises the following components in parts by mass: 0-400 parts of modified phosphogypsum, 1100-1400 parts of broken stone, 0-300 parts of stone chips, 73-120 parts of modified phosphogypsum cement, 250-850 parts of waste incineration fine bottom ash and 100-250 parts of water; the modified phosphogypsum comprises the following components in percentage by mass: 80-90% of undisturbed phosphogypsum, 5-10% of bottom ash, 1-2% of sodium hydroxide and 3-10% of fly ash. The cement stabilized phosphogypsum bottom ash broken stone for the road base can simultaneously realize the expansion of the resource utilization of the bottom ash and the phosphogypsum, the full replacement of natural fine aggregate and the reduction of the consumption of cement production resources, protect the environment and save the resources at the same time.
Description
Technical Field
The invention relates to the technical field of phosphogypsum, in particular to cement-stabilized phosphogypsum bottom ash macadam for a road base and a preparation method thereof.
Background
In the incineration treatment of garbage, a large amount of solid waste is generated. The solid remained at the bottom of the incinerator after incineration is called bottom ash, the bottom ash accounts for 90 percent of the solid waste, is a heterogeneous mixture and mainly comprises molten slag blocks, glass, stones, small metal fragments and the like, and the main chemical components of the bottom ash are SiO2, caO, al2O3, fe2O3 and the like. As the physical property and the chemical property of the bottom ash are close to those of natural aggregate, the use of the bottom ash as a substitute aggregate is a way for solving the problem of resource utilization of bottom ash waste. However, the gradation of the bottom ash is limited by the local waste incineration type, so that the bottom ash is unstable, and the performance of the cement stabilized macadam is easily affected. When the natural aggregate is used as the fine aggregate, a certain proportion of natural fine aggregate is usually needed to be matched to adjust the gradation, so that the replacement efficiency of the natural aggregate is limited.
Phosphogypsum is a main waste discharged in the production process of phosphorus manufacturing industry. The main component of calcium sulfate also contains a small amount of impurities, mainly comprising phosphate ore which is not fully reacted, intermediate product phosphoric acid, organic matters containing fluorine and phosphorus, and the like. However, at present, most phosphogypsum is treated by open-air stacking, a large amount of land is occupied, harmful substances seriously harm surrounding soil and water resources, and how to utilize the phosphogypsum is a great problem at present.
With the continuous development of our society, the demand for road construction is still very vigorous, most of the road base courses paved in our country at present are semi-rigid base courses, most of the road base courses are cement-stabilized macadam base courses, the consumption of natural aggregates and cementing materials such as cement is huge, but with the proposal of our carbon neutralization goal, the domestic environmental policy becomes stricter, and the exploitation of natural aggregates becomes more and more difficult. The cement production needs to be changed to some extent due to the large resource consumption and high pollution under the current situation.
The existing treatment mode of the phosphogypsum needs to be stockpiled for one year to change the properties of the phosphogypsum so as to meet the use requirement, and the treatment mode leads to low phosphogypsum treatment efficiency.
Disclosure of Invention
The invention aims to provide a cement-stabilized phosphogypsum bottom ash macadam for a road base, which aims to solve the problem of low treatment efficiency of the existing phosphogypsum.
The invention provides a cement-stabilized phosphogypsum bottom ash macadam for a road base, which comprises the following components in percentage by mass: 0-400 parts of modified phosphogypsum, 1100-1400 parts of broken stone, 0-300 parts of stone chips, 73-120 parts of modified phosphogypsum cement, 250-850 parts of waste incineration fine bottom ash and 100-250 parts of water;
the modified phosphogypsum comprises the following components in percentage by mass: 80-90% of undisturbed phosphogypsum, 5-10% of bottom ash, 1-2% of sodium hydroxide and 3-10% of fly ash.
According to the cement-stabilized phosphogypsum bottom ash broken stone for the road base, the original phosphogypsum is modified by using the bottom ash, the fly ash and the sodium hydroxide, cement in a common modification mode is replaced, and the bottom ash modified phosphogypsum is formed.
Further, caSO4 in the undisturbed phosphogypsum is more than or equal to 80 percent; the pH value is more than or equal to 2.5.
Further, the fly ash in the modified phosphogypsum is F-class II-grade fly ash.
Further, the modified phosphogypsum cement comprises the following components in percentage by mass: 35-50% of modified phosphogypsum, 5-10% of cement, 30-40% of mineral admixture and 10-20% of bottom ash micro powder.
Furthermore, the pH value of the modified phosphogypsum cement is 10.0-12.5.
Further, the cement is portland cement.
Further, the mineral admixture is slag, the crushed stone is graded crushed stone, and in the graded crushed stone, 24.19-38.71% of crushed stone with the nominal grain diameter of 4.75-9.5 mm, 35.48-54.84% of crushed stone with the nominal grain diameter of 9.5-19 mm and 20.97-29.03% of crushed stone with the nominal grain diameter of 19-26.5 mm are calculated by mass percent; the mass fraction of dust with the particle size of less than 0.075mm in the graded broken stone is not more than 2%; the crushing value of the graded broken stone is less than or equal to 26 percent.
