CN117985995A - Method for preparing high-strength fiber gypsum board by using phosphogypsum - Google Patents
Method for preparing high-strength fiber gypsum board by using phosphogypsum Download PDFInfo
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- CN117985995A CN117985995A CN202410032198.5A CN202410032198A CN117985995A CN 117985995 A CN117985995 A CN 117985995A CN 202410032198 A CN202410032198 A CN 202410032198A CN 117985995 A CN117985995 A CN 117985995A
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 151
- 239000010440 gypsum Substances 0.000 title claims abstract description 151
- 239000000835 fiber Substances 0.000 title claims abstract description 111
- 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 77
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000000203 mixture Substances 0.000 claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000012423 maintenance Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 239000002002 slurry Substances 0.000 claims description 25
- 238000003756 stirring Methods 0.000 claims description 19
- 238000000748 compression moulding Methods 0.000 claims description 13
- 239000004743 Polypropylene Substances 0.000 claims description 9
- 239000002270 dispersing agent Substances 0.000 claims description 9
- -1 polypropylene Polymers 0.000 claims description 9
- 229920001155 polypropylene Polymers 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 abstract description 17
- 238000002360 preparation method Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract description 4
- 239000004566 building material Substances 0.000 abstract description 3
- 239000002910 solid waste Substances 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 238000005266 casting Methods 0.000 description 11
- 230000036571 hydration Effects 0.000 description 8
- 238000006703 hydration reaction Methods 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 238000005507 spraying Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 229910017053 inorganic salt Inorganic materials 0.000 description 3
- 241000132536 Cirsium Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 239000011426 gypsum mortar Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention relates to the field of solid waste recycling and the technical field of building material production, in particular to a method for preparing a high-strength fiber gypsum board by using phosphogypsum. A method for preparing a high-strength fiber gypsum board by using phosphogypsum comprises the following preparation methods: s1, parching beta-phosphogypsum hemihydrate; s2, preparing fiber pulp; s3, preparing a wet gypsum mixture; s4, pressing and forming; s5, natural maintenance. The flexural strength of the gypsum board obtained by the preparation method can reach more than 12MPa, the flexural strength of the gypsum board is obviously improved compared with that of a conventional fiber gypsum board, and the gypsum board can be packaged and put in storage without drying treatment in the preparation process, so that the production is completed, the drying energy consumption cost is saved, and the production cost is reduced.
Description
Technical Field
The invention relates to the field of solid waste recycling and the technical field of building material production, in particular to a method for preparing a high-strength fiber gypsum board by using phosphogypsum.
Background
Phosphogypsum is a large amount of solid waste, and is usually deposited in open air, so that the ecological environment problem of soil pollution and groundwater pollution exists. Phosphogypsum is used as a raw material to produce various building materials, such as gypsum boards, gypsum laths, gypsum blocks, plastering gypsum, self-leveling gypsum mortar and the like, so that the ecological environment problem of phosphogypsum can be effectively solved.
Active gypsum boards can be generally classified into fibrous gypsum boards and paper gypsum boards.
When phosphogypsum is used for producing the fiber gypsum board, a casting method process is generally adopted, namely, beta-semi-hydrated phosphogypsum obtained through frying is matched with fibers, auxiliary raw materials and the like, water is added and stirred into gypsum slurry, and finally, the fiber gypsum board is obtained after casting molding, drying and drying. To further improve the toughness and structural stability of the fibrous gypsum board, gypsum slurry, with or without fibers, may also be cast onto the fibrous web to form a fibrous gypsum board having a gypsum core in between and a fibrous web on both sides. The main disadvantage of the casting method for producing fiber gypsum board is that firstly, after casting and forming, gypsum slurry containing a large amount of water needs to be dried in time, and a large amount of energy is consumed; secondly, the strength of the produced fiber gypsum board is lower. Although alpha-hemihydrate phosphogypsum (also called high-strength phosphogypsum powder) can be used as a raw material to improve the strength of the fiber gypsum board, the raw material cost is greatly improved compared with commonly used beta-hemihydrate phosphogypsum (also called common phosphogypsum powder).
