CN114213045A - Phosphogypsum-based cement based on industrial waste and preparation method thereof - Google Patents
Phosphogypsum-based cement based on industrial waste and preparation method thereof Download PDFInfo
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- CN114213045A CN114213045A CN202111538257.9A CN202111538257A CN114213045A CN 114213045 A CN114213045 A CN 114213045A CN 202111538257 A CN202111538257 A CN 202111538257A CN 114213045 A CN114213045 A CN 114213045A
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- 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 89
- 239000004568 cement Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000002440 industrial waste Substances 0.000 title claims abstract description 12
- 239000002893 slag Substances 0.000 claims abstract description 31
- 239000000843 powder Substances 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 235000019738 Limestone Nutrition 0.000 claims abstract description 11
- 239000006028 limestone Substances 0.000 claims abstract description 11
- 239000000654 additive Substances 0.000 claims abstract description 9
- 108010064851 Plant Proteins Proteins 0.000 claims abstract description 8
- 230000000996 additive effect Effects 0.000 claims abstract description 8
- 235000021118 plant-derived protein Nutrition 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 7
- 239000004576 sand Substances 0.000 claims abstract description 6
- 238000009837 dry grinding Methods 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 108010082495 Dietary Plant Proteins Proteins 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 3
- 238000000498 ball milling Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 11
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract description 10
- 239000002910 solid waste Substances 0.000 abstract description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 7
- 239000011574 phosphorus Substances 0.000 abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 7
- 239000011398 Portland cement Substances 0.000 abstract description 5
- 229910000147 aluminium phosphate Inorganic materials 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- 239000000463 material Substances 0.000 description 17
- 239000011083 cement mortar Substances 0.000 description 9
- 239000010440 gypsum Substances 0.000 description 8
- 229910052602 gypsum Inorganic materials 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 6
- 238000006703 hydration reaction Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 230000036571 hydration Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 4
- 238000005345 coagulation Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 235000018102 proteins Nutrition 0.000 description 4
- 108090000623 proteins and genes Proteins 0.000 description 4
- 102000004169 proteins and genes Human genes 0.000 description 4
- 230000000979 retarding effect Effects 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 239000013522 chelant Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000001238 wet grinding Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 150000003140 primary amides Chemical class 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003334 secondary amides Chemical class 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 235000019830 sodium polyphosphate Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 210000004127 vitreous body Anatomy 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
- C04B11/266—Chemical gypsum
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention discloses phosphogypsum-based cement based on industrial waste and a preparation method thereof. The phosphogypsum-based cement comprises the following components in percentage by mass: dry grinding and drying 45% of phosphogypsum, 35% of granulated blast furnace slag powder, 10% of converter steel slag, 10% of limestone, 3.0% of glue-sand ratio and 0.5% of water-solid ratio, wherein the additive plant protein is added according to 0.5% of the mass of the phosphogypsum; wherein the mass percent of the dry-ground and dried phosphogypsum is calculated according to the effective content of the phosphogypsum contained in the dry-ground and dried phosphogypsum. The method can improve the utilization rate of the solid waste phosphogypsum generated in the production process of the phosphoric acid industry, has positive significance for controlling the total phosphorus pollution of Yangtze river basin, and provides a partial substitute for the traditional portland cement with high pollution and high energy consumption to a certain extent.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to phosphogypsum-based cement based on industrial byproducts and a preparation method thereof.
Background
The phosphogypsum-based cement is a hydraulic cementing material with higher strength, which is prepared by taking phosphogypsum as a main material, properly adding raw materials such as granulated blast furnace slag powder, converter steel slag, limestone and the like and taking vegetable protein and the like as additives. By adding the vegetable protein chemical reagent into the phosphogypsum-based composite cementing material, the purpose of shortening the setting time of the phosphogypsum-based composite cementing material is achieved, and the application of the phosphogypsum-based composite cementing material in actual engineering is guaranteed.
Phosphogypsum is a solid waste produced in the process of wet-process phosphoric acid production in the phosphoric acid industry, usually exists in the form of calcium sulfate dihydrate, and about 4.5-5.5 tons of phosphogypsum are discharged per 1 ton of phosphoric acid produced. The annual emission of the phosphogypsum all over the world exceeds 3 hundred million tons, the annual emission of the phosphogypsum in China also reaches 8000 million tons, but the utilization rate is less than 20 percent. In 2006, phosphogypsum is listed as a dangerous solid waste by the national environmental protection agency, and the ministry of ecological environment gives a directive again to actively treat industrial wastes represented by phosphogypsum and the like in Yangtze river drainage basins to solve the total phosphorus pollution of the Yangtze river by the ministry of ecological environment in 2019.