Further, the passing rate of the stone chips with 0.075mm sieve holes does not exceed 20%.
Further, the particle size of the fine bottom ash of the waste incineration bottom ash is less than 4.75mm.
The invention also provides a method of preparing a cement-stabilized phosphogypsum bottom ash macadam for a road bed, for preparing a cement-stabilized phosphogypsum bottom ash macadam for a road bed as defined in any one of the above, comprising the steps of:
mixing the modified phosphogypsum, the broken stone, the stone chips, the waste incineration bottom ash and the fine bottom ash with water to obtain a mixture;
and mixing the mixture with the modified phosphogypsum cement to obtain the cement-stabilized phosphogypsum bottom ash graded broken stone.
Further, the preparation method of the modified phosphogypsum cement comprises the following steps:
providing waste incineration bottom ash, carrying out magnetic separation, and then naturally weathering and air drying to obtain waste incineration bottom ash particles;
sieving the garbage incineration bottom ash particles by a 4.75mm sieve, taking the garbage incineration bottom ash particles above the 4.75mm sieve, and leaving the bottom ash with the particle size of below 4.75mm for later use;
putting the garbage incineration bottom ash particles into a jaw crusher, and crushing large bottom ash particles into small particles; carrying out magnetic separation and ball milling treatment on the small-particle bottom ash, and sieving the small-particle bottom ash by a sieve of 150 mu m to obtain bottom ash micro powder;
stirring the bottom ash micro powder, the modified phosphogypsum, the cement and the mineral admixture, then carrying out ball milling and mixing, and levigating to obtain the modified phosphogypsum cement.
Further, the preparation method of the modified phosphogypsum comprises the following steps:
providing waste incineration bottom ash, carrying out magnetic separation, and then naturally weathering and air drying to obtain waste incineration bottom ash particles;
sieving the garbage incineration bottom ash particles by a 4.75mm sieve, taking the garbage incineration bottom ash particles above the 4.75mm sieve, and leaving the bottom ash with the particle size of below 4.75mm to obtain standby bottom ash;
putting the standby bottom ash into a jaw crusher to crush large-particle bottom ash in the standby bottom ash into small-particle bottom ash, carrying out magnetic separation and ball milling treatment on the small-particle bottom ash, and sieving the small-particle bottom ash by a 150-micron sieve to obtain bottom ash micro powder;
mixing and stirring undisturbed phosphogypsum, fly ash, the bottom ash micro powder and sodium hydroxide, placing the mixture for 48 hours at the temperature of 30 ℃ and under the environment that the relative humidity is more than 95%, and then placing the mixture into a drying oven at the temperature of 60 ℃ for drying for 24 hours to obtain the modified phosphogypsum;
the pH value of the modified phosphogypsum is more than or equal to 7.5; the water content of the modified phosphogypsum is less than or equal to 15 percent, and the water-soluble phosphorus pentoxide is less than or equal to 0.2 percent.
Drawings
Figure 1 is a flow chart of a method of making cement stabilized phosphogypsum bottom ash macadam for road base in a first embodiment of the invention;
figure 2 is a flow chart of a method of making cement stabilized phosphogypsum bottom ash macadam for road base in a second embodiment of the invention.
Figure 3 is a flow chart of the process for the preparation of modified phosphogypsum cement according to the invention.
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings. Several embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1
The cement-stabilized phosphogypsum bottom ash gravel for the road base comprises the following components in percentage by mass: 0-400 parts of modified phosphogypsum, 1100-1400 parts of broken stone, 0-300 parts of stone chips, 73-120 parts of modified phosphogypsum cement, 250-850 parts of waste incineration fine bottom ash and 100-250 parts of water;
the modified phosphogypsum comprises the following components in percentage by mass: 80-90% of undisturbed phosphogypsum, 5-10% of bottom ash, 1-2% of sodium hydroxide and 3-10% of fly ash.
According to the cement-stabilized phosphogypsum bottom ash macadam for the road base, the original phosphogypsum is modified by using the bottom ash, the fly ash and the sodium hydroxide, cement in a common modification mode is replaced, and the bottom ash-modified phosphogypsum is formed.
Specifically, in the embodiment of the invention, the phosphogypsum is modified, so that the pH value of the phosphogypsum is increased, the phosphogypsum is converted from the original acidic environment to the alkaline environment, and the alkaline environment is favorable for the hydration reaction. Secondly, soluble phosphorus and fluorine in the phosphogypsum are neutralized in the modification operation, so that insoluble phosphate and calcium fluoride are generated, and the influence of the soluble phosphorus and fluorine on the slow setting of cement is removed. The dissolution rate of the modified phosphogypsum in the water solution is reduced, SO that the amount of SO 42-and Ca2+ is reduced, the influence on tricalcium aluminate is reduced in the cement hydration process, and compared with original phosphogypsum, less ettringite is generated, SO that the setting time is shortened, and the early strength is improved compared with the original strength.