When phosphogypsum is used for producing the paper-surface gypsum board, in the drying process of the paper-surface gypsum board, soluble inorganic salt impurities contained in phosphogypsum are brought to the interface between the gypsum core and the paper surface by moisture from gypsum slurry to form an inorganic salt layer, so that the adhesive property of the paper surface and the gypsum core is affected, and the paper surface is fallen off when serious, and waste products are generated. The solution idea is to wash phosphogypsum for desalination pretreatment, but the production cost is increased, and the desalination wastewater is required to be subjected to harmless treatment. On the other hand, the mechanical strength of the gypsum plasterboard is low. Therefore, the phosphogypsum is used for preparing the thistle board, and the thistle board has the defects of easy falling off of paper surface and lower strength.
In order to solve the defects of paper surface falling and low strength in phosphogypsum production of paper surface gypsum boards, the invention patent No. ZL202011133791.7 'a method for preparing a paper surface-free and fiber-free high-strength gypsum board by using phosphogypsum' provides a product system and a production process of the paper surface-free high-strength gypsum board. However, the process has two working sections of water spraying hydration and drying, namely, a large amount of excessive water sprayed during water spraying hydration is timely removed through heating and drying, and the process has the defects of high drying energy consumption, complex drying equipment system, high operation difficulty and the like. In addition, the gypsum board produced by the process has high strength, but is influenced by the substance structure and the intrinsic physical characteristics of the gypsum because the material composition is only gypsum, and the gypsum board has high brittleness, poor toughness and poor impact resistance, and has high breakage rate when the product is assembled, disassembled, transported and used in engineering.
Disclosure of Invention
In view of this, the present invention provides a process for producing a high-strength fibrous gypsum board using phosphogypsum as a main raw material.
A method for preparing high-strength fiber gypsum board by using phosphogypsum, which comprises the following steps: parching Gypsum Fibrosum to obtain beta-semi-hydrated phosphogypsum; adding polypropylene fibers into water, stirring and scattering, adding beta-phosphogypsum hemihydrate as a dispersing agent, and continuously stirring and scattering to form fiber slurry; adding the fiber slurry into beta-phosphogypsum hemihydrate, and rapidly and uniformly stirring to form a wet gypsum mixture; and (3) sequentially carrying out compression molding, demolding and natural curing on the wet gypsum mixture to obtain the high-strength fiber gypsum board.
Further, the dosage ratio of the first doped beta-semi-hydrated phosphogypsum to the second doped beta-semi-hydrated phosphogypsum is 15:85 by taking the mass parts as the basis.
Further, the method specifically comprises the following steps:
S1, parching raw phosphogypsum to obtain beta-semi-hydrated phosphogypsum;
s2, preparing fiber pulp: adding 0.2-0.5 part by mass of polypropylene fiber into 15-20 parts by mass of water, scattering, adding 15 parts by mass of beta-phosphogypsum as a dispersing agent, and continuously stirring and scattering to obtain fiber slurry;
S3, preparing a wet gypsum mixture: putting 85 parts by mass of beta-phosphogypsum into a stirrer, starting the stirrer, pouring all the fiber slurry prepared in the step S2, and continuing stirring until the materials are uniformly mixed to obtain a wet gypsum mixture;
s4, press forming: filling the wet gypsum mixture into a mould of a hydraulic press, starting the hydraulic press, performing compression molding, and demolding to obtain a fiber gypsum board blank;
S5, natural maintenance: and (3) placing the fiber gypsum board blank on a horizontal roller conveyor, and after a period of operation, completing the natural curing process, packaging and warehousing to obtain the high-strength fiber gypsum board.
Further, in S1, the raw phosphogypsum is fried at 150-180 ℃ under normal pressure to obtain the beta-semi-hydrated phosphogypsum.
In S4, the pressure condition for pressing and forming the wet gypsum mixture is 10-25 MPa.
