CN112760716A - Phosphorus-containing desulfurized gypsum recycling treatment method - Google Patents
Phosphorus-containing desulfurized gypsum recycling treatment method Download PDFInfo
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- CN112760716A CN112760716A CN202110053761.3A CN202110053761A CN112760716A CN 112760716 A CN112760716 A CN 112760716A CN 202110053761 A CN202110053761 A CN 202110053761A CN 112760716 A CN112760716 A CN 112760716A
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- phosphorus
- calcium sulfate
- desulfurized gypsum
- gypsum
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- 239000010440 gypsum Substances 0.000 title claims abstract description 69
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 69
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 239000011574 phosphorus Substances 0.000 title claims abstract description 43
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004064 recycling Methods 0.000 title claims abstract description 11
- 239000013078 crystal Substances 0.000 claims abstract description 32
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims abstract description 24
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 10
- WHUUTDBJXJRKMK-VKHMYHEASA-N L-glutamic acid Chemical compound OC(=O)[C@@H](N)CCC(O)=O WHUUTDBJXJRKMK-VKHMYHEASA-N 0.000 claims abstract description 10
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 5
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 5
- 239000008367 deionised water Substances 0.000 claims abstract description 5
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 5
- 229960002989 glutamic acid Drugs 0.000 claims abstract description 5
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 5
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims abstract description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 5
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000006477 desulfuration reaction Methods 0.000 claims description 14
- 230000023556 desulfurization Effects 0.000 claims description 14
- 239000012535 impurity Substances 0.000 claims description 14
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 239000003546 flue gas Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000000706 filtrate Substances 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 abstract 1
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulfur dioxide Inorganic materials O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 9
- 238000001878 scanning electron micrograph Methods 0.000 description 6
- 239000003245 coal Substances 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/46—Sulfur-, selenium- or tellurium-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/60—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape characterised by shape
- C30B29/62—Whiskers or needles
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B7/00—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
- C30B7/10—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions by application of pressure, e.g. hydrothermal processes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to a phosphorus-containing desulfurized gypsum recycling method, which comprises the steps of adding phosphorus-containing desulfurized gypsum and hydrochloric acid with certain concentration and sodium sulfate solution into an oil bath pot in a certain sequence, keeping a certain temperature, fully stirring for a period of time, filtering and drying to obtain dephosphorized calcium sulfate dihydrate whiskers; adding the prepared dephosphorized calcium sulfate dihydrate crystal whisker, a certain amount of deionized water, a mixture of L-glutamic acid and amino polyethylene glycol carboxyl into a three-necked flask, stirring for a period of time at a certain temperature, filtering and drying to obtain the calcium sulfate hemihydrate crystal whisker with the length-diameter ratio of 80: 1-120: 1. The phosphorus-containing desulfurized gypsum provided by the invention is prepared into calcium sulfate hemihydrate whiskers with wide industrial application by using the phosphorus-containing desulfurized gypsum which is difficult to treat, and the method is simple and low in cost.
Description
Technical Field
The invention relates to the field of phosphorus-containing desulfurization gypsum reutilization, in particular to a phosphorus-containing desulfurization gypsum reutilization treatment method.
Background
SO generated by human life, production, manufacture, combustion of sulfur-containing fuels and discharged into the air2Up to 2 hundred million and more tons per year, wherein flue gas SO generated by coal-fired power plant coal-fired power generation2The emission accounts for SO2About half of the total emission and a large amount of SO2The serious acid rain causes great damage to the environment, the economic development and the like, and reduces the emission and SO2Further pollution of coal fired power plants began to install flue gas desulfurization units.
In the energy structure of China, coal accounts for about 70% of the application amount. And China is in and will be in a period of taking coal as main energy for a long time at present, and the sulfur content of the coal in China is high, which directly leads to high sulfur dioxide emission in China. Therefore, in order to reduce the emission of sulfur dioxide, more and more coal-fired power plants adopt a wet limestone-gypsum method for flue gas desulfurization, although the emission of sulfur dioxide is controlled, the yield of desulfurized gypsum is increased sharply, and the yield of desulfurized gypsum reaches 75.1Mt by 2018. Therefore, how to improve the utilization rate of the desulfurized gypsum is proposed. By 2018, the utilization rate of the desulfurized gypsum reaches 75.4%, but more than 20% of the gypsum can not be effectively utilized, and a large amount of flue gas desulfurized gypsum is accumulated like a mountain, so that a large amount of land is occupied, and secondary pollution is easily caused.