Currently, commonly adopted pretreatment methods such as alkali neutralization and acid washing need to carry out the steps of water washing, filtering, low-temperature drying, distilled water/deionized water filtering, natural drying and the like for many times, and the method is complex in process, high in cost and not suitable for industrial popularization. The invention adopts the conventional portland cement manufacturing process, and has simple operation and low cost.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of phosphogypsum-based cement based on industrial byproducts aiming at the defects in the prior art, which can effectively improve the utilization rate of the phosphogypsum and is beneficial to comprehensive treatment and efficient utilization of the industrial byproducts and wastes such as the phosphogypsum.
The technical scheme adopted by the invention for solving the problems is as follows:
the phosphogypsum-based cement comprises a phosphogypsum-based cementing material, an additive and water, and is characterized in that the phosphogypsum-based cement comprises the following components in percentage by mass: 45% of dry-ground and dried phosphogypsum, 35% of granulated blast furnace slag powder, 10% of converter steel slag, 10% of limestone, 3.0% of glue-sand ratio and 0.5% of water-solid ratio, wherein the additive plant protein is added according to 0.5% of the mass of the phosphogypsum.
According to the scheme, the particle size of the slag powder is mainly distributed between 1 and 20 mu m.
According to the scheme, the preparation method of the wet-grinding modified phosphogypsum slurry comprises the following steps: grinding the phosphogypsum, granulating the blast furnace slag powder, limestone and steel slag according to the mass ratio of 45:35:10:10, the water-solid ratio of 0.5 and the glue-sand ratio of 3.0, drying the phosphogypsum at 70 ℃ for later use, and ensuring that the pH value of the phosphogypsum slurry is more than or equal to 7 when the phosphogypsum, the granulated blast furnace slag powder, the limestone and the steel slag are used. Wherein, the particle size of the phosphogypsum is mainly distributed between 10 and 110 mu m.
The preparation method of the phosphogypsum-based cement adopts the wet-ground modified phosphogypsum slurry, then slag powder and cement are added according to the mixing proportion of the phosphogypsum-based cementing material, and an additive and water are added at the same time, and the mixture is stirred, paved and molded to obtain the phosphogypsum-based cement.
Compared with the prior art, the invention has the beneficial effects that:
the method can improve the utilization rate of the solid waste phosphogypsum generated in the production process of the phosphoric acid industry, has positive significance for controlling the total phosphorus pollution of Yangtze river basin, and provides a partial substitute for the traditional portland cement with high pollution and high energy consumption to a certain extent.
Drawings
FIG. 1 is a flow chart of a preparation process of a phosphogypsum-based cement mortar test piece.
Detailed Description
In order to better understand the present invention, the following examples are included to further illustrate the present invention.
In the following examples, the preparation method of the dry-milled phosphogypsum raw material comprises the following steps: adding the powder materials into a grinding mill container according to the mass ratio of the phosphogypsum to the granulated blast furnace slag powder to the converter steel slag to the limestone of 45:35:10:10 and the water-solid ratio of 0.5, carrying out ball milling for 40min at the rotating speed of 40r/min, pouring out the ball-milled raw materials, and sealing and storing for later use.
In the following examples, the dry-milled phosphogypsum raw material is placed in an oven to be dried at 70 ℃ for about 6 hours, and then is stored in a sealing way for later use.
In the following examples phosphogypsum powder with a particle size distribution of 10-110 μm is used.
In the following embodiment, the preparation method of phosphogypsum-based cement mortar adopts the dry grinding and drying of the phosphogypsum raw materials, then granulated blast furnace slag powder, steel slag and limestone are added according to the mixing proportion, vegetable protein with the mass of phosphogypsum being 0.5 percent and water with the water-cement ratio being 0.5 are added, and the mixture is placed in a standard cement mortar stirrer for stirring and compacting.
In the examples described below, phosphogypsum-based cement mortars were poured into standard triple trial moulds of 40mm x 160 mm. And placing the test mold and the test piece in a standard curing box with constant temperature of 20 ℃ and humidity of 95% for curing for 48h for molding, then removing the mold, naturally curing the test piece to different specified ages (3 days, 7 days and 28 days) and testing the mechanical properties of the phosphogypsum-based cement mortar test piece.
