CN114507025A - Deep processing method of desulfurized gypsum - Google Patents

Deep processing method of desulfurized gypsum Download PDF

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Publication number
CN114507025A
CN114507025A CN202210167574.2A CN202210167574A CN114507025A CN 114507025 A CN114507025 A CN 114507025A CN 202210167574 A CN202210167574 A CN 202210167574A CN 114507025 A CN114507025 A CN 114507025A
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CN
China
Prior art keywords
gypsum
treatment
desulfurized
beta
desulfurized gypsum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210167574.2A
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Chinese (zh)
Inventor
崔焕民
白玉勇
汪作胜
谷小兵
杨文圣
李广林
赵允涛
隗永涛
李文龙
魏新
种潇
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Datang Environment Industry Group Co Ltd
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Datang Environment Industry Group Co Ltd
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Publication date
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Priority to CN202210167574.2A priority Critical patent/CN114507025A/en
Publication of CN114507025A publication Critical patent/CN114507025A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B11/00—Calcium sulfate cements
    • C04B11/02—Methods and apparatus for dehydrating gypsum
    • C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
    • C04B11/036—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained for the dry process, e.g. dehydrating in a fluidised bed or in a rotary kiln, i.e. to obtain beta-hemihydrate
    • 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
    • C04B11/007—After-treatment of the dehydration products, e.g. aging, stabilisation
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
    • C04B28/147—Calcium sulfate hemi-hydrate with a specific crystal form beta-hemihydrate
    • 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 deep processing method of desulfurized gypsum, which comprises the following steps: s1, dehydrating the desulfurized gypsum to dehydrate calcium sulfate dihydrate to prepare beta-type semi-hydrated gypsum; s2, cooling the dehydrated beta-type semi-hydrated gypsum, and then carrying out modification treatment; and S3, adding a mixed material into the modified beta-hemihydrate gypsum to prepare gypsum mortar or gypsum self-leveling. The invention can make the desulfurized gypsum lose water to form beta gypsum powder building gypsum, reduce the water content of the desulfurized gypsum and the concentration of chloride ions in the desulfurized gypsum, ensure that the particle size of the finished product gypsum powder is small and uniform, and can be deeply processed to generate the product gypsum mortar or gypsum self-leveling. The method of the invention realizes the development and utilization of the byproduct desulfurization gypsum in the desulfurization industry.