Further, in S5, the time condition for natural curing is 30min.
Preferably, for S1, it is noted that the phosphogypsum is industrial waste gypsum containing more than 80wt% of calcium sulfate dihydrate. For natural gypsum, desulfurized gypsum and the like, the steps of the invention can be used for producing high-strength fiber gypsum boards by experiments on the basis of properly adjusting process parameters. For other chemical fibers and natural fibers, the steps of the invention can be adopted to produce the high-strength fiber gypsum board after the process parameters are adjusted through process tests.
For S2, if the beta-semi-hydrated phosphogypsum is not doped as a dispersing agent of the fiber slurry, even if the fiber is uniformly dispersed in water, when the fiber is added to the subsequent beta-semi-hydrated phosphogypsum, the fiber is easy to agglomerate, and in the finally formed wet gypsum mixture, the fiber and the beta-semi-hydrated phosphogypsum are unevenly mixed; on the contrary, when the method of the step S2 is adopted, the beta-semi-hydrated phosphogypsum is doped into a mixed system of the fiber and the water as a dispersing agent, and after continuous stirring, fiber gypsum slurry is formed, and when the slurry is added into the subsequent beta-semi-hydrated phosphogypsum, the fiber is not easy to agglomerate, a wet gypsum mixture with uniformly mixed fiber and beta-semi-hydrated phosphogypsum can be obtained, and finally, the fiber gypsum board with relatively uniform fiber dispersion can be obtained.
As for S5, compared with the invention ZL202011133791.7 'a method for preparing the paper-surface-free and fiber-free high-strength gypsum board by using phosphogypsum', the two process steps of water spraying hydration and drying are removed, and the fiber gypsum board blank is only required to run on a horizontal roller conveyor for 30min, so that a natural maintenance process is completed, and the fiber gypsum board product can be prepared. The reason for the improvement is that experimental researches show that the water consumption of the S2 step is strictly controlled, namely the water content of the wet gypsum mixture formed in the S3 step is strictly controlled, so that the water content of the wet gypsum mixture slightly exceeds the theoretical water content required by the hydration of the beta-phosphogypsum, and the beta-phosphogypsum can be completely hydrated by the aid of the diffusion effect of residual free moisture in the storage process of the later-stage product, namely the gelatinization effect of the beta-phosphogypsum can be fully exerted, and finally the high-strength fibrous gypsum board completely formed by the phosphogypsum is formed. Therefore, the water spraying hydration step of the ZL202011133791.7 can be omitted, and meanwhile, the necessity of subsequent drying is avoided.
In the step S5, it should also be noted that, compared with the invention ZL202011133791.7 "a method for preparing a paper-surface-free and fiber-free high-strength gypsum board by using phosphogypsum", the product can meet the strength requirements of product packaging and inventory operation without drying, because the early strength and toughness of the gypsum board blank are improved due to the addition of polypropylene fibers, for example, after the gypsum board blank is operated on a horizontal roller conveyor, i.e. naturally cured for 30min, the flexural strength (expressed as "breaking modulus") of the gypsum board blank can reach more than 6MPa, and the packaging strength requirement can be met. In contrast, in the invention ZL202011133791.7, as the water spraying hydration step is adopted, the product is in an over-wet state, the flexural strength is lower than 3MPa, if the product is not immediately dried, the early strength of the product is extremely low, and the product cannot be packaged; moreover, even though the packaging is barely completed by adopting fine operation, the product is in an excessively wet state for a long time, and has a swelling phenomenon, and after long-term storage, the strength of the product is lower, and the strength requirement of the product cannot be met.
The high-strength fiber gypsum board is prepared by the method for preparing the high-strength fiber gypsum board by using the phosphogypsum.