In the present application, bottom ash, fly ash and sodium hydroxide are used as modifiers, and the bottom ash and active substances in the fly ash, such as CaO, al2O3 and the like, are dissolved and re-polymerized by a strong alkaline environment formed by the sodium hydroxide under the conditions of free water and high humidity on the surface of phosphogypsum, so that the formed C-S-H gel gradually grows by using CaSO4 in the phosphogypsum as a crystal nucleus, and wraps the crystal nucleus to change the aerohard phosphogypsum into a hydraulic material. Therefore, the phosphogypsum is modified by using the bottom ash, the fly ash and the sodium hydroxide instead of common cement, so that the cost is effectively reduced, the carbon emission caused by using the cement is reduced, and the waste modification is realized.
It is also noted that the bottom ash micropowder is used for replacing partial slag as a mineral admixture in the production of the modified phosphogypsum cement, so that firstly, a resource utilization channel for the coarse bottom ash except for the aggregate is developed; and because the bottom ash mineral components are similar to the slag mineral components (please refer to table 1), the bottom ash micro-powder also has a certain volcanic ash activity, and the cost and the consumed resources for producing cement can be obviously reduced by replacing part of slag as a mineral admixture.
TABLE 1 bottom Ash and slag Compound composition
The method has the advantages that the fine bottom ash and the modified phosphogypsum are used for replacing the stone chips as the fine aggregate of the cement stabilized macadam, so that on one hand, the exploitation of natural light aggregate is reduced, and the resources can be effectively saved; on the other hand, the modified phosphogypsum has certain gelling activity, so that the action of waste replacement does not have great influence on the early strength of the cement stabilized macadam.
Specifically, in one embodiment of the invention, the CaSO4 in the undisturbed phosphogypsum is more than or equal to 80%; the pH value is more than or equal to 2.5.
Specifically, in one embodiment of the invention, the fly ash in the modified phosphogypsum is class F class II fly ash, and meets ASTM C-618.
Specifically, in one embodiment of the present invention, the modified phosphogypsum cement comprises the following components in parts by mass: 35-50% of modified phosphogypsum, 5-10% of cement, 30-40% of mineral admixture and 10-20% of bottom ash micro powder. The bottom ash micro powder has chemical components similar to slag, such as CaO, al2O3, siO2, fe2O3 and the like, belongs to a typical SiO2-CaO-Al2O3 system, has certain volcanic ash activity, and the activity is in positive correlation with the specific surface area, so that the volcanic ash activity of the bottom ash can be better exerted by grinding the bottom ash into the micro powder. In an alkaline environment, siO2 in bottom ash reacts with OH-ions to form intermediate products SiO2 (OH) 22-or SiO (OH) 3-which present A silicon-oxygen tetrahedral structure, and the intermediate products react with CaO in raw materials or sodium ions in A system to finally generate C-S-H gel and N-A-S-H gel. These gel products provide strength and are capable of adsorbing and encapsulating heavy metals.
In particular, in one embodiment of the invention, the modified phosphogypsum cement has a pH value of 10.0-12.5.
Specifically, in one embodiment of the present invention, the cement is portland cement.
Specifically, in one embodiment of the invention, the mineral admixture is slag, preferably S95 grade granulated blast furnace slag powder.
The crushed stone is graded crushed stone, and the graded crushed stone has a nominal grain size of 4.75-9.5 mm of 24.19-38.71%, preferably 25.51-32.26%, and more preferably 32.26% by mass percent; 35.48 to 54.84 percent of broken stones with the nominal grain diameter of 9.5 to 19mm, preferably 43.55 to 54.84 percent, and more preferably 43.55 percent; 20.97-29.03% of broken stones with the nominal grain diameter of 19-26.5 mm, preferably 24.19-29.03%, and more preferably 24.19%; the mass fraction of dust with the particle size of less than 0.075mm in the graded broken stone is not more than 2%, preferably not more than 1.5%; the crushing value of the graded broken stone is less than or equal to 26 percent, and preferably, the crushing value is less than or equal to 22 percent.
Specifically, in one embodiment of the present invention, the stone chips have a 0.075mm mesh passing rate of not more than 20%, and more preferably, the stone chips have a 0.075mm mesh passing rate of not more than 15%.
Specifically, in one embodiment of the invention, the particle size of the fine bottom ash of the waste incineration bottom ash is less than 4.75mm.
Referring to figure 1, the present invention also provides a method of making a cement stabilised phosphogypsum bottom ash macadam for a road substrate, for use in making a cement stabilised phosphogypsum bottom ash macadam for a road substrate as defined in any one of the above, the method comprising the steps of:
the method comprises the following steps: mixing the modified phosphogypsum, the broken stone, the stone chips, the waste incineration bottom ash and the fine bottom ash with water to obtain a mixture; preferably, the natural weathering time may be 28 to 35 days.