Description

Deep processing method of desulfurized gypsum
Technical Field
The invention relates to the technical field of environmental protection engineering, in particular to a deep processing method of desulfurized gypsum.
Background
The desulfurized gypsum is a solid waste generated in the production process after the desulfurization of the boiler flue gas, and is a harmful solid waste which not only pollutes the above-ground environment, but also directly pollutes underground water resources if meeting rainwater.
The desulfurized gypsum is generally in the form of powder, slurry-like with 15-30% of adhering water, and has a particle diameter of generally 5-150 μm and a main component of CaSO4、2H20, generally up to about 70 to 90%, wherein the minor components contained therein vary depending on the source of the ore, and are complex, generally containing rock components, Ca, Mg desulfates, carbonates and silicates, and in addition, containing small amounts of organic sulfur, sulfur and fluorine compounds. The desulfurized gypsum is generally gray yellow, gray yellow, light yellow and other colors, the relative density is 2.22 to 2.37, and the volume weight is 0.733 to 0.880g/cm3. The desulfurized gypsum contains more chemical components, so that the utilization difficulty of the desulfurized gypsum is increased, only a few parts of the desulfurized gypsum are used as soil conditioners for improving soil or are used as production raw materials after primary treatment in certain areas with deficient gypsum resources, the desulfurized gypsum which is digested by the simpler treatment or utilization modes and is deposited and accumulated like a mountain in a desulfurization enterprise year by year is undoubtedly paid in a cupped waterwheel, and the treatment mode has almost no economic benefit, and simultaneously generates a large amount of waste water which is difficult to treat in the treatment process, so the problem cannot be fundamentally solved.
Desulfurized gypsum is a resource waste residue having gypsum characteristics, and is to be developed and utilized to the maximum extent according to its own characteristics and market demands.
Disclosure of Invention
The invention provides a deep processing method for treating and utilizing desulfurized gypsum.
The invention provides a deep processing method of desulfurized gypsum, which comprises the following steps: s1, dehydrating the desulfurized gypsum to dehydrate calcium sulfate dihydrate to prepare beta-type semi-hydrated gypsum; s2, cooling the dehydrated beta-type semi-hydrated gypsum, and then carrying out modification treatment; and S3, adding a mixed material into the modified beta-hemihydrate gypsum to prepare gypsum mortar or gypsum self-leveling.
Further, the dehydration treatment in S1 includes a pre-drying treatment and a fluidized calcination treatment.
Further, the temperature of the fluidization calcination treatment is 107-170 ℃.
Further, the pre-drying treatment adopts a tube bundle type or blade type dryer, and the fluidized calcining treatment adopts a single chamber calciner or a compartment calciner.
Further, the modification treatment in S2 is a grinding modification treatment.
Further, the grinding modification treatment grinds the construction gypsum into powder having a particle size of less than 200 μm.
Further, in S3, the mixed material includes cement, sand, and vitrified micro bubbles.
Further, in S3, the mixed material includes cement, calcium powder, and vitrified micro bubbles.
Further, the mixed material also comprises a composite retarder.
Furthermore, the addition amount of the composite retarder is 0.2% -5%.
Compared with the prior art, the invention has the beneficial effects that: the method can ensure that the desulfurized gypsum loses water to form beta gypsum powder building gypsum, reduce the water content of the desulfurized gypsum and the concentration of chloride ions in the desulfurized gypsum, ensure that the particle size of the finished product gypsum powder is small and uniform, and can be deeply processed to generate the product gypsum mortar or gypsum self-leveling.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method for further processing desulfurized gypsum according to an embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment of the invention provides a deep processing method of desulfurized gypsum, which comprises the following steps as shown in figure 1:
s1, dehydrating the desulfurized gypsum to dehydrate calcium sulfate dihydrate to prepare beta-type semi-hydrated gypsum. The dehydration treatment comprises the following steps: pre-drying treatment and fluidization calcining treatment. The temperature of the fluidized calcination treatment is 107-170 ℃. Specifically, the gypsum raw material enters a pre-drying system through belt conveying equipment for pre-drying treatment to remove most of free water, and then enters a fluidized calcinator, the temperature of a bed layer is stabilized at 107-170 ℃, 1.5 crystal water molecules of dihydrate gypsum are removed, and the final beta-type hemihydrate gypsum is obtained. When the temperature is too high, overburning can occur to form anhydrous gypsum, the temperature is unstable, different crystals can be formed, the quality and the performance of finished products are different, and therefore the temperature of steam entering the box body of the calcinator needs to be strictly controlled. The reaction equation is CaSO4·2H2O＝CaSO4·1/2H2O (beta form) +3/2H2And O. Preferably, the predrying treatment adopts a tube bundle type or paddle type dryer, and the fluidized calcining treatment adopts a single chamber calciner or a compartment calciner.