The technical scheme provided by the invention has the beneficial effects that: the method for preparing the high-strength fiber gypsum board by using phosphogypsum has the following beneficial effects:
(1) Compared with the existing casting method for producing the fiber gypsum board, the invention adopts a compression molding process, and the water quantity doped in the raw material treatment is far less than the water quantity doped in the casting method, so that after compression molding, the beta-semi-hydrated phosphogypsum is favorable for forming dihydrate gypsum crystals with high mutual combination degree and low porosity in the hydration process, and the mechanical strength of the fiber gypsum board is greatly improved. For example, the flexural strength (expressed by a "breaking modulus") of a conventional fiber gypsum board is generally about 5MPa, while the flexural strength (expressed by a "breaking modulus") of the fiber gypsum board produced by the method can reach 12MPa, which means that the high-strength fiber gypsum board can be produced by using only ordinary beta-hemihydrate phosphogypsum and fibers as raw materials without using high-strength alpha-hemihydrate phosphogypsum as raw materials or using other reinforcing agents;
(2) Compared with the existing casting method for producing the fiber gypsum board, the invention has the advantages that the water consumption is low and is only 15-20% of the total mass of the beta-semi-hydrated phosphogypsum, which is far lower than the water consumption of more than 60% used in the casting method for producing the fiber gypsum board when preparing gypsum slurry. After the fiber gypsum board blank is formed, the fiber gypsum board blank can be packaged and put in storage without drying treatment, so that the production is completed, the drying energy consumption cost is saved, and the production cost is reduced;
(3) Compared with the ZL202011133791.7 'a method for preparing the paper-free and fiber-free high-strength gypsum board by using phosphogypsum', the invention does not need to carry out water spraying hydration on a gypsum board blank, does not need to be dried, can save drying energy consumption and further greatly reduces production cost; in addition, the fiber gypsum board contains fibers, so that the toughness of the product can be greatly improved and the brittleness of the product can be reduced on the basis of maintaining the high strength of the product, and the breakage rate of the product in the processes of packaging, loading, unloading, transporting, engineering application and the like can be greatly reduced;
(4) The invention is similar to the method for preparing the paper-free and fiber-free high-strength gypsum board by using phosphogypsum, and the invention does not use paper surface protection and has no problem of falling off of paper surface from the gypsum board, so that the phosphogypsum does not need to be subjected to washing and desalting pretreatment, and the problems of influence of inorganic salt in the phosphogypsum on the preparation of the gypsum board and secondary environmental pollution of desalted wastewater are fundamentally solved.
Drawings
Fig. 1 is a flow chart of a method for preparing a high strength fiber gypsum board using phosphogypsum according to the present invention.
Detailed Description
The present invention is described in further detail below with reference to examples to enable those skilled in the art to practice the same by referring to the description.
The experimental methods described in the following embodiments are conventional methods unless otherwise indicated, and the reagents and materials are commercially available.
Example 1 ]
S1, parching raw phosphogypsum at 180 ℃ under normal pressure to obtain beta-semi-hydrated phosphogypsum;
S2, preparing fiber pulp: adding 0.3 part by mass of polypropylene fibers into 16 parts by mass of water, scattering, and continuously stirring and scattering 15 parts by mass of beta-phosphogypsum serving as a dispersing agent to obtain fiber slurry;
S3, preparing a wet gypsum mixture: putting 85 parts by mass of beta-phosphogypsum into a stirrer, starting the stirrer, pouring all the fiber slurry prepared in the step S2, and continuing stirring until the materials are uniformly mixed to obtain a wet gypsum mixture;
s4, press forming: filling the wet gypsum mixture into a mould of a hydraulic press, starting the hydraulic press, performing compression molding under the condition of 18MPa, and demolding to obtain a fiber gypsum board blank;
s5, natural maintenance: and (3) placing the fiber gypsum board blank on a horizontal roller conveyor, and after the operation is performed for 30min, completing the natural curing process, thus obtaining the high-strength fiber gypsum board, wherein the thickness of the product is 11mm.
The flexural strength (expressed as "modulus of rupture") of the high strength fibrous gypsum board prepared in this example was 13MPa.