Step two: and mixing the mixture with the modified phosphogypsum cement to obtain the cement-stabilized phosphogypsum bottom ash graded broken stone.
Specifically, referring to fig. 2, in an embodiment of the present invention, the preparation method of the modified phosphogypsum comprises the following steps:
s01, providing waste incineration bottom ash, carrying out magnetic separation, and then naturally weathering and air-drying to obtain waste incineration bottom ash particles;
s02, screening the garbage incineration bottom ash particles through a 4.75mm sieve, taking the garbage incineration bottom ash particles above the 4.75mm sieve, and leaving the bottom ash with the particle size of below 4.75mm to obtain standby bottom ash; the bottom ash with the grain diameter of less than 4.75mm can be directly used as fine aggregate to be applied to engineering.
S03, putting the standby bottom ash into a jaw crusher to crush large-particle bottom ash in the standby bottom ash into small-particle bottom ash, carrying out magnetic separation and ball milling treatment on the small-particle bottom ash, and sieving the small-particle bottom ash by a 150-micron sieve to obtain bottom ash micro powder; specifically, the bottom ash can be ground into bottom ash powder by rotating for 30min at the rotating speed of 350rad/min, so that the specific surface area of the bottom ash is increased, and the bottom ash has higher reaction activity.
S04, mixing and stirring undisturbed phosphogypsum, fly ash, the bottom ash micro powder and sodium hydroxide, placing for 48 hours in an environment with the temperature of 30 ℃ and the relative humidity of more than 95%, and then placing into a drying oven with the temperature of 60 ℃ for drying for 24 hours to obtain the modified phosphogypsum;
s05, the pH value of the modified phosphogypsum is more than or equal to 7.5; the water content of the modified phosphogypsum is less than or equal to 15 percent, and the water-soluble phosphorus pentoxide is less than or equal to 0.2 percent.
Referring to fig. 3, in one embodiment of the present invention, the preparation method of the modified phosphogypsum cement comprises the following steps:
step S001, providing waste incineration bottom ash, carrying out magnetic separation, and then naturally weathering and air drying to obtain waste incineration bottom ash particles;
step S002, screening the waste incineration bottom ash particles through a 4.75mm sieve, taking the waste incineration bottom ash particles above the 4.75mm sieve, and leaving the bottom ash with the particle size of below 4.75mm for later use;
step S003, throwing the garbage incineration bottom ash particles into a jaw crusher, and crushing the large bottom ash particles into small particles; carrying out magnetic separation and ball milling treatment on the small-particle bottom ash, and sieving the small-particle bottom ash by a sieve of 150 mu m to obtain bottom ash micro powder;
and step S004, stirring the bottom ash micro powder, the modified phosphogypsum, the cement and the mineral admixture, then performing ball milling and mixing, and levigating to obtain the modified phosphogypsum cement.
The method realizes the expansion of a bottom ash utilization channel and the improvement of the utilization rate of the phosphogypsum, realizes the full-particle-size utilization of the bottom ash, forms the effective treatment of the waste incineration bottom ash, improves the utilization rate of the phosphogypsum in road materials, protects the environment and saves resources.
It should be noted that, in the specific embodiment of the present invention, the specific content of each component is preferably determined by using a calculation method specified in "4, mix composition design" according to the requirements of design strength and the like in JTGTF20-2015 highway base course construction technology, and the components are preferably mixed by using a mixing method specified in "5, mix production, spreading and rolling".
Example 3
In one embodiment of the invention, the cement-stabilized phosphogypsum bottom ash gravel for the road base comprises the following components in percentage by mass: 0 part of modified phosphogypsum, 1293 parts of broken stone, 250 parts of stone chips, 104 parts of modified phosphogypsum cement, 542 parts of waste incineration fine bottom ash and 177 parts of water.
The modified phosphogypsum comprises the following components in percentage by mass: 80% of undisturbed phosphogypsum, 87% of CaSO4 and 3.2 of PH value; 10% of bottom ash micro powder, wherein the bottom ash micro powder is waste incineration bottom ash, magnetic separation is carried out, after natural weathering and air drying for 28 days, sieving and ball milling are carried out for 30min at the rotating speed of 350rad/min to obtain the bottom ash micro powder with the particle size of less than 150 mu m; 2% of sodium hydroxide; 8% of the fly ash is class F class II fly ash meeting ASTM C-618;
mixing and stirring undisturbed phosphogypsum, fly ash, bottom ash micro powder and sodium hydroxide, placing the mixture for 48 hours at the temperature of 30 ℃ and under the environment that the relative humidity is more than 95%, and then placing the mixture into a drying oven at the temperature of 60 ℃ for drying for 24 hours to obtain the modified phosphogypsum. The modified phosphogypsum has pH =8.5; the water content of the modified phosphogypsum is 12.5 percent, and the water-soluble phosphorus pentoxide is 0.0566 percent.