At present, the following uses of the desulfurized gypsum are mainly available in China: (1) desulfurized gypsum is used as a cement retarder instead of natural gypsum; (2) preparing the desulfurized gypsum into building gypsum and products thereof; (3) improving the alkaline soil by using desulfurized gypsum; (4) producing a fertilizer by using desulfurized gypsum; (5) the desulfurized gypsum is used for preparing the high-strength gypsum. However, the desulfurized gypsum contains many impurities, is dark yellow in color (see figure 1) and is in a random granular shape (see figure 2), and the phosphogypsum (see figure 3) enables the desulfurized gypsum not to well exert the performance in the recycling process, so that the application of the desulfurized gypsum as an engineering raw material is limited. In order to better develop green economy, greatly realize solid waste utilization and sustainable development, and simultaneously improve the ecological environment, the phosphorus-containing desulfurized gypsum is treated, and the recycling way of the phosphorus-containing desulfurized gypsum is explored, so that the phosphorus-containing desulfurized gypsum is changed into valuables.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for recycling and treating phosphorus-containing desulfurized gypsum so as to solve the problems in the technical background.
The purpose of the invention is realized by the following technical scheme:
a phosphorus-containing desulfurized gypsum recycling treatment method comprises a phosphorus-containing desulfurized gypsum impurity removal method and a calcium sulfate hemihydrate whisker preparation method;
the phosphorus-containing desulfurization gypsum impurity removal method comprises the following steps:
s1, drying the phosphorus-containing release gypsum in an oven, grinding into powder,
s2, preparing 100-120ml of 2.5-3mol/L hydrochloric acid solution in a beaker, placing the beaker in an oil bath kettle at 95-98 ℃ to stir for 5min, adding 10g of phosphorus-containing desulfurization gypsum, dropwise adding 75-80ml of 0.9-1mol/L sodium sulfate solution, stirring for 3-3.5h when the temperature of the solution in the beaker is raised to the temperature of the oil bath kettle, filtering the solution after the reaction is finished, and placing the filtrate at room temperature to cool until calcium sulfate dihydrate crystal whiskers are separated out;
and S3, filtering the solution again to obtain calcium sulfate dihydrate crystal whiskers, putting the calcium sulfate dihydrate crystal whiskers into a 60 ℃ oven for drying for 4 hours, cooling and then putting into a sealing bag.
The preparation method of the calcium sulfate hemihydrate crystal whisker comprises the following steps:
(1) adding 2-3g of calcium sulfate dihydrate crystal whisker, 25-30ml of deionized water, 25-40ml of glycerol, 0.015-0.025g of L-glutamic acid and 0.01-0.015g of amino polyethylene glycol carboxyl into a three-neck flask, placing the three-neck flask into an oil bath kettle at 95 ℃, heating to 95 ℃, and stirring at constant temperature for 9 hours;
(2) and filtering the solution, and drying the filter residue in an oven at 60 ℃ to obtain the pure fine needle-shaped calcium sulfate hemihydrate crystal whisker with the length-diameter ratio of 80: 1-120: 1.
Further, the phosphorus-containing desulfurization gypsum is generated by a flue gas desulfurization process of a coal-fired power plant by using a gypsum method.
The invention has the beneficial effects that:
(1) compared with the prior art, the method adopts a hydrothermal method to prepare the calcium sulfate dihydrate crystal whisker and carries out filtering and drying, is simple, well removes phosphorus-containing impurities, and obtains the pure calcium sulfate dihydrate crystal whisker.
(2) On the basis of the obtained calcium sulfate dihydrate crystal whisker, the calcium sulfate hemihydrate crystal whisker with the length-diameter ratio of 80: 1-120: 1 is obtained under the normal-pressure non-acid medium environment.
(3) The method is used for treating the phosphorus-containing desulfurized gypsum, can improve the reutilization rate of the phosphorus-containing desulfurized gypsum, is favorable for improving the problem of environmental pollution caused by phosphorus-containing desulfurized gypsum accumulation, promotes the development of green economy and realizes sustainable development.
