CN111875273A - High-strength gypsum cementing material based on anhydrite and desulfurized beta powder and preparation method thereof - Google Patents

High-strength gypsum cementing material based on anhydrite and desulfurized beta powder and preparation method thereof Download PDF

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Publication number
CN111875273A
CN111875273A CN202010815101.XA CN202010815101A CN111875273A CN 111875273 A CN111875273 A CN 111875273A CN 202010815101 A CN202010815101 A CN 202010815101A CN 111875273 A CN111875273 A CN 111875273A
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Prior art keywords
anhydrite
strength gypsum
parts
strength
desulfurized
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CN202010815101.XA
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陈靓
陈甜甜
汤进
唐永波
万建东
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Jiangsu Efful Science And Technology Co ltd
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Jiangsu Efful Science And Technology Co ltd
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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
    • C04B11/06—Calcium sulfate cements starting from anhydrite
    • 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
    • C04B11/002—Mixtures of different CaSO4-modifications, e.g. plaster of Paris and anhydrite, used as cements
    • 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
    • C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
    • C04B11/264—Gypsum from the desulfurisation of flue gases

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a high-strength gypsum cementing material based on anhydrite and desulfurized beta powder and a preparation method thereof, wherein the high-strength gypsum cementing material comprises the following raw material components in parts by weight: 60-70 parts of high-strength gypsum, 5-35 parts of anhydrite and 5-35 parts of desulfurized beta powder; according to the invention, the anhydrite and the desulfurized beta powder with lower cost are doped, and other heating and pressurizing additional high-cost technologies are not used, so that powder with better performance can be obtained, the mechanical property of the high-strength gypsum cementing material prepared by the invention meets the conditions that the rupture strength is more than or equal to 5.0MPa after 2h and the drying compressive strength is more than or equal to 40.0MPa, the stockpiling condition of natural anhydrite and industrial phosphogypsum is relieved to a great extent, and the continuous utilization of resources is fully realized.