The modified phosphogypsum cement comprises the following components in percentage by mass: 40% of modified phosphogypsum; 10% of cement, wherein the cement is P.O 42.5 ordinary Portland cement; 35% of mineral admixture, wherein the mineral admixture is S95-grade granulated blast furnace slag powder; 15% of bottom ash micro-powder, wherein the bottom ash micro-powder is waste incineration bottom ash, magnetic separation is carried out, after natural weathering and air drying for 28 days, sieving and ball milling are carried out for 30min at the rotating speed of 350rad/min to obtain the bottom ash micro-powder with the particle size of less than 150 mu m;
stirring the bottom ash micro powder, the modified phosphogypsum, the cement and the mineral admixture, then performing ball milling and mixing, and grinding to obtain the modified phosphogypsum cement, wherein the pH is =11.83, the 3-day compressive strength is 15.1Mpa, the 28-day compressive strength is 38.7Mpa, the 3-day flexural strength is 4.1Mpa, the 28-day flexural strength is 7.5Mpa, and the strength of the modified phosphogypsum cement meets the requirement of 32.5 grade cement of GB 175-2020 Universal Portland Cement specification.
In the invention, the crushed stone is graded crushed stone, and the crushed stone with the nominal grain diameter of 4.75-9.5 mm in the graded crushed stone is 32.26 percent by mass percent; 43.55 percent of broken stone with the nominal grain diameter of 9.5-19 mm; 24.19 percent of broken stone with the nominal grain diameter of 19-26.5 mm; the mass fraction of dust with the particle size of less than 0.075mm in the graded broken stone is 1.5%; the graded crushed stone had a crush value of 19.6%.
Based on the mass parts of the modified phosphogypsum, 250 parts of stone chips are included in the cement-stabilized phosphogypsum bottom ash broken stone. The passing rate of a 0.075mm sieve pore is 15%.
Based on the mass portion of the modified phosphogypsum, the cement-stabilized phosphogypsum bottom ash broken stone comprises 542 portions of bottom ash, and the particle size of the bottom ash is less than 4.75mm.
The cement-stabilized phosphogypsum bottom ash broken stone comprises 104 parts of cement, wherein the cement is modified phosphogypsum cement;
mixing the modified phosphogypsum, the broken stone, the stone chips, the garbage bottom ash and the fine bottom ash with water to obtain a mixture; the mixture is mixed with modified phosphogypsum cement to obtain cement-stabilized phosphogypsum bottom ash graded broken stone, and tests show that the maximum dry density is 2086kg/m & lt 3 & gt, the 7-day unconfined compressive strength of the broken stone is 3.71MPa on the average, the standard deviation is 0.36, the coefficient of variation Cv is 7.61%, and the representative value is 3.12MPa.
Example 4
In one embodiment of the invention, there is also provided a cement-stabilized phosphogypsum bottom ash macadam for a road substrate, comprising the following components in mass fraction: 127 parts of modified phosphogypsum, 1309 parts of broken stone, 127 parts of stone chips, 106 parts of modified phosphogypsum cement, 549 parts of waste incineration fine bottom ash and 192 parts of water.
The modified phosphogypsum comprises the following components in percentage by mass: 80% of undisturbed phosphogypsum, 87% of CaSO4 and 3.2 of PH value; the bottom ash is 10 percent, the bottom ash micro powder is the bottom ash of the garbage incineration, magnetic separation is carried out, after natural weathering and air drying for 28 days, sieving and ball milling are carried out for 30min at the rotating speed of 350rad/min, and the bottom ash micro powder with the particle size of less than 150 mu m is obtained; 2% of sodium hydroxide; 8% of the fly ash is F class II fly ash meeting ASTM C-618;
mixing and stirring undisturbed phosphogypsum, fly ash, bottom ash micro powder and sodium hydroxide, placing the mixture for 48 hours at the temperature of 30 ℃ and under the environment that the relative humidity is more than 95%, and then placing the mixture into a drying oven at the temperature of 60 ℃ for drying for 24 hours to obtain the modified phosphogypsum. The modified phosphogypsum has pH =8.5; the water content of the modified phosphogypsum is 12.5 percent, and the water-soluble phosphorus pentoxide is 0.0566 percent.
The modified phosphogypsum cement comprises the following components in percentage by mass: 40% of modified phosphogypsum; 10% of cement, wherein the cement is P.O 42.5 ordinary portland cement; 35% of mineral admixture, wherein the mineral admixture is S95-grade granulated blast furnace slag powder; 15% of bottom ash micro powder, namely refuse incineration bottom ash, carrying out magnetic separation, naturally weathering and air drying for 28 days, sieving and ball milling for 30min at the rotating speed of 350rad/min to obtain the bottom ash micro powder with the particle size of less than 150 mu m;
stirring the bottom ash micro powder, the modified phosphogypsum, the cement and the mineral admixture, then performing ball milling and mixing, and grinding to obtain the modified phosphogypsum cement, wherein the pH is =11.83, the 3-day compressive strength is 15.1Mpa, the 28-day compressive strength is 38.7Mpa, the 3-day flexural strength is 4.1Mpa, the 28-day flexural strength is 7.5Mpa, and the strength of the modified phosphogypsum cement meets the requirement of 32.5 grade cement of GB 175-2020 Universal Portland Cement specification.