And S2, cooling the dehydrated beta-hemihydrate gypsum, and then carrying out modification treatment. The modification treatment is grinding modification treatment, and the grinding modification treatment is used for grinding the building gypsum into powder with the particle size of less than 200 mu m. Specifically, after the product comes out of the calcinator, the product firstly enters a cooling bin and then enters a mixing modification system for grinding modification treatment, the building gypsum is ground into powder with the particle size of less than 200 mu m, so that the mechanical property of the product is improved, and finally the product is conveyed to a finished product storage bin to be prepared into the beta gypsum.
And S3, adding a mixed material into the modified beta-hemihydrate gypsum to prepare gypsum mortar or gypsum self-leveling. Wherein the mixed material comprises cement, sand and vitrified micro bubbles, or comprises cement, calcium powder and vitrified micro bubbles. Specifically, the prepared beta gypsum is conveyed to a deep processing storage bin through pneumatic conveying and is mixed with mixed materials according to different strength requirements of mortar in proportion, and the industrial standard has requirements on the strength of the mortar, so that the beta gypsum needs to be proportioned according to the requirements of the industrial standard in proportion. Meanwhile, some composite retarders can be added, the increment is 0.2-5%, and the setting speed and strength of the mortar are further improved, so that gypsum mortar or gypsum self-leveling products of gypsum deep processing products are prepared.
The method can ensure that the desulfurized gypsum loses water to form the beta gypsum powder building gypsum, reduce the water content of the desulfurized gypsum and the concentration of chloride ions in the desulfurized gypsum, ensure that the particle size of the finished product gypsum powder is small and uniform, and can be deeply processed to generate the product gypsum mortar or gypsum self-leveling.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The method for deep processing of desulfurized gypsum is characterized by comprising the following steps:
s1, dehydrating the desulfurized gypsum to dehydrate calcium sulfate dihydrate to prepare beta-type semi-hydrated gypsum;
s2, cooling the dehydrated beta-type semi-hydrated gypsum, and then carrying out modification treatment;
and S3, adding a mixed material into the modified beta-hemihydrate gypsum to prepare gypsum mortar or gypsum self-leveling.
2. The method as claimed in claim 1, wherein the dehydration treatment in S1 comprises: pre-drying treatment and fluidized calcining treatment.
3. The method for further processing the desulfurized gypsum according to claim 2, wherein the temperature of the fluidized calcination treatment is 107 ℃ to 170 ℃.
4. The method for further processing the desulfurized gypsum according to claim 2, wherein the predrying treatment adopts a tube bundle type or paddle type dryer, and the fluidized calcining treatment adopts a single chamber calciner or a divided chamber calciner.
5. The method as claimed in claim 1, wherein the modification treatment is grinding modification treatment in S2.
6. The method for further processing the desulfurized gypsum according to claim 5, wherein the grinding modification treatment is carried out to grind the building gypsum into powder with the particle size of less than 200 μm.
7. The method of claim 1, wherein the mixture includes cement, sand and vitrified micro bubbles in S3.
8. The method of claim 1, wherein the mixture includes cement, calcium powder and vitrified micro bubbles in S3.
9. The method as claimed in any one of claims 7 or 8, wherein the mixed material further comprises a composite retarder.
10. The method for further processing the desulfurized gypsum according to claim 9, wherein the addition amount of the composite retarder is 0.2-5%.
CN202210167574.2A 2022-02-23 2022-02-23 Deep processing method of desulfurized gypsum Pending CN114507025A (en)

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Application Number Priority Date Filing Date Title
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102863197A (en) * 2012-09-13 2013-01-09 上海宇培特种建材有限公司 Desulfurization gypsum-based thermal insulation mortar and preparation method thereof
CN103833309A (en) * 2014-01-02 2014-06-04 武汉理工大学 Desulfurized gypsum-based heat-preserving moisture-adjusting plastering gypsum material
CN106517980A (en) * 2016-11-11 2017-03-22 上海宇培特种建材有限公司 Environment-friendly FGD (flue gas desulfurization) gypsum internal wall thermal insulation material and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102863197A (en) * 2012-09-13 2013-01-09 上海宇培特种建材有限公司 Desulfurization gypsum-based thermal insulation mortar and preparation method thereof
CN103833309A (en) * 2014-01-02 2014-06-04 武汉理工大学 Desulfurized gypsum-based heat-preserving moisture-adjusting plastering gypsum material
CN106517980A (en) * 2016-11-11 2017-03-22 上海宇培特种建材有限公司 Environment-friendly FGD (flue gas desulfurization) gypsum internal wall thermal insulation material and preparation method thereof

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Application publication date: 20220517

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