Drawings
FIG. 1 is a diagram of a phosphorus-containing desulfurized gypsum material in the background art of the present invention;
FIG. 2 is an SEM image of a phosphorus-containing desulfurized gypsum feedstock according to the background of the invention;
FIG. 3 is an XRD pattern of a phosphodesulfurized gypsum source of the background of the invention;
FIG. 4 is a diagram of a desulfurized gypsum sample after removal of impurities according to an embodiment of the present invention;
FIG. 5 is an SEM image of desulfurized gypsum with impurities removed according to an embodiment of the invention;
FIG. 6 is an XRD pattern of desulfurized gypsum with impurities removed according to an example of the invention;
FIG. 7 is an SEM image of calcium sulfate hemihydrate whiskers in an example of the invention;
figure 8 is an SEM image of calcium sulfate hemihydrate whiskers in an example of the invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
The first embodiment is as follows:
2. a phosphorus-containing desulfurized gypsum recycling treatment method is characterized by comprising a phosphorus-containing desulfurized gypsum impurity removal method and a calcium sulfate hemihydrate whisker preparation method;
the phosphorus-containing desulfurization gypsum impurity removal method comprises the following steps:
s1, drying the phosphorus-containing release gypsum in an oven, grinding into powder,
s2, preparing 100ml of 3mol/L hydrochloric acid solution in a beaker, placing the beaker in an oil bath kettle at 95 ℃, stirring for 5min, adding 10g of phosphorus-containing desulfurized gypsum, dropwise adding 80ml of 0.9mol/L sodium sulfate solution, stirring for 3h when the temperature of the solution in the beaker is raised to 95 ℃, filtering the solution after the reaction is finished, and placing the filtrate at room temperature to cool until calcium sulfate dihydrate crystal whiskers are separated out;
and S3, filtering the solution again to obtain calcium sulfate dihydrate crystal whiskers, putting the calcium sulfate dihydrate crystal whiskers into a 60 ℃ oven for drying for 4 hours, cooling and then putting into a sealing bag.
Referring to fig. 4, the treated desulfurized gypsum is pure white in color and presents a uniform narrow long flake shape (referring to fig. 5), and XRD pattern analysis (referring to fig. 6) shows that the product has no phosphate diffraction peak, compared with the diffraction peak of the raw material, the diffraction peak of the treated product is greatly reduced, and impurity components are effectively removed. Similar to the diffraction peak of calcium sulfate dihydrate on the standard PDF card, the prepared whisker is proved to be calcium sulfate dihydrate.
The preparation method of the calcium sulfate hemihydrate crystal whisker comprises the following steps:
(1) 2g of calcium sulfate dihydrate crystal whisker, 25ml of deionized water, 25ml of glycerol, 0.015g of L-glutamic acid and 0.01g of amino polyethylene glycol carboxyl are added into a three-necked flask, placed into an oil bath kettle at the temperature of 95 ℃, heated to 95 ℃, and stirred at constant temperature for 9 hours;
(2) and filtering the solution, and drying the filter residue in an oven at 60 ℃, as shown in figure 7, to obtain the pure fine needle-shaped calcium sulfate hemihydrate crystal whisker with the length-diameter ratio of 80: 1-120: 1.
Specifically, referring to an SEM image of the calcium sulfate hemihydrate crystal whisker shown in the attached figure 8, the comparison of the SEM image with a diffraction peak of calcium sulfate hemihydrate on a standard PDF card proves that the prepared crystal whisker is calcium sulfate hemihydrate with the length-diameter ratio of 80: 1-120: 1.