FIG. 1 shows the preparation steps of phosphogypsum-based cement mortar test pieces.
In the following examples, the standard compressive strength and flexural strength of the phosphogypsum-based cement mortar test pieces were tested in accordance with GB/T17671-1999 "Cement mortar Strength test method (ISO method)" shown in Table 1.
TABLE 1 compressive strength and flexural strength of ardealite-based cement mortar cured to different ages
As can be seen from Table 1, the phosphogypsum-based cement prepared by taking industrial wastes such as phosphogypsum, granulated blast furnace slag powder, converter steel slag and the like as raw materials has better mechanical properties, and basically reaches the strength level of P.O 42.5.5-grade cement.
The cement has good mortar strength, wherein the 7d unconfined compressive strength is not less than 12 MPa; the 28d strength is not less than 36 MPa.
Compared with the cement coagulation with sodium hydroxide added externally, the initial coagulation and final coagulation time of the cement are obviously improved; the initial setting time is reduced from 125min to 95 min; the final setting time is reduced from 300min to 170 min.
The invention takes wet-grinding modified phosphogypsum slurry, slag powder and portland cement as main raw materials to prepare phosphogypsum-based cement. Wherein, the phosphogypsum is wrapped by hydration products in the modification process, so that air hardening materials are changed into hydraulic materials, and a large amount of dihydrate gypsum is attached to the crystal surface in the phosphogypsum, so that the phosphogypsum has a retarding effect on a cement stabilizing layer and is beneficial to construction. The cement stabilizing layer adopting the phosphogypsum-based cementing material can effectively prolong the construction setting time, and is beneficial to the construction of a pavement base layer; in addition, the cement stabilizing layer is a semi-rigid cement stabilizing layer, so that the load borne by the pavement base layer can be buffered, the stress concentration is reduced, the crack resistance of the pavement is increased, and the service life of the road is prolonged.
The invention adopts a large amount of industrial solid waste, and can reduce the pollution problem of the industrial solid waste to the environment, and the problems of higher consumption, higher storage, preparation and feeding cost of the traditional admixture such as sodium hydroxide and the like. Proteins, which are organic substances widely existing in nature, may have a good effect on solving the above problems. On one hand, the compound can be combined with soluble impurities such as phosphorus, fluorine and the like and does not react with hydration products (the long-term strength is influenced by the traditional impurity removal method such as directly adding NaOH, NaHCO3 and the like), and on the other hand, vegetable proteins and the like are low in cost and easy to obtain.
The traditional admixture (alkaline chemical material) has the characteristics of strong irritation and corrosivity to the environment, such as the large heat release of sodium hydroxide when meeting water and water vapor to form corrosive solution. And the catalyst reacts with acid in a neutralization reaction and releases heat, and has strong corrosiveness. And the vegetable protein is relatively environment-friendly and safe.
The ardealite-based composite cementing material is doped with a strong alkaline plant protein chemical reagent, so that the hydration of a cementing material system can be promoted, OH < - > generated by dissolving plant protein in water can obviously increase the alkalinity of a pore solution, and the disintegration of superfine blast furnace slag vitreous bodies is accelerated, so that the hydration reaction of slag is promoted, the setting time of the ardealite-based composite cementing material can be obviously shortened, and the early strength is improved.
The plant protein gypsum retarder has good retarding effect, and can obviously prolong the setting time of gypsum at a lower mixing amount. The retarding time is uniformly changed along with the addition amount of the retarder, and the phenomenon of insensitivity to the addition amount or sudden change does not occur, so that the performance is convenient for adjusting the setting time of the gypsum and easy to control the production.
The most obvious advantages of the plant protein gypsum retarder are as follows: under the condition of same retardation time, the gypsum strength loss rate of the retarder is far less than that of the other two. When the delayed coagulation time reaches 2 hours, the loss rate of the compressive strength is only 16.7 percent, and the loss rates of the citric acid and the sodium polyphosphate to the strength of the gypsum exceed 50 percent under the same condition.
The protein retarder can generate chelate with calcium ions to delay the setting time of the building gypsum, and the retarding effect of the chelate generated by the secondary amide and the calcium ions is better than that of the chelate generated by the primary amide and the calcium ions.