In the invention, the crushed stone is graded crushed stone, and the crushed stone with the nominal grain diameter of 4.75-9.5 mm in the graded crushed stone is 32.26 percent by mass percent; 43.55 percent of broken stone with the nominal grain diameter of 9.5-19 mm; 24.19 percent of broken stones with the nominal grain diameter of 19-26.5 mm; the mass fraction of dust with the particle size of less than 0.075mm in the graded broken stone is 1.5%; the graded crushed stone has a crush value of 19.6%.
On the basis of the mass portion of the modified phosphogypsum, the cement-stabilized phosphogypsum bottom ash broken stone comprises 127 portions of stone chips. The passing rate of the 0.075mm sieve hole is 15%.
Based on the mass portion of the modified phosphogypsum, the cement-stabilized phosphogypsum bottom ash broken stone comprises 549 portions of bottom ash, and the particle size of the bottom ash is smaller than 4.75mm.
The cement-stabilized phosphogypsum bottom ash broken stone comprises 104 parts of cement, wherein the cement is modified phosphogypsum cement;
mixing the modified phosphogypsum, the broken stone, the stone chips, the garbage bottom ash and the fine bottom ash with water to obtain a mixture; the mixture is mixed with modified phosphogypsum cement to obtain cement-stabilized phosphogypsum bottom ash graded broken stone, and tests show that the maximum dry density is 2112kg/m < 3 >, the 7-day unconfined compressive strength of the cement-stabilized phosphogypsum bottom ash graded broken stone is 3.93MPa in average value, the standard deviation is 0.25, the coefficient of variation Cv is 5.61%, and the representative value is 3.51MPa.
Example 5
In one embodiment of the invention, there is also provided a cement-stabilized phosphogypsum bottom ash macadam for a road substrate, comprising the following components in mass fraction: 252 parts of modified phosphogypsum, 1304 parts of broken stone, 0 part of stone chips, 105 parts of modified phosphogypsum cement, 547 parts of waste incineration fine bottom ash and 200 parts of water.
The modified phosphogypsum comprises the following components in percentage by mass: 80% of undisturbed phosphogypsum, 87% of CaSO4 and 3.2 of PH value; the bottom ash is 10 percent, the bottom ash micro powder is the bottom ash of the garbage incineration, the magnetic separation is carried out, after the natural weathering and the air drying for 28 days, the sieving and the ball milling are carried out for 30min at the rotating speed of 350rad/min, and the bottom ash micro powder with the particle size of less than 150 mu m is obtained; 2% of sodium hydroxide; 8% of the fly ash is F class II fly ash meeting ASTM C-618;
mixing and stirring undisturbed phosphogypsum, fly ash, bottom ash micro powder and sodium hydroxide, placing for 48 hours in an environment with the temperature of 30 ℃ and the relative humidity of more than 95%, and then placing into a drying oven with the temperature of 60 ℃ for drying for 24 hours to obtain the modified phosphogypsum. The modified phosphogypsum has pH =8.5; the water content of the modified phosphogypsum is 12.5 percent, and the water-soluble phosphorus pentoxide is 0.0566 percent.
The modified phosphogypsum cement comprises the following components in percentage by mass: 40% of modified phosphogypsum; 10% of cement, wherein the cement is P.O 42.5 ordinary portland cement; 35% of mineral admixture, wherein the mineral admixture is S95-grade granulated blast furnace slag powder; 15% of bottom ash micro powder, namely refuse incineration bottom ash, carrying out magnetic separation, naturally weathering and air drying for 28 days, sieving and ball milling for 30min at the rotating speed of 350rad/min to obtain the bottom ash micro powder with the particle size of less than 150 mu m;
stirring the bottom ash micro powder, the modified phosphogypsum, the cement and the mineral admixture, then performing ball milling and mixing, and finely grinding to obtain the modified phosphogypsum cement, wherein the pH is =11.83, the 3-day compressive strength is 15.1mpa, the 28-day compressive strength is 38.7Mpa, the 3-day flexural strength is 4.1mpa, and the 28-day flexural strength is 7.5Mpa, and the strength of the modified phosphogypsum cement meets the requirement of 32.5-grade cement specified in GB 175-2020 general Portland Cement.