Example two:
a phosphorus-containing desulfurized gypsum recycling treatment method comprises a phosphorus-containing desulfurized gypsum impurity removal method and a calcium sulfate hemihydrate whisker preparation method;
the phosphorus-containing desulfurization gypsum impurity removal method comprises the following steps:
s1, drying the phosphorus-containing release gypsum in an oven, grinding into powder,
s2, preparing 120ml of 2.5mol/L hydrochloric acid solution in a beaker, placing the beaker in an oil bath kettle at 98 ℃, stirring for 5min, adding 10g of phosphorus-containing desulfurized gypsum, dropwise adding 75ml of 1mol/L sodium sulfate solution, stirring for 3.5h when the temperature of the solution in the beaker is raised to 98 ℃, filtering the solution after the reaction is finished, and placing the filtrate at room temperature to cool until calcium sulfate dihydrate crystal whiskers are separated out;
and S3, filtering the solution again to obtain calcium sulfate dihydrate crystal whiskers, putting the calcium sulfate dihydrate crystal whiskers into a 60 ℃ oven for drying for 4 hours, cooling and then putting into a sealing bag.
The preparation method of the calcium sulfate hemihydrate crystal whisker comprises the following steps:
(1) adding 3g of calcium sulfate dihydrate crystal whisker, 30ml of deionized water, 40ml of glycerol, 0.025g of L-glutamic acid and 0.015g of amino polyethylene glycol carboxyl into a three-necked flask, placing the three-necked flask in an oil bath kettle at 95 ℃, heating to 95 ℃, and stirring at constant temperature for 9 hours;
(2) filtering the solution, and drying the filter residue in an oven at 60 ℃ to obtain pure fine needle-shaped calcium sulfate hemihydrate crystal whisker with the length-diameter ratio of 80: 1-120: 1
It should be further explained in the above embodiments that, in the above embodiments, the phosphorus-containing desulfurized gypsum is the phosphorus-containing desulfurized gypsum produced by flue gas desulfurization process of coal-fired power plants by using gypsum method.
The above-mentioned embodiments only express the specific 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.
Claims (2)
1. A phosphorus-containing desulfurized gypsum recycling treatment method is characterized by comprising a phosphorus-containing desulfurized gypsum impurity removal method and a calcium sulfate hemihydrate whisker preparation method;
the phosphorus-containing desulfurization gypsum impurity removal method comprises the following steps:
s1, drying the phosphorus-containing release gypsum in an oven, grinding into powder,
s2, preparing 100-120ml of 2.5-3mol/L hydrochloric acid solution in a beaker, placing the beaker in an oil bath kettle at 95-98 ℃ to stir for 5min, adding 10g of phosphorus-containing desulfurization gypsum, dropwise adding 75-80ml of 0.9-1mol/L sodium sulfate solution, stirring for 3-3.5h when the temperature of the solution in the beaker is raised to the temperature of the oil bath kettle, filtering the solution after the reaction is finished, and placing the filtrate at room temperature to cool until calcium sulfate dihydrate crystal whiskers are separated out;
and S3, filtering the solution again to obtain calcium sulfate dihydrate crystal whiskers, putting the calcium sulfate dihydrate crystal whiskers into a 60 ℃ oven for drying for 4 hours, cooling and then putting into a sealing bag.
The preparation method of the calcium sulfate hemihydrate crystal whisker comprises the following steps:
(1) adding 2-3g of calcium sulfate dihydrate crystal whisker, 25-30ml of deionized water, 25-40ml of glycerol, 0.015-0.025g of L-glutamic acid and 0.01-0.015g of amino polyethylene glycol carboxyl into a three-neck flask, placing the three-neck flask into an oil bath kettle at 95 ℃, heating to 95 ℃, and stirring at constant temperature for 9 hours;
(2) and filtering the solution, and drying the filter residue in an oven at 60 ℃ to obtain the pure fine needle-shaped calcium sulfate hemihydrate crystal whisker with the length-diameter ratio of 80: 1-120: 1.
2. The method for recycling and treating the phosphorus-containing desulfurized gypsum according to claim 1, wherein the phosphorus-containing desulfurized gypsum is generated by flue gas desulfurization process of coal-fired power plants by using a gypsum method.
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| CN114438597A (en) * | 2021-12-31 | 2022-05-06 | 佛山市中医院 | Tissue engineering polyester composite scaffold material with calcium sulfate enhanced in-situ solidification pore-forming function and preparation method and application thereof |
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| CN114438597A (en) * | 2021-12-31 | 2022-05-06 | 佛山市中医院 | Tissue engineering polyester composite scaffold material with calcium sulfate enhanced in-situ solidification pore-forming function and preparation method and application thereof |
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