Description

High-strength gypsum cementing material based on anhydrite and desulfurized beta powder and preparation method thereof
Technical Field
The invention relates to a high-strength gypsum cementing material based on anhydrite and desulfurized beta powder and a preparation method thereof.
Background
The alpha high-strength gypsum is obtained by steaming and pressing natural dihydrate gypsum under the condition of saturated steam with certain pressure, the water requirement of the standard consistency is generally between 20 and 35 percent, and the alpha high-strength gypsum has the advantages of high hardness, high strength, good wear resistance and the like, and is widely applied to the industries of aviation, medical treatment, high-end manufacturing and the like. The alpha high-strength gypsum needs less water for hardening, releases low heat in the hydration process, has strength far higher than that of beta building gypsum, but has limited yield and higher price because the process is more complex, the yield is far less than that of the building gypsum and the production cost is higher. The existing specialization is mainly directed at the introduction of high-strength gypsum on a certain aspect, materials such as cement, slag and the like are introduced into the high-strength gypsum, a certain amount of additives are added to adjust the workability, and the performance of the product is improved by utilizing the gelling activity of the materials. Because the introduced components are too complex, when slag, fly ash and other substances are introduced, the whiteness of the product is easily reduced greatly, and when more high-strength gypsum is replaced, the strength is obviously reduced. The strength in the early stage of hydration is mainly derived from the hydration of high-strength gypsum, and appropriate substances such as slag and the like can only play a role of dilution, so that the early strength is low, in the later stage of hydration, active substances such as slag and the like can continuously react to improve the performance of a system, but Al released by the reaction of the active substances, an exciting agent and the gypsum can generate ettringite, and if the proportion is not proper, a large amount of ettringite can cause the system to expand, so that the problems of cracking, pulverization and the like are caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention solves the problems that: the invention provides a high-strength gypsum cementing material which can obtain higher strength in a short age when more than forty percent of high-strength gypsum is substituted, and has no problem of volume stability, thereby solving the problems that the early strength is poor and the system stability is possibly generated in the later period when more high-strength gypsum is substituted by the existing modified high-strength gypsum powder, and reducing the use cost.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a high-strength gypsum cementing material based on anhydrite and desulfurized beta powder comprises the following raw material components in parts by weight: 60-70 parts of high-strength gypsum, 5-35 parts of anhydrite and 5-35 parts of desulfurized beta powder.
Further, the feed comprises the following raw material components in parts by weight: 70 parts of high-strength gypsum, 10 parts of anhydrite and 20 parts of desulfurized beta powder.
Further, the feed comprises the following raw material components in parts by weight: 70 parts of high-strength gypsum, 15 parts of anhydrite and 15 parts of desulfurized beta powder.
Furthermore, the high-strength gypsum is alpha-type high-strength gypsum, and the breaking strength of 2 hours is more than or equal to 6.0Mpa, and the drying compressive strength is more than or equal to 50.0 Mpa.
Further, the anhydrite is natural anhydrite or commercially available anhydrite.
A preparation method of a high-strength gypsum cementing material based on anhydrite and desulfurized beta powder comprises the following steps:
s1, selecting high-strength gypsum: selecting high-strength gypsum powder, and meeting the requirements that the breaking strength is more than or equal to 6.0Mpa after 2 hours and the drying compressive strength is more than or equal to 50.0 Mpa;
s2, grinding anhydrite: carrying out ball milling on the anhydrite by adopting a planetary ball mill to ensure that the specific surface area is 1170-7000 cm2/g；
S3, mixing materials: and (3) uniformly mixing and stirring the high-strength gypsum powder, the ground anhydrite powder and the desulfurization beta powder to obtain the high-strength gypsum cementing material based on the anhydrite and the desulfurization beta powder.
Further, the high-strength gypsum powder in the step S1 is an α -type high-strength gypsum powder.
Further, in the step S2, the time for grinding the anhydrite is 0.1 to 2 hours.
The invention has the advantages of
The high-strength gypsum cementing material prepared by the invention has mechanical properties meeting the conditions that the rupture strength is more than or equal to 5.0MPa for 2h and the drying compressive strength is more than or equal to 40.0MPa, relieves the stockpiling condition of natural anhydrite and industrial byproduct phosphogypsum to a great extent, and fully realizes the continuous utilization of resources.
Detailed Description
The present invention will be described in further detail below.
Example 1
The high-strength gypsum cementing material of the embodiment comprises the following raw material components in parts by weight: 70 parts of alpha-type high-strength gypsum, 5 parts of anhydrite and 25 parts of desulfurized beta powder; the anhydrite is natural anhydrite which is ground for 10min and has a specific surface area of 1870cm2(ii)/g; the proportioning raw materials are uniformly mixed to obtain the low-cost high-strength gypsum cementing material.
Example 2
The high-strength gypsum cementing material of the embodiment comprises the following raw material components in parts by weight: 70 parts of high-strength gypsum, 10 parts of anhydrite and 20 parts of desulfurized beta powder; the anhydrite is the anhydrite in the bulls mining industry, and is ball-milled by adopting a planetary ball mill, the ball-milling time is 15min, and the specific surface area is 2974cm2(ii)/g; the proportioning raw materials are uniformly mixed to obtain the low-cost high-strength gypsum cementing material.
Example 3
The high-strength gypsum cementing material of the embodiment comprises the following raw material components in parts by weight: 70 parts of high-strength gypsum, 15 parts of anhydrite and 15 parts of desulfurized beta powder; the anhydrite is prepared by calcining Anhui copper tomb phosphogypsum for 3.5h at 800 ℃ and performing ball milling for 20min, and the specific surface area is 4653cm2(ii) in terms of/g. The proportioning raw materials are uniformly mixed to obtain the low-cost high-strength gypsum cementing material.
Example 4