The invention uses a large amount of industrial solid waste, can reduce the problem of environmental pollution caused by the industrial solid waste, has simple preparation process and wide raw material sources, and can have better effect on solving the problem by using the protein as an organic matter widely existing in the nature. On one hand, the compound can be combined with soluble impurities such as phosphorus, fluorine and the like and does not react with hydration products (the long-term strength is influenced by the traditional impurity removal method such as directly adding NaOH, NaHCO3 and the like), and on the other hand, vegetable proteins and the like are low in cost and easy to obtain.
In conclusion, the invention provides a hydraulic cementing material which takes phosphogypsum, slag powder and other industrial byproducts as main raw materials and takes plant protein as a main additive, namely phosphogypsum-based cement. The cement comprises the following raw materials in percentage by mass: 45 percent of dry grinding and drying phosphogypsum raw material (calculated by the effective content of the phosphogypsum contained in the phosphogypsum raw material), 35 percent of granulated blast furnace slag powder, 10 percent of converter steel slag, 10 percent of limestone, 3.0 percent of glue-sand ratio and 0.5 percent of water-solid ratio, and the additive vegetable protein is added according to 0.5 percent of the mass of the phosphogypsum. The cement has good working performance and mechanical property, wherein the 7d compressive mortar strength is not less than 12 MPa; the 28d strength is not less than 35 MPa. The invention uses a large amount of industrial solid waste, can reduce the problem of environmental pollution caused by the industrial solid waste, has simple preparation process, wide raw material sources and lower operation cost, and the protein serving as an organic matter widely existing in the nature possibly has better effect on solving the problem. On one hand, the compound can be combined with soluble impurities such as phosphorus, fluorine and the like and does not react with hydration products (the long-term strength is influenced by the traditional impurity removal method such as directly adding NaOH, NaHCO3 and the like), and on the other hand, vegetable proteins and the like are low in cost and easy to obtain. The phosphogypsum-based cement can partially replace the traditional portland cement to a certain extent. The invention has positive significance for comprehensive treatment and utilization of industrial wastes such as phosphogypsum and the like, treatment of total phosphorus pollution of Yangtze river basin and development of novel hydraulic cementing materials.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and changes can be made without departing from the inventive concept of the present invention, and these modifications and changes are within the protection scope of the present invention.
Claims (6)
1. The phosphogypsum-based cement based on industrial waste is characterized by comprising the following components in percentage by mass: dry grinding and drying 45% of phosphogypsum, 35% of granulated blast furnace slag powder, 10% of converter steel slag, 10% of limestone, 3.0% of glue-sand ratio and 0.5% of water-solid ratio, wherein the additive plant protein is added according to 0.5% of the mass of the phosphogypsum; wherein the mass percent of the dry-ground and dried phosphogypsum is calculated according to the effective content of the phosphogypsum contained in the dry-ground and dried phosphogypsum.
2. The industrial waste-based phosphogypsum-based cement according to claim 1, characterized in that the preparation method of the dry-milled and dried phosphogypsum is as follows: ball milling is carried out according to the phosphogypsum, and the ball milled raw materials are poured out and dried at 70 ℃.
3. The industrial waste based phosphogypsum-based cement according to claim 1 or 2, characterized in that the particle size distribution of the granulated blast furnace slag powder is between 1 and 20 μm.
4. The industrial waste based phosphogypsum-based cement according to claim 1 or 2, characterized in that the dry-ground dried phosphogypsum has a particle size distribution comprised between 10 and 110 μm.
5. The preparation method of the phosphogypsum-based cement based on the industrial waste is characterized in that according to the mixing proportion of the phosphogypsum-based cement raw material as claimed in any one of claims 1 to 4, granulated blast furnace slag powder, converter steel slag and limestone are added into the dry-ground dried phosphogypsum raw material, and water and additive vegetable protein are simultaneously added to prepare the phosphogypsum-based cement.
6. The preparation method of the phosphogypsum-based cement based on the industrial waste, as claimed in claim 5, is characterized in that the phosphogypsum, the granulated blast furnace slag powder, the limestone and the steel slag are ground and dried at 70 ℃ for later use according to the mass ratio of 45:35:10:10, the water-solid ratio of 0.5 and the glue-sand ratio of 3.0, and the pH value of the phosphogypsum slurry is more than or equal to 7 when in use.
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| CN115959844A (en) * | 2023-02-07 | 2023-04-14 | 康达(湖南)水泥有限公司 | Method for preparing cement by using phosphogypsum |
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