In the invention, the crushed stone is graded crushed stone, and the graded crushed stone contains 32.26 percent of crushed stone with the nominal grain diameter of 4.75-9.5 mm in percentage by mass; 43.55 percent of broken stone with the nominal grain diameter of 9.5-19 mm; 24.19 percent of broken stones with the nominal grain diameter of 19-26.5 mm; the mass fraction of dust with the particle size of less than 0.075mm in the graded broken stone is 1.5%; the graded crushed stone has a crush value of 19.6%.
Based on the mass parts of the modified phosphogypsum, the cement-stabilized phosphogypsum bottom ash broken stone comprises 547 parts of bottom ash, and the particle size of the bottom ash is less than 4.75mm.
The cement-stabilized phosphogypsum bottom ash broken stone comprises 105 parts of cement, wherein the cement is modified phosphogypsum cement;
mixing the modified phosphogypsum, the broken stone, the stone chips, the garbage bottom ash and the fine bottom ash with water to obtain a mixture; the mixture is mixed with modified phosphogypsum cement to obtain cement-stabilized phosphogypsum bottom ash graded broken stone, and tests show that the maximum dry density is 2112kg/m < 3 >, the 7-day unconfined compressive strength is 3.79MPa on the average, the standard deviation is 0.33, the coefficient of variation Cv is 7.25%, and the representative value is 3.25MPa.
Comparative example 1
The embodiment of the invention also provides cement-stabilized bottom ash macadam for a road base, which comprises the following components in percentage by mass: 1325 parts of broken stone, 256 parts of stone chips, 107 parts of cement, 556 parts of waste incineration fine bottom ash and 177 parts of water.
In the invention, the crushed stone is graded crushed stone, and the crushed stone with the nominal grain diameter of 4.75-9.5 mm in the graded crushed stone is 32.26 percent by mass percent; 43.55 percent of broken stone with the nominal grain diameter of 9.5-19 mm; 24.19 percent of broken stones with the nominal grain diameter of 19-26.5 mm; the mass fraction of dust with the particle size of less than 0.075mm in the graded broken stone is 1.5%; the graded crushed stone had a crush value of 19.6%.
The cement-stabilized phosphogypsum bottom ash broken stone comprises 556 parts of bottom ash, and the particle size of the bottom ash is less than 4.75mm.
The cement-stabilized bottom ash macadam comprises 107 parts of cement, wherein the cement is P.O 32.5 ordinary portland cement;
mixing the broken stone, the stone chips, the garbage bottom ash and the fine bottom ash with water to obtain a mixture; the mixture is mixed with cement to obtain cement stabilized bottom ash graded broken stone, and tests show that the maximum dry density is 2137kg/m & lt 3 & gt, the 7-day unconfined compressive strength is 3.66MPa on the average value, the standard deviation is 0.30, the coefficient of variation Cv is 6.41%, and the representative value is 3.17MPa.
It is obvious from the comparison of the above examples and comparative examples that the phosphogypsum bottom ash gravel for road base and the preparation method thereof provided by the invention improve the pH value of the phosphogypsum by modifying the phosphogypsum, so that the phosphogypsum is converted from the original acidic environment to the alkaline environment, and the alkaline environment is favorable for the hydration reaction. Secondly, soluble phosphorus and fluorine in the phosphogypsum are modified and neutralized to generate insoluble phosphate and calcium fluoride, and the influence of the soluble phosphorus and fluorine on cement retardation is removed. And secondly, the modified phosphorus stone reduces the influence on tricalcium aluminate in the cement hydration process, and generates more ettringite compared with the original phosphogypsum, so that the setting time is shortened, and the early strength is improved compared with the original strength. The bottom ash micro powder is used for replacing partial slag as a mineral admixture, so that a resource utilization channel of the coarse bottom ash for aggregate is developed; and because the bottom ash mineral components are similar to the slag mineral components, the bottom ash micro powder also has certain volcanic ash activity, and replaces partial slag as a mineral admixture to obviously reduce the cost and the consumed resources for producing cement. According to the invention, the fine bottom ash and the modified phosphogypsum are used for replacing the stone chips and are used as the fine aggregate of the cement stabilized macadam, so that on one hand, the exploitation of natural light aggregate is reduced, and resources can be effectively saved; on the other hand, the modified phosphogypsum has certain gelling activity, so that the action of waste replacement does not have great influence on the early strength of the cement stabilized macadam. The method realizes the expansion of a bottom ash utilization channel and the improvement of the utilization rate of the phosphogypsum, realizes the full-grain-size utilization of the bottom ash, forms the effective treatment of the waste incineration bottom ash, improves the utilization rate of the phosphogypsum in building materials, protects the environment and saves resources.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. The cement-stabilized phosphogypsum bottom ash gravel for the road base is characterized by comprising the following components in parts by mass: 0-400 parts of modified phosphogypsum, 1100-1400 parts of broken stone, 0-300 parts of stone chips, 73-120 parts of modified phosphogypsum cement, 250-850 parts of waste incineration fine bottom ash and 100-250 parts of water;
the modified phosphogypsum comprises the following components in percentage by mass: 80-90% of undisturbed phosphogypsum, 5-10% of bottom ash, 1-2% of sodium hydroxide and 3-10% of fly ash.