Example 2]
S1, parching raw phosphogypsum at 180 ℃ under normal pressure to obtain beta-semi-hydrated phosphogypsum;
s2, preparing fiber pulp: adding 0.5 part by mass of polypropylene fibers into 20 parts by mass of water, scattering, and continuously stirring and scattering 15 parts by mass of beta-phosphogypsum serving as a dispersing agent to obtain fiber slurry;
S3, preparing a wet gypsum mixture: putting 85 parts by mass of beta-phosphogypsum into a stirrer, starting the stirrer, pouring all the fiber slurry prepared in the step S2, and continuing stirring until the materials are uniformly mixed to obtain a wet gypsum mixture;
S4, press forming: filling the wet gypsum mixture into a mould of a hydraulic press, starting the hydraulic press, performing compression molding under the condition of 25MPa, and demolding to obtain a fiber gypsum board blank;
S5, natural maintenance: and (3) placing the fiber gypsum board blank on a horizontal roller conveyor, and after the operation is performed for 30min, completing the natural curing process to obtain the high-strength fiber gypsum board, wherein the thickness of the product is 10mm.
The flexural strength (expressed as "modulus of rupture") of the high strength fibrous gypsum board prepared in this example was 15MPa.
Example 3 ]
S1, parching raw phosphogypsum at 180 ℃ under normal pressure to obtain beta-semi-hydrated phosphogypsum;
s2, preparing fiber pulp: adding 0.2 part by mass of polypropylene fibers into 15 parts by mass of water, scattering, and continuously stirring and scattering 15 parts by mass of beta-phosphogypsum serving as a dispersing agent to obtain fiber slurry;
S3, preparing a wet gypsum mixture: putting 85 parts by mass of beta-phosphogypsum into a stirrer, starting the stirrer, pouring all the fiber slurry prepared in the step S2, and continuing stirring until the materials are uniformly mixed to obtain a wet gypsum mixture;
S4, press forming: filling the wet gypsum mixture into a mould of a conventional hydraulic press, starting the hydraulic press, performing compression molding under the condition of 20MPa, and demolding to obtain a fiber gypsum board blank;
S5, natural maintenance: and (3) placing the fiber gypsum board blank on a horizontal roller conveyor, and after the operation is performed for 30min, completing the natural curing process to obtain the high-strength fiber gypsum board, wherein the thickness of the product is 10.5mm.
The flexural strength (expressed as "modulus of rupture") of the high strength fibrous gypsum board prepared in this example was 12MPa.
Comparative example 1 ]
The traditional casting method is adopted as comparison, and the corresponding comparison product is prepared by the following steps:
s1, parching raw phosphogypsum at 180 ℃ under normal pressure to obtain beta-semi-hydrated phosphogypsum;
s2, preparing fiber gypsum slurry: adding 0.5 part by mass of polypropylene fibers into 70 parts by mass of water, scattering, adding 100 parts by mass of beta-phosphogypsum, and continuously stirring and scattering to obtain fiber gypsum slurry;
s3, casting and forming: pouring the fiber gypsum slurry into a mould with the depth of 10mm, naturally solidifying, and demoulding to obtain a wet fiber gypsum board blank;
s4, drying: and (5) placing the wet fiber gypsum board blank body in a blast drying oven to be dried at 45 ℃ to obtain the fiber gypsum board, wherein the thickness of the product is 10mm.
The comparative example is a conventional casting process, and the flexural strength (expressed as "modulus of rupture") of the prepared fibrous gypsum board is 5MPa, which is less than that of the gypsum board of example 2, indicating that the strength of the fibrous gypsum board prepared according to the invention is much greater than that of conventional fibrous gypsum boards.