The high-strength gypsum cementing material of the embodiment comprises the following raw material components in parts by weight: 65 parts of high-strength gypsum, 5 parts of anhydrite and 30 parts of desulfurized beta powder. The anhydrite is hard gypsum in the bulls mining industry, and is ball-milled by adopting a planetary ball mill, the ball-milling time is 3min, and the specific surface area is 1865cm2(ii) in terms of/g. The proportioning raw materials are uniformly mixed to obtain the low-cost high-strength gypsum cementing material.
Example 5
The high-strength gypsum cementing material of the embodiment comprises the following raw material components in parts by weight: 65 parts of high-strength gypsum, 10 parts of anhydrite and 25 parts of desulfurized beta powder. Anhydrite (Anhui Tongling phosphogypsum)Calcining at 850 deg.C for 3h, ball milling for 10min to obtain the final product with specific surface area of 2613cm2(ii) in terms of/g. The proportioning raw materials are uniformly mixed to obtain the low-cost high-strength gypsum cementing material.
Example 6
The high-strength gypsum cementing material of the embodiment comprises the following raw material components in parts by weight: 60 parts of high-strength gypsum, 10 parts of anhydrite and 30 parts of desulfurized beta powder, wherein the anhydrite (i) is natural anhydrite and is ball-milled by adopting a planetary ball mill, the ball-milling time is 30min, and the specific surface area is 4982cm2(ii) in terms of/g. The proportioning raw materials are uniformly mixed to obtain the low-cost high-strength gypsum cementing material.
The results of the performance tests on the high-strength gypsum-based binder obtained in the above examples are shown in the following table.
Figure BDA0002632394490000041
In conclusion, when 70 parts of the high-strength gypsum, 10 parts of the anhydrite and 20 parts of the desulfurized beta powder in the embodiment 2 are used, the rupture strength of 5.8MPa in 2 hours is high, and the performance is excellent; when 70 parts of high-strength gypsum, 15 parts of anhydrite and 15 parts of desulfurized beta powder are used in the embodiment 3 of the invention, the rupture strength of 2h reaches 5.7MPa, the compressive strength of 2h reaches 22.2MPa, the drying compressive strength reaches 48.3MPa, and all the different energies reach a certain height and are relatively uniform.
The high-strength gypsum cementing material prepared by the invention has mechanical properties meeting the conditions that the rupture strength is more than or equal to 5.0MPa for 2h and the drying compressive strength is more than or equal to 40.0MPa, relieves the stockpiling condition of natural anhydrite and industrial byproduct phosphogypsum to a great extent, and fully realizes the continuous utilization of resources.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. The high-strength gypsum cementing material based on anhydrite and desulfurized beta powder is characterized by comprising the following raw material components in parts by weight: 60-70 parts of high-strength gypsum, 5-35 parts of anhydrite and 5-35 parts of desulfurized beta powder.
2. The anhydrite and desulfurized beta powder-based high-strength gypsum cementing material according to claim 1, characterized by comprising the following raw material components in parts by weight: 70 parts of high-strength gypsum, 10 parts of anhydrite and 20 parts of desulfurized beta powder.
3. The anhydrite and desulfurized beta powder-based high-strength gypsum cementing material according to claim 1, characterized by comprising the following raw material components in parts by weight: 70 parts of high-strength gypsum, 15 parts of anhydrite and 15 parts of desulfurized beta powder.
4. The anhydrite and desulfurized beta powder-based high-strength gypsum cementing material according to claim 1, characterized in that the high-strength gypsum is alpha-type high-strength gypsum, and meets the requirements that the flexural strength is more than or equal to 6.0MPa within 2 hours and the drying compressive strength is more than or equal to 50.0 MPa.
5. The anhydrite and desulfurized beta meal-based high-strength gypsum cementitious material according to claim 1, characterized in that the anhydrite is natural anhydrite or commercially available anhydrite.
6. A preparation method of a high-strength gypsum cementing material based on anhydrite and desulfurized beta powder is characterized by comprising the following steps:
s1, selecting high-strength gypsum: selecting high-strength gypsum powder, and meeting the requirements that the breaking strength is more than or equal to 6.0Mpa after 2 hours and the drying compressive strength is more than or equal to 50.0 Mpa;
s2, grinding anhydrite: carrying out ball milling on the anhydrite by adopting a planetary ball mill to ensure that the specific surface area is 1170-7000 cm2/g；
S3, mixing materials: and (3) uniformly mixing and stirring the high-strength gypsum powder, the ground anhydrite powder and the desulfurization beta powder to obtain the high-strength gypsum cementing material based on the anhydrite and the desulfurization beta powder.
7. The method for preparing the anhydrite and desulfurized beta powder-based high-strength gypsum cementing material according to the claim 6, wherein the high-strength gypsum powder in the step S1 is alpha type high-strength gypsum powder.
8. The method for preparing the anhydrite and desulfurized beta powder-based high-strength gypsum cementing material according to the claim 6, wherein in the step S2, the grinding time of the anhydrite is 0.1-2 h.
CN202010815101.XA 2020-08-13 2020-08-13 High-strength gypsum cementing material based on anhydrite and desulfurized beta powder and preparation method thereof Pending CN111875273A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1076678A (en) * 1993-03-20 1993-09-29 东南大学 Keene's cement
AU2429099A (en) * 1997-08-27 2000-08-29 Societe Europeenne D'exploitation De Technologies Industrielles Method for producing an anhydrite iii or alpha based hydraulic bonding agent
CN106006695A (en) * 2016-05-12 2016-10-12 贵州开磷磷石膏综合利用有限公司 Preparation method of high-strength composite gypsum micropowder
EP3208248A1 (en) * 2014-10-13 2017-08-23 Stavrulov, Igor Anatolevich Method for producing a gypsum binder
CN109180131A (en) * 2018-11-22 2019-01-11 贵州大学 A kind of preparation method of gypsum based self-leveling mortar

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1076678A (en) * 1993-03-20 1993-09-29 东南大学 Keene's cement
AU2429099A (en) * 1997-08-27 2000-08-29 Societe Europeenne D'exploitation De Technologies Industrielles Method for producing an anhydrite iii or alpha based hydraulic bonding agent
EP3208248A1 (en) * 2014-10-13 2017-08-23 Stavrulov, Igor Anatolevich Method for producing a gypsum binder
CN106006695A (en) * 2016-05-12 2016-10-12 贵州开磷磷石膏综合利用有限公司 Preparation method of high-strength composite gypsum micropowder
CN109180131A (en) * 2018-11-22 2019-01-11 贵州大学 A kind of preparation method of gypsum based self-leveling mortar

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