2. The cement-stabilized phosphogypsum bottom ash macadam for road bed according to claim 1, characterized in that the CaSO4 in the undisturbed phosphogypsum is more than or equal to 80%; the pH value is more than or equal to 2.5.
3. The cement stabilized phosphogypsum bottom ash macadam for road underlayment of claim 1, characterized in that the fly ash in the modified phosphogypsum is class F class II fly ash.
4. The cement stabilized phosphogypsum bottom ash macadam for road pavements according to claim 1, characterized in that the modified phosphogypsum cement comprises the following components in mass fraction: 35-50% of modified phosphogypsum, 5-10% of cement, 30-40% of mineral admixture and 10-20% of bottom ash micro powder.
5. The cement stabilized phosphogypsum bottom ash macadam for road bed according to claim 1, characterized in that the modified phosphogypsum cement pH should be between 10.0 to 12.5.
6. The cement stabilized phosphogypsum bottom ash macadam for road base course according to claim 1, characterized in that the cement is portland cement.
7. The cement-stabilized phosphogypsum bottom ash macadam for road substrates according to claim 1, characterized in that the mineral admixture is slag and the macadam is graded, and in the graded macadam, 24.19-38.71% of macadam with nominal grain size of 4.75-9.5 mm, 35.48-54.84% of macadam with nominal grain size of 9.5-19 mm and 20.97-29.03% of macadam with nominal grain size of 19-26.5 mm are calculated by mass percentage; the mass fraction of dust with the particle size of less than 0.075mm in the graded broken stone is not more than 2%; the crushing value of the graded broken stone is less than or equal to 26 percent.
8. The cement stabilized phosphogypsum bottom ash macadam for road pavements according to claim 1, characterized in that the stone chips 0.075mm mesh passage does not exceed 20%.
9. The cement stabilized phosphogypsum bottom ash macadam for road pavements according to claim 1, characterized in that the refuse incinerated bottom ash fine bottom ash particle size is less than 4.75mm.
10. A method of producing a cement stabilized phosphogypsum marl stone for road substrates, according to any of claims 1 to 9, for the production of a cement stabilized phosphogypsum marl stone for road substrates, comprising the steps of:
mixing the modified phosphogypsum, the broken stone, the stone chips, the waste incineration bottom ash and the fine bottom ash with water to obtain a mixture;
and mixing the mixture with the modified phosphogypsum cement to obtain the cement-stabilized phosphogypsum bottom ash graded broken stone.
11. The method of making cement stabilized phosphogypsum bottom ash macadam for road pavements according to claim 10, characterized in that it comprises the following steps:
providing waste incineration bottom ash, carrying out magnetic separation, and then naturally weathering and air drying to obtain waste incineration bottom ash particles;
sieving the garbage incineration bottom ash particles by a 4.75mm sieve, taking the garbage incineration bottom ash particles above the 4.75mm sieve, and leaving the bottom ash with the particle size of below 4.75mm for later use;
putting the garbage incineration bottom ash particles into a jaw crusher, and crushing large bottom ash particles into small particles; carrying out magnetic separation and ball milling treatment on the small-particle bottom ash, and sieving the small-particle bottom ash by a sieve of 150 mu m to obtain bottom ash micro powder;
stirring the bottom ash micro powder, the modified phosphogypsum, the cement and the mineral admixture, then performing ball milling and mixing, and levigating to obtain the modified phosphogypsum cement.
12. The method of preparing a cement stabilized phosphogypsum bottom ash macadam for road pavements according to claim 10, characterized in that it comprises the following steps:
providing waste incineration bottom ash, carrying out magnetic separation, and then naturally weathering and air drying to obtain waste incineration bottom ash particles;
sieving the garbage incineration bottom ash particles by a 4.75mm sieve, taking the garbage incineration bottom ash particles above the 4.75mm sieve, and leaving the bottom ash with the particle size of below 4.75mm to obtain standby bottom ash; (ii) a
Putting the standby bottom ash into a jaw crusher to crush large-particle bottom ash in the standby bottom ash into small-particle bottom ash, performing magnetic separation and ball milling treatment on the small-particle bottom ash, and sieving the small-particle bottom ash by a 150-micron sieve to obtain bottom ash micro powder;
mixing and stirring undisturbed phosphogypsum, fly ash, the bottom ash micro powder and sodium hydroxide, placing for 48 hours in an environment with the temperature of 30 ℃ and the relative humidity of more than 95%, and then placing into a drying oven with the temperature of 60 ℃ for drying for 24 hours to obtain the modified phosphogypsum;
the pH value of the modified phosphogypsum is more than or equal to 7.5; the water content of the modified phosphogypsum is less than or equal to 15 percent, and the water-soluble phosphorus pentoxide is less than or equal to 0.2 percent.
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