Comparative example 2 ]
The compression molding process without adding fiber is adopted as comparison, and the corresponding comparison product is prepared by the following steps:
s1, parching raw phosphogypsum at 180 ℃ under normal pressure to obtain beta-semi-hydrated phosphogypsum;
s2, preparing a wet gypsum mixture: 100 parts by mass of beta-phosphogypsum hemihydrate is put into a stirrer, the stirrer is started, 15 parts by mass of water is poured into the stirrer, and stirring is continued until the materials are uniformly mixed, so that a wet gypsum mixture is obtained;
s3, press forming: filling the wet gypsum mixture into a mould of a conventional hydraulic press, starting the hydraulic press, performing compression molding under the condition of 20MPa, and demolding to obtain a fiber-free gypsum board blank;
S4, natural maintenance: and (3) placing the fiber-free gypsum board blank body on a horizontal roller conveyor, and after the operation is performed for 30min, completing the natural curing process to obtain the fiber-free gypsum board, wherein the thickness of the product is 10.5mm.
The comparative example is a compression molding preparation method of a gypsum board without adding fibers, and the flexural strength (expressed by a "breaking modulus") of the prepared fiber-free gypsum board is 10MPa, which is smaller than that of the high-strength fiber gypsum board of example 3, and shows specific toughening and reinforcing effects of the fibers.
Claims (7)
1. A method for preparing a high-strength fiber gypsum board by using phosphogypsum, which is characterized by comprising the following steps: parching Gypsum Fibrosum to obtain beta-semi-hydrated phosphogypsum; adding polypropylene fibers into water, stirring and scattering, adding beta-phosphogypsum hemihydrate as a dispersing agent, and continuously stirring and scattering to form fiber slurry; adding the fiber slurry into beta-phosphogypsum hemihydrate, and rapidly and uniformly stirring to form a wet gypsum mixture; and (3) sequentially carrying out compression molding, demolding and natural curing on the wet gypsum mixture to obtain the high-strength fiber gypsum board.
2. The method for preparing high-strength fiber gypsum board by using phosphogypsum according to claim 1, wherein the dosage ratio of the first time of adding beta-hemihydrate phosphogypsum to the second time of adding beta-hemihydrate phosphogypsum is 15:85 in terms of parts by mass.
3. The method for preparing high-strength fiber gypsum board by using phosphogypsum according to claim 1, which comprises the following steps:
S1, parching raw phosphogypsum to obtain beta-semi-hydrated phosphogypsum;
s2, preparing fiber pulp: adding 0.2-0.5 part by mass of polypropylene fiber into 15-20 parts by mass of water, scattering, adding 15 parts by mass of beta-phosphogypsum as a dispersing agent, and continuously stirring and scattering to obtain fiber slurry;
S3, preparing a wet gypsum mixture: putting 85 parts by mass of beta-phosphogypsum into a stirrer, starting the stirrer, pouring all the fiber slurry prepared in the step S2, and continuing stirring until the materials are uniformly mixed to obtain a wet gypsum mixture;
s4, press forming: filling the wet gypsum mixture into a mould of a hydraulic press, starting the hydraulic press, performing compression molding, and demolding to obtain a fiber gypsum board blank;
S5, natural maintenance: and (3) placing the fiber gypsum board blank on a horizontal roller conveyor, and after a period of operation, completing the natural curing process, packaging and warehousing to obtain the high-strength fiber gypsum board.
4. The method for preparing high-strength fiber gypsum board by using phosphogypsum according to claim 3, wherein in S1, the raw phosphogypsum is fried at 150-180 ℃ under normal pressure to obtain beta-semi-hydrated phosphogypsum.
5. A method for producing a high-strength fiber gypsum board using phosphogypsum according to claim 3, wherein in S4, the pressure condition for compression molding of the wet gypsum mixture is 10 to 25MPa.
6.A method for producing a high-strength fiber gypsum board using phosphogypsum according to claim 3, wherein the natural curing time condition in S5 is 30min.
7. A high strength fiber gypsum board produced by the method for producing a high strength fiber gypsum board from phosphogypsum according to any one of claims 1 to 6.
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| CN202410032198.5A CN117985995A (en) | 2024-01-09 | 2024-01-09 | Method for preparing high-strength fiber gypsum board by using phosphogypsum |
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| CN202410032198.5A CN117985995A (en) | 2024-01-09 | 2024-01-09 | Method for preparing high-strength fiber gypsum board by using phosphogypsum |
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